【作者】 吴雁江；

【导师】 傅剑平；

【作者基本信息】 重庆大学 ， 结构工程， 2004， 硕士

【摘要】 钢筋混凝土剪力墙是高层建筑结构中的关键构件,在抗震剪力墙结构、框架——剪力墙结构和框架——核心筒结构中 ,既起着保证侧向刚度的作用,又起着提供基本抗震能力和参与耗散地震能量的作用。为了保证在按延性思路设计的结构中剪力墙能具有良好的延性性能,就必须保证它在达到预计的强震非弹性反应之前不出现剪切破坏,因此,规定合理的抗震抗剪能力计算公式就成为延性结构剪力墙抗震设计中的关键措施。到目前为止,我国《混凝土结构设计规范》GBJ50010-2002中,对于抗震剪力墙规定的抗剪公式是在非抗震剪力墙抗剪性能试验的基础上经专家裁定给出的,未进行过任何抗震剪力墙的抗剪性能试验,也未收集和参考国外相应的试验结果,为了改善我国规范在抗震关键构件——剪力墙抗剪设计中的这一薄弱环节,重庆大学土木工程学院在规范第六批研究课题中承担了抗震剪力墙抗剪性能试验研究的项目。本论文的试验研究工作即属于该研究项目的部分内容。根据对国外已有试验结果的分析,我们认为比较缺乏的内容为在一定轴压比下的有翼缘工字形截面剪力墙的抗剪性能试验。为此,本文设计并实施了两个截面尺寸相对较大的工字型截面剪力墙构件的低周交变抗剪性能试验,试验中轴力保持恒定。在试验中,除对相关部位钢筋应力作了广泛全面测定并获得了水平力(P)——水平位移(Δ)滞回曲线外,还尝试对剪力墙的弯曲和剪切变形作了全过程跟踪测试,最后,两个试件都达到了预计的失效状态,即在正截面受拉钢筋屈服后的一定位移延性状态下发生了剪切破坏。两个构件的水平钢筋配筋率及混凝土强度取值不同,以之试验的结果(即测得的延性性能)对改进我国抗震剪力墙的抗剪公式有重要的参考价值。论文最后还将试验结果与各国规范提出的抗剪公式(不考虑可靠度因素)作了对比,得出了一些有倾向性的看法。更多还原

【Abstract】 Reinforced concrete shear walls are critical members in modern high-rise buildings. In the seismic structural wall systems, Frame-wall systems and the frame-core systems, walls are important for ensuring lateral stiffness, contributing to basic earthquake resistance and energy dissipation. In order to ensure the ductile behavior of walls in structures designed according to ductility concept, shear failure should be prevented before walls response nonelastically to an expected extent under strong ground motion. Therefore, in the seismic design of ductile wall systems, it is critical to definite appropriate formula for calculating seismic shear capacity. By far, without any tests on the seismic shear behavior of walls or referring to any relevant test abroad, the formula for calculating seismic shear capacity of walls in Chinese Code <Code for design of concrete structures> GB 50010-2002 is developed only based on the tests of shear behaviors of nonsesmic walls, and judgments of professionals. In order to improve the weakness in the shear design of critical earthquake-resistant members——shearwalls, the Civil Engineering College of Chongqing University undertakes the project of test investigations on shear behaviors of seismic shearwalls in the 6th batch of research subjects on the Code. By analyzing the relevant experimental results from foreign countries, we found what are still limited are tests on shear behaviors of I-shape shearwalls with constant axial compression force. Under such background, Two I-shape shearwalls with relatively big scale are designed and tested under reversed cyclic horizontal forces, Constant axial forces maintained throughout tests. During the tests, the stresses of the reinforcement at relevant places were traced, and the hysteric curves of the specimens are gained, and the flexural and shear deformations are tied to be traced and recorded throughout the tests. Finally, the two specimens failed in the expected way, that is, fail in shear mode after the flexural tensile reinforcement yieldedand the specimens reach a certain displacement ductility. The shear reinforcement ratio and the concrete strength of the two specimens are different. The test result (the ductility of the specimens gained in the tests) are of important value for the improvement and revising of our formula on shear strength of seismic shearwalls. <WP=7>At the end of the thesis, comparisons on the test results and the values predicted by different codes (not considering reliability) are carried out and some orientational points of view are obtained.更多还原