摘要
为了得到大跨度公路工程挠跨比的合理限值,以国内某在建大跨度公路悬索桥作为研究对象。首先,通过有限元方法对不同构件的结构刚度及重力刚度进行敏感性分析,确立了刚度调控方法;其次,将行车安全性及舒适性作为评判指标,调整刚度大小进行多工况车-桥分析,获取行车安全性及舒适性超出限值的刚度取值范围;最后,缩减刚度的折减幅度,直至行车安全性及舒适性结果达到限值,通过反推得到基于行车性能的主梁挠跨比限值。研究结果表明:大跨度公路悬索桥竖向结构刚度主要由主梁及主缆控制,横向结构刚度主要由主梁及桥塔控制;折减主梁和主缆的结构及重力刚度均会对总体刚度产生较明显的影响,但影响程度不同;大跨度公路悬索桥在满足行车安全性及舒适性的条件下主梁的竖向和横向挠跨比限值分别约为1/150、1/80。
Here,to obtain a reasonable limit value for deflection-span ratio of a large-span highway suspension bridge,a certain domestic suspension bridge under construction was taken as the study object.Firstly,the sensitivity analyses for structure and gravity stiffnesses of different components were performed with the finite element method to establish the stiffness regulation method.Secondly,taking driving safety and driving comfort as evaluation indexes,stiffness sizes were adjusted for multi-working condition vehicle-bridge analysis to obtain range of stiffness values exceeding limit values of driving safety and driving comfort.Finally,the stiffness reduction amplitude was reduced until driving safety and driving comfort results could reach their limit values and the bridge deflection-span ratio limit value could be obtained based on driving performance using reverse deduction.The study results showed that vertical structural stiffness of suspension bridge is mainly controlled by main beam and main cable,while its lateral structural stiffness is mainly controlled by main beam and bridge tower;reducing structural stiffness and gravity stiffness of main beam and main cable can more obviously affect the overall stiffness,but their affecting degrees are different;limit values for vertical and lateral deflection-span ratios of main beam of a super large-span highway suspension bridge are approximately 1/150 and 1/80,respectively under conditions to satisfy driving safety and driving comfort.
作者
张太科
柳文策
郭峰超
陈上有
王茂强
ZHANG Taike;LIU Wence;GUO Fengchao;CHEN Shangyou;WANG Maoqiang(Guangdong Provincial Highway Construction Co.,Ltd.,Guangzhou 510100,China;Guangdong Greater Bay Area Transportation Construction Investment Co.,Ltd.,Guangzhou 510100,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100011,China)
出处
《振动与冲击》
北大核心
2025年第15期11-18,共8页
Journal of Vibration and Shock
基金
中国交通建设集团有限公司科技项目(YSZX-01-2021-01-B,YSZX-01-2022-03-B,2021-ZJKJ-01)
广东省交通集团科技项目(JT2023ZD01-01)。
关键词
大跨度公路悬索桥
挠跨比限值
刚度调控
行车安全性
行车舒适性
large-span highway suspension bridge
limit value of deflection-span ratio
stiffness regulation
driving safety
driving comfort
