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为了快速评估建筑结构的抗地震倒塌能力,该文基于Adam等提出的等效单自由度模型,首先用Pushover分析方法对纤维增强混凝土(FRC)结构进行静力弹塑性分析,获得其基底剪力-顶点位移曲线,据此确定其力-变形关系;然后根据力-变形关系以及侧向位移形状函数,确定相应的等效单自由度模型的相关参数;按等效单自由度模型计算结构的抗地震倒塌能力。分别对某8层钢筋混凝土框架结构和FRC框架结构进行分析。结果表明:用与多自由度结构相应的等效单自由度模型评估FRC框架结构的整体抗地震倒塌能力是可行和偏于保守的;采用抛物线加载模式比倒三角加载模式得到更接近由IDA分析所得的结构抗地震倒塌能力中位值;在其他条件相同时,FRC框架结构比普通混凝土框架结构具有更高的抗地震倒塌能力。
In order to quickly assess the seismic collapse resistance of building structures, based on the equivalent one-degree-of-freedom model proposed by Adam et al., The static elasto-plastic analysis of fiber reinforced concrete (FRC) - vertex displacement curve, and then determine the force-deformation relationship; then according to the force-deformation relationship and lateral displacement shape function, determine the corresponding equivalent single-degree-of-freedom model of the relevant parameters; equivalent single degree of freedom model to calculate the structure Anti-seismic collapse ability. An 8-story reinforced concrete frame structure and FRC frame structure were analyzed respectively. The results show that it is feasible and conservative to evaluate the overall seismic collapse resistance of FRC frame structure by using the equivalent one-degree-freedom model corresponding to multi-degree-of-freedom structure. The parabolic loading model is closer to IDA analysis than the inverted triangular loading model The resulting structure has a median value of resistance to seismic collapse; FRC frame structures have a higher resistance to seismic collapse than ordinary concrete frame structures at other conditions being the same.