边框钢纤维混凝土剪力墙抗震性能研究

Study on Seismic Performance of Shear Walls with Steel Fiber Reinforced Concrete in Boundary Elements

针对剪力墙约束边缘构件受力复杂、施工困难的特点,提出了在剪力墙约束边缘构件中采用钢纤维局部增强的方法来改进其抗震性能,并将其命名为边框钢纤维混凝土剪力墙.结合试验结果和有限元数值模拟,研究了钢纤维体积率和剪跨比对边框钢纤维混凝土剪力墙承载力、位移和延性的影响,并与整体钢纤维混凝土剪力墙相应的抗震性能进行了对比分析.结果表明,在剪力墙约束边缘构件内掺加钢纤维对于剪力墙结构的承载力和延性均具有一定的提升效果,其中位移延性最大可提升约102.8%.相对于整体钢纤维混凝土剪力墙,采用边框钢纤维混凝土剪力墙具有较大的经济优势,而且并未牺牲整体钢纤维剪力墙太大承载力和位移延性.

In view of the construction difficulty and complex stress state of boundary elements,a method using steel fiber reinforced concrete in boundary elements is proposed to improve the seismic performance of shear wall.Combined with test results and finite element numerical simulation,the influence of steel fiber volume ratios and aspect ratios is studied on the bearing capacity,displacement and ductility of this kind of shear wall,which are comparatively analyzed with the corresponding seismic performance of the overall steel fiber reinforced concrete shear wall.The results show that the utilization of steel fiber reinforced concrete in boundary elements can desirably improve the bearing capacity and ductility of shear wall structures,especially in which the displacement ductility can be increased by 102.8%.Compared with the overall steel fiber reinforced concrete shear wall,the shear wall with steel fiber reinforced concrete only in boundary elements is of great economy without sacrificing bearing capacity and ductility.