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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 -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。
The long-span truss bridge is a brand new bridge structure system consisting of four main parts: prestressed cable trusses, main tower, anchorage and stiffening girder. The preliminary design, the structure of each part of the size and mutual relationship between the inexperienced can learn from, it is necessary to carry out optimization studies. Based on the current suspension bridge in China, Jiangyin Yangtze River Bridge, this paper applies the first-order sensitivity analysis method to study the static structure of this kind of bridge structure in order to obtain the excellent static performance and high economic index The most reasonable form of construction.