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Application of bi-directional static loading test to deep foundations 被引量:4
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作者 Guoliang Dai Weiming Gong 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE 2012年第3期269-275,共7页
Bi-directional static loading test adopting load cells is widely used around the world at present, with increase in diameter and length of deep foundations. In this paper, a new simple conversion method to predict the... Bi-directional static loading test adopting load cells is widely used around the world at present, with increase in diameter and length of deep foundations. In this paper, a new simple conversion method to predict the equivalent pile head load-settlement curve considering elastic shortening of deep foundation was put forward according to the load transfer mechanism. The proposed conversion method was applied to root caisson foundation in a bridge and to large diameter pipe piles in a sea wind power plant. Some new load cells, test procedure, and construction technology were adopted based on the applications to different deep foundations, which could enlarge the application scopes of bi-directional loading test. A new type of bi-directional loading test for pipe pile was conducted, in which the load cell was installed and loaded after the pipe pile with special connector has been set up. Unlike the conventional bi-directional loading test, the load cell can be reused and shows an evident economic benefit. 展开更多
关键词 deep foundations bi-directional static loading test root caisson foundation large diameter pipe pile
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Analysis of the Application of Static Load Test in Bridge Bearing Capacity Testing
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作者 Wei Fu Bo Liu 《Journal of Architectural Research and Development》 2024年第3期36-41,共6页
This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing capacity.The analysis covers aspects such as testing section layout,test load... This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing capacity.The analysis covers aspects such as testing section layout,test load and efficiency coefficient,loading plan,evaluation optimization,test result modification,and result evaluation.The aim is to support the accurate detection and evaluation of bridge-bearing capacity. 展开更多
关键词 Bridge engineering Bearing capacity static load test loading plan test evaluation
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Static load test and load transfer mechanism study of squeezed branch and plate pile in collapsible loess foundation 被引量:8
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作者 GAO Xiao-juan WANG Jin-chang ZHU Xiang-rong 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第7期1110-1117,共8页
As a special geological phenomenon, the character of collapsible loess foundation is collapsible when penetrated by water. This character leads to the soil losing load bearing capacity largely and may lead to foundati... As a special geological phenomenon, the character of collapsible loess foundation is collapsible when penetrated by water. This character leads to the soil losing load bearing capacity largely and may lead to foundation failure. Pile is a popular foundation used in collapsible loess. The squeezed branch and plate pile is a new type of pile developed in recent years and has not be used in a project before. In this paper three squeezed branch and plate piles are tested in collapsible loess after immersion processing. The results may be used for reference in similar construction project, and to provide theoretical references for de- signing of the squeezed branch and plate piles in engineering practice. 展开更多
