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用“∧”形拱和斜向基础跨越地下工程的设计探讨
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作者 唐壮丽 《中南工学院科技通讯》 1997年第2期14-16,共3页
介绍了用“∧”形拱和斜向基础跨越地下工程时“∧”形拱和斜向基础的设计方法,讨论了其适用范围。
关键词 建筑结构 ∧形拱 跨越地下工程 斜向基础
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Influence of underground water seepage flow on surrounding rock deformation of multi-arch tunnel 被引量:11
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作者 李夕兵 张伟 +1 位作者 李地元 王其胜 《Journal of Central South University of Technology》 EI 2008年第1期69-74,共6页
Based on a typical multi-arch tunnel in a freeway, the fast Lagrangian analysis of continua in 3 dimensions(FLAC3D) was used to calculate the surrounding rock deformation of the tunnel under which the effect of underg... Based on a typical multi-arch tunnel in a freeway, the fast Lagrangian analysis of continua in 3 dimensions(FLAC3D) was used to calculate the surrounding rock deformation of the tunnel under which the effect of underground water seepage flow was taken into account or not. The distribution of displacement field around the multi-arch tunnel, which is influenced by the seepage field, was gained. The result indicates that the settlement values of the vault derived from coupling analysis are bigger when considering the seepage flow effect than that not considering. Through the contrast of arch subsidence quantities calculated by two kinds of computation situations, and the comparison between the calculated and measured value of tunnel vault settlement, it is found that the calculated value(5.7-6.0 mm) derived from considering the seepage effect is more close to the measured value(5.8-6.8 mm). Therefore, it is quite necessary to consider the seepage flow effect of the underground water in aquiferous stratum for multi-arch tunnel design. 展开更多
关键词 multi-arch tunnel underground water seepage flow coupling flow and stress surrounding rock deformation vault settlement
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Rate-Sensitive Numerical Analysis of Dynamic Responses of Arched Blast Doors Subjected to Blast Loading 被引量:2
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作者 陈力 方秦 +1 位作者 章毅 张亚栋 《Transactions of Tianjin University》 EI CAS 2008年第5期348-352,共5页
Current practice in analysis and design of blast doors subjected to blast loading considers only simple boundary conditions and material properties. The boundary conditions and material properties, in fact, have consi... Current practice in analysis and design of blast doors subjected to blast loading considers only simple boundary conditions and material properties. The boundary conditions and material properties, in fact, have considerable influence on the response of blast doors subjected to blast loading. In this paper, the dynamic responses of a reinforced concrete arched blast door under blast loading were analyzed by the finite element program ABAQUS, combined with a previously developed elasto-viscoplastic rate-sensitive material model. And the effect of the surrounding rock mass and contact effect of the doorframe were also taken into account in the simulation. It is demonstrated that the strain-rate effect has considerable influence on the response of reinforced concrete blast door subjected to blast loading and must be taken into account in the analysis. 展开更多
关键词 arched blast door strain rate blast loading dynamic response
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Warm forming behavior of high strength aluminum alloy AA7075 被引量:29
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作者 WANG Hui LUO Ying-bing +2 位作者 Peter FRIEDMAN CHEN Ming-he GAO Lin 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期1-7,共7页
The formability of aluminum alloy AA7075 at elevated temperature was investigated through experiment. Stress-strain relationship at different temperatures and forming speeds were investigated through tensile testing. ... The formability of aluminum alloy AA7075 at elevated temperature was investigated through experiment. Stress-strain relationship at different temperatures and forming speeds were investigated through tensile testing. Deep drawing and stretch formability were also tested through limiting drawing ratio (LDR) and limiting dome height (LDH) tests. Finally, post forming mechanical property testing was conducted to investigate the effects of exposure to warm forming temperatures on the mechanical properties. Results show that deep drawing and stretch formability of AA7075 can be significantly improved when the blank is heated to 140-220 °C. At temperature over 260 °C, formability and post forming mechanical properties begin to decrease due to the effect of the heating and forming processes on the material's temper. 展开更多
关键词 aluminum alloy 7075 warm forming limiting drawing ratio (LDR) limiting dome height (LDH)
