高强钢军用桥梁桥脚结构的整体稳定性研究

摘要

高强钢军用桥梁桥脚结构的稳定问题是目前军用桥梁多跨桥研究的重点之一,但对桥脚结构的稳定性分析和设计仍然存在诸多的难点和缺陷.研究结合钢结构刚架或半刚架稳定性分析理论,利用大型通用有限元程序ANSYS,对门式桥脚和凳式桥脚的整体稳定性进行数值模拟,得到其整体稳定极限荷载,并与军用桥梁桥脚结构整体失稳的模型试验进行了对比,表明了ANSYS模拟军用桥梁桥脚结构整体稳定性计算的准确性和可靠性.研究对今后军用桥梁装备的研制开发、现行《军用桥梁设计准则》的修改制定和军用桥梁结构相关设计方法的改进完善将具有重要的意义.%One of the research emphases of multi-span military bridge is its trestle structure's stability. Some problems and defects still exist in the present system of stability analysis and design for military bridge trestle structure. By means of large finite element analysis software ANSYS, combined with stability theory of steel rigid or semi-rigid frames, the overall stability of two types of military bridge trestle (portal and stool-like bridge trestle) are studied, and their overall stable ultimate load-carrying capacities are obtained. Comparing with stability test results, it can be seen that the veracity and reliability of the ANSYS simulation is proved. The research is of great significance to the development of military bridge e-quipments, modification of existing design criterions and improvement of correlative design methods.