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合理有效地控制地震作用下建筑结构的损伤机制,是提高建筑结构抗震性能的重要手段。体系设计、需求分析和构件设计是结构损伤机制控制的三个主要方面。在总结建筑结构抗震损伤机制控制发展过程的基础上,着重于需求分析,建议了一套基于建筑结构损伤机制控制的抗震设计方法。该方法采用两阶段设计:在多遇地震设计阶段,采用线弹性分析给出结构预期损伤部位的承载力需求;在罕遇地震设计阶段,采用等效线性化法定量给出结构在罕遇地震作用下实现预期损伤机制下损伤部位的变形能力需求和非损伤部位的承载力需求,为构件的抗震设计提供依据。通过一个钢筋混凝土延性框架结构算例说明了建议方法的实施流程,并通过动力弹塑性分析评价了建议方法的效果。分析结果表明,与现行规范方法相比,建议方法更有助于预期损伤机制的实现。
Reasonably and effectively control the damage mechanism of the building structure under earthquake action is an important means to improve the seismic performance of the building structure. System design, requirements analysis and component design are the three main aspects of structural damage control. On the basis of summing up the development of control mechanism of seismic damage mechanism of building structure, the paper focuses on requirement analysis and proposes a set of seismic design methods based on the control of structural damage mechanism. This method uses two-stage design: in the case of frequent earthquake design, the linear elastic analysis is used to give the bearing capacity requirements of the expected damage location of the structure; in the rare earthquake design stage, the equivalent linearization method is used to quantitatively give the structure in rare earthquakes Under the action of expected damage mechanism to achieve the required deformation capacity of the damaged site and the bearing capacity of the non-damaged site, provide the basis for the seismic design of the component. An example of a ductile RC frame structure is presented to illustrate the implementation of the proposed method and the effectiveness of the proposed method is evaluated by dynamic elasto-plastic analysis. The results of the analysis show that the proposed method is more conducive to the expected damage mechanism than the current normative method.