关键词 Collapsible loess foundation Squeezed branch and plate pile Immersion processing Full-scale static load test
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Technical Analysis of Highway Bridge Static Load Test 被引量:1
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作者 Ke Tu Yingying Ye +2 位作者 Daqing Wu Yunyong Zhou Wenming Deng 《Journal of Architectural Research and Development》 2023年第3期58-63,共6页
Highway bridges are an important part of the transportation industry and can promote social economic construction and development.In actual operation,highway bridges are often damaged due to overload and natural facto... Highway bridges are an important part of the transportation industry and can promote social economic construction and development.In actual operation,highway bridges are often damaged due to overload and natural factors,which tend to affect the safety and shorten the service life of these bridges.Assessing the overall state and performance of highway bridges is therefore a key element.Static load test,which is a type of sustainable detection experiment,has many advantages,including low cost,high efficiency,and high accuracy.In this paper,the bridge structure is analyzed through the application of theoretical calculations and relevant comparisons,so as to judge the operating state of the bridge. 展开更多
关键词 Highway bridge static load test Detection technology
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Effects of Microstructure on Quasi⁃Static Transverse Loading Behavior of 3D Circular Braided Composite Tubes
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作者 ZHOU Haili LI Chao +3 位作者 HAN Chenchen LIU Zhiyan ZHOU Feng ZHANG Liquan 《Journal of Donghua University(English Edition)》 CAS 2021年第5期392-397,共6页
The effects of microstructure on quasi-static transverse loading behavior of 3D circular braided composite tubes were studied. Transverse loading tests were conducted. Transverse load-deflection curves were obtained t... The effects of microstructure on quasi-static transverse loading behavior of 3D circular braided composite tubes were studied. Transverse loading tests were conducted. Transverse load-deflection curves were obtained to analyze the effects of braiding parameters including the braiding angle, the wall thickness, and the diameter on the transverse loading of 3D circular braided composite tubes. Breaking loads, moduli and strengths had also been used to describe the transverse loading behaviors. The failure morphologies were shown to reveal damage mechanisms. From the results, the increase in braiding angle, wall thickness and diameter increases the ability of anti-deformation and breaking load of braided tubes. The breaking load of specimen with a braiding angle of 45° is about 1.68 times that of specimen with a braiding angle of 15°. The breaking load of specimen with 4 layers of yarns is about 2.15 times that of specimen with 2 layers of yarns. The breaking load of the tube with a diameter of 25.5 mm is about 2.39 times that of the tube with a diameter of 20.5 mm. 展开更多
关键词 3D circular braided composite tube quasi⁃static transverse loading test braiding parameter failure morphology
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Static Load Test Detection of Continuous Rigid- Frame Railway Bridge
