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设计参数对空腹式连续刚构桥关键截面内力的影响

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Keywords: 桥梁工程,连续刚构桥,有限元法,结构分析,空腹式,挖空率,弦梁刚度比

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Abstract:

为掌握空腹式连续刚构桥在自重、汽车荷载作用下桥梁关键截面内力分布特征与腹板挖空率和弦梁刚度比的关系,以有限元法为基础,借助结构分析软件建立了空腹式连续刚构桥的数值模型,计算了自重、汽车荷载作用下跨中弯矩、上下弦梁接合处弯矩、弦梁墩顶截面弯矩以及下弦梁弯矩.论文还研究了这些截面弯矩比随着挖空率、弦梁刚度比的变化规律.研究表明腹板挖空率的增加,会缩小空腹段的负弯矩与实腹段的负弯矩的差距,但会放大实腹段內正负弯矩的差距.上下弦梁刚度比变化不影响实腹段弯矩分配,但上下弦梁负弯矩大小按它们刚度比进行分配,刚度比为0.25时,上下弦梁最大负弯矩相近.

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