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钢筋混凝土框架直接基于损伤性能的能力设计理论及方法的研究
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摘要
本文分析了现行规范抗震设计方法的优缺点及近几年出现的一些新问题,回顾了基于性能抗震设计理论的发展现状,系统的概括了基于位移及基于损伤抗震设计的理论框架,并对这两种抗震设计实施方法进行了分析,认为这两种抗震设计方法虽然比基于力的方法更为合理,但基于位移的设计方法是用静力方法去解决在地震作用下的结构设计问题,不考虑地震持续时间、结构往复弹塑性变形和累积滞回耗能等因素的影响;而基于损伤的设计方法虽考虑累积滞回耗能的影响,但它依然属于传统的设计方法范畴,采用“设计—校核”的设计模式,是在结构设计完成的基础上对其进行校核的方法,损伤指标只起到校核作用。
     在此基础上,本文采用直接基于损伤性能的能力设计方法来实现基于性能的设计。针对现有各抗震设计方法存在的问题,通过等效位移考虑地震过程中的滞回耗能影响,同时将损伤指标引入设计过程中,通过用户选用不同的性能目标来实现结构性能控制,从而可以有效的控制结构在地震下的行为,并通过量化的抗震构造措施实现梁、柱的变形能力设计。通过算例进行比较分析,说明了该方法的可行性、准确性及其设计步骤。
In this paper, the merit and fault of methods of seismic design in current code and new problems appearing in recent years are analyzed, the introduction and developments of performance (PBSD) seismic design is reviewed. The formwork of PBSD is founded. It was believed that PBSD is more reasonable than force-based design, but displacement-based design method solve the problem of the process of design by the static method, not considering the influence of duration and hysteretic energy dissipation. Damage performance-based design still belongs to the traditional design method, the damage index is used to checking the structure of the degree of damage after the structure is designed.
    On the basis of these analysis, theory and method of direct damage performance-based capacity design is presented in this paper. The influence of the hysteretic energy dissipation is considered by the equivalent displacement in this method and damage index is used in the process of design. According to the different performance objective, the behavior of structure under the earthquake is controlled effectively. Then the deformation capacity of beams and columns is realized by the earthquake resistant constructional measure. Finally, a design examples shows that the design method presented in the paper is feasible.
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