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中文摘要：
以国内第一大跨桥梁——润扬长江公路大桥南汉悬索桥为背景，在对大桥整体结构进行非线性有限元分析的基础上，运用子模型法计算了该桥扁平钢箱梁各关键部位的应力。与实测数据的对比表明：子模型法计算结果准确可靠，能够较真实的反映大桥钢箱梁在各种工况下的受力状态，是分析超大跨悬索桥钢箱梁应力水平及其分布的有效方法。最后分析了该桥钢箱梁的受力特点，为同类流线形扁平钢箱梁的应力分析和设计提供参考依据。
英文摘要：
A 3-dimensional, Finite Element, full model for the Runyang Suspension Bridge, the longest bridge in China was established and analyzed. The submodel of the steel box girder was then particularly established based on the analyzed results considering the connection of the two models. The local stresses of the steel box girder under various load conditions were calculated with the submodel. The calculation stress values were found to be reliable by comparing with the field measurements and the submodel method was proved to be effective on analyzing the stress levels and distributions of steel box girders of super-long-span suspension bridges. Finally the working behaviors and mechanical characteristics of the steel box girder of the Runyang Suspension Bridge were analyzed. The analysis results could provide theoretical references for analyzing the steel box girders of super-long-span suspension bridges.
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