Nonlinear Model of RC Columns Considering Axial Collapse

考虑轴向倒塌的钢筋混凝土柱非线性模型

基本信息

批准号：
10650568
负责人：
YOSHIMURA Manabu
金额：
$ 1.66万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650568/
关键词：
RC column axial load carrying capacity collapse deformation increment loading path failure surface buckling fiber model 主筋の履歴劣化中間層の層崩壊鉄筋コンクリート柱 2方向片振り両振り軸崩壊圧壊

项目摘要

During the 1995 Kobe earthquake, about thirty concrete buildings suffered complete collapse at an intermediate story. To study such collapse, seismic tests of RC columns subjected to rather low axial load corresponding to the intermediate story were conducted. The loading path was a test parameter. The ultimate limit state, as was defined as state of the loss of axial load carrying capacity or collapse, was mainly discussed. The major findings from the test are, 1) the lateral deformation and axial deformation at the ultimate limit state vary depending on the deformation path imposed on each specimen, and 2) on the contrary, the deformation increment ratio, a ratio of vertical deformation increment to lateral deformation increment at the ultimate limit state does not vary depending on the deformation path, the reason for which can be explained by plastic theory in such that the collapse occurs when the failure surface is reduced to a certain size.The fiber model analysis was applied to simulate the test results, where the hysteresis deterioration of steel due to buckling was considered. Although the computed results did not agree fully well with the observations, they were much better than the results derived from the analysis without considering the buckling.

在1995年的科比地震中，大约三十个混凝土建筑在一个中间故事中彻底崩溃。为了研究这种崩溃，进行了与中间故事相对应的相当低轴向负载的RC柱的地震测试。加载路径是测试参数。主要讨论了轴向负荷承载能力或塌陷的损失状态的最终极限状态。测试中的主要发现是，1）在最终极限状态下的横向变形和轴向变形因每个样品上施加的变形路径而异，而2）在相反的情况下，变形比率，垂直变形的比率依赖于垂直限制的垂直变形率在最终的情况下依赖于垂直变形的比例，而依赖于以下方面的理论依赖于以下方面的理论，依赖于以下方面的依据，依赖于以下方面的依据，依赖于以下方面的偏差，依赖于这种情况，依赖于这种情况，依赖于以下方面的变形，这是依赖于以下方面的依据。当将故障表面降低到一定大小时，就会崩溃。应用纤维模型分析以模拟测试结果，其中考虑了由于屈曲而导致的钢磁滞恶化。尽管计算的结果与观察结果并不完全吻合，但它们比在不考虑屈曲的情况下得出的结果要好得多。