主次梁高强螺栓连接节点承载力研究

在主次梁连接螺栓设计计算时,附加弯矩的力臂通常取次梁上螺栓群的形心到主梁腹板中心线的水平距离,这种附加弯矩的计算方法与实际受力状态不符。对实际钢结构工程中有代表性的主次梁高强螺栓连接节点进行承载力试验研究,探讨主次梁连接螺栓节点的屈服荷载、极限承载力和极限变形能力。同时,采用有限元软件对多种类型的主次梁高强螺栓连接形式的模型进行考虑接触单元的非线性分析,将试验结果、有限元计算结果与常规分析方法计算结果进行对比,提出主次梁连接螺栓承载力设计计算时更为合理的偏心距取值方法,计算结果与试验和有限元分析结果吻合良好。

ANALYSIS OF SHEAR CAPACITY OF BEAM-AND-GIRDER BOLT CONNECTIONS

During the design and calculation of bolt connection of main and secondary girder,the force arm of additional moment usually takes the value which is the distance from the centroid of the bolt group in secondary girder to central line of the main girder web,the calculation method of additional moment caused by the eccentricity is not accurate with the actual stressing state.Monotonic static tests were conducted on the steel beam-and-girder bolt nodes,and yield load,ultimate bearing capacity and ultimate deformability of bolt connection of main and secondary girder were explored.Meanwhile,the finite element software ANSYS was employed to simulate the models of bolt connection of main and secondary girder,and comparison was made between the results of test,finite element calculation and routine analysis method.Finally,a method for the value of eccentricity of bearing capacity calculation of bolts in connection of main and secondary girder was proposed,the result was accord well with the test and finite element analysis ones.