近断层地震下基于PFD-LRB的半主动隔震系统抗震性能研究

项目名称： 近断层地震下基于PFD-LRB的半主动隔震系统抗震性能研究

项目编号： No.51308487

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 赵大海

作者单位： 燕山大学

项目金额： 25万元

中文摘要： 基础隔震是一种有效的抗震技术，但在近断层地震作用下存在隔震层变形过大而降低隔震效果的问题。为了提高传统隔震系统在近断层地震下的抗震性能，本项目提出PFD(压电摩擦阻尼器)-LRB(铅芯橡胶支座)半主动隔震系统。首先，在考虑PFD非线性特性的基础上，建立近断层地震下半主动隔震系统的减震控制模型，基于模糊控制理论提出调节PFD电压的减震策略，并通过数值仿真验证其有效性。其次，计算破裂向前方向性效应和滑冲效应运动特征的近断层地震下PFD-LRB半主动隔震系统的地震反应，研究不同运动特征的近断层地震动对该半主动隔震系统抗震性能的影响。最后，制作PFD-LRB半主动隔震结构模型并进行振动台试验，与数值分析结果进行对比，检验提出的半主动隔震系统的有效性以及理论分析的准确性。本项目研究对于提高基础隔震系统在近断层地震下的抗震性能具有重要的理论和实际意义。

中文关键词： 近断层地震；压电摩擦阻尼器；铅锌橡胶支座；半主动隔震；性能评估

英文摘要： Base isolation is a very effective seismic resistant technology. However, a conventional seismic isolation system may incur an excessive isolator displacement and decrease the seismic efficiency in near-fault ground motions. In order to enhance the performance of base-isolated structures against near-fault earthquakes, a semi-active isolation system, which is composed of a Piezoelectric Friction Damper (PFD) and Lead Rubber Bearings (LRB), will be proposed in this study. Firstly, the mathematical model of a PFD-LRB semi-active isolation system under near-fault ground motions will be established by considering the nonlinear hysteretic behavior of the PFD. A fuzzy control strategy will be developed in order to adjust the voltage of the PFD that is used in the semi-active isolation system. The control effectiveness of the proposed semi-active isolated system will be demonstrated by numerical simulations. Next, the motion characteristics of near-fault ground motions with rupture forward directivity and fling step on the seismic responses of semi-active isolation system will be calculated. The influence of near-fault ground motions of different motion characteristics on the seismic performance of semi-active isolation system will be investigated. Finally, a PFD-LRB semi-active isolation system model will be fabricate

英文关键词： near-fault ground motions；piezoelectric friction damper；lead rubber bearing；semi-active isolation；performance evaluation