Study on Mapping Mechanism of Bolt Slippage and Spatial Distortion of Steel Truss Bridge
The fine measurement and modeling of 3D laser scanning are carried out for a 80-m simple-supported bolt-welded through steel truss girder bridge with spatial distortion are carried out,and the numerical simulation is conducted to analyze the influence of pre-tightening force change of the node bolt on the bending stiffness of the rod end and the mapping relationship between the slippage of node bolt and the bending stiffness of rod end.A simplified method to simulate the bolt slippage by reducing the bending stiffness of equivalent rod end is presented.When the pre-tightening force of the bolt is reduced,the bending stiffness of the rod end decreases.With the increase of the reduction degree of bolt pre-tightening force,the bending stiffness of rod end decreases rapidly.By analyzing the transverse deformation rule of the steel truss girder bridge,under the condition of reducing the pre-tightening force of the bolts at EE0-EE4,EE5-EE10 and A7-A9,the overall transverse deformation trend of the steel truss girder bridge is the same as the actual measured transverse deformation trend of the bridge,and the deformation of the both is similar.
万方数据
维普
