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

本文通过拟静、动载试验、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。本研究采用低屈服点钢阻尼器（简称LYP阻尼器）作为抗震构件，T形节点作为半刚性连接.设置低屈服点钢阻尼器的钢框架抗震性能首先，对LYP阻尼器进行了拟静力和动力加载试验，结果表明，LYP阻尼器的剪切屈服抗力比拟静力时提高了2倍以上。其次，对LYP阻尼器插入栓钉进行了一系列子结构拟动力试验，以检验其降低地震反应的能力。第三，对一个三层钢结构建筑模型结构进行了地震监测，该模型结构的原始抗震强度被故意降低，但通过加固进行了加固。 ...更多信息 e阻尼器插入螺柱。并利用拟动力试验所模拟的阻尼器响应特性来验证所提出的阻尼器本构模型的有效性.半刚性连接钢框架及LYP阻尼器与半刚性连接组合钢框架的抗震性能首先给出了半刚性连接钢框架在变轴力作用下的拟静力试验结果，分析了在高轴力作用下和在无轴力作用下，半刚性连接钢框架滞回曲线的箍缩效应。通过子结构拟动力试验验证了半刚性构件的阻尼效果，计算得到的半刚性构件等效阻尼因子达到1%左右。第二、本文介绍了LYP阻尼器与半刚性连接组合钢框架的子结构拟动力试验结果，并与考虑梁构件塑性变形能力和焊接节点脆性破坏的完整数值分析结果进行了比较，结果表明，LYP阻尼器与半刚性连接组合钢框架具有良好的抗震性能。刚性框架和层间滞回阻尼器创造了一个相当好的结构系统，该系统不仅满足中等地震下的正常使用要求，而且还满足意外严重地震下的鲁棒性要求。少

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