驷马山河大桥260m网状系杆拱桥总体设计分析

Overall Design of a 260m Mesh Tied Arch Bridge for Simashan River Bridge

为了明确网状系杆拱桥的力学与经济性能,以驷马山河大桥为例进行分析。该桥结构形式采用260m网状系杆拱,桥梁整体宽度31.08m。主拱为提篮式钢箱拱,内倾角9°,拱肋斜平面矢高为51.28m,矢跨比f/L=1/5。系梁采用平行四边形钢箱梁,为刚性系梁,桥面系采用正交异性钢桥面板,横梁、小纵梁及加劲肋保证整体及局部传力。桥梁采用网状吊杆,系梁纵桥向吊点间距为6m。通过静力计算、稳定分析,验证了该设计方案的合理性以及安全性,可为同类桥型设计提供参考。

In order to clarify the mechanical and economic performance of the mesh tied arch bridge,this article analyzes it based on the Simashan River Bridge.The bridge structure adopts a 260m mesh tied arch,with an overall width of 31.08m.The main arch is a basket shaped steel box arch with an inward inclination angle of 9°.The inclined plane height of the arch ribs is 51.28 meters,and the rise span ratio is f/L=1/5.The tie beam adopts a parallelogram steel box girder,which is a rigid tie beam.The bridge deck system adopts orthotropic steel deck panels,and the crossbeams,small longitudinal beams,and stiffeners ensure overall and local force transmission.The bridge adopts a mesh suspension rod,and the spacing between the longitudinal suspension points of the tie beam is 6m.The rationality and safety of the design scheme have been verified through static calculation and stability analysis,which can provide reference for the design of similar bridge types.