海河口栈桥预应力网架结构方案设计

Preliminary Design of Pre-stressed Steel NetworkStructure Trestle across the Haihekou River Mouth

简单介绍了本设计的工程背景。阐述了跨海河大跨度预应力网架的可行性,具体分析了栈桥荷载的各种工况,包括不对称荷载的扭矩影响、预应力施加及多次施加预应力出现反拱的可能性及平面水平弧度的向心力的影响等。通过对同样荷载情况下施加预应力和未施加预应力钢网架的分析和比较,以及同钢桁架等多种结构型式的分析比较,指出大跨度预应力网架的优越性是显著的,并提出了初步设计的结构方案,给出了供具体详图设计的各个参数。

In this paper the background of the project is briefly introduced. The feasibility of the large span Pre-stressed Steel Network Structure (PSNS) trestle across the Haihekou river mouth is expounded. Diversified load cases including the twist influenced by the unsymmetrical loads and the probability of the reversed arch induced by the pre-stressing or multiple pre-stressing as well as the influence of the centrifugal force due to the curve on the plane are discussed. By analyzing and comparing the PSNS under the same loads and in cases of with or without pre-stressing force as well as comparing them with other structural types such as steel truss, the advantage of the large span PSNS is pointed out. The preliminary design of the structural scheme of PRNS trestle is presented and various parameters for detailed design are given.