Evaluation of Safety against Collapse under Strong Earthquake Motion

强震作用下的抗倒塌安全评价

基本信息

批准号：
08455249
负责人：
KABEYASAWA Toshimi
金额：
$ 2.62万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Purpose :It has been pointed out from tests, analyses and earthquake damages that column shear forces in beam-yielding reinforced concrete frames could be higher than calculated from an analysis neglecting inelastic axial elongation of beams. The objectives of this study are 1) to develop and verify analytical models, 2) to analyze frames numerically and theoretically, and 3) to establish a simple and rational design formula, for the magnification of the column shear due to the beam axial deformation.Outcome :A computer program for nonlinear analyses of reinforced concrete frames was developed, in which the beam axial deformations due to nonlinear cyclic loading could be simulated as observed in frame tests. The beam model also was verified in detail through the beam tests specially conducted with axial constraint force applied in proportion to the observed elongation. Static and dynamic nonlinear analyses of reinforced concrete frame structures with different parameters, such as beam … More depth, column stiffness, number of spans and stories, were carried out with and without considering the beam axial deformations. The effects of the beam elongation on the column shear were evaluated both analytically and theoretically. A simple and rational design formula for the magnification was derived from the theoretical evaluation based on the mechanical properties of the frames, which was verified through the analytical results.Conclusions :The major findings are : 1) A method for nonlinear and dynamic frame using beam model with inelastic axial deformation was developed, which was verified through the frame tests and the beam tests ; 2) The effects of the beam axial deformations on the column shear of reinforced concrete buildings were investigated through the nonlinear static arid dynamic analyses, from which the column shear forces, especially in the exterior column on compression side, could be much higher than expected from the conventional analysis ; 3) A general and rational design method for the magnification is proposed based on the parameters of the designed frame. Less

目的：它已经从测试，分析和地震损害中指出，即在横梁上固定的钢筋混凝土框架中剪切力的剪切力可能高于从忽略梁的非弹性轴向伸长的分析中计算得出的。这项研究的目标是1）开发和验证分析模型，2）以数值和理论分析框架，以及3）建立一个简单而合理的设计公式，以放大由于光束轴向变形而引起的柱剪切剪切。框架测试。还通过专门用轴向约束力进行的梁测试详细验证了光束模型，该梁模型是按照观察到的伸长率成比例施加的。对具有不同参数的钢筋混凝土框架结构进行的静态和动态非线性分析，例如梁……更深入，柱刚度，跨度和故事的数量，没有考虑到梁轴向变形。分析和理论评估了梁伸长对色谱柱剪切的影响。基于框架的机械性能得出了一个简单且有理的设计公式，该公式是通过分析结果验证的理论评估。结论：1）一种使用弹性轴向变形的非线性和动态框架的方法：1）通过射击射击测试和射击测试进行了验证的非线性和动态框架的方法。 2）通过非线性静态干旱动力学分析研究了梁轴向变形对钢筋混凝土建筑物的柱剪切的影响，从该分析中，柱状剪切力，尤其是在压缩侧的外部柱中，可能比常规分析的预期高得多。 3）基于设计帧的参数提出了一种用于放大的一般和合理的设计方法。较少的