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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：通过试验、分析和震害分析，指出钢筋混凝土屈曲框架的柱剪力可能比忽略梁的非弹性轴向伸长的分析计算的柱剪力要大。1)建立和验证分析模型，2)对框架进行数值分析和理论分析，3)建立简单合理的梁轴向剪力放大设计公式。结果：编制了钢筋混凝土框架非线性分析的计算机程序，该程序可以模拟框架试验中由非线性循环荷载引起的梁轴向变形。通过与观测伸长率成正比施加轴向约束力的梁试验，对梁模型进行了详细的验证。梁…等不同参数钢筋混凝土框架结构的静力和动力非线性分析在考虑和不考虑梁轴向变形的情况下，进行了更多的深度、柱的刚度、跨数和层数的计算。从理论和解析两方面分析了梁的伸长对柱抗剪性能的影响。结论：1)提出了考虑框架轴向非弹性变形的框架非线性动力分析方法，并通过框架试验和梁体试验进行了验证；2)通过静力和动力非线性分析，研究了梁轴向变形对钢筋混凝土框架柱抗剪性能的影响，得到了较大幅度的柱剪力，特别是受压侧外柱的剪力；3)根据所设计框架的参数，提出了一种通用合理的放大倍数设计方法。较少