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Anisotropic shearing mechanism of Kangding slate:Experimental investigation and numerical analysis
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作者 Ping Liu Quansheng Liu +4 位作者 Penghai Deng Yucong Pan Yiming Lei Chenglei Du Xianqi Xie 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第5期1487-1504,共18页
The shear mechanical behavior is regarded as an essential factor affecting the stability of the surrounding rocks in underground engineering.The shear strength and failure mechanisms of layered rock are significantly ... The shear mechanical behavior is regarded as an essential factor affecting the stability of the surrounding rocks in underground engineering.The shear strength and failure mechanisms of layered rock are significantly affected by the foliation angles.Direct shear tests were conducted on cubic slate samples with foliation angles of 0°,30°,45°,60°,and 90°.The effect of foliation angles on failure patterns,acoustic emission(AE)characteristics,and shear strength parameters was analyzed.Based on AE characteristics,the slate failure process could be divided into four stages:quiet period,step-like increasing period,dramatic increasing period,and remission period.A new empirical expression of cohesion for layered rock was proposed,which was compared with linear and sinusoidal cohesion expressions based on the results made by this paper and previous experiments.The comparative analysis demonstrated that the new expression has better prediction ability than other expressions.The proposed empirical equation was used for direct shear simulations with the combined finite-discrete element method(FDEM),and it was found to align well with the experimental results.Considering both computational efficiency and accuracy,it was recommended to use a shear rate of 0.01 m/s for FDEM to carry out direct shear simulations.To balance the relationship between the number of elements and the simulation results in the direct shear simulations,the recommended element size is 1 mm. 展开更多
关键词 ANISOTROPY Empirical expression of cohesion foliation angles Combined finite-discrete element method(FDEM) shear rate element size
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Protective performance of shear stiffening gel-modified foam against ballistic impact:Experimental and numerical study
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作者 Huan Tu Haowei Yang +9 位作者 Pengzhao Xu Zhe Yang Fan Tang Cheng Dong Yuchao Chen Lei Ren Wenjian Cao Chenguang Huang Yacong Guo Yanpeng Wei 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第2期510-520,共11页
As one of the most widely used personal protective equipment(PPE),body armors play an important role in protecting the human body from the high-velocity impact of bullets or projectiles.The body torso and critical org... As one of the most widely used personal protective equipment(PPE),body armors play an important role in protecting the human body from the high-velocity impact of bullets or projectiles.The body torso and critical organs of the wear may suffer severe behind-armor blunt trauma(BABT)even though the impactor is stopped by the body armor.A type of novel composite material through incorporating shear stiffening gel(STG)into ethylene-vinyl acetate(EVA)foam is developed and used as buffer layers to reduce BABT.In this paper,the protective performance of body armors composed of fabric bulletproof layers and a buffer layer made of foam material is investigated both experimentally and numerically.The effectiveness of STG-modified EVA in damage relief is verified by ballistic tests.In parallel with the experimental study,numerical simulations are conducted by LS-DYNA®to investigate the dynamic response of each component and capture the key mechanical parameters,which are hardly obtained from field tests.To fully describe the material behavior under the transient impact,the selected constitutive models take the failure and strain rate effect into consideration.A good agreement between the experimental observations and numerical results is achieved to prove the validity of the modelling method.The tests and simulations show that the impact-induced deformation on the human body is significantly reduced by using STG-modified EVA as the buffering material.The improvement of protective performance is attributed to better dynamic properties and more outstanding energy absorption capability of the composite foam. 展开更多
关键词 Ballistic behavior Composite foam shear stiffening gel Finite element analysis Protective mechanism
