大跨索桁桥静力优化研究

大跨索桁桥是一种全新的桥梁结构体系,由预应力索桁架、主塔、锚碇和加劲梁4个主要部分构成。初步设计时,其各个部分的结构尺寸以及相互之间的关系没有经验可以借鉴,故进行优化研究是非常必要的。本文以我国目前跨径最大的悬索桥一江阴长江大桥为背景,应用一阶敏度分析方法,对该种桥梁结构形式进行静力优化研究,以期得出静力性能优良而又具有较高经济指标的最合理的构造形式。

Static Optimum Study of Long Span Cable-Truss Bridges

The long span cable truss bridge is a brand new kind of long span bridges which composed of prestressed cable trusses, main towers, anchorages and stiffing girders. Since no experience can be used for reference to determine dimensions of its main parts, so static optimum study in the preliminary design stage is very necessary. The long span bridge which has the same usage characteristics as Jiangyin Bridge is imagined and first order optimum method is used to do this study.