简支蝶形腹板混凝土箱梁剪力滞效应  

Shear-lag Effect of Concrete Box Girder with Simply Supported Butterfly Web

作　　者：张云飞 焦广如 陈建兵[1] 蔡新江[1] ZHANG Yun-fei;JIAO Guang-ru;CHEN Jian-bing;CAI Xin-jiang(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011,China;Tongzhou Branch of Jiangsu Joint Vocational Technical College,Nantong,Jiangsu 226000,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]江苏联合职业技术学院通州分院,江苏南通226000

出　　处：《公路交通科技》2024年第9期123-131,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51778395);江苏省研究生科研与实践创新计划项目(SJCX21_1389,SJCX19_0837)。

摘　　要：为研究蝶形腹板混凝土箱梁的剪力滞效应分布情况,从试验研究、有限元模拟和理论推导3个方面对蝶形腹板混凝土箱梁的剪力滞效应进行研究。通过设计、制作蝶形腹板简支箱梁模型,并进行静力加载试验,以研究剪力滞效应在箱梁实腹处与空腹处的变化;建立与试验条件一致的Abaqus有限元模型,运用有限元的数据分析处理能力,得到蝶形腹板箱梁在集中荷载与分布荷载下的剪力滞效应空间分布情况;基于截面等效原理,提出箱梁空腹处惯性矩的计算方法,结合能量变分法,建立了蝶形腹板箱梁剪力滞效应计算公式并与试验结果和有限元结果进行对比,以验证公式的准确性。结果表明:蝶形腹板箱梁顶、底板纵向应力均呈正剪力滞效应分布且蝶形腹板箱梁空腹处截面剪力滞效应大于实腹处;在不同荷载作用下,蝶形腹板箱梁剪力滞效应空间分布状态为:沿梁长方向的剪力滞效应在箱梁支点截面和跨中截面较大,沿梁宽方向的剪力滞效应在腹板与顶板相交处较大,并向两侧逐渐减小;由变分法得到的理论公式计算结果表明,集中荷载作用下,变分法纵向应力值与试验值误差在―2.4%~7.4%,均布荷载作用下,变分法纵向应力值与有限元误差在―2.7%~3.8%,验证了公式的准确性,并为蝶形腹板箱梁设计提供了理论依据。To study the distribution of shear-lag effect of butterfly web concrete box girder,the shear-lag effect of butterfly web concrete box girder was studied from 3 aspects of experimental study,finite element simulation and theoretical derivation.The variations of shear-lag effect in the solid web and hollow web of box girder were studied by designing and fabricating the model of simply supported box girder with butterfly web and conducting the static loading test.ABAQUS finite element model was established,which was consistent with the test conditions.The spatial distribution of shear-lag effect of box girder with butterfly web under centralized and distributed loads was obtained by utilizing the data analysis and processing capability of finite element.Based on the principle of cross-section equivalence,the calculation method for inertia moment at hollow web of box girder was proposed.Combining with the energy variation method,the shear-lag effect calculation formula for box girder with butterfly web was set up.The formula was compared with the test results and finite element results to verify the accuracy.The result indicates that the longitudinal stresses in the top and bottom plates of box girder with butterfly web are positively distributed.The shear-lag effect on empty web is larger than that on solid web of box girder with butterfly web.The spatial distribution of shearlag effect of box girder with butterfly web under different loads is that along the girder length,the shear-lag effect is larger on the pivot section and mid-span section of girder;along the width of girder,the shear-lag effect is larger on the section at intersection of web and the top plate;along the width of girder is larger at the intersection of top and bottom plates.The theoretical formula obtained by using the variation method shows that the error between the longitudinal stress value with variation method and the test value is from―2.4%to 7.4%under the centralized load.The error between the longitudinal stress value with variation met

关 键 词：桥梁工程 剪力滞效应 能量变分法 蝶形腹板 有限元法 

分 类 号：U445.33[建筑科学—桥梁与隧道工程]