自錨式懸索橋影響線分析

懸索橋無論是採用地錨式或自錨式，體系都屬於由主纜、吊索、橋塔與主梁構成的柔性組合結構，具有跨越能力佳，受力分佈合理，最能發揮材料特性的優點。在橋梁結構分析時，一般需藉由影響線來確定活載重的臨界位置，進而得出斷面最大應力值，以作為斷面設計之依據，因此如何針對非線性與高靜不定度的懸索橋進行影響線分析，便成為一項值得探討的研究課題。本文即針對此項課題進行模式建立與分析比較。文內，除探討建立懸索橋之影響線分析模式外，並探討比較主纜、橋塔、主梁、吊索等結構之彈性模數、斷面積以及主梁慣性矩之變化對懸索橋影響線分析結果之影響。研究結果顯示，主梁彈性模數的變化對懸索橋影響線分析結果之影響最大，其次為主梁慣性矩、主纜彈性模數、主纜斷面積，而吊索斷面積為影響最小。

關鍵字

懸索橋；自錨式；影響線

並列摘要

A suspension bridge, either earth-anchored or self-anchored, its system being an elastic structural combination of main cables, hangers, towers and girders, features long-span capability and rational distribution of force exertion, and allows best elaboration of characteristic merits of the materials. During the structural analysis of a bridge, it is generally required to verify the critical positions of live loads by way of influence line analysis, for attaining the maximum stress value of a section - as the basis for the section design. It is therefore worthwhile to explore the subject of nonlinearity and high statical indeterminacy of a suspension bridge. In this paper, besides conducted the investigation on the establishment of an analytic model for determining the influence lines of suspension bridge, also discussed comparisons of variations in the elastical modulus, cross section area, and moment of inertial in main girders of the structural members (i.e. main cables, tower, girders, and cables) versus the effects on the results of influence line analysis of suspension bridges. The research result showed that variations of the elastical modulus of main girder have the primary (or largest) effects on the results of a suspension bridge influence line analysis while variations of the moment of inertia of main girder have the secondary effects; followed sequentially by variations of the elastical modulus of main cable and the cross section area of main cable, while variations of the cable cross section area have the least effects.

並列關鍵字

suspension bridge ； self-anchored ； influence line

國際替代計量

自錨式懸索橋影響線分析

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