钢板开缝对钢板混凝土组合剪力墙早期抗裂性能的影响研究

Study on the Influence of Steel Plate Slotting on Early Cracking Resistance of Steel Plate Reinforced Concrete Shear Wall

针对钢板混凝土组合剪力墙早期开裂问题,研究了钢板开缝对组合剪力墙早期抗裂性能的影响。首先基于截面约束应变分布假定,推导了开缝钢板混凝土组合剪力墙在等温荷载作用下的混凝土约束应变近似计算公式。然后采用有限元分析方法,通过实例分析对比验证了近似公式的可用性。综合近似公式和有限元分析得出了在等降温荷载作用下,钢板开缝使得混凝土约束拉应变内增外减,缝间距或缝间钢板长度一定时,缝宽越大,内增外减效应越明显。最后通过分析和讨论得出,在一定条件下,通过对钢板开缝,能够提高钢板混凝土组合剪力墙的早期抗裂性能。

In view of the early cracking problem of the steel plate reinforced concrete shear wall,the influence of steel plate slottingon the early crack resistance of the composite shear wall was studied.Firstly,based on the assumption of sectional constraint strain distribution,the approximate calculation formula of concrete constraint strain of the steel plate slottingreinforced concrete shear wall under isothermal load is derived.Then,the finite element analysis method is used to verify the availability of the approximate formula by example analysis and comparison.Through approximate formula and finite element analysis,it isshowed that under the negative isothermal load,slotting steel plate would increase the tensile strain of internal concrete and decrease the external,and when the length betweencenters of slots or the length of the steel plate is fixed,the larger the seam spacing is,the more obvious the internal increasing and external decreasing effect would be.Finally,through analysis and discussion,it is concluded that under certain conditions,the early cracking resistance of the steel platereinforced concrete shear wall could be improved by slotting the steel plate.