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作者 Jing Cao Lei An 《Journal of Architectural Research and Development》 2023年第5期1-7,共7页
The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for br... The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for bridge inspection.This article summarizes the purpose of the static load test for a continuous rigid-frame railway bridge,including the required equipment,operation methods,etc.,and lists examples to analyze the operation process and precautions of static load test,hoping to provide reference information for relevant personnel. 展开更多
关键词 Railway bridge Rigid-frame static load test
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NMR-based damage characterisation of backfill material in host rock under dynamic loading 被引量:22
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作者 Binglei Li Jiquan Lan +2 位作者 Guangyao Si Guopeng Lin Liuqing Hu 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2020年第3期329-335,共7页
It is not uncommon that backfill material used in underground mining being exposed to repetitive dynamic stresses induced by blasting operations or rockburst events. Understanding the strength and fracture evolution o... It is not uncommon that backfill material used in underground mining being exposed to repetitive dynamic stresses induced by blasting operations or rockburst events. Understanding the strength and fracture evolution of backfilled stopes is critical to maintain the long-term stope stability and ensure safe mining activities. This paper aims to study the damage evolution of the backfill material and its host rock behaviour under three-dimensional(3D) dynamic loading. Using a true-triaxial testing machine, multiple samples of backfill material enclosed by country rock were fabricated and tested under various dynamic loadings with different true-triaxial confining stress conditions. In addition, the nuclear magnetic resonance(NMR) measurement was conducted on the samples before and after exerting static and dynamic loading to obtain their porosity distribution changes. The experiment results suggested that with the increase of the dynamic loading, the porosity of the backfill sample goes through a two-stage process,which shows a slightly linear decrease and then followed by an exponential increase. The research findings can help understand the damage mechanism and fracture development of backfilled stopes and its host rock in deep underground mines, which are constantly subject to the combination of 3D static confining stress and dynamic loading. 展开更多
关键词 Dynamic loading Backfill-country rock system True triaxial test Coupled static and dynamic loads Nuclear magnetic resonance(NMR) Damage evolution
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Destructive field tests on mobilization of end resistance of cast-in-situ bored piles 被引量:4
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作者 刘念武 张忠苗 +1 位作者 张乾青 房凯 《Journal of Central South University》 SCIE EI CAS 2013年第4期1071-1078,共8页