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A Comprehensive Investigation on Shear Performance of Improved Perfobond Connector
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作者 Caiping Huang Zihan Huang Wenfeng You 《Structural Durability & Health Monitoring》 EI 2024年第3期299-320,共22页
This paper presents an easily installed improved perfobond connector (PBL) designed to reduce the shearconcentration of PBL. The improvement of PBL lies in changing the straight penetrating rebar to the Z-typepenetrat... This paper presents an easily installed improved perfobond connector (PBL) designed to reduce the shearconcentration of PBL. The improvement of PBL lies in changing the straight penetrating rebar to the Z-typepenetrating rebar. To study the shear performance of improved PBL, two PBL test specimens which containstraight penetrating rebar and six improved PBL test specimens which contain Z-type penetrating rebars weredesigned and fabricated, and push-out tests of these eight test specimens were carried out to investigate andcompare the shear behavior of PBL. Additionally, Finite Element Analysis (FEA) models of the PBL specimenswere established and validated against the test results. Through FEA, the effects of concrete grade, perforatedplate’s aperture, Z-type penetrating rebar’s diameter, Z-type penetrating rebar’s bending angle, and bending lengthon shear behaviors were discussed. The results indicate that (1) Compared with PBL specimens with straightpenetrating rebars, Z-type penetrating rebar can significantly improve the shear resistance and shear stiffnessof the specimens. This enhanced performance can be mainly attributed to the increased adhesion of the transverserebar. (2) By comparing the load-slip curve, the slip of PBL test specimens which contain straight penetratingrebar increases rapidly and the bearing capacity decreases rapidly after concrete craking, while the bearingcapacity of Z-type penetrating rebar specimens decreases first and then increases gradually, showing betterductility. (3) The stress of the PBL shear connector with Z-type penetrating rebar is more uniform than thePBL shear connector with straight penetrating rebar, and the overall deformation is more uniform. (4) The higherthe concrete grade, the higher the shear bearing capacity and the better ductility of the new PBL. Increasing theaperture of the perforated plate or the diameter of the rebar has a very limited effect on the improvement of theshear capacity of PBL. Through the systematic analysis of the mechanical properties of Z-type penetrating rebarPBL specimen, the experimental reference is provided for improving the structure and design of new type PBL. 展开更多
关键词 PBL penetrating rebar push-out test load-slip curve shear capacity finite element analysis
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Shear properties of thawed natural permafrost by bender elements 被引量:2
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作者 Feng Zhang ZhaoHui (Joey) Yang +2 位作者 JiaHui Wang HaiPeng Li Benjamin Still 《Research in Cold and Arid Regions》 CSCD 2017年第4期343-351,共9页
Thawed permafrost could cause a serious stability problem for foundations and oil-wells in cold regions. A non-damage testing procedure, employing the Bender Element Method, was used for permafrost samples collected f... Thawed permafrost could cause a serious stability problem for foundations and oil-wells in cold regions. A non-damage testing procedure, employing the Bender Element Method, was used for permafrost samples collected from a continuous frozen core obtained from the North Slope of Alaska, USA. The wave velocity and modulus of thawed permafrost were investigated on various isotropic confining pressure from 0 kPa to 400 kPa per 100 kPa. The received shear wave propagation was recorded, and the elastic wave theory was used to calculate shear modulus. Finally, the shear modulus affected by confining pressure, water content and dry density were analyzed and discussed, and a regression formulation of shear modulus based on the Janbu Model for thawed silty and sandy permafrost were proposed and validation. 展开更多
关键词 shear VELOCITY shear MODULUS thawed NATURAL PERMAFROST bender element
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A new higher-order shear deformation theory and refined beam element of composite laminates 被引量:3
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作者 WanjiChen ZhenWu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2005年第1期65-69,共5页
