高阻尼混凝土带暗支撑剪力墙抗震性能试验研究

Experimental study on seismic performance of high damping concrete shear wall with concealed bracings

为了改善普通带暗支撑剪力墙的抗震性能,本文尝试将高阻尼混凝土代替普通混凝土应用于剪力墙中,同时提出了一种改善低剪力墙延性的新型配筋方案。为了准确把握这些新型带暗支撑剪力墙的抗震性能,共完成了6片不同形式剪力墙的低周反复加载试验,得到了各种剪力墙在低周往复荷载作用下的破坏模式、承载力、滞回曲线、刚度退化和耗能能力等抗震性能指标,考察了剪跨比、轴压比对剪力墙抗震性能的影响,论证了高阻尼混凝土带暗支撑剪力墙与新型低剪力墙配筋方案的可行性。试验结果表明:与普通混凝土带暗支撑剪力墙相比,高阻尼混凝土带暗支撑剪力墙的阻尼比、变形能力和耗能能力均有较大幅度提高,后期刚度稳定性更好;与普通带暗支撑低剪力墙相比,新型配筋低剪力墙的延性和耗能能力显著提高,具有良好的承载力,滞回环更饱满,抗震性能得到显著改善。

In order to improve the seismic performance of common concrete shear wall with concealed bracings, high damping concrete instead of ordinary concrete is applied to the shear wall as described in this paper. In the meantime, a new reinforcement scheme for improving the ductility of low shear-span ratio shear wall is putted for- ward. In this paper, the experimental study on the seismic performance of six different types of shear walls under cyclic loading is carried out, and also the failure characteristics, bearing capacity, ductility , hysteretic curve, stiff- ness attenuation and energy dissipation performance of the proposed shear wall are analyzed systematically. Based on the experimental study, the influence of axial-load ratio and shear-span ratio on the seismic performance of shear wall is discussed, and the application of high damping concrete shear wall with concealed bracings and the feasibili- ty of low-rise shear wall reinforcement scheme are demonstrated. The test results indicate that compared with the common concrete shear wall with concealed bracings, the damping ratio, the deformability and the energy dissipa- tion capacity of high damping concrete shear wall with concealed bracings are increased obviously, and the stability of their stiffness at later stages is much better. It is also shown that compared with the low-rise shear wall with com- mon reinforcement scheme, the new type of low-rise shear wall shows better ductility and energy dissipation capaci- ty, adequate bearing capacity, plumber hysteretic loops and good seismic performance