T形型钢混凝土柱-钢梁节点滞回特性研究

Study on hysteretic behavior of T shaped joints composedby SRC column-steel beam

为更好地研究T形型钢混凝土(SRC)柱-钢梁构件的抗震性能,基于已有Bouc-Wen模型,结合课题组前期试验结果,对节点试件的滞回特性进行了分析,将试件骨架曲线简化为三折线形模型,通过将Bouc-Wen模型中关键参数的再次定义,建立了适用于T形SRC柱-钢梁节点的连续曲线形滞回模型。随后采用遗传算法对模型的相关参数进行识别和求解,基于回归分析方法建立了构件设计参数与滞回模型参数之间的函数关系表达式。最后,通过与试验结果的对比分析,对节点滞回模型的有效性进行了验证。结果表明:所建模型能够较好地描述T形型钢混凝土柱-钢梁节点在反复荷载作用下的滞回特性,研究结果可为该类结构抗震计算分析提供理论支撑。

In order to study the seismic performance of T shaped steel concrete(SRC)column-steel beam members,the hysteresis behavior of joint specimens was analyzed based on the existed Bouc-Wen model.Combining with the results of previous experiment results,the skeleton curve of the specimens was simplified to a trilinear linear model,and a continuous hysteresis model for T shaped SRC column-steel beam joints was established by redefining the key parameters in the Bouc-Wen model.Subsequently,a genetic algorithm was used to identify and solve the relevant parameters of the model,and the expression of the functional relationship between the member design parameters and the hysteresis model parameters was established by the regression analysis method.Finally,the comparison between the numerical calculation results and the experimental results shows that the proposed model can better describe the hysteresis behavior of T shaped steel-concrete column-steel beam joints under repeated cyclic loading.The research results can provide theoretical support for the seismic calculation and analysis of composite structures.