A new higher-order shear deformation theory based on global-local superposition technique is developed. The theory satisfies the free surface conditions and the geometric and stress continuity conditions at interfaces... A new higher-order shear deformation theory based on global-local superposition technique is developed. The theory satisfies the free surface conditions and the geometric and stress continuity conditions at interfaces. The global displacement components are of the Reddy theory and local components are of the internal first to third-order terms in each layer. A two-node beam element based on this theory is proposed. The solutions are compared with 3D-elasticity solutions. Numerical results show that present beam element has higher computational efficiency and higher accuracy. 展开更多
关键词 Laminated composite beam Higher-order shear deformation theory Refined beam element
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A MODIFIED METHOD IN FINITE ELEMENT ANALYSIS WITH APPLICATION TO SIMPLE SHEARING 被引量:2
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作者 Song Suncheng (Inner Mongolia Research Institute of Metals,014030,China)Huang Chenguang Duan Zhuping (LNM,Institute of Mechanics,Chinese Academy of Sciences,100080,China) 《Acta Mechanica Solida Sinica》 SCIE EI 1994年第4期285-291,共7页
A modified technique called compatible stress iterative procedure is proposed in finite element analysis,which has well improved the conventional weighted-residual method and was successful in dealing with the formati... A modified technique called compatible stress iterative procedure is proposed in finite element analysis,which has well improved the conventional weighted-residual method and was successful in dealing with the formation and localization process of shear banding. 展开更多
关键词 shear banding finite element analysis stress compatibility
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Finite element investigation of steel built-up shear links subjected to inelastic deformations 被引量:1
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作者 Peter Dusicka Ahmad M.Itani Ian G.Buckle 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2004年第2期195-203,共9页
Non-linear finite element models accounting for large displacements have been used to investigate the behavior of steel built-up shear links that had previously been tested using large-scale experiments. The links wer... Non-linear finite element models accounting for large displacements have been used to investigate the behavior of steel built-up shear links that had previously been tested using large-scale experiments. The links were designed using steel grades with yield points ranging from high to low strengths. The objectives of the numerical analyses were to further investigate the non-linear behavior and to correlate the numerical results with experimental observations. Elasto-plastic as well as cyclic stress-strain material properties were incorporated to study the influence of material behavior on the overall shear link response. Non-linear monotonie analyses of the shear links incorporating the cyclic stress-strain steel properties resulted in similar trends in the response as the backbone curves recorded from the physical experiments. The numerical models of built-up shear links utilizing structural grade steels closely correlated to the experimentally recorded shear strength. Models utilizing low yield point steels overestimated the shear strength, which was caused by the characteristics of cyclic behavior of those steels. The detailed numerical models also allowed for investigation of the plastic strain demands on the different components of the link. It was shown that finite element models combined with appropriate stress-strain relationship may be used with confidence to check the design of shear links of different steel grades and sectional geometries. 展开更多
关键词 finite element investigation steel built-up shear link inelastic deformation
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Mesomechanical simulation of direct shear test on outwash deposits with granular discrete element method 被引量:6
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作者 石崇 王盛年 +2 位作者 刘琳 孟庆祥 张强 《Journal of Central South University》 SCIE EI CAS 2013年第4期1094-1102,共9页
