波形钢腹板箱梁正弯矩区的受力性能研究  

Study on Mechanical Property of Sagging Moment Region of Box Girder with Corrugated Steel Web

作　　者：庞建利 毛云程 PANG Jian-li;MAO Yun-cheng(School of Civil Engineering,Northwest Minzu University,Lanzhou,Gansu 730124,China)

机构地区：[1]西北民族大学土木工程学院,甘肃兰州730124

出　　处：《公路交通科技》2024年第5期87-96,107,共11页Journal of Highway and Transportation Research and Development

基　　金：中央高校基本科研业务费项目(31920220052)。

摘　　要：为研究预应力波形钢腹板组合梁正弯矩区的破坏形态和受力特性,完善其理论分析体系。首先,以甘肃某高速公路波形钢腹板组合梁桥为工程背景,将预应力钢筋强度和配筋率设为变化参量,设计制作了3片缩尺比例为1∶3的预应力波形钢腹板节段试验梁进行了正弯矩区抗弯性能试验;其次,通过有限元软件Abaqus 2020分析了波形钢腹板在沿梁长方向的剪应力分布以及混凝土顶板的横向压应力分布情况。结果表明:试验梁屈服前,最大裂缝宽度满足相关规范规定的0.15 mm;配筋强度对预应力波形钢腹板组合梁的纵向挠度影响不大,而增加配筋率可以改善梁体的受力性能,有效减小试件的挠度变形。当试验梁达到屈服后,相较于配筋率,配筋强度对预应力筋内力增长影响更显著;当荷载水平较高时,试验梁的纵向应变在波形钢腹板和下翼缘板处发生突变,增加配筋率可以降低预应力波形钢腹板组合梁横截面的纵向应变。有限元计算结果表明,波形腹板处的剪应力在远离支座和横隔板区域较大,其余位置处则较小。剪应力在距离支座和横隔板约0.5 m范围内逐步减小为最大值的75%左右;混凝土顶板的横向应力分布较均匀,基本可以忽略试件的剪力滞效应。文中所采用的试验方法及试验结果可为同类桥梁受力性能分析提供参考。To investigate the failure mode and mechanical property of sagging moment region of composite girder with prestressed corrugated steel webs,and to enhance the theoretical analysis system,a series of experiments are conducted to evaluate the flexural performance of sagging moment region.Firstly,a composite girder bridge with corrugated steel webs on an expressway in Gansu province is selected as the engineering background.Subsequently,3 test girders with prestressed corrugated steel webs with a scale of 1∶3 are designed and made for testing the flexural performance in sagging moment region.Furthermore,the finite element software ABAQUS is used to conduct an analysis on shear stress distribution along the length of girder with corrugated steel webs,as well as the lateral compressive stress distribution of concrete slabs.The result indicates that before the girder yields,the maximum crack width meets 0.15 mm specified in relevant specifications.The reinforcement strength has little effect on the longitudinal deflection of composite box girder with prestressed corrugated steel web,while increasing the ratio of reinforcement can improve the mechanical performance of girder,and reduce the deflection deformation of specimen effectively.When the test beam reaches yield,the effect of reinforcement strength on increase of internal force is more significant than that of reinforcement ratio.When the load level is high,a sudden change occurs at the longitudinal strain of corrugated steel web and lower flange for test girder,and increasing the reinforcement ratio can reduce longitudinal strain in the cross-section of composite box girder with prestressed corrugated steel web.Finite element calculation result indicates that the shear stress at corrugated steel web is larger in the area away from supports and diaphragms,and smaller at other locations whilst shear stress gradually reduces to about 75% of the maximum value within a range of 0.5 m from the support and diaphragm.The lateral stress distribution of concrete slab is

关 键 词：桥梁工程 波形钢腹板 试验研究 组合梁 预应力 受力性能 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]