基于性能冗余率的震损混凝土结构残余抗震性能评价

Residual seismic capacity evaluation of earthquake damaged RC structures based on seismic capacity redundancy

提出了一种震损钢筋混凝土结构残余抗震性能详细评价方法,该方法克服了以日本规范为代表的现有评价方法在应用于同时包含剪切破坏和弯曲破坏构件的复杂破坏模式结构时存在的局限性。该方法基于结构静力推覆分析和结构性能冗余率,能够更详细地考虑构件损伤造成的多方面的性能变化,并且能够判定复杂破坏模式结构的破坏类型及安全界限。以一栋实际震损结构作为工程实例,采用详细评价方法和日本规范评价方法研究其残余抗震性能。结果表明:详细评价方法对于复杂破坏模式结构的评价结果更合理准确;对于脆性破坏型结构,日本规范的评价结果与详细评价方法差别不大,而对于延性破坏型结构,日本规范的评价结果误差较大;另外,通过合理设置构造缝以保证构件的延性,能够显著提高结构震后的残余抗震性能。

A detailed evaluation method for residual seismic capacity of seismic damaged reinforced concrete(RC)building structures was proposed in this paper.This method overcomes the limitation of the existing methods,represented by the Japanese code,when applied on the structures composed of both shear failure and flexural failure structural elements(dual-failure mode structures).Based on pushover analysis and seismic capacity redundancy index of the structure,the proposed method can more comprehensively consider various performance changes due to the damage of the elements,and can determine the dominant failure mode and safety limit of the structures with dual-failure mode.By taking a real seismic damaged structure as example,the detailed method and the method of Japanese code were used to investigate its residual seismic capacity.It is found that the detailed method is more accurate for the structures with the dual-failure mode.For the structures dominated by the brittle failure mode,the prediction from the Japanese code is close to that from the detailed method.Nevertheless,for the structures dominated by the ductile failure mode,error of the Japanese code is considerable.In addition,by reasonably setting the construction slits to ensure the ductility of elements,the structural residual seismic capacity after the earthquake can be enhanced significantly.