基于变形和能量双重准则的型钢混凝土异形柱地震损伤行为研究

Deformation and energy-based seismic damage behavior of SRC specially shaped columns

为了研究型钢混凝土(SRC)异形柱地震损伤的评估机制,首先根据17个SRC异形柱抗震性能试验实测数据,建立该类结构柱基于性态的抗震设计量化指标;之后采用基于变形和能量的双重准则,结合异形柱结构的力学特性,通过引入组合系数的办法提出了适用于SRC异形柱抗震性能演化的Park-Ang修正模型。研究结果表明,型钢混凝土异形柱抗震性态水平可划分为5个等级,依次为正常使用、暂时使用、修复后可使用、生命安全和防止倒塌;在满足84.13%的概率保证率下各水平的柱构件位移角限值分别为1/700、1/150、1/100、1/50和1/35;提出的修正Park-Ang损伤模型能较好地反映型钢混凝土异形柱地震损伤的演变规律;通过控制损伤阀值,明确了型钢混凝土异形柱在各性态水平下的地震损伤评估依据。

This paper focuses on the seismic damage assessment mechanism of SRC specially shaped columns. The seismic design quantitative indexes based on the performance were firstly established via the seismic test results of 17 specimens. Based on the dual criteria of deformation and energy, the Park-Ang model was modified and proposed by introducing the combination coefficient to analyze the seismic performance evolution of SRC specially shaped columns with considering the mechanical characteristics of specially shaped column structures. The results show that the seismic performance levels of SRC specially shaped columns can be divided into five grades, including regular service, temporary service, service after repairing, life safety and prevent collapse. Under the probabilistic reliability of 84. 13%, the column displacement angle limits of SRC specially shaped columns at the corresponding 5 performance levels were 1/700, 1/150, 1/100, 1/50 and 1/35, respectively. The modified Park-Ang damage model can reflect the seismic damage evolvement rule of SRC specially shaped columns well. The earthquake damage assessment basis for SRC specially shaped columns under different performance levels is made clearly by controlling the damage threshold.