摘要
分析24片以剪切破坏为主的双钢板混凝土组合剪力墙的低周反复加载试验结果表明,剪切破坏以腹部混凝土斜压杆压碎或表面钢板拉断为破坏特征,无轴压力作用时,墙体腹部混凝土形成45°交叉斜裂缝,表面钢板发生45°剪切屈曲;轴压力可提高墙体的斜截面承载力;当剪跨比小于0.85时,随剪跨比减小,墙体受剪承载力增大,当剪跨比大于0.85时,剪跨比的变化对墙体受剪承载力影响不大。在此基础上,提出了该类组合剪力墙斜截面承载力计算的交叉斜杆模型,即当墙体达到极限状态时,钢板可视为45°分布式斜拉杆,混凝土可视为45°分布式斜压杆,拉压杆相互垂直。进而推导了组合剪力墙斜截面承载力的计算公式,并通过拟合试验结果,考虑轴压力对组合剪力墙斜截面承载力的影响。公式计算结果与试验结果吻合良好。
The low cycle loading experiments of 24 steel-concrete composite shear walls( hereafter referred as SC shear walls) dominated by shear failure were analyzed,and results show that the shear failure of SC shear walls is characterized by the crush of the diagonal concrete struts in compression or the fracture of the diagonal steel stripes in tension; in the absence of axial load,the web concrete cracks at an angle of 45°,and the buckling of the surface steel plates occurs at an angle of 45°; the axial load enhances the shear capacity of SC shear walls; as the shear-span ratio is smaller than 0. 85,the reduction of the shear-span ratio increases the shear capacity,and when the shear-span ratio is greater than 0. 85,the increase of shear-span ratio has little influence on the shear capacity. In this paper,a strut and tie mechanism for calculating shear capacity of SC shear walls without axial load is proposed,assuming the steel plates as tensile stripes and the concrete as compressive struts at an angle of 45°,respectively. Based on this model,the equation for shear capacity of SC shear walls is derived,and the influence of axial load is considered. And the form of the equation is in consistency with the equations in the Chinese codes for other kinds of shear walls.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第6期145-150,共6页
Journal of Building Structures
基金
北京市自然科学基金项目(8142026)
