基于MPA法的交错桁架抗震性能影响因素分析

MPA-based method of staggered truss seismic performance influencing factors analysis

交错桁架在多遇地震下表现出非常良好的抗震性能。本文基于MPA方法,对交错桁架在罕遇地震下的抗震性能进行初步探讨。通过建立有限元平面模型,分析不同结构高度结构高宽比、桁架形式、桁架跨高比、空腹节间距、底层桁架布置以及底层支撑形式对交错桁架在罕遇地震下抗震性能的影响。对比发现:随着结构高宽比和空腹节间距的减小,以及结构高度减小和平面桁架的落地,交错桁架在罕遇地震下的抗震性能均有不同程度的提高。

Staggered truss showed very good seismic performance of multi-earthquake. Based on the premise of MPA, the preliminary study on the seismic performance of the staggered truss rare earthquake. Through the establishment of the finite element plane model,it will be analysised of the seismic performance of staggered truss under severe earthquakes from different structural height, the structure of high aspect ratio, the truss form of truss span depth ratio, fasting section spacing, the underlying truss layout and the form of the underlying support. Contrast found：With the structure of high aspect ratio and fasting section spacing decreases, as well as reduce the structure height and floor truss staggered truss under severe earthquakes, seismic performance have improved to varying degrees.