变截面预应力混凝土连续箱梁桥0~#块空间应力分析  

Analysis for Stress of No.0 Block Space of Variable Cross-section Prestressed Concrete Continuous Box-girder Bridges

作　　者：宁舟[1] 李传习[1] 欧见仁[1] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410004

出　　处：《公路交通技术》2013年第1期42-46,共5页Technology of Highway and Transport

基　　金：国家自然科学基金(50778024);博士点基金(2011431610002);长湘高速公路"两型"科技示范工程项目(CXKJSF0108-3)

摘　　要：针对预应力对薄壁箱梁结构0#块剪滞效应影响研究不足的现状,以某变截面预应力混凝土连续箱梁桥为背景工程,基于Midas Civil建立全桥整体模型,并用ANSYS建立该桥0#块实体模型。分析0#块在不同工况下的空间应力状况,揭示0#块的受力特性和应力分布规律,同时分析最大双悬臂状态下预应力对箱梁0#块剪力滞效应的影响,得出预应力对剪力滞效应有抑制作用等结论。Aiming at the status of insufficient research on influences of stress on shear lag effect of No.0 blocks of thin-wall box-girder structures,this paper establishes integral modle of the whole bridge based on Midas Civil with some variable cross-section prestressed concrete continuous box-girder bridge as a background project and establishes physical model of No.0 blocks via ANSYS.The paper analyzes space stress conditions of No.0 blocks under different working conditions and discloses loaded characteristics and distribution law of stress of No.0 blocks,and meantime analyzes influences of prestress on shear lag effect of No.0 blocks of box girders in the state of the max.double cantilevers to obtain conclusions that prestress has inhibitory action for shear lag effect,etc.

关 键 词：连续箱梁桥 ANSYS 0#块 应力分布规律 剪力滞 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]