非对称桥面布置的公铁两用钢桁梁桥空间受力性能研究

Spacial Mechanical Behaviour Research of the Motor-cum-rail Steel Truss Bridge with Nonsymmetrical Bridge Deck System Layout

缅甸央东伊洛瓦底江公铁两用大桥主桥为连续钢桁梁,主桁内侧布置双车道公路和单线铁路,桥面为非对称布置。由于桥面二期恒载分布和活载的较大差异,造成两片主桁受力不均,通过空间受力性能的研究,解决了非对称桥面的钢桁梁设计问题。

The main bridge of the Ayeyawady Bridge （NYAUNG DON） Motor-cum-rail Project in Myanmar consists of continuous truss bridges, whose carriageways consist of 1 lane Meter Gauge rail and 2 lanes for motorized traffic inside the truss, which is nonsymmetrical. The two trusses are under uni- form stress because the layout of the dead load and live load is different. In this paper, the design problems of the steel trusses with nonsymmetrical deck system layout are solved from studying the spacial mechanical behaviour.