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以广东省潮州市韩江北桥主跨钢管混凝土斜靠式拱桥初步设计方案为对象,采用ANSYS有限元程序,并考虑边跨对主跨的弹性约束作用,建立了该中承式钢管混凝土斜靠式拱桥动力计算的整体空间有限元计算模型;探讨了14种不同工况条件对桥梁动力特性的影响。计算结果表明:该钢管混凝土斜靠式拱桥为柔性结构,桥梁的竖向刚度相对较强,而钢管混凝土拱肋的面外刚度相对较弱;V撑外端约束及系杆梁抗弯刚度的变化对该桥动力特性影响较小;稳定拱拱脚横向外移以及增加吊杆虽能增大该桥拱肋的横向面外刚度,但对全桥竖向及扭转刚度贡献不大;桥梁施工状态对该桥振型影响较大。
Taking the initial design scheme of the main span CFST inclined arch bridge of Hanjiang North Bridge in Chaozhou City, Guangdong Province as the object, the finite element program of ANSYS was used to consider the elastic restraint effect of the side span to the main span. The finite element calculation model for the dynamic calculation of the arch bridge; the influence of 14 different working conditions on the dynamic characteristics of the bridge is discussed. The calculated results show that the CFST arch-type arch bridge is a flexible structure, the vertical stiffness of the bridge is relatively strong, while the out-of-plane stiffness of the CFST arch rib is relatively weak. The dynamic characteristics of the bridge have little influence on the stability of the arch arch; lateral displacement of the stability arch arch foot and the increase of the suspension rod can increase the lateral outside stiffness of the arch rib, but make little contribution to the vertical and torsional stiffness of the bridge; The shape of the bridge is more influential.