绿色纤维局部增强装配整体式混凝土剪力墙数值模拟分析

Numerical simulation analysis of recycled steel fiber locally reinforced monolithic precast concrete shear wall

为了提高装配整体式混凝土剪力墙的抗震性能,响应“绿色低碳”政策的号召,基于装配整体式混凝土剪力墙模型的数值模拟,对比试验数据,验证了数值模拟的合理性,研究了在低周反复荷载作用下,绿色纤维(从废旧轮胎中提取的回收钢纤维制备而成的绿色纤维)体积率对装配整体式混凝土剪力墙的承载能力、延性性能和耗能性能的影响,计算出各模型的位移延性系数和耗能系数。模拟结果表明,绿色纤维能够明显改善装配整体式混凝土剪力墙的抗震性能,绿色纤维的加入使模型的滞回曲线更加饱满,滞回环的面积更大。随着绿色纤维体积率的增大,模型的承载能力、延性性能和耗能性能也逐渐增大,当绿色纤维体积率达到1.5%时,模型的承载能力、延性性能和耗能性能提升最为明显。

In order to improve the seismic performance of monolithic precast concrete shear wall and follow the Green and low-carbon policies,based on the numerical simulation of the monolithic precast concrete shear wall model,after comparing with the experimental data,the rationality of the numerical simulation was verified.Meanwhile,the effects of volume ratio of the recycled steel fiber(made from recycled steel fiber extracted from the waste tires)on the bearing capacity,ductility and energy dissipation of monolithic precast concrete shear walls were studied under the low cyclic loading.The displacement ductility coefficient and energy dissipation coefficient of each model were obtained.The results of the finite element simulation showed that the seismic performance of the monolithic precast concrete shear wall was significantly improved because of the recycled steel fiber.The hysteresis curve of the model is fuller and the area of the hysteresis loop is larger when the recycled steel fiber was added.With the increase of recycled steel fiber volume ratio,the bearing capacity,ductility and energy dissipation performance of the models also increased gradually.The bearing capacity,ductility and energy dissipation performance of the model were improved most obviously when the volume ratio of recycled steel fiber was 1.5%.