不同轴压比下纤维增强水泥基复合材料加固砌体墙抗震性能数值模拟研究

Numerical simulation study on seismic performance of ECC reinforced masonry wall under different axial compression ratios

纤维增强水泥基复合材料(ECC)被广泛应用于砌体墙的加固中,其加固效果受到墙体轴压比的影响。通过对未加固砌体墙进行模拟并进行模型的可靠性验证,对在0.1、0.3、0.5轴压比下的未加固砌体墙和ECC加固砌体墙进行模型设置,施加模拟地震作用的边界条件,最后对模拟结果的破坏模态、滞回曲线、骨架曲线和累积耗能进行对比分析,研究不同轴压比对ECC加固砌体墙的抗震性能的影响。结果表明,当轴压比分别为0.1、0.3、0.5时,ECC加固墙体所能承受的水平峰值荷载较未加固墙体分别提高了33.78%、26.45%、21.97%,说明ECC加固能够显著提高砌体墙的抗震性能并延缓其破坏过程。

Fiber-reinforced cementitious composites(ECC)are widely used in the reinforcement of masonry walls,but their reinforcement effect is affected by the axial compression ratio of the wall.Through numerical simulation,the seismic performance of ECC reinforced masonry wall under different axial compression ratios is studied.Firstly,the unreinforced masonry wall model is modeled and the reliability of the model is verified,followed by numerical modeling of unreinforced masonry wall and ECC reinforced masonry wall under 0.1,0.3,0.5 axial compression ratios,and boundary conditions for simulated seismic action are applied,and finally the failure mode,hysteresis curve,skeleton curve and cumulative energy consumption of the simulation results are compared and analyzed.The results show that when the axial compression ratios are 0.1,0.3,0.5,respectively,the horizontal peak load that can be borne by the ECC reinforced wall is increased by 33.78%,26.45%,21.97%compared with the unreinforced wall,and ECC reinforcement can significantly improve the seismic performance of the masonry wall and delay its failure process.