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Calculation and Analysis of Internal Force in Arch Structure of Frozen Soil
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作者 YUE Feng-tian ZHANG Yong SHI Rong-jian 《Journal of China University of Mining and Technology》 EI 2005年第4期279-282,共4页
Aimed at the frozen soil arch reinforcement form of upside shed used for the shield machine launching in tunneling the internal force of the structure was calculated with the aid of the structural mechanics theory. Co... Aimed at the frozen soil arch reinforcement form of upside shed used for the shield machine launching in tunneling the internal force of the structure was calculated with the aid of the structural mechanics theory. Considering the space characteristics of the structure, this calculating method is suitable for practical engineering. Moreover, the behavior of the freezing arch reinforcement structure was analyzed combined with an engineering case. 展开更多
关键词 shield machine launching freezing reinforcement arch structure internal force
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The Stability Study of Globe Transportation Center of Beijing Capital International Airport
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作者 马骏 周岱 +1 位作者 朱忠义 柳杰 《Journal of Shanghai Jiaotong university(Science)》 EI 2006年第3期371-377,共7页
The stability of long span steel arch structure of globe transportation center (GTC) in the Beijing Capital International Airport was studied. Different objective models such as single arch model, composite arch model... The stability of long span steel arch structure of globe transportation center (GTC) in the Beijing Capital International Airport was studied. Different objective models such as single arch model, composite arch model and global structural model were introduced to analyze the structural stability by means of the finite element technique. The eigen buckling factor of the steel arch structure was analyzed. The geometrical nonlinearity, elastic-plastic nonlinearity and initial imperfection were taken into account in the investigation of the structural buckling, and the nonlinearity reduction factors for the steel arch structure were discussed. The effects of geometrical nonlinearity and initial imperfection on the structural buckling are light while the effect of material nonlinearity is quite remarkable. For a single steel arch, the dominant buckling mode occurs in out-of-plane of arch structure. The out-of-plane buckling factor of the composite steel arch is greater than that of the single steel arch while the in-plane buckling factor of the former is somewhat less than that of the latter. Moreover, the webs near the steel arch feet have the lowest local buckling level and the local buckling is more serious than the global buckling for the global structure. 展开更多
关键词 long-span steel arch structure NONLINEARITY BUCKLING INSTABILITY
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Proportioning Criteria for Traditional and Innovative Extrados Techniques for the Strengthening of Barrel Vaulted Structures Subjected to Rocking of the Abutments
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作者 Luca Ferrario Alessandra Marini +1 位作者 Paolo Riva Ezio Giuriani 《Journal of Civil Engineering and Architecture》 2010年第5期1-14,共14页
In this paper, the behavior of barrel-vaulted structures undergoing rocking of the abutments and the effectiveness of a few retrofit solutions are discussed. The comprehension of the structural performance of vault-ab... In this paper, the behavior of barrel-vaulted structures undergoing rocking of the abutments and the effectiveness of a few retrofit solutions are discussed. The comprehension of the structural performance of vault-abutment systems is fundamental for their seismic vulnerability assessment, and for the design of efficient strengthening techniques. In the paper, traditional techniques such as extrados thin concrete slab or masonry spandrel walls as well as an innovative solution with an extrados thin improved lime mortar slab reinforced by means of glass fiber mesh are considered. The different strengthening solutions are studied and compared on the basis of the results of non linear numerical analyses and by reference to a simplified analytical approach. Numerical and analytical models are validated through comparison with the results of a recent experimental study focusing on the behavior of vaulted masonry structures subjected to rocking of the abutments. The validated models can be used by engineers for the seismic vulnerability assessment of masonry vaulted structures as well as for the proportioning of possible extrados strengthening solutions, and will be used in the future to explore different structural system configurations. 展开更多
关键词 Abutment rocking vault abutment system extrados reinforcement.
