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曲线箱梁桥悬臂施工应力与线形现场测试研究

Keywords: 桥梁工程,曲线箱梁,现场监测,弯扭耦合,温度效应

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Abstract:

通过现场监测和数值模拟手段,分析了预应力混凝土曲线箱梁桥悬臂施工过程中的应力和线形变化规律,讨论了曲线箱梁弯扭耦合效应及日照温度梯度对曲线箱梁桥内力和线形的影响。研究结果表明,曲线箱梁两侧翼缘板应力差值、竖向位移差值及箱梁径向位移随着箱梁曲率、墩身高度和悬臂长度的增大而增大;日照温度应力随温度梯度、约束条件和悬臂长度的变化而变化,其量级可能超过结构的活荷载水平,温度对箱梁标高的影响也不容忽视,且温度应力和温度位移具有滞后效应。研究结论可为预应力混凝土曲线箱梁桥的设计和施工提供有益的参考。

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