连续桥梁吊杆内力调整技术

Research on Internal Force Adjustment Technology of Continuous Bridge Suspender

对于连续桥面悬索桥或拱桥,任一吊杆内力变化都将引起整个结构的内力重分布,只有通过对结构进行有限元计算,并充分考虑张拉某根吊杆时对其他吊杆内力的影响,才能快捷有效地使各根吊杆内力达到设计内力要求。以某一钢箱梁拱桥结构为依托,利用结构有限元midas Civil软件建模计算,采用影响矩阵法计算施工张拉力以调整吊杆内力,工程实践表明,通过这种方法调整的吊杆内力和设计内力能很好地吻合,且调整周期短,可大大节省人力、物力。

For continuous deck suspension bridge or arch bridge,the change of internal force of any one suspender will cause the redistribution of internal force of the whole structure. Therefore,the suspender can not simply be stretched by the design internal force.it＇s the only way to calculate the structure by finite element analysis and take full account of the influence of the internal forces of the other suspender when one suspender is stretched,that can make the internal forces of all suspenders efficiently meet the design requirement.Based on a steel box girderarch bridge,the structural finite element software Midas is used to model and calculatethe internal forces of suspenders. The influence matrix methodis used to calculate the stretch force. The experimental result suggests that the internal force of the suspenders adjusted by this way shows a close agreement with the design internal force,and the adjusting cycle is short,which can greatly save manpower and material resources.