A series of well-designed full-scale destructive load tests were conducted on six bored piles to investigate the influence of loose debris at the pile tip on end resistance. The results show that soft debris below the... A series of well-designed full-scale destructive load tests were conducted on six bored piles to investigate the influence of loose debris at the pile tip on end resistance. The results show that soft debris below the pile tip will weaken the mobilization of end resistance. The ultimate tip resistance of post-grouted pile is 2.05 times that of the pile without post-grouting and the ultimate tip resistance in the second load cycle is 2.31 times that of pile in the first load cycle. The relationship between unit end resistance and displacement follows a linear model and a bilinear mode in the first load cycle and the second load cycle, respectively, whereas the unit end resistance-displacement response of post-grouted bored pile can be simulated using a bilinear mode. The critical end resistance ranges between 2 000 kN and 3 000 kN and the critical displacement ranges between 2.5 mm and 4.5 mm in the bilinear mode. As for piles rested on moderately-weathered peliticsiltstone, the socketed length has no effect on the end resistance because of the existence of loose debris. 展开更多
关键词 static load test SETTLEMENT POST-GROUTING end resistance socketed depth
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Solid Model Bridge Static Damage Monitoring Based on GBSAR 被引量:4
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作者 Sichun LONG Xiaoqin YUAN +4 位作者 Shide LU Wenting LIU Jinyu MA Wenhao WU Chuanguang ZHU 《Journal of Geodesy and Geoinformation Science》 2022年第4期38-49,共12页
Bridge deformation monitoring usually adopts contact sensors,and the implementation process is often limited by the environment and observation conditions,resulting in unsatisfactory monitoring accuracy and effect.Gro... Bridge deformation monitoring usually adopts contact sensors,and the implementation process is often limited by the environment and observation conditions,resulting in unsatisfactory monitoring accuracy and effect.Ground-Based Synthetic Aperture Radar(GBSAR)combined with corner reflectors was used to perform static load-loaded deformation destruction experiments on solid model bridges in a non-contact manner.The semi parametric spline filtering and its optimization method were used to obtain the monitoring results of the GBSAR radar’s line of sight deformation,and the relative position of the corner reflector and the millimeter level deformation signals under different loading conditions were successfully extracted.The deformation transformation model from the radar line of sight direction to the vertical vibration direction was deduced.The transformation results of deformation monitoring and the measurement data such as the dial indicator were compared and analyzed.The occurrence and development process of bridge deformation and failure were successfully monitored,and the deformation characteristics of the bridge from continuous loading to eccentric loading until bridge failure were obtained.The experimental results show that GBSAR combined with corner reflector can be used for deformation feature acquisition,damage identification and health monitoring of bridges and other structures,and can provide a useful reference for design,construction and safety evaluation. 展开更多
关键词 GBSAR BRIDGE angular reflector static load test deformation monitoring
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ESTIMATION OF FATIGUE LIFE UNDER RANDOM LOADING WITH PLASTIC HYSTERESIS ENERGY THEOREM 被引量:1
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作者 Wu Fumin(Northwestern Polytechnical University, Xi’an, China, 710072)ian Dingshuan(Chinese Flitrht Test Establishment, Xi’an, China, 710089) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1994年第4期289-294,共6页
