基于改进Park-Ang双参数模型的RCS混合框架结构地震损伤评估

为了评估钢筋混凝土柱-钢梁混合框架结构在地震中的损伤程度,基于Park-Ang双参数地震损伤模型,通过修正相关参数,建立了适用于RCS混合框架结构的地震损伤模型。通过分析楼板对模型关键参数的影响,给出了考虑楼板影响的组合梁构件极限变形计算公式,并对其有效性进行了验证;基于试验结果,通过使构件破坏点损伤指数等于1的方法进行反演,得到组合梁构件循环荷载影响参数β。给出了结构不同破坏程度对应的损伤指数范围,并提出了该种结构的地震损伤评估方法。对一栋4层RCS混合框架结构在El-Centro波作用下的损伤程度进行评估,结果表明:该文提出的地震损伤模型能够比较好地反映RCS混合框架结构的损伤演化过程与程度,研究结果为RCS混合框架结构的地震损伤评估与基于性能的抗震设计方法提供了理论依据。

SEISMIC DAMAGE ASSESSMENT OF COMPOSITE FRAME WITH REINFORCED CONCRETE COLUMNS AND STEEL BEAMS BASED ON IMPROVED PARK-ANG DOUBLE PARAMETER MODEL

To evaluate the damage degree of Composite Frame with Reinforced Concrete Column and Steel Beam after the earthquake, the seismic damage model of RCS composite frame structure was established by modifying the relevant parameters of the Park-Ang double parameter seismic damage model. By analyzing the influence of the slab on the key parameters of the model, the formula to calculate the ultimate deformation capacity of the composite beam members under the influence of the slab space combination effect was given. The formula was verified. Based on the test results, the parameter β under the influence of cyclic loading of the composite beam member was obtained by inverting the component at a damage index equal to 1 at the point of failure. The range of damage index corresponding to the degree of damage of the structure was given, and a seismic damage assessment method for this structure was proposed. The seismic damage assessment of a 4-layer RCS composite frame structure under the action of El-Centro wave shows that the seismic damage model proposed in this paper can better reflect the damage evolution process and degree of RCS composite frame structure. The research results provide a theoretical basis for seismic damage assessment and performance-based seismic design of RCS composite frame structures.