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为了研究型钢高强混凝土剪力墙的抗震性能,对8个剪跨比为2.5的剪力墙试件进行了拟静力试验。通过改变试件的轴压比、配箍特征值和配钢率,研究其在往复水平荷载作用下的破坏机理、滞回性能、变形能力以及耗能能力。试验结果表明,这种剪力墙的破坏形态为墙底部截面约束区混凝土被压碎的弯曲型破坏;试件的滞回曲线饱满,没有明显的捏缩现象;位移延性系数在3.50～4.66之间,并且随着配箍特征值和配钢率的增加,试件的变形能力提高;等效粘滞阻尼比在0.196～0.255之间,试件表现出较好的耗能能力。根据墙体在不同阶段的破坏程度,将型钢混凝土剪力墙结构的性能划分为使用良好、保证人身安全和防止倒塌三个性能水平,提出用位移角作为型钢混凝土剪力墙结构的性能指标,并给出了不同性能水平位移角限值的建议值。
In order to study the seismic behavior of steel reinforced high-strength concrete shear walls, quasi-static tests were carried out on eight shear wall specimens with a shear-span ratio of 2.5. By changing the axial compression ratio, the characteristic value of hoop and the steel ratio, the failure mechanism, hysteretic capacity, deformation capacity and energy dissipation capacity under reciprocating horizontal load were studied. The test results show that the failure mode of this shear wall is the bending failure of the concrete crushed in the restraint area of the bottom of the wall; the hysteresis curve of the specimen is full and there is no obvious pinch-shrink phenomenon; the displacement ductility coefficient is 3.50 ~ 4.66 And the deformation capacity of the specimen increases with the increase of the characteristic value of the bail and the steel ratio. The equivalent viscous damping ratio is between 0.196 and 0.255, and the specimen shows better energy dissipation capacity. According to the damage degree of the wall in different stages, the performance of the SRC structure is divided into three performance levels that are well used, personal safety and collapse prevention. The displacement angle is taken as the performance index of the SRC structure. The suggested values of the displacement angle limits at different performance levels are given.