摩擦型多排高强度螺栓连接分析

Study on Connection of Friction-typed Multiple-row High-strength Bolt

研究目的:为了明确摩擦型多排高强度螺栓连接传力性能、接头折减系数和极限状态,通过模型试验、接触单元有限元计算和理论分析进行相关的研究。研究结论:研究结果表明:摩擦型多排高强度螺栓连接各栓传力特性取决于外荷载、接触面状况、等效截面刚度等因素,多排螺栓连接的承载能力极限状态以首尾两排螺栓处芯板与拼接板接触面上滑移量达螺栓与栓孔间的设计空隙值、头排螺栓承剪孔壁承压作为判定指标;长列摩擦型高强度螺栓接头头尾排螺栓传力比最大;实桥栓接节点极限承载力满足设计要求。

Research purposes： In order to clarify the connection transmission performance, the joint reduction factor and the limit condition of the friction - type multiple - row bolt, the relative study was done by doing the model test and making the finite element calculation and theoretical analysis for contact element. Research conclusions： The results showed that the connection transfer force characteristics of the friction - typed multiple- row bolt depended on the external load, the contact surface condition and the equivalent cross - section stiffness. The slippage between the core plate at the front and end rows bolts and the contact surface of the splicer, the design gap value between the bolt and keyhole and the load bearing capacity of the shear - loaded hole wall were considered as the criterion for the limit condition of the load bearing capacity of the connection of the multiple - row bolt. The force transmission ratio of of the joint bolts on the front and rows of long - row friction - typed high - strength bolt was the biggest. The limit load bearing capacity of the node of real bridge met the design requirement.