吊杆破断情况下湛河斜靠式拱桥静力性能分析

Static Properties Analysis of the Zhanhe Double X-arch Bridge in Suspender Fracture State

以平顶山市城东河路湛河桥主桥—斜靠式拱桥为实例,采用MIDAS/Civil有限元软件建立该桥的空间有限元计算模型,进行不同吊杆破断情况下的斜靠式拱桥静力性能分析,通过对比桥梁在完好状态和不同吊杆破断情况下的静力性能,得出结论:桥梁各构件的强度满足规范要求;主拱、稳定拱吊杆安全系数分别为2.7和3.03,满足规范规定;桥梁变形满足正常使用极限状态下的变形要求.该桥由于设有较强大的系梁,在某些吊杆出现破断情况下,还能满足桥梁规范要求,表明该桥梁安全储备较大.计算结果对正确认识斜靠式拱桥在不同吊杆破断状态下的静力性能,为桥梁的科学维护提供依据,也为湛河斜靠式拱桥更换吊杆提供理论指导.

Based on the example of the main bridge of Zhanhe bridge-a double X-arch bridge across the Chengdong River in Pingdingshan City,the bridge＇s spatial finite element model was built by the FEM software MIDAS/Civil.The bridge＇s static properties under different suspender fracture had been calculated.By comparing the bridge＇s static properties in health state and in suspender fracture state,it was concluded： The intensity of each component of the bridge met the standard requirement.The safety factor of the main arch was 2.7 and the stable arch was 3.0,so the bridge stability met the standard requirement.The bridge deformation met the request of allowable deformation in normal service limit state condition.Because of the powerful tie beam,in certain circumstances of several suspenders fracture,the bridge＇s static properties met the standard requirement.The results showed the bridge had a large emergency capacity.These conclusions provided the basis for understanding correctly the structural static properties of double X-arch bridge in different suspender fracture states,and also provided theoretical direction for scientific maintenance or suspender replacement for the bridge.