Fatigue damage of materials includes static damage and cyclic damage.Static damage is a ratio of the plastic energy in first static loading to the statictoughness, while cyclic damage is the ratio of the cyclic plasti... Fatigue damage of materials includes static damage and cyclic damage.Static damage is a ratio of the plastic energy in first static loading to the statictoughness, while cyclic damage is the ratio of the cyclic plastic hysteresis energy to thefatigue toughness. In the calculation, cyclic hardening (or softening) of a material istaken into account, which results in the increase (or decrease) of the yield stress. Forsimplification, it is assumed that stress and strain in cyclic loading vary in accordancewith the hysteresis loop. Fatigue toughness of a material can be detennined bysymmetric cyclic stress controlled fatigue test. A method, rational and convenient forengineering, is proposed to estimate the fatigue life under random loading based onplastic hysteresis energy theorem. Preliminary verification by test is satisfactory. 展开更多
关键词 plastic deforniation static characteristics fatigue tests fatigue life random loads
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Mechanical properties of rock under coupled static-dynamic loads 被引量:11
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作者 Xibing Li Zilong Zhou +4 位作者 Fujun Zhao Yujun Zuo Chunde Ma Zhouyuan Ye Liang Hong 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE 2009年第1期41-47,共7页
Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting... Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting and boring.It is verified that these testing systems can be used to study the mechanical properties of rock material under coupled static and dynamic loading condition and give useful guidance for the deep mining and underground cavern excavation.Various tests to determine the rock strength,fragmentation behavior,and energy absorption were conducted using the updated testing systems.It is shown that under coupled static-dynamic loads,if the axial prestress is lower than its elastic limit,the rock strength is higher than the individual static or dynamic strength.At the same axial prestress,rock strength under coupled loads rises with the increasing strain rates.Under coupled static and dynamic loads,rock is observed to fail with tensile mode.While shear failure may exist if axial prestress is high enough.In addition,it is shown that the percentage of small particles increases with the increasing axial prestress and impact load based on the analysis of the particle-size distribution of fragments.It is also suggested that the energy absorption ratio of a specimen varies with coupled loads,and the maximum energy absorption ratio for a rock can be obtained with an appropriate combination of static and dynamic loads. 展开更多
关键词 rock dynamic testing system coupled static-dynamic loads STRENGTH FRAGMENTATION energy absorption
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Experimental study on DX pile performance in frozen soils under lateral loading
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作者 XiaoBing Liu LiHong Chen +2 位作者 ZhongYang Yu JianXiao Hu Wen Peng 《Research in Cold and Arid Regions》 CSCD 2013年第5期608-613,共6页
