预制节段拼装箱梁长期变形性能研究  

Long-term deformation behavior of precast segmental box girder

作　　者：潘鑫鹏 曹健 龚亦凡 赵尚传[3] PAN Xinpeng;CAO Jian;GONG Yifan;ZHAO Shangchuan(School of Civil and Architectural Engineering;Yaohu College,Nanchang Institute of Technology,Nanchang 330099,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)

机构地区：[1]南昌工程学院土木与建筑工程学院,江西南昌330099 [2]南昌工程学院瑶湖学院,江西南昌330099 [3]交通运输部公路科学研究院,北京100088

出　　处：《南昌工程学院学报》2020年第4期37-42,共6页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJJ170985);国家大学生创新创业训练计划资助项目(201911319018)。

摘　　要：采用混凝土徐变理论,在整体浇筑桥梁长期变形计算模型的基础上,结合混凝土龄期效应的分时步计算法,推导出预制节段拼装箱梁的长期变形计算模型。此模型考虑了预应力损失引起的滞后弹性变形,在时间划分的足够细的情况下计算准精度较高。最后,以南沙大桥引桥62.5m跨为工程背景,利用有限元软件Midas Civil,分析了混凝土收缩徐变对南沙大桥引桥长期变形性能的影响。结果表明,所建模型可为预制阶段拼装箱梁长期性能的数值分析提供了一定的理论依据。Based on the concrete creep theory and the long-term deformation formula of integrally poured bridges,this paper deduces the long-term deformation formula of precast segmental assembled box girders by combining the time-sharing step calculation method considering the age effect of concrete.This formula takes into account the hysteretic elastic deformation caused by the loss of prestressing force,and has high accuracy when the time division is sufficiently fine.Finally,taking the 62.5m span of approach bridge of Nansha Bridge as the engineering background and using the finite element software Midas Civil,the influence of concrete shrinkage and creep on the long-term deformation performance of approach bridge of Nansha Bridge is analyzed.The results show that the formulas presented in this paper can provide a numerical analysis for the long-term performance of assembled box girders in prefabrication stage,and certain theoretical basis is provided.

关 键 词：预制节段拼装箱梁 混凝土徐变 分时步计算法 南沙大桥 有限元数值模拟 

分 类 号：TU997[建筑科学—市政工程]