栓钉剪力连接件滑移性能试验研究及受剪承载力计算

Experimental study on slip behavior and calculation of shear bearing capacity for shear stud connectors

根据3组栓钉剪力连接件推出试验,研究栓钉直径和栓钉屈服强度对试件受剪承载力的影响。应用ABAQUS有限元分析软件对栓钉剪力连接件进行精细三维实体有限元分析,栓钉、钢梁和混凝土均采用C3D8R单元,计算结果与试验结果符合较好。基于有限元法进行参数分析,研究栓钉直径、数量、长径比、屈服强度、混凝土强度和横向配筋率等对栓钉剪力连接件荷载-滑移性能的影响,有限元计算结果表明,栓钉受剪承载力随着栓钉直径、屈服强度和混凝土强度的增大而提高。提出了考虑栓钉直径、屈服强度和混凝土强度影响的单个栓钉受剪承载力计算式和荷载-滑移关系计算方法,计算结果与文中试验结果和收集到的81组栓钉剪力连接件有效试验结果进行对比,吻合较好。建议的受剪承载力计算式与现行规范建议公式进行比较,建议的计算式具有较高的精度。荷载-滑移曲线实用计算方法与Ollgaard提出的计算方法比较表明建议计算方法具有较广泛的适用性。

This paper presents a push-out experimental study of three groups of shear stud connectors to investigate the impact of the shear stud diameter and yield strength on shear stud bearing capacity. ABAQUS was used to establish the3 D finite element model and to analyze the behavior of shear stud connectors. The headed studs,steel beam and concrete were meshed with solid element C3D8 R. The calculated results are in good agreement with the experimental results. Based on ABAQUS parametric analysis,the influences of the significant parameters,such as the diameter,number,length to diameter ratio,and yield strength of stud,transverse reinforcement ratio and concrete strength on the load-slip relationship of shear stud connectors were discussed,which showed that the shear stud bearing capacity was improved with the increase of stud diameter,yield strength of stud and concrete strength. And the practical calculation formula for shear capacity and the practical calculation method of load-slip relationship for single stud in shear connectors were presented,which were mainly influenced by the diameter and yield strength of stud,and concrete strength. The calculating results presented by authors and the other investigators were compared with the test results of 81 specimens at home and abroad. The calculated results show that practical calculation formula presented by authors give reasonable agreement with the experimental results. The practical calculation formula of shear capacity was compared with the formula recommended by current specification,showing that the proposed formula has higher accuracy. The comparison between the practical calculation method of load-slip relationship and the method proposed by Ollgaard shows that the proposed method has more extensive applicability.