多跨梁拱组合连续刚构桥设计参数分析  

Analysis on Design Parameters of Multi-span Beam Arch Composite Continuous Rigid-frame Bridge

作　　者：王安华 闫磊[2] 惠启祥 郭浩飞 WANG Anhua;YAN Lei;HUI Qixiang;GUO Haofei(SCEGC Mechanized Construction Group Company Ltd.,Xi′an 710032;Highway College,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communication,Chang′an University,Xi′an 710064)

机构地区：[1]陕西建工机械施工集团有限公司,西安710032 [2]长安大学公路学院旧桥检测与加固技术交通行业重点实验室,西安710064

出　　处：《公路交通技术》2024年第5期55-65,85,共12页Technology of Highway and Transport

基　　金：陕西省交通运输厅2021年度交通科研项目(21-63K)。

摘　　要：为研究多跨梁拱组合连续刚构桥关键设计参数对结构关键截面的应力和挠度影响规律,采用有限元数值模拟的方法,对一座在建梁拱组合连续刚构桥进行了参数对比研究。首先,分析组合体系的梁拱刚度比、主梁墩顶高跨比以及主墩抗推刚度比对结构的影响规律,并与同跨径的刚构桥进行对比,得到了关键设计参数的推荐取值范围;其次,对设计参数进行正交试验,得出不同目标函数下正交试验组合最优结果。结果表明:1)不同梁拱刚度比对钢箱拱肋的应力影响显著;2)随着高跨比的逐渐增大,2种不同结构体系主梁由混凝土徐变产生的挠度差异也逐渐增大;3) 2种结构体系随着抗推刚度比变化产生的挠度变化趋势具有较大的差异;4)由正交试验结果可知,最优的设计参数取值应将梁拱刚度比由58/1减小为45/1、主梁墩顶高跨比由9.5/170减小为8.5/170。In order to study the influence of key design parameters on the stress and deflection of critical sections in a multi-span beam arch continuous rigid-frame bridge,a comparative study of parameters was conducted using finite element numerical simulation on an under-construction beam arch continuous rigid-frame bridge.Firstly,the influence of the beam-arch stiffness ratio,main beam pier height-span ratio,and pier anti-thrust stiffness ratio on the structure was analyzed and was compared with a rigid frame bridge of the same span,obtaining the recommended range of values for the key design parameters.Secondly,orthogonal experiments were performed on the design parameters to obtain the optimal combination of orthogonal experimental results under different target functions.The results show that:1) Different beam-arch stiffness ratios significantly affect the stress of the steel box arch ribs;2) As the height-span ratio increases,the difference in deflection produced by concrete creep in the main beams of the two different structural systems also gradually increases;3) The deflection trends produced by changes in the pier anti-thrust stiffness ratio have significant differences between the two structural systems.4) According to the results of the orthogonal experiment,the optimal values of the design parameters should reduce the beam-arch stiffness ratio from 58/1 to 45/1 and the main beam pier height-span ratio from 9.5/170 to 8.5/170.

关 键 词：公路桥梁 梁拱组合体系 数值模拟 关键设计参数 正交设计 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]