带摩擦阻尼器底部框架砌体减震结构地震响应分析

研究底部框架砌体双功能减震结构在地震激励下的响应。该结构通过在底部框架设置摩擦阻尼器并在框架顶层与砌体底层之间增设隔震层,形成底部框架上部砌体的双功能减震结构。首先针对设置摩擦阻尼器耗能减震结构的地震反应振动方程求解,给出状态方程直接积分法,由此对结构进行地震激励下的响应分析,再与SAP2000软件分析结果进行对比,两者结果吻合较好。另外,采用强制解耦法进行相应计算,并与前述分析进行对比,结果表明强制解耦法对求解结构第一、二阶振型反应偏差较小,但对于求解高阶振型存在较大偏差,且强制解耦法高估了结构的减震效果。研究结果表明,这种新型减震结构具有良好的减震性能,采用状态方程直接积分法对该结构的分析具有较强的实用性。

Analysis of Seismic Response of Shock-absorbing Structure with Friction Dampers in Bottom Frame

In this paper, the seismic response of bottom-frame-masonry buildings subjected to the earthquake excitation is investigated. Friction dampers are installed in the bottom frame, and the isolation layer is arranged between the lower bottom frame and the upper masonry structure, forming a bifunctional damping structure. First, the seismic response equation of the energy dissipation structure is solved by the state equation direct integration method. Then, the response of the structure under seismic excitation is analyzed. The results are compared with those of the SAP2000 calculation, indicating a very well agreement. Meanwhile, the forced decoupling method is also adopted to study the seismic response of the structure simultaneously. The results were compared with those of the state equation direct integral method. It indicates that there are good precisions for the first and second order vibrations, and there are large deviations for higher order vibrations. The forced decoupling method overestimates the damping effect of the structure. Research results show that this new type of shock-absorbing structure possesses good shock absorption performance, and the state equation direct integration method has strong practicability in analyzing the seismic response of structures.