大跨波形钢腹板连续箱梁桥有效分布宽度研究  

Study on Effective Distribution Width of Long-span Continuous Girder Bridge with Corrugated Steel Webs

作　　者：刘旭政[1] 程坤[1,2] 吴刚 荆伟伟 LIU Xu-zheng;CHENG Kun;WU Gang;JING Wei-wei(School of Civil Engineer and Architecture,East China Jiaotong University,Nanchang Jiangxi 330013,China;Hubei Transport Investment Intelligent Inspection Co.,Ltd.,Wuhan Hubei 430051,China;Jiashan County Transport Bureau,Jiaxing Zhejiang 314100,China)

机构地区：[1]华东交通大学土木建筑工程学院,江西南昌330013 [2]湖北交投智能检测股份有限公司,湖北武汉430051 [3]嘉善县交通运输局,浙江嘉兴314100

出　　处：《公路交通科技》2022年第2期85-92,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52068026,52068025);浙江省交通运输厅科技计划项目(2021034)。

摘　　要：波形钢腹板组合箱梁桥与钢筋混凝土箱梁桥一样,箱梁翼板也存在剪力滞效应。为研究大跨度变截面波形钢腹板组合连续箱梁的剪力滞效应,采用ANSYS的APDL参数化建模方法建立了典型的三跨式波形钢腹板组合连续箱梁桥的有限元模型,计算分析了集中(均布)荷载作用下变截面箱梁几何参数(腹板尺寸、宽高比、宽跨比、变截面)对于剪力滞系数的影响规律,明确了影响大跨度变截面波形钢腹板组合连续箱梁桥剪力滞效应的主要影响因素以及剪力滞效应影响范围,最后采用修正荷载计算得出了基于规范的有效分布宽度的修正系数。结果表明:宽跨比是影响变截面波形钢腹板组合箱梁剪力滞效应的主要因素,宽高比、腹板尺寸对箱梁的剪力滞效应影响较小;等截面连续箱梁与变截面连续箱梁的剪力滞效应存在较大差异,集中荷载作用下,等截面箱梁顶板剪力滞系数大于变截面箱梁,底板剪力滞系数小于变截面箱梁;集中荷载作用下对箱梁剪力滞的纵向影响范围十分有限,仅限加载处及附近截面;集中荷载作用下中跨跨中截面及中墩墩顶截面的有效分布宽度修正系数取0.65,边跨跨中截面及边墩墩顶截面有效分布宽度修正系数取0.5。Like RC box girder bridge,the flanges of composite box girder bridge with corrugated steel webs have shear lag effect.In order to study the shear lag effect of long-span variable composite continuous beam bridge with corrugated steel webs,the finite element model of a typical 3-span composite continuous box girder bridge with corrugated steel webs is established by using the APDL parametric modeling method of ANSYS software.The influence of the geometric parameters(web size,width-height ratio,width-span ratio,and variable cross-section) of variable cross-sectional box girder on the shear lag coefficient under concentrated(uniformly distributed) loads is calculated and analyzed.The primary influencing factors and influence range of the shear lag effect are determined.Finally,the correction coefficient of effective distribution width based on specification is calculated by using modified load.The result shows that(1) Width-span ratio is the primary influencing factor of the shear lag effect of variable cross-sectional composite continuous girder with corrugated steel webs,width-height ratio and web size have little influence on the shear lag effect of box girder.(2) There is a big difference in the shear lag effect between constant sectional continuous box girder and variable sectional continuous box girder.Under concentrated load,the shear lag coefficient of the top slab of the constant sectional box girder is larger than that of the variable sectional box girder,while the shear lag coefficient of the bottom slab of the constant sectional box girder is smaller than that of variable sectional box girder.(3) The influence range on the shear lag effect of box girder is very limited under concentrated load,only the loading location and adjacent sections can be affected.(4)Under concentrated load,the corrected factor of effective distribution width of central span mid-span section and central pier top section is 0.65,and that of side span mid-span section and side pier top section is 0.5.

关 键 词：桥梁工程 剪力滞系数 荷载修正 波形钢腹板组合箱梁 有效分布宽度 

分 类 号：U442[建筑科学—桥梁与隧道工程]