均布荷载作用下梁拱组合桥梁的实用计算

Practical Calculation of Beam-Arch Association Bridge Under Uniform Load

将外部静定、内部高次超静定的梁拱组合桥梁分解成梁拱闭合体和吊杆两种构件,并且将吊杆力假定为膜张力,通过力学方法求解得到下承式梁拱组合体系在均布荷载作用下挠度计算的实用公式及其修正系数,为设计人员理解梁拱组合体系的受力特性,在概念设计阶段确定较合理的结构参数提供了理论依据.

The beam-arch association bridge is composed of arch, main beam and hangers. It is difficult to handle its static analysis by mechanical method. The paper treats it as a two-component structure with beamarch closure and suspender, and the tension force is assumed as a filmy one. The practical formulas and its modified coefficients of deflection for beam-arch association bridge loaded by uniform load are obtained on the basis of mechanical method. It helps designers understand this kind of bridge＇s mechanical characteristic to draft reasonable structure parameters during the period of conceptual design.