预应力损失对大跨宽幅PC连续刚构桥挠度影响研究  

RESEARCH ON THE IMPACT OF PRESTRESS LOSS ON DEFLECTION OF LARGE-SPAN WIDE PC CONTINUOUS RIGID FRAME BRIDGE

作　　者：陈传勇 王思文 周静[2] 曾勇[2] 陈辉强[2] CHEN Chuan-yong;WANG Si-wen;ZHOU Jing;ZENG Yong;CHEN Hui-qiang(The Eighth Engineering Co.,Ltd.,of The First Highway Engineering Bureau of CCCC,300170,Tianjin,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,400074,Chongqing,China)

机构地区：[1]中交一公局第八工程有限公司,天津300170 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074

出　　处：《建筑技术》2023年第22期2708-2713,共6页Architecture Technology

基　　金：重庆市留学人员回国创业创新支持基金项目(cx2018113,cx2020117);山区桥梁及隧道工程国家重点实验室开放基金项目(CQSLBF-Y14-3,CQSLBF-Y16-10)。

摘　　要：近年来随着预应力混凝土技术以及悬臂施工技术的迅速发展,大跨宽幅PC连续刚构桥得到了较快的发展。但是研究分析发现,在时间的流逝中会出现预应力损失的现象,同时发现桥梁的挠度与预应力损失之间的联系密不可分。以重庆首座高速公路、市政道路合建连续刚构桥--龙溪嘉陵江特大桥为研究对象,运用有限元软件建立有限元模型,对钢筋管道摩阻以及混凝土截面的各类预应力钢束损失造成的桥梁下挠问题进行研究,发现钢筋管道的摩擦阻力与桥梁下挠问题之间的联系较小,但钢束预应力损失对桥梁下挠造成的影响较大,在桥梁下挠的问题中应重视此类问题。研究结果对大跨连续刚构桥的挠度控制方面有着积极的意义。In recent years,with the rapid development of prestressed concrete technology and cantilever construction technology,large-span wide PC continuous rigid frame bridges have been developed fast.However,research and analysis show that prestress loss occurs over time,and the deflection of bridges is closely associated with prestress loss.Taking Longxi Jialingjiang Super-large Bridge as the research object,which is the continuous rigid frame bridge over highways and municipal roads in Chongqing,a finite element model is built with finite element software.Through research on the impact of the frictional resistance of reinforced pipes and the prestress loss of prestressed steel cables of concrete sections on the deflection of the bridge,it is found that the frictional resistance of reinforced pipes is associated little with the deflection of the bridge,while the prestress loss of prestressed steel cables has significant impact on the deflection of the bridge.Importance should be attached to this aspect in terms of bridge deflection.Research results are of positive significance to control the deflection of large-span continuous rigid frame bridges.

关 键 词：桥梁工程 预应力损失 连续刚构桥 长期挠度 有限元分析 

分 类 号：TU448[建筑科学—岩土工程]