小边跨梁拱组合体系桥梁结构性能分析与成桥荷载试验验证

Performance Analysis and Bridge Load Test Verification of Small Span Beam Arch Composite System Bridge

以某小边跨梁拱组合体系桥梁为研究对象,通过MIDAS建立全桥有限元模型,首先分析成桥状态下桥梁结构内力及应力,吊杆最大、最小应力及安全系数;其次通过对小边跨组合体系桥梁振型及稳定性分析,明确此类桥梁的结构阵型特点及稳定失稳模态;最后,通过荷载试验,验证设计及有限元模型的合理性。得出主要结论,通过计算表明,结构受力较为合理,结构动力性能较为合适,稳定性满足规范要求;实测振型与有限元结果具有很好的相关性,两者振型基本一致,且实测频率值均大于计算数值,表明桥梁结构各部分整体性能及技术情况良好。

In this paper,a small side-span beam arch combined system bridge is taken as the study object,and the finite element model for the whole bridge is established through MIDAS.Firstly,the internal force and stress,the maximum,minimum stress and safety factor of the bridge structure under the state of bridge are analyzed.Secondly,through the analysis of the vibration type and stability of the bridge with small side span combination system,this kind of bridge is clearly defined.Finally,through load test,the rationality of the design and finite element model is verified.The main conclusions are as follows:(1)through calculation,it shows that the structural stress is more reasonable,the structural dynamic performance is more suitable,the stability meets the requirements of the standard;and(2)the measured vibration mode has a good correlation with the finite element results,the vibration modes are basically the same,and the measured frequency values are larger than the calculated values,indicating the various parts of the bridge structure.The overall performance and technical conditions are good.