预应力混凝土曲线刚构桥的空间效应研究  

Study on spatial effect of prestressed concrete curved rigid frame bridge

作　　者：张晔芝[1] 左维 杨毅 ZHANG Yezhi;ZUO Wei;YANG Yi(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院

出　　处：《铁道科学与工程学报》2019年第9期2248-2255,共8页Journal of Railway Science and Engineering

基　　金：湖南湘江新区投资集团有限公司投资项目(2017-9-25-220)

摘　　要：为研究曲线刚构桥变形和受力状态以及空间效应的相关规律,对一座主跨145 m,曲率半径600 m的5跨连续预应力曲线刚构桥模拟整个施工过程,采用空间梁格法进行有限元分析。研究结果表明:墩身处于轴压和切向、法向双向弯曲联合作用状态,梁体处于竖弯、横弯和扭转联合作用状态。由此造成梁体竖向位移和应力横向分布的不均匀性,且还有法向位移。悬臂浇筑各阶段,法向位移指向曲率中心侧,梁体竖向位移内侧大、外侧小,最大悬臂状态下,内侧竖向位移比中心线处增大49%,外侧比中心线处减小36%。应力也有较大的差别。二恒、活载作用下的空间效应规律正好与一恒作用下相反。本文研究成果可为今后曲线桥的设计和计算提供理论依据。In order to study the relationship between deformation,stress state and spatial effect of curved rigid frame bridge,the whole construction process and using three dimension grillage beam method,finite element analysis has been completed of a 5-span continuous prestressed curved rigid frame bridge with 145 m main span and 600 m radius of curvature.The deformation,force state and space effect were studied.The results show that the piers are under the combined action of axial pressure,tangential and normal bending,and the beam is under the combined action of vertical bending,transverse bending and torsion,which caused the difference of vertical displacement and stress on the transverse direction of the beam,and as well as caused the normal displacement of the beam.In each stage of cantilever constrction,the normal displacement points to the curvature center,and the inside vertical displacements of the beam are larger than that of the outside.Under the maximum cantilever state,the inside vertical displacements are 48%larger than that of the center,and the outside vertical displacements are 36%smaller than that of the center.The difference of stresses are also considerable.The research of this paper will provide theoretical basis for the design and calculation of curved bridge in the future.

关 键 词：预应力曲线刚构桥 空间梁格法 有限元 空间效应 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]