平面布索斜跨拱桥设计参数敏感性分析  

Sensitivity Analysis of Several Design Parameters for Diagonal Arch Bridges with Planar Cables

作　　者：卢雄强 郝柏青 刘顺发 李新平[2] LU Xiongqiang;HAO Boqing;LIU Shunfa;LI Xinping(uangdong Dadao Testing Technology Co.,Ltd.,Zhongshan Guangdong 528400,China;South China University of Technology,Guangzhou Guangdong 510641,China)

机构地区：[1]广东大道检测技术有限公司,广东中山528400 [2]华南理工大学,广东广州510641

出　　处：《广东公路交通》2024年第3期28-33,65,共7页Guangdong Highway Communications

摘　　要：平面布索斜跨拱桥的吊杆一端锚固在拱肋的拱顶区域,另一端锚固在主梁的中线上,所有吊杆位于同一个平面内。这种平面布索斜跨拱桥设计新颖,不仅其拱梁结构受力明确,而且外观简洁优美,车辆行驶的通视性好。为了研究该斜跨拱桥的设计参数的取值对结构静力特性的影响,本文以中山市一座平面布索的斜跨拱桥为工程背景,通过建立空间杆系有限元模型,对拱肋刚度、吊杆下锚固点间距、拱轴线水平投影与主梁中心线的夹角等三个设计参数的敏感性进行了分析。研究结果表明:在移动荷载作用下,拱肋刚度变化对拱的内力和变形影响较为明显,而对主梁弯矩和挠度的影响较小;吊杆下锚固点间距的增大将导致拱的内力减小,使主梁的跨中弯矩增大;拱轴线水平投影与主梁中心线的夹角在15°~27°范围内变化则对拱与主梁的内力和位移没有明显的影响。本文研究成果可为该类桥梁的初步设计提供有益的参考。The cables of diagonal arch bridges with planar cables are arranged at one end in the arch crown area of the arch rib,and at the other end on the centerline of the main beam,all cable are located within one plane.This novel design of diagonal arch bridges with planar cables not only ensures a clear force distribution on the archbeam structure,but also presents a clean and beautiful appearance with good visibility for vehicle driving.In order to investigate the influence of design parameter values on the structural static characteristics of the diagonal arch bridge,this paper takes a diagonal arch bridges with planar cables in zhongshan city as the engineering background.By establishing a spatial rod finite element model,the sensitivity of three design parameters,including arch rib stiffness,anchor point spacing under the cables,and the angle between the horizontal projection of arch axis and the centerline of the main beam,is analyzed.The research results indicate that under moving loads,changes in arch rib stiffness have a significant impact on the internal force and deformation of the arch,while their impact on the mid span bending moment and deflection of the main beam is relatively low.And the increase in the spacing between anchor points under the cables leads to a decrease in the internal force of the arch,while the mid span bending moment of the main beam increases.The variation of the angle between the horizontal projection of the arch axis and the centerline of the main beam within the range of 15°to 27°has insignificant effect on the internal force and deformation of arch and the main beam.The results obtained in this study provide useful references for the preliminary design of similar bridges.

关 键 词：斜跨拱桥 杆系有限元分析 敏感性分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]