大幅变宽连续箱梁桥受弯性能研究  

Mechanical characteristics of continuous box-girder bridge with sharply variable width

作　　者：戴理朝 王冲 陈鹏 赵威 DAI Lizhao;WANG Chong;CHEN Peng;ZHAO Wei(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;Guangxi Communications Technology Group Co.,Ltd.,Nanning 530000,China;China Energy Engineering Group Zhongnan Surveying and Design Institute Co.,Ltd.,Changsha 410014,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]广西交科集团有限公司,广西南宁530000 [3]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《交通科学与工程》2024年第1期60-67,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(52008035);湖南省创新研究群体项目(2020JJ1006);湖南省交通科技项目(201619)。

摘　　要：为研究大幅变宽度连续箱梁桥的宽跨比对其力学特性的影响,以湖南省长益高速公路互通匝道变宽预应力混凝土连续梁桥为工程背景,分别建立梁格模型与单梁模型,对其弯矩、挠度及应力进行分析。研究结果表明:在仅考虑自重与二期荷载作用下,随着宽跨比的增加,各纵梁沿横截面承担的弯矩逐渐趋于均匀,各纵梁承担的应力相对平均偏差增大,空间效应明显;与增加箱室宽度而变宽的主梁相比,通过增加箱室数量而变宽的主梁的挠度与弯矩分布更加均匀。The effect of the width-to-span ratio on the mechanical characteristics of a large widened continuous box girder bridge is investigated.This study is based on the actual project of widening prestressed concrete continuous girder bridge for the expansion and interchange ramp of Changyi expressway in Hunan province.A grillage model and a single beam model for a continuous box-girder bridge with sharply variable width are established to analyze its bending moment,deflection and stress.The results show that under the combined effects of self-weight and secondary loads,as the width-tospan ratio increases,the moments borne by each longitudinal beam along the cross-section gradually become more uniform.However,the relative deviation in stress distribution among the longitudinal beams increases,indicating significant spatial effects.Compared to widening the main beam by increasing the width of the chambers,widening the main beam by increasing the number of chambers results in a more uniform distribution of deflection and bending moment.

关 键 词：连续箱梁桥 异型结构 梁格法 宽跨比 有限元模型 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]