【摘要】 以平顶山市城东河路湛河桥主桥为工程背景,采用有限元软件MIDAS/Civil建立该桥的空间有限元计算模型,分6种设计方案研究了拱肋倾角变化对斜靠式拱桥动力性能的影响。计算结果表明,主拱肋倾角和稳定拱肋倾角的变化都对斜靠式拱桥自振频率影响较大,桥梁低阶自振频率随着拱肋倾角的增大而增大,但主拱肋倾角一旦超过1°后,桥梁第6阶以后的高阶自振频率相反会减小。计算结果可为斜靠式拱桥的设计提供参考。更多还原

【Abstract】 Backgrounded by the main bridge of Zhanhe River Bridge at Chengdonghe Road,Pingdingshan City,the software MIDAS/Civil is used to establish a 3-dimensional finite element calculation model for the double X-shape arch bridge and the effect of arch rib sloping angle changes on the dynamic performance of the type of the bridge is studied respectively for six design alternatives.The results of calculation indicate that the sloping angle changes of the main arch and stabilizing arch ribs all have significant effect on the natural vibration frequency of the bridge and the lower order vibration frequency of the bridge will increase with the augmentation of the arch rib sloping angle.However,once the sloping angle change of the main arch rib becomes greater than 1°,the high order vibration frequency after the 6th order will decrease on the contrary.The calculation in the paper may provide reference for the design of such type of the arch bridge.更多还原