可恢复功能的预应力装配式钢框架动力弹塑性分析

摘要

In view of a proposed resilient prestressed prefabricated steel frame structural system,the modal and the dynamic elasto-plastic behaviors of the integral structure were analysed.By using the software ABAQUS.The comparative analysis regarding the base-shear force,story drift,residual story drift,equivalent plastic strain and energy dissipation between a rigid steel frame and the resilient prestressed steel frame was carried out under different seismic levels.The results indicate that the resilient prestressed prefabricated steel frame still keeps elastic under 8 degree frequent and designed earthquake.Under 8 degree rare earthquake,the energy dissipation of the structure depends mainly on the internal damping as well as a friction dissipation damper,and a relative minor portion of energy dissipation comes from the inelastic deformation,which reduces the main structure plastic development and damage.The resilient prestressed prefabricated steel frame has the better seismic behavior than the resilient prestressed steel frame.%针对提出的可恢复功能的预应力装配式钢框架结构体系，采用 ABAQUS 软件对其整体结构进行了模态分析和动力弹塑性分析，并与刚接框架及可恢复功能的预应力钢框架在不同水准地震动下的楼层基底剪力、层间位移角、残余位移角、等效塑性应变以及结构耗能等性能进行对比分析。研究表明：可恢复功能的预应力装配式钢框架在8度多遇、设防地震作用下基本保持弹性，在8度罕遇地震时结构主要依靠阻尼耗能和摩擦阻尼器耗能，非弹性耗能相对较少，减少了主体结构的塑性发展和损伤程度，具有良好的抗震性能和恢复结构功能的能力。可恢复功能的预应力装配式钢框架在层间位移角控制和减少主体结构塑性性能方面优于可恢复功能的预应力钢框架。