摘要
铅芯橡胶支座(LRB)是一种有效的隔震装置,它通过延长结构的周期、增加结构的阻尼来减小结构的地震反应。在结构隔震分析中,LRB扮演了一个很重要的角色,对其模拟程度的正确与否对整个结构的分析结果将产生很大影响。本文采用大型通用有限元程序ANSYS,对一个单自由度隔震体系进行了LRB性能模拟验证分析,分析表明:在合理确定输入地震动PGA临界点的前提下,采用ANSYS中的Combin40单元来模拟LRB的滞回性能,能获得较为满意的效果;同时通过与SAP2K时程分析比较,也验证了ANSYS分析结构隔震的可靠性。
Lead rubber bearing （LRB） is an effective isolation device which can reduce the structural seismic response by lengthening the structure period and increasing the structure damping. LRB plays an important role during the structural isolation analysis, and will directly have a great effect on analysis results of the whole structure whether the isolation bearing is correctly simulated or not. In this paper, a great current FEA program ANSYS is adopted and the validation analyses of the LRB capability simulation are conducted for a single degree of freedom seismic isolation system. Finally, it is indicated that the satisfactory effects can be obtained by employing the element Combin40 in ANSYS to simulate the LRB hysterestic capability after PGA critical value of the earthquake ground motion input is properly confirmed. Simultaneously, the reliability of analyzing the structural isolation by ANSYS is also validated through comparing with results of the time-history analysis by SAP2K.
出处
《工程抗震与加固改造》
2007年第4期53-56,62,共5页
Earthquake Resistant Engineering and Retrofitting
基金
交通部西部科研项目(200431800024)
