Force Analysis of High-Strength Bolt Group Connecting Pylon and Hoisting Device of Hong Kong-Zhuhai-Macao Bridge

To have an understanding of the force conditions of the high-strength bolt group connecting the sail-shape pylon and hoisting device in the process of hoisting and installing the pylon of the River-to-Sea Ship Channel Bridge of the Hong Kong-Zhuhai-Macao Bridge,the appropriate scheme for hoisting and installing the pylon and for connecting the pylon and hoisting device was proposed.The hoisting and installing of segment Z10 of the pylon of the bridge was cited as a case analysis.The ANSYS was used to set up the finite element model for both the segment Z10 and the hoisting device,3typical hoisting and installing modes of 0°,45°and 90°were selected and the force conditions of the high-strength bolt group were analyzed.The results of the analysis show that in the hoisting and installing of the pylon from the horizontal to the vertical directions,the pylon and hoisting boom connected by the high-strength bolt group can not cater for the requirements of the hoisting and installing.In such case,the measure of replacing part of the highstrength bolts that are to bear excessive load with the high-strength steel rod assembly is taken in order to enhance the reliability of the connecting of the pylon and hoisting device.With the measure having been taken,the maximum tensile stress of the steel rods is 947 MPa and the radial shear stress is 586 MPa.The maximum tensile stress of the high-strength bolt group is 829 MPa and the radial shear stress is 395 MPa.The stresses all can satisfy the requirements and the proposed scheme is finally successfully put in use in the construction.