Critical cyclic stress ratio of undisturbed saturated soft clay in the yangtze estuary under complex stress conditions     

刘功勋  栾茂田  唐小微  王忠涛  郭莹 《天津大学学报(英文版)》2010,16(4):295-303

There exists a critical cyclic stress ratio when sand or clay is subjected to cyclic loading. It is an index distinguishing stable state or failure state. The soil static and dynamic universal triaxial and torsional shear apparatus developed by Dalian University of Technology in China was employed to perform different types of tests on saturated soft marine clay in the Yangtze estuary. Undisturbed samples were subjected to undrained cyclic vertical and torsional coupling shear and cyclic torsional shear after three-directional anisotropic consolidation with different initial consolidation parameters. The effects of initial orientation angle of major principal stress, initial ratio of deviatoric stress, initial coefficient of intermediate principal stress and stress mode of cyclic shear on the critical cyclic stress ratio were investigated. It is found that the critical cyclic stress ratio decreases significantly with increasing initial orientation angle of major principal stress and initial ratio of deviatoric stress. Compared with the effects of the initial orientation angle of major principal stress and initial ratio of deviatoric stress, the effect of initial coefficient of intermediate principal stress is less evident. Under the same consolidation condition, the critical cyclic stress ratio from the cyclic coupling shear test is lower than that from the cyclic torsional shear test, indicating that the stress mode of cyclic shear has an obvious effect on the critical cyclic stress ratio. The main reason is that the continuous rotation in principal stress directions during cyclic coupling shear damages the original structure of soil more than the cyclic torsional shear does.  相似文献   

Bilateral shear strength of rectangular frame column based on simplified space truss-arch model     

DONG Chun-min  SUN Jia-ji  LIAN Jin 《重庆大学学报(英文版)》2010,9(4):195-200

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.  相似文献   

Behavior of reinforced concrete structural walls with various opening locations: experiments and macro model     

Masanobu SAKASHITA  Susumu KONO  Hitoshi TANAKA 《浙江大学学报(A卷英文版)》2010,11(3):202-211

Two experimental tests of three-storied reinforced concrete structural walls having large openings were performed.Based on an original macro model,a multiple modified macro-model was proposed to develop a simple method to design a reinforced concrete structural wall with large openings and various opening locations.The interaction between reinforcement ties and concrete struts formed along the perimeter of openings was neglected in the original model.However,the strut-and-tie node was proposed to take account of such interaction in the proposed model.The predicted behavior of two specimens using such a proposed model was compared with the experimental results.It is shown that the behavior of structural walls with large openings could be modeled well using the proposed model.Moreover,the study indicates that the proposed model is applicable even in cases of multi-story structural walls having large openings and various opening locations.  相似文献   

外墙EPS保温施工质量控制措施分析   总被引：1，自引：0，他引：1  

李长银  邱雅平 《泰州职业技术学院学报》2010,10(1):73-75

外墙EPS保温以其质量可靠,施工周期短,可弥补结构工程的一些缺陷等优势,已被广泛应用,文章从图纸审查、施工原材料的质量和施工工艺等方面阐述了如何确保工程质量。  相似文献   

双参数地基上土钉墙面层土压力计算     

王立峰  祝江鸿 《科技通报》2012,28(3):94-99

土钉墙面层承受部分土(水)压力,文中把土钉墙面层看作是弹性地基上的有限长梁,在试验的基础上,推导了基于双参数地基的成层土层分布的土钉墙面层在土钉拉力作用下的挠曲线、转角、弯矩和剪力方程,并与实测数据进行了比较分析,验证了模型的合理性,得到的解析解基本上可以反映土钉墙面层土压力的分布.在此基础上,探讨了不同土性土层中土钉墙面层土压力的分布.面层土压力在土层的分界面上位移连续土压力突变;作用在软弱土层的面层土压力比硬土层上的面层土压力大;上软下硬型较上硬下软的土层分布更能使面层土压力得到充分发挥;同时文中计算了面层土压力换算成荷载与土钉拉力的比值,面层对于土压力的作用随着深度的增加表现得愈加明显,提出针对不同地区不同深度和不同土性条件下应给出比值的建议值,以使土钉墙的设计更符合其真实的作用机理.文中得到的结论和计算方法对于进一步研究土钉墙的作用机理及设计中如何充分发挥面层的作用等具有重要的理论意义和实际应用价值.  相似文献   

装载计算机操作中改善船体纵向受力状况的方法     

邱文昌  吴善刚 《上海海事大学学报》1998,(2)

介绍了在装载计算机操作中改善船舶纵向受力（切力和弯矩沿船长分布）状况的基本原理、操作步骤和操作实例。它为在装载计算机操作中如何选定合适的位置,采取调整货物（或集装箱）装载量或打、排压载水等措施来改善船舶切力和弯矩沿船长分布的状况提供了一种实用方法。  相似文献   

释墙   总被引：1，自引：0，他引：1  

王毅 《湖南师范大学社会科学学报》1999,(3)

关于“墙”的概念,在深入考证了墙的起源、用料、建制规模、作用、称谓之后,应该定义“墙”是“指房屋、园场、古代国家周围的人筑障壁”。同时还指出各种权威工具书释墙的失误  相似文献   

山区房屋背面兼作挡土墙的典型设计——三明市×办公楼工程实录     

Liu Gefei Sanming Architectural Design Institute  Sanming 《福建工程学院学报》1999,(1)

简要叙述陡坡地段挡土墙和建筑后墙合一的结构形式与技术经济效果,旨在对建筑场地紧缺的我省山区建筑工程予以推广。  相似文献   

波状粗糙壁模型流动的壁面热流和阻力关联关系的数值研究     

李玉川  鲍麟 《中国科学院大学学报》2019,36(6):736-744

微粗糙壁面上高速气流的流动和传热特性是当前关注的问题。以半无穷长正弦波状板作为微粗糙壁面模型,使用OpenFOAM程序,数值研究不同来流参数和不同波幅的正弦波状板流动。结果表明,在波状壁流动中,壁面热流系数C_Q与总阻力系数C_D呈现出直接关联,C_Q/C_D是表征粗糙壁流动与传热特性的关键参数。对于附着型流动,C_Q/C_D仅取决于粗糙度与边界层厚度之比,即等效粗糙度h;而流动产生分离后,C_Q/C_D不再随粗糙度变化,仅与波状板相似变化后的位置参量有关。  相似文献   

钢框架-冷弯薄壁型钢组合墙体结构抗震性能有限元分析     

张铮  郭贺贺  林韩  陈笃海 《福建工程学院学报》2023,(1):29-34

利用有限元软件ABAQUS对纯钢框架试件、冷弯薄壁型钢组合墙体试件、钢框架-冷弯薄壁型钢组合墙体试件、覆双面OSB板的钢框架-冷弯薄壁型钢组合墙体试件进行水平低周往复荷载作用下研究,分析了试件的滞回曲线、骨架曲线、抗侧刚度、延性和耗能等。结果表明,钢框架与冷弯薄壁型钢组合墙体有明显的组合效应;冷弯薄壁型钢组合墙体能明显增强钢框架结构的承载力、刚度、延性和耗能能力;覆双面OSB板钢框架-冷弯薄壁型钢组合墙体结构抗震性能较不覆板的钢框架-冷弯薄壁型钢组合墙体结构抗震性能好。  相似文献