The mechanical properties of outwash deposits which are taken as unconsolidated geo-materials with the characteristics of non-uniformity, heterogeneity and multiphase have attracted much attention in engineering. Acco... The mechanical properties of outwash deposits which are taken as unconsolidated geo-materials with the characteristics of non-uniformity, heterogeneity and multiphase have attracted much attention in engineering. According to the results of laboratory direct shear test on the remolded samples, the soil particle parameters of numerical model based on in-situ particle size cumulative curves and 3D granular discrete element method were determined. Then, numerical experiments on different lithology, stone content and gradation composition were conducted. The results show that it is not a flat surface but a shear band that yields in the sample. The curve of particle velocity vs distance from the designed shear surface of test model that is taken as a datum plane in the vertical section of sample shows in "S" shape. The shear disturbance area is about twice the maximum diameter of stone blocks. The greater the stiffness of stone is, the rougher the shear surface is. The shear strength of outwash deposits is largely controlled by lithology and stone content, and the bite force between stone blocks is the root reason of larger friction angle. It is also shown that strain hardening and low shear dilatancy occur under high confining pressure as well as possibility of shear shrinkage. But it is easy to behave shear dilatation and strain softening under low confining pressure. The relationship between particle frictional coefficient and stone content presents an approximately quadratic parabola increase. The strain energy first increases and then drops with the increase of frictional energy. The cohesion increases with soil stiffness increasing but decreases with stone stiffness increasing. Numerical results are consistent with the laboratory test results of remolded samples, which indicate that this method can be a beneficial supplement to determine the parameters of engineering deposit bodies. 展开更多
关键词 土壤颗粒 直剪试验 冰水沉积 离散元方法 力学模拟 实验室测试 细观 累积曲线
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A fiber-section model based Timoshenko beam element using shear-bending interdependent shape function 被引量:3
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作者 Li Ning Li Zhongxian Xie Lili 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2013年第3期421-432,共12页
A fiber-section model based Timoshenko beam element is proposed in this study that is founded on the nonlinear analysis of frame elements considering axial, flexural, and shear deformations. This model is achieved usi... A fiber-section model based Timoshenko beam element is proposed in this study that is founded on the nonlinear analysis of frame elements considering axial, flexural, and shear deformations. This model is achieved using a shear-bending interdependent formulation (SBIF). The shape function of the element is derived from the exact solution of the homogeneous form of the equilibrium equation for the Timoshenko deformation hypothesis.The proposed element is free from shear-locking. The sectional fiber model is constituted with a multi-axial plasticity material model, which is used to simulate the coupled shear-axial nonlinear behavior of each fiber. By imposing deformation compatibility conditions among the fibers, the sectional and elemental resisting forces are calculated. Since the SBIF shape functions are interactive with the shear-corrector factor for different shapes of sections, an iterative procedure is introduced in the nonlinear state determination of the proposed Timoshenko element. In addition, the proposed model tackles the geometric nonlinear problem by adopting a corotational coordinate transformation approach. The derivation procedure of the corotational algorithm of the SBIF Timoshenko element for nonlinear geometrical analysis is presented. Numerical examples confirm that the SBIF Timoshenko element with a fiber-section model has the same accuracy and robustness as the flexibility-based formulation. Finally, the SBIF Timoshenko element is extended and demonstratedin a three-dimensional numerical example. 展开更多
关键词 Timoshenko beam shear-flexure coupled effect shear-bending interdependent formulation nonlineargeometric analysis finite element
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Experimental research and finite element analysis of bridge piers failed in flexure-shear modes 被引量:6
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作者 Sun Zhiguo Si Bingjun +1 位作者 Wang Dongsheng Guo Xun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2008年第4期403-414,共12页
