外包钢加固SRC框架结构地震损伤演化分析

基于外包钢加固震损型钢混凝土框架结构在低周往复荷载作用下的破坏性试验,采用材料性能折减的方法考虑震损影响,对外包钢加固损伤的型钢混凝土框架结构进行有限元建模分析,利用改进的双参数地震损伤模型计算其主要构件和整体结构的损伤指数,并利用多项式函数对其构件及整体结构的损伤演化曲线进行拟合,探讨外包钢加固震损型钢混凝土框架结构在低周往复荷载作用下的损伤演化规律。结果表明,通过折减材料性能来模拟预震损的方法是合理的;改进的地震损伤模型能定量计算结构在各个循环阶段的损伤指数;外包钢加固型钢混凝土框架结构的方法能有效降低型钢混凝土框架结构地震损伤程度,与未加固的震损型钢混凝土框架结构相比,外包钢加固震损型钢混凝土框架结构的抗震性能明显增强。

Seismic damage evolution analysis of SRC frame structure reinforced by enveloped steel

Based on the destructive test of seismically damaged steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads, considering the effect of seismic damage by adopting the method of material performance reduction, the finite element models of steel reinforced concrete frame structures strengthened by enveloped steel were established and analyzed, and the damage indexes of their main components and the whole structure were calculated by using the improved two-parameter seismic damage model, while the damage evolution curves of the components and the whole structure were fitted by polynomial function to discuss the damage evolution law of steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads. The results show that it is an effective and feasible method to consider the seismic damage on the mechanical behavior of frame structures by reducing material properties. The improved seismic damage model can quantitatively calculate the damage index of the structure at each cycle. The seismic damage degree of steel reinforced concrete frame structures can be effectively reduced by the method of strengthening by enveloped steel, and compared with the unstrengthened steel reinforced concrete frame structures, the seismic performance of steel reinforced concrete frame structures strengthened by enveloped steel is obviously enhanced.