纵向预应力参数对连续刚构桥挠度和应力状态的影响分析
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摘要
纵向有效预应力是连续刚构桥中保证桥梁正常工作的重要保障,研究纵向预应力参数对桥梁结构的挠度和应力状态的影响,是提高桥梁最终的合龙精度及桥梁施工安全的关键。以巴河大桥(73m+130m+73m)为研究背景,利用有限元分析软件Dr.Bridge(V3.3)建立实桥有限元仿真分析模型,分别对桥梁最大悬臂状态和成桥状态下预应力参数的变化对结构的挠度和应力状态的影响展开分析。结果表明:各参数均会引起主梁位移和应力状态发生变化,预应力管道摩阻系数的影响较其他参数大,且对成桥状态的影响较最大悬臂状态大。因此,在进行同类桥梁施工控制时,应及时采集现场的实际预应力参数并反馈到计算模型中进行实时修正,以便指导桥梁顺利施工。
The longitudinal prestress is an important guarantee for ensuring the normal work of bridges in continuous rigid frame bridges. Studying the influence of longitudinal pre-stress parameters on the deflection and stress state of the bridge structure is the key to improving the final closure precision of the bridge and the bridge construction safety. Taking the Bahe Bridge( 73 m + 130 m + 73 m) as the research background,the finite element analysis software Dr Bridge( V3. 3) is used to establish the finite element simulation analysis model of the real bridge. The influence of the change of the pre-stress parameters on the deflection and stress state of the structure under the maximum cantilever state and bridge state of the bridge is analyzed. The results show that each parameter will cause the main beam displacement and stress state to change. The influence of friction coefficient of prestressed pipe is greater than other parameters,and the effect on the completed state is greater than the maximum cantilever state. Therefore,when carrying out similar bridge construction control,The actual prestressing parameters of the site should be collected in time and fed back to the calculation model for real-time correction in order to guide the smooth construction of the bridge.
The longitudinal prestress is an important guarantee for ensuring the normal work of bridges in continuous rigid frame bridges. Studying the influence of longitudinal pre-stress parameters on the deflection and stress state of the bridge structure is the key to improving the final closure precision of the bridge and the bridge construction safety. Taking the Bahe Bridge( 73 m + 130 m + 73 m) as the research background,the finite element analysis software Dr Bridge( V3. 3) is used to establish the finite element simulation analysis model of the real bridge. The influence of the change of the pre-stress parameters on the deflection and stress state of the structure under the maximum cantilever state and bridge state of the bridge is analyzed. The results show that each parameter will cause the main beam displacement and stress state to change. The influence of friction coefficient of prestressed pipe is greater than other parameters,and the effect on the completed state is greater than the maximum cantilever state. Therefore,when carrying out similar bridge construction control,The actual prestressing parameters of the site should be collected in time and fed back to the calculation model for real-time correction in order to guide the smooth construction of the bridge.
引文
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[5]何晓春.预应力摩阻损失对连续刚构桥挠度的影响[J].桥隧工程,2016(4):268-269.
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[2]张宏祥,包旭.预应力损失对连续刚构桥刚度和应力状态的影响分析[J].世界桥梁,2014(1):36-39.
[3]邓志恒,罗志佳,林俊.预应力损失对箱梁腹板斜裂缝影响分析[J].中外公路,2008,28(3):71-74.
[4]张桃,肖盛燮,陶韬.预应力混凝土连续刚构桥预拱度的设置与控制[J].交通科技与经济,2012(4):7-14.
[5]何晓春.预应力摩阻损失对连续刚构桥挠度的影响[J].桥隧工程,2016(4):268-269.
[6]马松松,于丛丛,耿波.PC连续刚构桥施工控制参数敏感性分析[J].公路交通技术,2013(4):93-100.
[7]向东刚.高墩大跨度连续刚构桥施工控制及影响参数分析[D].西安:长安大学,2014.