施工误差对剪力钉工作性能的影响

Influence of Construction Error on Working Performance of Shear Stud

为了研究施工误差对剪力钉工作性能的影响,通过3个无误差剪力钉推出试验,探究剪力钉抗剪力学性能,并根据试验结果验证有限元模拟方法的准确性。在此基础上,考虑施工过程中可能发生的混凝土浇筑不密实、剪力钉布置边距不足、剪力钉倾斜3种施工误差,通过有限元模拟计算分析得到在各施工误差影响下剪力钉抗剪承载力及破坏模式。结果表明:无误差试件剪力钉破坏模式均为剪力钉根部剪断破坏,抗剪承载力试验值均大于各规范计算值;有限元分析得到剪力钉附近混凝土浇筑不密实可使剪力钉抗剪承载力降低60%~70%;剪力钉至混凝土边缘距离不满足规范要求可使剪力钉抗剪承载力降低27%;剪力钉倾斜可使剪力钉抗剪承载力降低41%;混凝土浇筑不密实对剪力钉抗剪承载能力影响最大。

In order to study the influence of construction error on working performance of shear studs,through push-out test on three shear stud specimens without error to explore the shear mechanical properties of shear stud,meanwhile,according to the test results,the accuracy of the finite element method was proved.On this basic,considering the non-compactness concrete pouring,insufficient margin of shear stud layout and incline of shear stud in process of construction,and through the finite element simulation and analysis,shear capacity and failure modes of the shear stud under construction error were gained.The results indicate that the failure modes of shear studs without error are all shear failure in the shear stud root,the test values of shear capacity are greater than the calculated values of specifications.The finite element analysis results show that non-compactness concrete pouring near shear stud decreases shear bearing capacity by 60%-70%,insufficient margin of shear stud layout without meeting specifications decreases shear bearing capacity by 27%,and incline of shear stud decreases shear bearing capacity by 41%.The non-compactness concrete pouring is the greatest influence on the shear capacity of shear stud.