徐龙河, 敬祺轲, 谢行思. 主余震下自复位支撑RC框架结构性能研究[J]. 工程力学, 2023, 40(5): 117-124. DOI: 10.6052/j.issn.1000-4750.2021.10.0824
引用本文: 徐龙河, 敬祺轲, 谢行思. 主余震下自复位支撑RC框架结构性能研究[J]. 工程力学, 2023, 40(5): 117-124. DOI: 10.6052/j.issn.1000-4750.2021.10.0824
XU Long-he, JING Qi-ke, XIE Xing-si. PERFORMANCE STUDY ON RC FRAME STRUCTURES WITH SELF-CENTERING BRACES UNDER MAIN- AND AFTER-EARTHQUAKES[J]. Engineering Mechanics, 2023, 40(5): 117-124. DOI: 10.6052/j.issn.1000-4750.2021.10.0824
Citation: XU Long-he, JING Qi-ke, XIE Xing-si. PERFORMANCE STUDY ON RC FRAME STRUCTURES WITH SELF-CENTERING BRACES UNDER MAIN- AND AFTER-EARTHQUAKES[J]. Engineering Mechanics, 2023, 40(5): 117-124. DOI: 10.6052/j.issn.1000-4750.2021.10.0824

主余震下自复位支撑RC框架结构性能研究

PERFORMANCE STUDY ON RC FRAME STRUCTURES WITH SELF-CENTERING BRACES UNDER MAIN- AND AFTER-EARTHQUAKES

  • 摘要: 基于地震动峰值和频谱,提出了一种适用于地震工程领域、流程简单的主余震序列构造方法,构造出7条主余震序列地震动。对一12层的预压碟簧自复位耗能(PS-SCED)支撑RC框架结构在主余震下的抗震性能进行分析,并与防屈曲支撑(BRB)结构进行对比。结果表明:两种支撑都具有稳定的滞回性能,且滞回环饱满;PS-SCED支撑还具备良好的自复位特性,PS-SCED支撑结构最大残余位移角比BRB结构减小74.7%;在主余震序列作用下,PS-SCED支撑结构的顶层残余位移角和结构耗能比仅主震作用下的值增大,最大增幅为35.3%和19.6%。余震会使结构的耗能和损伤增加,PS-SCED支撑能够显著提高RC框架结构的抗震性能。

     

    Abstract: Based on the peak value and frequency spectrum of ground motion, a method for the construction of main and aftershock sequences, which is suitable for seismic engineering, with a simple process is proposed, and 7 main and aftershock sequences are constructed. The seismic performance of a 12-storey pre-pressed self-centering energy dissipation (PS-SCED) braced reinforced concrete (RC) frame structure under the main and aftershocks is studied and compared with a buckling restrained (BRB) braced structure. The results show that both braces have stable hysteretic properties and full hysteretic loops. The PS-SCED brace also has good self-centering characteristics, and the maximum residual drift ratio of a PS-SCED braced structure is 74.7% less than that of a BRB braced structure. Under the action of the main and aftershock sequences, the residual drift ratio of the top floor and the structural energy dissipation of the PS-SCED braced structure increase compared with the values only under the action of the mainshock, and the maximum increments are 35.3% and 19.6%, respectively. Aftershocks increase the energy dissipation and damage of structures. The PS-SCED braces can significantly improve the seismic performance of RC frame structures.

     

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