In recent earthquakes, a large number of reinforced concrete (RC) bridges were severely damaged due to mixed flexure-shear failure modes of the bridge piers. An integrated experimental and finite element (FE) anal... In recent earthquakes, a large number of reinforced concrete (RC) bridges were severely damaged due to mixed flexure-shear failure modes of the bridge piers. An integrated experimental and finite element (FE) analysis study is described in this paper to study the seismic performance of the bridge piers that failed in flexure-shear modes. In the first part, a nonlinear cyclic loading test on six RC bridge piers with circular cross sections is carried out experimentally. The damage states, ductility and energy dissipation parameters, stiffness degradation and shear strength of the piers are studied and compared with each other. The experimental results suggest that all the piers exhibit stable flexural response at displacement ductilities up to four before exhibiting brittle shear failure. The ultimate performance of the piers is dominated by shear capacity due to significant shear cracking, and in some cases, rupturing of spiral bars. In the second part, modeling approaches describing the hysteretic behavior of the piers are investigated by using ANSYS software. A set of models with different parameters is selected and evaluated through comparison with experimental results. The influences of the shear retention coefficients between concrete cracks, the Bauschinger effect in longitudinal reinforcement, the bond-slip relationship between the longitudinal reinforcement and the concrete and the concrete failure surface on the simulated hysteretic curves are discussed. Then, a modified analysis model is presented and its accuracy is verified by comparing the simulated results with experimental ones. This research uses models available in commercial FE codes and is intended for researchers and engineers interested in using ANSYS software to predict the hysteretic behavior of reinforced concrete structures. 展开更多
关键词 RC bridge piers flexure-shear failure seismic behavior finite element ANSYS software
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New Finite Elements in Shear Stress Analysis of Saint Venant′s Torsional Loaded Beam Structures
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作者 J. Brnic G. Turkalj 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第z1期151-153,共3页
Recent engineering design as well as material processing on the optimization procedure are based and computeroriented. Finite element stress and sensitivity analysis are the most important things in such modern determ... Recent engineering design as well as material processing on the optimization procedure are based and computeroriented. Finite element stress and sensitivity analysis are the most important things in such modern determinationof optimal solution. According to high computer capacity finite element continuum discretization and load applicationindependent of the coming fields become unlimited. This paper deals with the development of a new finite elementsgeneration used in shear stress analysis caused by S.Venant′s torsional load and bending with shear. Their stiffnessmatrices and load vectors on the basis of their geometrical properties are derived. For justification of new finiteelements application some examples are presented. 展开更多
关键词 NEW FINITE elements shear stress analysis Optimal design
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Distinct element method investigation on mechanical behavior within shear bands in granulates under the Earth and the Moon conditions
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作者 Mingjing Jiang Wangcheng Zhang 《Theoretical & Applied Mechanics Letters》 CAS 2013年第2期25-29,共5页
This letter mainly aims to investigate the mechanical behavior within shear bands in regolith both under the Earth and the Moon conditions via the distinct element method, in which a novel contact model considering in... This letter mainly aims to investigate the mechanical behavior within shear bands in regolith both under the Earth and the Moon conditions via the distinct element method, in which a novel contact model considering interparticle van der Waals forces and rolling resistance is employed. The results show that for regolith under both conditions the stress paths are almost identical inside and outside the shear bands but void ratio, average pure rotation rate, and strain paths are rather distinct with dilation, particle rotation and the second invariant of strain tensor mainly occurring within the bands. However, the regolith under the Moon condition has higher peak strength and more significant strain localization than those under the Earth condition. 展开更多
关键词 lunar regolith shear band van der Waals forces MICROMECHANICS distinct element method
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Surface-mounted bender elements for measuring horizontal shear wave velocity of soils 被引量:1
