采用高强钢棒的混凝土短肢剪力墙抗震性能评估

SEISMIC PERFORMANCE EVALUATION OF CONCRETE SHORT-LEG SHEAR WALL WITH HIGH-STRENGTH STEEL BARS

  • 摘要: 为促进可恢复性结构发展,推动低粘结高强钢筋—高强钢棒在建筑结构中的应用,提出了一种以高强钢棒作为暗柱纵筋的混凝土短肢剪力墙。设计并完成了4片剪跨比为2的1/3缩尺短肢剪力墙的拟静力试验,对比分析了暗柱纵筋类型、轴压比和碳纤维布约束塑性铰区等参数对混凝土短肢剪力墙抗震性能的影响,并着重探讨了试件的承载能力和变形能力。结果表明:高强钢棒作为混凝土短肢剪力墙的暗柱纵筋,可实现混凝土短肢剪力墙在大变形下承载力随着侧向位移的增加而提高,且具有较小的残余变形,破坏形态均以弯曲破坏为主;在高轴压比作用下,碳纤维布约束塑性铰区可提高采用高强钢棒的混凝土短肢剪力墙的承载能力。基于NewRC模型计算的采用高强钢棒的钢筋混凝土短肢剪力墙抗弯承载力与试验结果吻合较好。各试件塑性铰区的弯曲变形与整体变形的比值基本保持恒定不变。

     

    Abstract: To promote the development of resilient structures and encourage the application of low-bond high-strength steel bars in building structures, a concrete short-leg shear wall with high-strength steel bars for the concealed column longitudinal reinforcement is proposed. Four 1/3-scale short-leg shear wall specimens with a shear-span ratio of 2 were designed and subjected to the quasi-static tests. Analyzed and compared was the influence of parameters such as the type of concealed column longitudinal reinforcement, axial compression ratio, and the plastic hinge area reinforced by carbon fiber on the seismic performance of concrete short-leg shear walls, and explored were the bearing and deformation capacities of the specimens. The focus was primarily on the bearing capacity and deformation capacity of the specimens. The results show that: using high-strength steel bars as the longitudinal reinforcement of concealed columns in concrete short-leg shear walls can achieve an increase in the bearing capacity with an increase in lateral displacement under large deformations, with a small residual deformation and a bending failure mode. Under high axial compression ratios, when the plastic hinge area reinforced by carbon fiber, the bearing capacity was effectively improved. The bending capacity of reinforced concrete short-leg shear walls with high-strength steel bars calculated upon the NewRC model agrees well with experimental results. The ratio of bending deformation to overall deformation in the plastic hinge area of each specimen basically remained constant.

     

/

返回文章
返回