摩擦型高强度螺栓长接头传力比的计算

CALCULATION OF FORCE TRANSMISSION RATIO OF FRICTION HIGH STRENGTH BOLTS CONNECTIONS

摩擦型高强螺栓连接接头在现代钢桥中的应用越来越广泛,为研究各排螺栓的传力比特性,根据文献试验结果及有限元数值模拟结果,对螺栓的荷载滑移曲线进行了拟合,在此基础上建立了长列螺栓群接头的受力简化模型,由变形协调条件,通过求解静力平衡方程组,提出了各排螺栓传力比理论计算方法。为验证该理论方法的正确性,设计了2组螺栓接头,实测了其螺栓传力比,试验结果表明,该文方法与试验结果吻合良好。最后对影响螺栓传力的各参数进行研究,结果表明:传力比与芯板与盖板的板厚比,螺栓排数,孔间距等均有显著关系,当螺栓排数大于5时,建议首排螺栓传力比取0.389。

High strength bolted friction grip(HSFG)joints are widely used in steel bridges,in order to study the force transmission ratio of HSFG joint,the load-displacement curve of a single bolt was fitted and the mechanical model of long HSFG joint was constructed,based on the reference’s experimental results and finite element analysis.By the grounds of deformation coordination conditions,a theoretical calculation method for the force transmission ratio of each row bolt is proposed through solving the static equilibrium equations.To verify the correctness of the theoretical method,two bolt joints were designed and the force transmission ratio was measured.Experimental results show that the proposed method is in a good agreement with the theoretical results.In the last,parametric analysis is conducted,and the analysis results show that:the force transmission ratio is significantly related to the thickness ratio of the core plate to the cover plate,to the number of bolt rows,to the spacing of bolt hole,and the like.When the number of bolt rows is greater than 5,the force transfer ratio of the first row of bolts is suggested to be 0.389.