Experiments about working mechanism and mechanical characteristics of the DX model pile foundation under lateral dynamic and static loading were conducted by using a model system of the dynamic frozen soil-pile intera... Experiments about working mechanism and mechanical characteristics of the DX model pile foundation under lateral dynamic and static loading were conducted by using a model system of the dynamic frozen soil-pile interaction. The horizontal displacement-force relationship of the pile head and bending moment distribution along the body in frozen soils of different temperatures were discussed. According to test results, both the horizontal disp!acement-force relationship of the DX pile head and bending moment distribution of the DX pile body are smaller than that of equal-diameter piles under same lateral loads. The piles with different plate positions show different displacements and bending moments. This phenomenon is mainly related to the soil temperature and bearing plates locations. Thus, dynamic response analysis of the pile foundation should be taken into account. 展开更多
关键词 DX pile frozen soils lateral static load lateral dynamic load model test
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Lever-Loading System Analysis and Application
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作者 Bingli Liu Bo Zang Hongbiao Quan 《Modern Mechanical Engineering》 2013年第1期55-57,共3页
In order to prove the rationality of structural design and carrying capacity, reasonable design of lever-loading system to apply loadings to some loading-points was needed in spacecraft structural mechanics static tes... In order to prove the rationality of structural design and carrying capacity, reasonable design of lever-loading system to apply loadings to some loading-points was needed in spacecraft structural mechanics static test. Lever-loading system design affects the carrying capacity of test piece. This paper describes the application of different section loading beams. Optimizing and analysis the different models of loading beams, and verification the feasibility of combination beams. 展开更多
关键词 COMPONENT static test Lever loading BEAMS
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新型钢管混凝土梁柱节点力学性能试验研究 被引量:3
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作者 张晓光 曹国旭 +1 位作者 黄远 李乾坤 《建筑结构》 北大核心 2024年第3期1-6,共6页
为研究内加强环式圆钢管混凝土柱与矩形钢管混凝土梁这种新型连接节点的力学性能,设计了缩尺钢管混凝土梁柱节点试件,开展了相同梁柱节点试件的静力加载试验和低周往复加载试验。通过研究该节点试件的破坏模式、荷载-位移曲线以及拟静... 为研究内加强环式圆钢管混凝土柱与矩形钢管混凝土梁这种新型连接节点的力学性能,设计了缩尺钢管混凝土梁柱节点试件,开展了相同梁柱节点试件的静力加载试验和低周往复加载试验。通过研究该节点试件的破坏模式、荷载-位移曲线以及拟静力加载试验的骨架曲线、核心区剪切变形等,分析了节点试件的承载能力、延性和耗能能力,全面考察了同一梁柱节点在静力加载和低周往复加载两种工况下的受力性能和破坏模式。结果表明:钢管混凝土梁柱节点试件核心区强度较强,破坏模式主要为梁端破坏,低周往复加载试验时试件梁柱连接处附近的梁端钢板发生拉裂破坏和钢板鼓曲,静力加载试验时试件梁端焊缝发生拉裂破坏;试件延性较好,加载过程中经历了弹性、弹塑性和塑性发展阶段。最后提出了该类钢管混凝土梁柱节点核心区的抗剪强度计算公式。 展开更多
关键词 钢管混凝土梁柱节点 内隔板 静力加载试验 低周往复加载试验 受力性能 设计方法
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非对称集中荷载下无腹筋RC梁受剪性能试验研究 被引量:1
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作者 袁健 刘家栋 段绍伟 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期141-148,共8页
非对称集中荷载作用下钢筋混凝土无腹筋简支梁具有两个不同的剪跨比,而两剪跨段受剪承载力与剪力作用之间的相对大小存在不确定性.通过开展6根非对称和4根对称集中荷载作用下钢筋混凝土无腹筋简支梁受剪性能试验研究,获取了破坏形态、荷... 非对称集中荷载作用下钢筋混凝土无腹筋简支梁具有两个不同的剪跨比,而两剪跨段受剪承载力与剪力作用之间的相对大小存在不确定性.通过开展6根非对称和4根对称集中荷载作用下钢筋混凝土无腹筋简支梁受剪性能试验研究,获取了破坏形态、荷载-跨中位移曲线和纵向受拉钢筋应变,并分析了《混凝土结构设计规范》(GB 50010—2010)公式、修正压力场理论、基于截面应变分析的抗剪模型和Zsutty统计公式的适用性.结果表明,对于小剪跨比恒为1.0的无腹筋简支梁,大剪跨比为2.0~4.0的梁均在大剪跨段发生剪切破坏;当大剪跨比由3.0增大至3.5时,梁的极限承载力出现由大剪跨段控制转变为小剪跨段控制的现象《.混凝土结构设计规范》(GB50010—2010)预测非对称集中荷载作用下钢筋混凝土无腹筋简支梁发生剪切破坏的位置与试验结果相反,而Zsutty统计公式的预测效果最好. 展开更多
关键词 非对称荷载 钢筋混凝土 无腹筋梁 受剪性能 静力试验
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部分充填式窄幅钢箱-UHPC组合梁抗剪试验研究 被引量:1
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作者 莫时旭 熊豪 +1 位作者 郑艳 柴龙杰 《河南理工大学学报(自然科学版)》 CAS 北大核心 2024年第1期157-164,195,共9页
