论文部分内容阅读
据现有文献,钢鼻托梁为首次在沉管隧道工程中应用,现阶段其结构设计为经验性预估得来,且上、下两个鼻托梁对接过程中受到导向装置传递的竖向作用力,因此有必要对钢鼻托梁在竖向荷载作用下的承载力进行三维精细化数值模拟分析,以掌握其极限承载力和刚度情况。本文经过数值模拟分析,得到了模型在竖向荷载作用下的荷载-位移曲线、极限承载力、最大应力和位移发生的位置,得出鼻托梁为受剪为主的构件,其刚度较钢剪力键大,存在剪力键先于鼻托梁翘曲和破坏的风险等结论,本文研究为钢鼻托梁在工程应用中推广和改进提供有益参考。
According to the existing literature, the steel nose joist is applied for the first time in immersed tunnel engineering. At this stage, its structural design is empirically estimated, and the upper and lower nose bridge beams are guided by the guide during the docking process Therefore, it is necessary to carry out three-dimensional numerical simulation on the bearing capacity of steel nose joist under vertical load to grasp the ultimate bearing capacity and stiffness. After numerical simulation analysis, the load-displacement curve, ultimate bearing capacity, maximum stress and position of displacement of the model under vertical load are obtained. The force key is large, there is a risk that the shear key will be warped and damaged before the nose joist, and so on. This study provides a useful reference for the popularization and improvement of steel nose joist in engineering application.