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作者 Yan-guo ZHOU Yun-min CHEN +1 位作者 Yoshiharu ASAKA Tohru ABE 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第11期1490-1496,共7页
The bender element testing features its in-plane directivity, which allows using bender elements to measure the shear wave velocities in a wider range of in-plane configurations besides the standard tip-to-tip alignme... The bender element testing features its in-plane directivity, which allows using bender elements to measure the shear wave velocities in a wider range of in-plane configurations besides the standard tip-to-tip alignment. This paper proposed a novel bender element testing technique for measuring the horizontal shear wave velocity of soils, where the bender elements are surface- mounted and the axes of the source and receiver elements are parallel to each other. The preliminary tests performed on model ground of silica sand showed that, by properly determining the travel distance and time of the shear waves, the surface-mounted bender elements can perform as accurately as the conventional "tip-to-tip" configuration. Potentially, the present system provides a promising nondestructive tool for characterizing geomaterials and site conditions both in laboratory and in the fields. 展开更多
关键词 弯曲度 剪切波速度 非破坏性评估 沙地
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Mesomechanics Finite-element Method for Determining the Shear Strength of Mudded Intercalation Materials 被引量:2
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作者 胡启军 SHI Rendan +3 位作者 YANG Xiaoqiang CAI Qijie HE Tianjun HE Leping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期289-291,共3页
A new method regarding mesomechanics finite-element research is proposed to predict the peak shear strength of mudded intercalation materials on a mesoscopic scale. Based on geometric and mechanical parameters, along ... A new method regarding mesomechanics finite-element research is proposed to predict the peak shear strength of mudded intercalation materials on a mesoscopic scale. Based on geometric and mechanical parameters, along with the strain failure criteria obtained by sample's deformation characteristics, uniaxial compression tests on the sample were simulated through a finite-element model, which yielded values consistent with the data from the laboratory uniaxial compression tests, implying that the method is reasonable. Based on this model, a shear test was performed to calculate the peak shear strength of the mudded intercalation, consistent with values reported in the literature, thereby providing a new approach for investigating the mechanical properties of mudded intercalation materials. 展开更多
关键词 mudded intercalation mesomechanics finite-element method mesoscale structure shear strength
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BOP shear force evaluation under complex scenarios
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作者 Feng-Li Zhang Jin-Tao Ni +2 位作者 Lai-Bin Zhang Yong-Sheng Chen Jin-Jiang Wang 《Petroleum Science》 SCIE EI CAS CSCD 2023年第4期2442-2451,共10页
As the“throat”of the drilling well control system,ram blowout preventers(BOPs)can effectively prevent blowout accidents.However,the ram shear mechanism under complex working conditions is unclear,and it is difficult... As the“throat”of the drilling well control system,ram blowout preventers(BOPs)can effectively prevent blowout accidents.However,the ram shear mechanism under complex working conditions is unclear,and it is difficult to evaluate the ram BOP shear force,leading to frequent shear failure accidents in oilfields.Aiming at the above problems,this paper takes the double-V ram BOP as the research object,and integrates the methods of theoretical analysis,simulation modeling,and test verification to analyze the shear force in the pipe shear process under both static and moving conditions.A ram BOP shear force evaluation method is proposed based on equivalent stress.Finally,by comparing with calculation data and experimental data,the error between them is less than 5%,demonstrating the applicability and effectiveness of the proposed method.The research results can provide a theoretical basis for oilfield operations of ram BOPs. 展开更多
关键词 Double-V ram Blowout preventer shear force assessment Moving state shearing Finite element analysis shear test under pressure
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Correlation of liquefaction resistance with shear wave velocity based on laboratory study using bender element
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作者 周燕国 陈云敏 柯瀚 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第8期805-812,共8页
