建筑结构地震失效模式可控设计

Controllable design of seismic failure mode for building structures

"强柱弱梁"整体地震失效模式的耗能机制明确,结构承载能力和变形能力强、延性好,是结构抗震设计希望出现的失效模式。主要论述建筑结构整体地震失效模式的可控设计方法,基于性能的塑性设计方法和采用柱树对结构柱进行重新设计的方法。前者采用能量平衡来计算地震作用并通过塑性设计来确定结构内力分配,后者在规范设计基础上采用柱树手段对结构柱进行重新设计。最后论述了结构基于规范体系实现整体地震失效模式的策略。研究成果对建筑结构抗震设计理论的发展具有重要意义。

The'strong-column weak-beam'global failure mechanism has explicit energy dissipation mechanism,good load-carrying and deformation capacity and high ductility demand,which is the desirable failure mode for structural seismic design. The controllable design method of seismic failure mode for building structures was mainly discussed. One is the performance-based plastic design method that employs the energy balance equation to calculate the seismic actions and determine the internal force distribution using plastic design. The other is the column-redesigned method based on column tree method. Finally, the strategy for achieving the global seismic failure mode based on code-specified requirements was discussed. The present study has great significance on the development of seismic design theory of building structures.