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介绍了作者研究开发的结构三维弹塑性分析方法及其在建筑物震害研究中的应用。采用杆系模型 ,包括梁、柱、墙单元、拉压杆单元、弹簧单元和阻尼单元 ,可建立各种结构计算模型 (质点系模型、平面或空间框架模型 )。对柱和墙单元等压弯杆件 ,采用了“多弹簧模型”和“纤维模型”来考虑变动轴力和双向弯曲荷载之间的耦合作用 ,能够表达压弯杆件在多轴荷载作用下的力学特性 ,从而比较真实地模拟结构弹塑性地震反应。为了表达各种荷载作用下杆件或弹簧的力和变形关系 ,作者开发和引进了多种材料恢复力模型 ,这些恢复力模型模拟了材料的非线性。在结构分析过程中也采用近似方法考虑了几何非线性。采用以上计算模型 ,作者开发了结构三维弹塑性分析计算机程序 ,用于分析遭受地震作用的建筑物 ,其结果与实际的地震破坏吻合较好 ,能够说明结构的破坏机制。
This paper introduces the structural three-dimensional elasto-plastic analysis method of the author’s research and development and its application in the study of building damage. Rod model, including beam, column, wall unit, tension and compression rod unit, spring unit and damping unit, can be used to build various structural calculation models (particle model, plane or space frame model). For columns and wall elements such as bent bar, the “multi-spring model” and the “fiber model” are adopted to consider the coupling effect between the changed axial force and the two-direction bending load. Which can simulate the structural elastoplastic seismic response more faithfully. In order to express the force and deformation of the bar or spring under various loads, the authors developed and introduced a variety of material restoring force models that simulate the material nonlinearities. In the process of structural analysis, the geometric nonlinearity is considered by the approximate method. Using the above calculation model, the author developed a three-dimensional elastoplastic analysis computer program for the analysis of buildings subjected to earthquake action. The results are in good agreement with the actual earthquake damage and can explain the failure mechanism of the structure.