Recent studies using field case history data yielded new criteria for evaluating liquefaction potential in saturated granular deposits based on in situ, stress-corrected shear wave velocity. However, the conditions of... Recent studies using field case history data yielded new criteria for evaluating liquefaction potential in saturated granular deposits based on in situ, stress-corrected shear wave velocity. However, the conditions of relatively insufficient case histories and limited site conditions in this approach call for additional data to more reliably define liquefaction resistance as a function of shear wave velocity. In this study, a series of undrained cyclic triaxial tests were conducted on saturated sand with shear wave velocity Vs measured by bender element. By normalizing the data with respect to minimum void ratio, the test results, in-corporated with previously published laboratory data, statistically revealed good correlation of cyclic shear strength with small-strain shear modulus for sandy soils, which is almost irrespective of soil types and confining pressures. The consequently determined cyclic resistance ratio, CRR, was found to be approximately proportional to Vs4. Liquefaction resistance boundary curves were established by applying this relationship and compared to liquefaction criteria derived from seismic field measure-ments. Although in the range of Vs1>200 m/s the presented curves are moderately conservative, they are remarkably consistent with the published field performance criteria on the whole. 展开更多
关键词 液化阻抗 煎切波速率 弯曲要素 沙土 地震场
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钢筋混凝土板柱节点冲切性能研究进展 被引量:1
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作者 郑山锁 杜宜阳 +1 位作者 梁泽田 宋枳含 《建筑科学与工程学报》 北大核心 2024年第1期52-68,共17页
为提高板柱节点冲切性能从而促进其工程应用,比较了各类抗冲切元件的不同布置形式、形状尺寸、几何参数以及组合形式对节点抗冲切承载力的影响,概括了受损板柱节点修复与加固的研究现状,梳理了不同开洞尺寸、距离、数量、形状及偏心荷... 为提高板柱节点冲切性能从而促进其工程应用,比较了各类抗冲切元件的不同布置形式、形状尺寸、几何参数以及组合形式对节点抗冲切承载力的影响,概括了受损板柱节点修复与加固的研究现状,梳理了不同开洞尺寸、距离、数量、形状及偏心荷载作用下开洞板柱试件抗冲切性能的研究成果,归纳了有无抗冲切钢筋和配置型钢剪力架板柱节点的抗冲切承载力计算方法以及基于机器学习的板柱节点冲切承载力预测方法。结果表明:各类抗冲切元件可通过改变布置形式、形状尺寸、几何参数以及元件组合从而改善板柱节点的冲切性能;板件开洞的尺寸越大、距离越远、数量越多,对节点的抗冲切性能越不利;基于数值模拟和规范改进得出的冲切承载力计算公式仅对特定试验有较高的预测精度,尚未形成较为统一的承载力计算公式,而基于机器学习的冲切承载力预测模型是未来研究的重点;需进一步开展关于受损板柱节点修复与加固方法的研究,对完善板柱节点抗冲切性能研究理论体系具有重要意义。 展开更多
关键词 板柱节点 抗冲切元件 抗冲切承载力 预测模型 开洞板柱试件 机器学习
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不同锈蚀程度下栓钉连接件的抗剪性能分析
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作者 王亮 魏欢博 +2 位作者 高亚杰 任万敏 卫星 《深圳大学学报(理工版)》 CSCD 北大核心 2024年第1期58-65,共8页
为研究栓钉连接件锈蚀条件下的抗剪性能退化规律,建立ABAQUS有限元模型进行数值模拟.针对均匀圆环、受压区半环、受拉区半环及拉压区半环4种不同的锈蚀分布形态,考虑不同的锈蚀高度、锈蚀深度进行数值分析.结果表明,当锈蚀深度相同时,4... 为研究栓钉连接件锈蚀条件下的抗剪性能退化规律,建立ABAQUS有限元模型进行数值模拟.针对均匀圆环、受压区半环、受拉区半环及拉压区半环4种不同的锈蚀分布形态,考虑不同的锈蚀高度、锈蚀深度进行数值分析.结果表明,当锈蚀深度相同时,4种锈蚀分布形态的栓钉抗剪承载力随锈蚀高度的增加而降低,在锈蚀高度为10 mm时降到最小,且锈蚀深度越大,承载力降低程度也越大;当锈蚀高度相同时,随着锈蚀深度的增加,抗剪承载力和抗剪刚度基本上呈线性下降趋势;当锈蚀高度和深度相同时,均匀圆环锈蚀的抗剪承载力和刚度的降低程度最大,相比其他3种情况降低60%左右,受压区半环锈蚀的抗剪承载力和刚度的降低程度最小.研究成果可为钢混组合结构栓钉连接件耐久性设计提供参考. 展开更多
关键词 桥梁工程 栓钉连接件 锈蚀 抗剪承载力 抗剪刚度 有限元分析
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新型预应力混凝土钢管桁架叠合梁抗剪性能有限元分析 被引量:1
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作者 周广强 付祥峰 《建筑技术》 2024年第5期575-578,共4页
为解决施工现场中现有装配式混凝土叠合梁、梁柱结点钢筋相互影响的问题,设计一种新型预应力混凝土钢管桁架叠合梁。为进一步研究该叠合梁的抗剪性能,共设计6个叠合梁、3个整浇梁进行ABAQUS有限元模拟,分析其破坏特征机理、荷载–跨中... 为解决施工现场中现有装配式混凝土叠合梁、梁柱结点钢筋相互影响的问题,设计一种新型预应力混凝土钢管桁架叠合梁。为进一步研究该叠合梁的抗剪性能,共设计6个叠合梁、3个整浇梁进行ABAQUS有限元模拟,分析其破坏特征机理、荷载–跨中挠度曲线等,研究试件剪跨比、底板厚度参数对抗剪性能的影响,以及新型预应力混凝土钢管桁架叠合梁与整浇梁的抗剪性能对比。数值模拟分析结果显示,新型叠合梁与整浇梁均为剪切破坏,在底板厚度相同的情况下,随着剪跨比的增大,叠合梁的极限承载力略微降低。此外,预制高度增加会导致叠合梁的极限承载力减小。叠合梁表现出与整浇梁相似的受剪性能,随着剪跨比增加,叠合梁相对于整浇梁表现出更好的抗剪性能。综合而言,新型预应力混凝土钢管桁架叠合梁具有良好的抗剪性能。 展开更多
关键词 叠合梁 预应力 抗剪性能 有限元分析
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装配式槽钢组合梁中开孔钢板连接件力学性能
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作者 周凌宇 范进凯 +5 位作者 方蛟鹏 李分规 戴超虎 曾波 徐增武 刘晓春 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2024年第2期58-67,共10页
为研究新型装配式双拼槽钢-混凝土组合梁中开孔钢板剪力连接件(PSP剪力连接件)的力学性能,设计7组标准试件并开展推出试验,对比分析不同参数PSP剪力连接件的受剪承载力和破坏模式。利用ABAQUS非线性有限元模型对PSP剪力连接件的破坏模... 为研究新型装配式双拼槽钢-混凝土组合梁中开孔钢板剪力连接件(PSP剪力连接件)的力学性能,设计7组标准试件并开展推出试验,对比分析不同参数PSP剪力连接件的受剪承载力和破坏模式。利用ABAQUS非线性有限元模型对PSP剪力连接件的破坏模式和受力机制进行数值模拟,并与试验结果对比验证计算结果的可靠性。在此基础上,进一步分析开孔钢板厚度、开孔直径、混凝土强度、穿孔钢筋及连接件间距对PSP剪力连接件力学性能的影响。结果表明:除10 mm厚度的PSP剪力连接件外,所有4 mm与6 mm厚度的PSP剪力连接件均发生明显弯曲变形,试件破坏时连接件周围混凝土均出现斜向裂缝;开孔直径和穿孔钢筋对受剪承载力和抗剪刚度影响较小,而增加开孔钢板厚度、混凝土强度能提高剪力连接件受剪承载力和抗剪刚度;对于双排PSP剪力连接件,增大连接件间距能够显著提高单排PSP剪力连接件平均承载力,当间距为250 mm时,单排平均承载力达到单个PSP剪力连接件的91.2%。根据试验及有限元荷载滑移曲线提出装配式双拼槽钢-混凝土组合梁中单个PSP连接件荷载滑移曲线计算公式,为装配式双拼槽钢混组合梁的设计提供参考。 展开更多
关键词 装配式组合梁 开孔钢板剪力连接件 受剪承载力 推出试验 有限元 荷载-滑移曲线
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