罕遇地震作用下钢筋混凝土框架结构韧性评价

Toughness evaluation of reinforced concrete frame structure under the rare earthquake

为了探究罕遇地震作用下钢筋混凝土框架结构的韧性能力,本研究以钢筋混凝土框架结构为例,利用有限元软件MSC.Marc对其进行动力时程分析,并利用Python提取数据,后处理得到该框架结构在罕遇地震作用下结构构件与非结构构件的损伤状态,以结构的功能损失及恢复时间两个指标对该框架结构进行了韧性评价分析。结果表明:(1)在罕遇地震作用下,该钢筋混凝土框架结构的结构构件和非结构构件都发生了不同程度的破坏,其中底层的梁柱构件破坏最严重,梁完好率为8%,柱的完好率仅为7%。(2)该框架结构对加速度敏感型构件更加友好,在非结构构件中,加速度敏感型完好率高达81.4%,而位移敏感型仅为39.2%。(3)以基于损失指数与功能损失为指标的新计算方法定义结构的功能损失,并采用Redi方法计算出非结构构件修复时间为53d,结构构件的修复时间为19d。由恢复路径曲线总结出非结构构件对整个钢筋混凝土框架结构的韧性起着决定性作用。

In order to explore the toughness of reinforced concrete frame structure under the rare earthquake,reinforced concrete frame structure is taken as an example and the finite element software MSC. Marc is used in this paper to have dynamic time-history analysis. The data are extracted by Python and post processed to get the damage state of structural and non-structural components under the rare earthquake. The toughness of the frame structure is evaluated and analyzed by two indexes of structural function loss and recovery time. The results show that:( 1) The structural and non-structural components of the reinforced concrete frame structure are damaged to different degrees under the rare earthquake. Among them,the beam-column components at the bottom layer are the most damaged with the beam intact rate and column intact rate of only 8% and 7% respectively.( 2) The frame structure is more friendly to acceleration-sensitive components. Among non-structural components,the intact rate of acceleration-sensitive is as high as 81. 4%,while that of displacement-sensitive type is only 39. 2%.( 3) The new calculation method which is based on the loss index and function loss is used to define the function loss of structure. According to the method Redi,the repair time of non-structural components is 53 days,and the repair time of structural components is 19 days. It is concluded from the curve of recovery path that non-structural components play a decisive role in the toughness of the whole reinforced concrete frame structure.