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中文摘要：
大跨度桥梁结构分析必须计入几何非线性的影响。在总结线性、非线性活载效应分析理论的基础上,对ANSYS程序采用APDL语言进行了二次开发,基于影响线概念实现了线性、线性二阶、全非线性三种方法的活载效应分析功能。对一座主跨1 400 m斜拉桥方案的试算工作表明,开发的计算功能切实可靠,且计算速度快。同时,三种方法计算结果对比表明,对大跨度桥梁结构,线性方法误差较大而且计算结果偏于不安全,仅能用以初步估算;而线性二阶方法的计算精度很高,当计算工作量过大或时间受限制时是全非线性方法是较为可靠的替代方法。
英文摘要：
Geometry nonlinear effect should be taken into account in the analysis of long span bridges.Based on the summary of linear and nonlinear analysis theories of live load effect,secondary development of ANSYS using APDL was accomplished.Three methods including linear,second-order linear,full nonlinear analysis were realized based on the concept of influence line.Trial computation of a 1 400 m cable-stayed bridge indicates that the procedure is reliable and the computing speed is fast.Comparison between results of the three methods shows that the linear method can only be used in estimation because that the error is larger and the result is unsafe for long span bridges,while the second-order linear method is much more precise and can be used as substitute of the full nonlinear method when the workload is too hard or time is limited.
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