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PSEUDO-DYNAMIC TESTS ON SERVICEABLE AND ROBUST STEEL FRAMES WITH THE COMBINATION OF HYSTERETIC DAMPERS AND SEMI-RIGID CONNECTIONS

结合迟滞阻尼器和半刚性连接对可使用且坚固的钢框架进行伪动态测试

基本信息

批准号：
09450200
负责人：
OHI Kenichi
金额：
$ 8.96万
依托单位：
The 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：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

This research is to investigate earthquake response characteristics of steel frames with the combination of earthquake resisting elements and semi-rigid connections by quasi-static and dynamic loading tests, pseudo-dynamic tests and earthquake response analysis. In this research, we adopted low-yield-point steel dampers (abbreviated LYP dampers) as earthquake resisting elements and split-tees as semi-rigid connections.1. Earthquake resistant ability of steel frames with low-yield-point steel dampersAt first the results of the quasi-static and dynamic loading tests on LYP dampers show that the shear yield resistance is increased more than two times of quasi-static one. Second, a series of sub-structuring pseudo-dynamic tests on LYP damper inserted studs are performed to examine the ability to reduce seismic responses. Third, seismic monitoring are performed on a 3-story steel building model structure, the original seismic strength of which was intentionally reduced but retrofitted by th … More e damper inserted studs. And these response behaviors simulated by the pseudo-dynamic tests are used to check the validity of constitutive modeling proposed for the dampers.2. Earthquake resistant ability of semi-rigidly jointed steel frames and steel frames with the combination of LYP dampers and semi-rigid connectionsAt first the results of quasi-static loading tests on semi-rigidly jointed steel frames with varying axial load are presented that pinching effect on hysteresis loop under high axial load is different with under no axial load. Damping effect of semi-rigid parts is confirmed by sub-structuring pseudo-dynamic tests, and calculated equivalent damping factors of semi-rigid parts are up to about 1%. Second, the result of sub-structuring pseudo-dynamic tests on steel frames with the combination of LYP dampers and semi-rigid connections are presented the good performance to earthquake in comparison with completed numerical analysis considering plastic deformation capacity of beam member and brittle fracture of welded connection instead of semi-rigid connection.It is demonstrated by a series of sub-structuring pseudo-dynamic tests that a combination of semi-rigid frame and inter-story hysteretic damper creates a fairly good structural system that satisfies not only the serviceability requirement under moderate earthquakes but also the robustness requirement under unexpected severe earthquakes. Less

通过拟静力和动力加载试验、拟动力试验和地震反应分析，研究了抗震构件与半刚性连接组合的钢框架的地震反应特性。在本研究中，采用低屈服点钢阻尼器(简称LYP阻尼器)作为抗震构件，分体式T形三通作为半刚性连接。设置低屈服点钢阻尼器的钢框架的抗震性能首先对LYP型阻尼器进行了静力和动载试验，结果表明，LYP型阻尼器的抗剪屈服能力比准静态提高了一倍以上。其次，对插入LYP阻尼器的栓钉进行了一系列子结构拟动力试验，以检验其减震能力。第三，对一座三层钢结构模型结构进行了地震监测，该结构的原始抗震强度被故意降低，但经过TH…进行了加固更多的e阻尼器插销。并利用拟动力试验模拟的响应行为，验证了所提出的阻尼器本构模型的有效性。LYP型阻尼器与半刚性连接组合的半刚性连接钢框架及钢框架的抗震性能本文首先给出了半刚性连接钢框架在不同轴向荷载作用下的拟静力加载试验结果，发现在高轴向荷载作用下滞回曲线的收缩效应不同于无轴向荷载作用下的滞回效应。通过子结构拟动力试验验证了半刚性构件的减震效果，计算得到的半刚性构件的等效阻尼系数可达1%左右。其次，对采用LYP阻尼器和半刚性连接的钢框架进行了子结构拟动力试验，与考虑梁的塑性变形能力和考虑焊接连接的脆性破坏的完整数值分析结果相比，具有良好的抗震性能。通过一系列的子结构拟动力试验表明，半刚性框架和层间滞回阻尼器的组合产生了一个较好的结构体系，不仅满足了中震下的使用要求，而且满足了在突发强震下的稳健性要求。较少