Dynamic Instability of Steel Frames under Combined Stressduring Earthquake

地震联合应力下钢框架的动力失稳

基本信息

批准号：
02452208
负责人：
TAKANASHI Koichi
金额：
$ 3.26万
依托单位：
Institute of Industrial Science, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452208/
关键词：
Steel Frame Dynamic Instability Combined Stress Earthquak Response Beam-Column

项目摘要

Steel beam-columns were tested under biaxial and uniaxial bending and varying, axial load as well. Three kinds of loading, types were applied : (1) monotonic loading tests, (2) cyclic loading tests, and (3) computer on-line earthquake response tests. Observations in these tests can be used to check the design formulae for the resistance as well as the deformability of steel members, and also to study an appropriate limitation of axial forces in the beam-column design practice.Additionally, an inelastic portion of a steel beam-column is modeled as an assembly of spring elements, and a simple hysteresis rule is proposed to simulate its inelastic behavior in including the strain-hardening and the Bauschinge's effects. Analyses based on such a model were carried out for each loading cases, and compared with the test results. The results of the analyses proved to agree fairly well with the test results. Especially in the case of the cyclic loading test, very large deformation was observed i … More n the direction where displacement was not constrained, and even such an unstable phenomenon was well simulated by the present analysis.The results of this research project are summarized as follows :1. A computer-controlled testing system was developed to provide varying combined stress states to a beam-column specimen, which would be produced in a specified member of a fictitious complicated structural system such as a high rise building. The effectiveness and the accuracy of such an intelligent loading system were confirmed during all the test procedures.2. An existing design formula to evaluate the resistance of steel beam-columns under biaxial bending and axial load was compared with the test results, and proved to give a conservative evaluation for the axial load smaller than 60 percent of the yield axial load. However, more accurate evaluation of the resistance may be needed in the ultimate limit state design of the beam-columns, and this shall be studied by more extensive sets of experiments and analyses.3. In some of the cyclic loading tests, considerable amounts of plastic deformation were cumulated in the out-of-plane direction. Such an out-of-plane instability shall be investigated more carefully.4. The analysis method based on an inelastic joint model proved to provide a good prediction of the resistance and the deformability of steel beam-columns under combined stress states. Such a modeling can be applied, because of its simplicity, to the analysis on large-scale 3-dimensional steel frames. Less

钢梁柱进行了单轴苯甲轴承，轴向载荷也是三种载荷载荷测试，（2）循环加载测试，（3）计算机在线地震呼吸测试。对于测试以及某些余烬，还可以研究梁柱设计实践中轴向力的适当限制。根据这种模型进行了应变硬化和Bauschinge的效应不受限制，即使是这样不稳定的现象也通过当前分析进行了很好的模拟。汇总的结果：1。开发了计算机控制的测试测试系统，以向光束柱标本提供不同的合并应力状态，该标本是将在所有测试过程中确认了这种绞词载荷系统的小质结构，例如高层建筑物。但是，在最终的限制性状态设计YCLIC载荷测试的最终限制状态设计中，可能需要更准确的轴向负载。 o在合并的应力状态下，钢梁柱的变形性良好，因为它的简单性可以应用于大规模的3二维钢框架。