Seismic Performance Evaluation of Controlled Rocking Building Structures with Yielding Base Plates

过去的研究指出，摇摆振动伴随着上升运动的影响可能会减少建筑物在强震地面运动下的地震破坏。在这些研究的基础上，已经开发出了允许在大地震地面运动期间在适当控制下的摇摆振动和上抬运动的结构系统。本研究针对具有屈服底板的控制摇摆建筑结构，探讨其地震反应。主要研究成果如下：1）对带屈服底板的大尺寸柱脚进行了静力试验。从试验结果中定量地考察了循环荷载作用下的变形特性和极限变形能力。2）采用有限元数值分析方法，研究了柱允许上提的可控摇摆体系的三维地震反应，并与基础固定体系的地震反应进行了比较。与静载试验结果比较，底板柱端附近的局部应变峰值未达到极限应变值。通过对第一层柱的局部应力峰值的分析，还发现柱落地处柱的冲击效应很小。3）采用有限元数值分析方法，对受控摇摆体系在三维地震作用下的三维地震反应进行了研究和评价。结果表明，扭转性能和竖向地震分量对结构的抗震性能没有明显影响。4）研究了几种带屈服底板的阻尼器的有效性和柱脚处的安装细节。还研究了屈服基腭的可修复性。

Past studies have pointed out that the effects of rocking vibration accompanied with uplift motion might reduce the seismic damage of buildings subjected to strong earthquake ground motions. Based on these studies, structural systems have been developed that permit rocking vibration and uplift motion under appropriate control during major earthquake ground motions. These systems can lead to reduced seismic response.In this study, the seismic response of the controlled rocking building structures with yielding base plates is examined and evaluated. The results of this study are summarized as follows:1)The large-size column bases with yielding base plates were tested in static loading. The deformation characteristics and ultimate deformation capacity under cyclic behavior were quantitatively examined from the test results. The hysteretic model of yielding base plates was also studied and proposed.2)The three-dimensional seismic response of controlled rocking systems with columns allowed to uplift was evaluated and compared with that of fixed-base systems by finite element numerical analyses. The peak values of local strain near the column end of the base plate were compared with the statically loading test results and did not reach the ultimate strain values. It was also noted that the impact effect on columns at column landing was small from the examination of the peak local stress in columns at the first story.3)The three-dimensional seismic response of controlled rocking systems subjected to three-dimensional seismic motions was examined and evaluated by finite element numerical analyses. It was shown that the torsional behavior and the vertical components of seismic motions did not definitely affect the seismic performance of structures.4)The availability of several types of dampers with yielding base plates and the installation details at the column bases were investigated. The reparability of yielding base palates was also studied.