简支下承式钢管混凝土系杆拱桥稳定性参数研究

Study on Stability Parameters of Simple-supported Lower-bearing Steel Pipe Concrete Tied Arch Bridge

针对简支下承式系杆拱桥拱肋较高而导致的结构稳定性问题,以简支下承式钢管混凝土系杆拱桥为例,结合midas Civil有限元软件建立三维空间模型,研究拱肋之间的横撑连接形式、拱肋矢跨比、拱肋刚度、拱肋倾角以及吊杆布置形式等参数对结构空间稳定性方面的影响规律。结果表明,拱肋横撑连接形式、拱肋矢跨比、拱肋刚度以及拱肋倾角均对结构的空间稳定性影响很大,而吊杆布置形式对结构空间稳定性影响很小,变化幅度仅为8.8%,因此在拱桥设计过程中需要对这些参数的取值进行对比分析,避免导致结构失稳出现安全事故。

Aiming at the structural stability problem caused by the high arch rib of simply supported underbuttoned tied arch bridge,taking simply supported underbuttoned concrete filled steel tube tied arch bridge as an example,and combining midas Civil finite element software,a three-dimensional space model was established.The influences of the parameters such as transverse brace connection form,rib-vector span ratio,rib-stiffness,rib-angle and suspender layout on the spatial stability of the structure are studied.The results show that the arch rib cross-brace connection form,arch rib sagittal span ratio,arch rib stiffness and arch rib dip angle all have great influence on the spatial stability of the structure,while the layout form of the derrick has little influence on the spatial stability of the structure,the variation range is only 8.8%.Therefore,the value of these parameters should be compared and analyzed in the design process of the arch bridge,so as to avoid the safety accidents resulting in structural instability.