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Bilateral shear strength of rectangular frame column based on simplified space truss-arch model
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作者 董春敏 《Journal of Chongqing University》 CAS 2010年第4期195-200,共6页
To investigate the bilateral shear strength of rectangular frame column subjected to oblique horizontal load, we presented a simplified space truss-arch model developed from unilateral truss-arch model. Main parameter... To investigate the bilateral shear strength of rectangular frame column subjected to oblique horizontal load, we presented a simplified space truss-arch model developed from unilateral truss-arch model. Main parameters in the new model were the cross-sectional area, transverse reinforcement raito, axial load, and material strength of the column. The reduction coefficient of concrete sterength owing to the severe cracking of column was also introduced in the model. Finally, 14 specimens under oblique horizontal load were tested to verified the feasibility and applicability of the space truss-arch model. 展开更多
关键词 space truss-arch model rectangular frame column bilateral shear strength oblique horizontal load experimental research
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Parameter Variations of Identified Model for Static Deformation Analysis of Arch Dam
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作者 Jiann-Shiun Lew 《Journal of Civil Engineering and Architecture》 2016年第8期894-900,共7页
The structural health monitoring of a dam is important for maintaining the safe operation and longevity of the dam system. The structural health of a large dam can be monitored from the measured static deformation. Th... The structural health monitoring of a dam is important for maintaining the safe operation and longevity of the dam system. The structural health of a large dam can be monitored from the measured static deformation. This paper presents an investigation of the parameter variations of the identified model of the measured long-term static deformation for the structural health monitoring of Fui-Tsui Dam, which is located in a very active seismic zone of Taiwan. The measured static deformation is characterized as a function of the measured physical parameters, including the effects of hydrostatic pressure and temperature variation. The identified parameters, associated with the effects of hydrostatic pressure and temperature variation, change with environmental factors, such as flooding, earthquake and foundation change. 展开更多
关键词 Static deformation large dam MODELING parameter variation structural health monitoring.
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High-performance polyamide nanofiltration membrane with arch-bridge structure on a highly hydrated cellulose nanofiber support 被引量:4
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作者 Xiangxiu Teng Wangxi Fang +6 位作者 Yuanzhe Liang Shihong Lin Hongzhen Lin Shasha Liu Zhenyi Wang Yuzhang Zhu Jian Jin 《Science China Materials》 SCIE EI CSCD 2020年第12期2570-2581,共12页
Nanofiltration(NF)membranes with outstanding performance are highly demanded for more efficient desalination and wastewater treatment.However,improving water permeance while maintaining high solute rejection by using ... Nanofiltration(NF)membranes with outstanding performance are highly demanded for more efficient desalination and wastewater treatment.However,improving water permeance while maintaining high solute rejection by using the current membrane fabrication techniques remains a challenge.Herein,polyamide(PA)NF membrane with archbridge structure is successfully prepared via interfacial polymerization(IP)on a composite support membrane of saltreinforced hydrophilic bacterial cellulose nanofibers(BCNs)nanofilm/polytetrafluoroethylene(BCNs/PTFE).The strong hydration of BCNs promotes Marangoni convection along water/organic solvent interface during the IP process,which creates extra area for interfacial reaction and produces a thin PA active layer with arch-bridge structures.These arch-bridge structures endow the resulting PA active layer with substantial larger active area for water permeation.Consequently,the PA NF membrane exhibits exceptional desalination performance with a permeance up to 42.5 L m^-2h^-1bar^-1 and a rejection of Na2SO4as high as 99.1%,yielding an overall desalination performance better than almost all of the state-of-the-art NF membranes reported so far in terms of perm-selectivity. 展开更多
关键词 nanofiltration membrane crumpled structure cellulose nanofibers interfacial polymerization DESALINATION
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