钢-混工字组合简支梁桥静动载试验及冲击系数研究  

Research on static and dynamic load test and impact coefficient of steel-concreteⅠ-shaped composite simply supported beam bridge

作　　者：王荣霞 董天啸 万田宝 方芳 WANG Rongxia;DONG Tianxiao;WAN Tianbao;FANG Fang(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Hebei Qiancao Expressway Development Co.,Ltd.,Tangshan 063700,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]河北迁曹高速公路开发有限公司,唐山063700

出　　处：《建筑结构》2025年第2期98-105,共8页Building Structure

基　　金：国家自然科学基金面上项目(51778206);河北省交通运输厅科技项目(QC2018-7);廊坊市科技支撑计划项目(2019013115)。

摘　　要：近年来钢-混工字组合简支梁桥因其能充分发挥不同材料特性而被广泛应用,但评价动力特性的重要指标———冲击系数的计算尚缺少相关试验积累和理论研究。以一座新建钢-混工字组合简支梁桥为依托,详细介绍了该桥的静载试验以及脉动、跑车、跳车等动载试验过程,探讨了此类结构冲击系数的试验计算值,并与各规范计算值进行了对比。结果表明:该桥整体刚度好,承载安全度高;冲击系数的试验计算值多数大于各规范计算值,采用规范设计相对不安全;跨中冲击系数试验计算平均值等于我国规范《公路桥涵设计通用规范》(JTG D60—2015)计算值,但也出现了试验值大于规范值的情况。因此,今后进行高速公路30m跨径钢-混工字组合简支梁桥设计时,应对桥梁跨中冲击系数适当放大。In recent years,steel-concreteⅠ-shaped composite simply supported beam bridges have been widely used because the full use of different material properties.However,the calculation of impact coefficient,an important index to evaluate dynamic characteristics,still lacks relevant experimental accumulation and theoretical research.Based on a new steel-concreteⅠ-shaped composite simply supported beam bridge,the static load test and the dynamic load test process such as pulsation,running car and jumping car were introduced in detail.The experimental calculation values of the impact coefficient of this kind of structure were discussed and compared with the calculated values of various codes.The results show that the bridge has good overall stiffness and high bearing safety.Most of the experimental values of the impact coefficient are larger than the calculation results of the codes,and it is relatively unsafe to adopt the code design.The average value of the mid-span impact coefficient test calculation is equal to the calculated value of the General specifications for design of highway bridges and culverts(JTG D60—2015)in China,but there are also cases where the test value is greater than the standard value.Therefore,in the design of 30m span steel-concreteⅠ-shaped composite simply supported beam bridge of Highway in the future,the impact coefficient of bridge mid-span should be appropriately enlarged.

关 键 词：钢-混组合简支梁桥 工字钢 冲击系数 静载试验 动载试验 

分 类 号：TU398.9[建筑科学—结构工程]