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

以往的研究指出，摇摆振动伴随着隆起运动的影响可以减轻建筑物在强震作用下的震害。在这些研究的基础上，已开发出允许在大地震地面运动期间适当控制摇摆振动和隆起运动的结构系统。这些体系可以降低地震反应。在这项研究中，受控底板屈服摇摆建筑结构的地震反应被检查和评估。本文的研究成果总结如下：1)进行了大尺寸屈服板柱脚的静载试验。根据试验结果，定量考察了其在循环荷载作用下的变形特征和极限变形能力。研究并提出了底板屈服的滞回模型。2)通过有限元数值分析，计算了柱子允许上拔的受控摇摆体系的三维地震反应，并与固定基础体系的地震反应进行了比较。将底板柱端附近的局部应变峰值与静载试验结果进行了比较，未达到极限应变值。通过对第一层柱子局部应力峰值的检验，还发现柱子落地时对柱子的冲击作用较小。3)采用有限元数值分析方法，对受控摇摆系统在三维地震作用下的三维地震反应进行了分析和评价。结果表明，结构的扭转性能和竖向地震动分量对结构的抗震性能没有明显的影响。4)研究了几种具有屈服底板的阻尼器的可行性和柱脚的安装细节。此外，还研究了松动基托的可修复性。

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.