匝道设缝墩曲线刚构桥模型试验研究  

Model Test Study on Curved Rigid Frame Bridge with Pier of Set Seam on Ring Road

作　　者：冯珍 王解军[1] 杨孝博 赵怡彬 FENG Zhen;WANG Jiejun;YANG Xiaobo;Zhao Yibin(College of Civil Engineering,Central South University of Forestry and Technology,Changsha,Hunan 410004,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004

出　　处：《公路工程》2019年第1期86-91,105,共7页Highway Engineering

基　　金：湖南省交通科技计划项目(201526);中南林业科技大学校青年基金(2018YC005)

摘　　要：提出的匝道设缝双肢墩小半径曲线刚构桥新结构体系,具有结构整体性好且利于抗震、城市桥梁美观等优点,还可望能彻底解决曲线桥的倾覆问题。采用有机玻璃根据相似原理设计制作3跨1/30的试验模型,通过静力加载试验测得模型的应变和挠度。运用有限元软件ABAQUS建立不同半径的实体单元模型,对比分析匝道设缝双肢墩小半径曲线刚构桥的受力不均匀性。结果表明:荷载作用在边跨跨中时,边跨箱梁底板内外侧应力、挠度、支座反力及墩身应力的不均匀性较大,且支座反力与墩身应力不均匀性大于箱梁应力、挠度的不均匀性;荷载作用于中跨时结构受力较均匀;随着半径减小,箱梁挠度、支座反力及墩身应力不均匀性皆增大。This paper proposes a new structural system with small radius curved ramp rigid frame bridge with new double-limb pier of set seam.It has the advantages of good structural integrity,good earthquake resistance and beauty to urban bridges.It is also expected to completely solve the overturning problem of curved bridges.A plexiglass model of 3-span 1/30 was made according to the similar principle,and the strain and deflection of the model were measured by static loading test.The finite element software ABAQUS was used to establish the solid element models with different radii,and the force uneven of the small radius curved ramp rigid frame bridge was compared and analyzed.The results show When the load acts on the side span,the inner and outer stress,deflection,bearing reaction force and pier body stress non-uniformity of the side span box girder are larger,and the non-uniformity of bearing reaction force and the pier body stress are greater than the non-uniformity of the deflection and stress of the box;the stress is more uniform when the load acts on the middle span;as the radius decreases,the box beam deflection,the bearing reaction force and the pier body stress non-uniformity increase.

关 键 词：设缝双肢墩 小半径曲线刚构桥 模型试验 静力试验 受力不均匀性 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]