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分幅斜拉桥斜拉索无应力长度的简化计算方法

DOI: 10.3969/j.issn.1674-0696.2014.06.02, PP. 5-8

Keywords: 桥梁工程,多塔、分幅、不对称索面斜拉桥,无应力索长,成品索长,等效刚度,悬链线方程,bridgeengineering,cablestayedbridgewithmlti-towerseparate,twin-decksandasymmetricalcableplane,unstressedlengthofcable,cablefinished

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Abstract:

:?多塔、分幅、内外侧索面不对称钢斜拉桥属典型空间结构,其斜拉索数量较多,直接确定每根斜拉索无应力长度非常困难。以六塔、双幅、空间四索面的嘉绍大桥为研究对象,首先基于刚度等效原则,将主桥空间结构等效简化为平面结构,确定其等效合理成桥索力;其次提出索力分配原则,将所确定的平面成桥索力转化为空间索力;最后利用悬链线方程求出每根斜拉索的无应力长度。经实践验证,该方法可快速、准确地确定各斜拉索的无应力长度。

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