大跨钢—混混合连续梁桥参数敏感性研究  

Research on Sensitivity of Parameters for Large-span Steel-concrete Hybrid Continuous Girder Bridge

作　　者：翟晓亮[1] 袁卓亚 黄博 向正松 ZHAI Xiao-liang;YUAN Zhuo-ya;HUANG Bo;XIANG Zheng-song(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China;Sichuan Road and Bridge Construction Group Co.Ltd.,Chengdu 610041,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075 [2]四川公路桥梁建设集团有限公司,成都市610041

出　　处：《公路》2025年第1期176-183,共8页Highway

基　　金：陕西省交通运输厅2022年度交通科技项目,项目编号22-30k。

摘　　要：为了探究大跨钢—混混合连续梁桥主要结构参数对结构受力性能影响的敏感性,依托某钢—混混合连续梁桥分析了中跨钢梁长度、边中跨比、支点截面高跨比、跨中截面高跨比对桥梁结构静动力性能的影响。研究结果表明,中跨钢梁长度和边中跨比对边跨跨中和钢混结合段截面弯矩影响较大;中支点梁高与主跨跨径比值、主跨跨中梁高与主跨跨径比值仅对钢混结合段弯矩影响最大;中跨钢梁长度、边中跨比分别对钢混结合段、边跨跨中截面竖向位移影响显著;中跨钢梁长度与中跨跨径比值变化对结构前五阶振动频率影响较小,变化幅度均在10%以内,但是结构振动频率与边中跨比成反比。综合考虑关键结构性能参数对结构动静力性能的影响,中跨钢梁长度与中跨跨径比值宜取0.45~0.5,边中跨比宜取0.5左右,中支点梁高与主跨跨径比值宜取1/21~1/20,主跨跨中梁高与主跨跨径比值宜取1/42~1/40。To explore the sensitivity of the main structural parameters of large-span steel-concrete continuous girder bridges to the structural load-bearing performance,based on a certain steel-concrete continuous girder bridge,the effects of the mid-span steel beam length,the ratio of side to mid-span,the height-to-span ratio at the support points,and the height-to-span ratio at the mid-span on the static and dynamic performance of the bridge structure are analyzed.The research results show that:the length of the mid-span steel beam and the ratio of side to mid-span have a significant impact on the bending moment at the mid-span of the side span and the section of the steel-concrete junction;the ratio of the height of the beam at the mid-support to the main span and the ratio of the height of the beam at the mid-span to the main span only have the greatest impact on the bending moment at the steel-concrete junction section;and,the length of the mid-span steel beam and the ratio of side to mid-span significantly affect the vertical displacement at the section of the steel-concrete junction and the mid-span of the side span.The variation of the ratio of the length of the mid-span steel beam to the mid-span span has a small impact on the first five vibration frequencies of the structure,with the change range within 10%,but the structural vibration frequency is inversely proportional to the ratio of side to mid-span.Considering the impact of key structural performance parameters on the static and dynamic performance of the structure comprehensively,the ratio of the length of the mid-span steel beam to the mid-span span should be taken between 0.45 and 0.5,the ratio of side to mid-span should be around 0.5,the ratio of the height of the beam at the mid-support to the main span should be between 1/21 and 1/20,and the ratio of the height of the beam at the mid-span to the main span should be between 1/42 and 1/40.

关 键 词：桥梁工程 钢—混混凝土连续梁桥 钢梁长度 边中跨比 截面高跨比 结构静动力性能 

分 类 号：U448.225[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]