目的为研究部分充填式窄幅钢箱-UHPC组合梁的抗剪性能,方法对4根倒置组合梁试件通过三点加载方式进行了静载试验,通过研究其负弯矩作用下的破坏形态及变形特征,得到了组合梁的荷载-挠度曲线、应变分布、荷载-滑移曲线、最终破坏形态等... 目的为研究部分充填式窄幅钢箱-UHPC组合梁的抗剪性能,方法对4根倒置组合梁试件通过三点加载方式进行了静载试验,通过研究其负弯矩作用下的破坏形态及变形特征,得到了组合梁的荷载-挠度曲线、应变分布、荷载-滑移曲线、最终破坏形态等。结果试验研究结果表明:UHPC翼板显著提升了组合梁的变形能力和极限承载力;相较于试件SUCB-3(NC翼板),试件SUCB-1(1/2UHPC翼板和SUCB-4(全UHPC翼板))的承载力分别提高了18.2%和27.3%,变形能力则分别增强了38.02%和41.2%;钢纤维的添加能有效地抑制翼板裂缝的开展,钢纤维掺量从0提高到2%,试件的最大裂缝宽度从1.06 mm降低到0.92 mm,变形能力增强了23.61%,承载力则提高了4%。结论提出了考虑钢箱、UHPC翼板和充填混凝土贡献的组合梁抗剪承载力计算公式。 展开更多
关键词 窄幅钢箱-UHPC组合梁 静载试验 抗剪承载力 钢纤维掺量
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不同嵌岩深度下抗拔桩承载特性研究 被引量:1
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作者 刘红军 陈锋 +1 位作者 杨超 周志军 《建筑技术》 2024年第3期274-277,共4页
以广东省江门市某工程为例,通过有限元分析软件ABAQUS,结合地勘报告及现场对桩基进行抗拔静载试验得出的荷载–位移曲线图,建立抗拔桩三维有限元模型进行数值模拟计算分析,研究不同嵌岩深度增量下抗拔桩的承载特性。研究成果表明:增加... 以广东省江门市某工程为例,通过有限元分析软件ABAQUS,结合地勘报告及现场对桩基进行抗拔静载试验得出的荷载–位移曲线图,建立抗拔桩三维有限元模型进行数值模拟计算分析,研究不同嵌岩深度增量下抗拔桩的承载特性。研究成果表明:增加嵌岩深度可在一定程度上提高桩基抗拔承载力,但二者之间并非呈线性增长关系。当嵌岩深度增量为3D时,相较于原试桩的桩顶位移量减小54.2%,抗拔承载力提高105.2%,对桩基抗拔承载力的提高效果尤为显著。 展开更多
关键词 抗拔桩 静载试验 数值模拟 嵌岩深度 承载特性
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不同螺栓等级下共享铁塔挂载连接件承载性能研究 被引量:1
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作者 钟炜辉 赵孟军 +2 位作者 郑玉辉 房正刚 蒋成 《建筑科学与工程学报》 北大核心 2024年第1期93-102,共10页
为研究螺栓等级对挂载连接件承载性能的影响,选取了4.8级普通螺栓(KL-4.8)与8.8级摩擦型高强螺栓(KL-8.8)连接的挂载连接件进行静力试验研究。采用ABAQUS有限元分析软件对其受力性能进行模拟,使用可靠的数值模型系统分析螺栓等级和螺栓... 为研究螺栓等级对挂载连接件承载性能的影响,选取了4.8级普通螺栓(KL-4.8)与8.8级摩擦型高强螺栓(KL-8.8)连接的挂载连接件进行静力试验研究。采用ABAQUS有限元分析软件对其受力性能进行模拟,使用可靠的数值模型系统分析螺栓等级和螺栓直径对连接件承载性能的影响。结果表明:在水平荷载作用下,两种不同螺栓等级连接的挂载连接件节点处均未出现滑移;两种连接件的破坏模式基本一致,左右两侧方钢管底部及右侧方钢管顶部均出现断裂;KL-8.8的整体刚度、极限承载能力以及变形能力均高于KL-4.8;当采用4.8级普通螺栓连接且承载力低于74.13 kN时,螺栓直径不宜小于18 mm,否则螺栓杆会发生剪切变形;当采用8.8级和10.9级高强螺栓连接时,双板件连接处节点偏于刚性连接,挂载连接件的整体刚度和极限荷载主要取决于方刚管、挂载铁杆等其他部件;挂载连接件在承载过程中通过双板件与主材之间的摩擦力和螺栓抗剪来抵抗外载,实际工程中应根据挂载重量合理选择螺栓参数。 展开更多
关键词 共享铁塔 挂载连接件 螺栓等级 承载性能 静力试验 数值分析
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双层圆钢管混凝土长柱压扭滞回性能试验
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作者 周中一 庞新龙 +2 位作者 王涛 靳宇航 罗诒红 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2024年第1期117-129,共13页
为研究双层圆钢管混凝土长柱在压、扭荷载作用下的力学性能,利用研制的Stewart六自由度加载平台,进行了两个普通圆钢管混凝土长柱和两个双层圆钢管混凝土长柱试件在纯扭、压扭作用下的低周往复试验。对比分析了各试件的承载力、扭转变... 为研究双层圆钢管混凝土长柱在压、扭荷载作用下的力学性能,利用研制的Stewart六自由度加载平台,进行了两个普通圆钢管混凝土长柱和两个双层圆钢管混凝土长柱试件在纯扭、压扭作用下的低周往复试验。对比分析了各试件的承载力、扭转变形、耗能、滞回性能,进行了有限元参数分析。研究表明:普通圆钢管混凝土长柱和双层圆钢管混凝土长柱均具有较好的抗扭能力;与普通圆钢管混凝土长柱相比,双层圆钢管混凝土长柱的初始刚度和承载力略有提升,滞回曲线更饱满,耗能能力和延性大幅提升;参数分析表明含钢率一定时,内层钢管径厚比越大,对抗扭越有利;一定范围内的轴向荷载,可提高钢管混凝土柱的抗扭能力。 展开更多
关键词 钢管混凝土 纯扭 压扭 拟静力往复加载 STEWART平台
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钢管混凝土双块式轨枕道床复合受力性能试验
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作者 刘晓春 姚军 +3 位作者 罗延亮 李启航 朱志辉 余志武 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2024年第10期4040-4052,共13页
新型钢管混凝土(CFT)双块式轨枕采用钢管混凝土取代了桁架钢筋的连接构件作用,具有结构简单、安全耐久性好等优点。为研究钢管混凝土双块式轨枕与现浇混凝土道床所形成的轨道结构的复合受力性能,采用某实际工程的材料和工艺制作了一段足... 新型钢管混凝土(CFT)双块式轨枕采用钢管混凝土取代了桁架钢筋的连接构件作用,具有结构简单、安全耐久性好等优点。为研究钢管混凝土双块式轨枕与现浇混凝土道床所形成的轨道结构的复合受力性能,采用某实际工程的材料和工艺制作了一段足尺CFT轨枕减振道床和现浇整体道床,经疲劳试验验证后,用绳锯将其沿横向切割成单承轨台和双承轨台的CFT轨枕道床试件,分别开展试件的轨下截面加载试验和中间截面加载试验,分析道床试件中轨枕、现浇道床、底座板混凝土和钢筋的应力、变形及裂缝的开展演化规律。试验结果表明:CFT轨枕道床受力破坏过程均表现出整体工作、带裂缝工作和破坏的典型三阶段特征;中间截面加载试件破坏时受拉钢筋被拉断而受压区混凝土未被压碎,类似于低筋破坏,轨下截面加载试件因竖向裂缝和弯剪区段斜裂缝之间的混凝土被压碎剥落而失效,受拉纵筋未屈服,类似于斜压破坏;CFT轨枕整体道床试件抗裂能力、承载能力更高,整体道床试件开裂荷载约为减振道床试件相应值的4.7倍,其极限荷载约为减振道床的2.3倍,道床与底座板之间采用拉结钢筋连接后能大幅提升轨道结构刚度和承载能力。CFT轨枕与现浇道床界面黏结及整体工作性能良好,研究成果可供钢管混凝土双块式无砟轨道理论研究和工程应用参考。 展开更多
关键词 钢管混凝土 双块式轨枕 无砟轨道 复合受力 静载试验
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