微型桩支撑引板的无缝桥试设计研究

发布时间：2018-07-10 15:41

本文选题：微型桩 + 无缝桥　；参考：《建筑科学与工程学报》2017年04期

【摘要】：为研究微型桩支撑引板的无缝桥受力性能,进行了这种新型无缝桥的试设计,采用MIDAS/Civil建立了考虑微型桩-土相互作用的全桥空间有限元模型,对比分析了试设计桥与原桥在恒载作用、汽车荷载作用、引板沉降下的受力行为,以及温度作用、收缩徐变效应、引板与接线路面间伸缩量下的受力行为;采用模态分析和地震时程分析方法研究了桥梁自振特性和地震响应。结果表明:竖向荷载作用下试设计桥的主梁边跨正弯矩减少,同时引板沉降减少;微型桩的约束作用会使主梁在升温、降温、收缩徐变作用下的轴力增大;试设计桥在地震荷载作用下位移反应减少,提高了桥梁的抗震性能;该研究成果可为微型桩支撑引板的无缝桥设计提供借鉴,对该新型无缝桥在实际工程中的应用和发展起到推动作用。
[Abstract]:In order to study the mechanical performance of the jointless bridge supported by micro-pile, the experimental design of this new type of seamless bridge is carried out. The spatial finite element model of the whole bridge considering micro-pile-soil interaction is established by Midas / Civil. The stress behavior of the bridge under dead load, automobile load, settlement of lead plate, temperature effect, shrinkage and creep effect, and the stress behavior between the lead plate and the connecting road surface are compared and analyzed. The natural vibration characteristics and seismic response of bridges are studied by means of modal analysis and seismic time history analysis. The results show that the positive moment of the side span of the main beam is decreased and the settlement of the plate is decreased under the vertical load, and the axial force of the main beam under the action of the micro-pile will increase under the action of temperature rise, cooling down and shrinkage and creep. The seismic behavior of the bridge can be improved by reducing the displacement response of the bridge under the earthquake load, and the research results can be used for reference for the design of the seamless bridge supported by micro-pile. It can promote the application and development of the new seamless bridge in practical engineering.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金项目(51278126) 福建省自然科学基金项目(2013J01187)
【分类号】：U442.5

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