超高韧度水泥基修复剪力墙试验的数值分析

Numerical Analysis on Damaged Reinforced Concrete Shear Wall Repaired with Engineered Cementitious Composites

摘要:

采用扩展有限元方法（XFEM）与内聚力裂缝模型相结合，模拟超高韧度水泥基(ECC)修复震损剪力墙中混凝土和ECC材料内部的裂缝开展，以及界面裂缝在ECC与混凝土界面之间开展的力学行为，并在此基础上数值再现了原有钢筋混凝土墙体及修复后墙体在侧向荷载作用下的反应.结果表明：将扩展有限元方法与基于界面的内聚力模型相结合，可较好地模拟有黏结界面的修复后剪力墙的受力行为，有限元模拟计算结果的极限承载力和相应位移与试验结果吻合良好.

Abstract:

The extended finite element method (XFEM) combined with cohesive zone model was adopted for numerical analysis on seismic damaged reinforced concrete （RC） shear wall repaired with engineered cementitious composites (ECC). The simulation focused on the crack initiating and propagating in concrete and ECC and interfacial fracture between concrete and ECC. Based on that, the mechanical behaviors of the original RC wall and repaired wall were modeled for the seismic performance under lateral loads. It is shown that the method can well simulate the mechanical behaviors of the repaired shear wall with bonded interface, and numerical analysis results have a good agreement with test results in ultimate bearing capacity.