多跨连拱桥边墩钢-混结合段的区域力学行为分析  

Study of Regional Mechanical Behavior of the Steel-Composite Section of the Arch Footing

作　　者：梁栋 熊章豪 彭亚荣 孙永方 LIANG Dong;XIONG Zhanghao;PENG Yarong;SUN Yongfang(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin,China,300401;Hebei Province Expressway Jingxiong Planning and Construction Office,Baoding,China,071700;CCCC Third Highway Engineering Bureau Co.Ltd.,Beijing,China,101304)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]河北省高速公路京雄筹建处,河北保定071700 [3]中交第三公路工程局有限公司,北京101304

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第2期263-270,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51978236);河北省交通运输厅科技计划项目(JX-202019)。

摘　　要：目的 研究上承式多跨钢箱连拱桥边墩钢-混结合段区域力学性能。方法 以白沟河特大桥为背景,基于有限元仿真分析和实桥测试的方法,对承受斜向力的连拱桥边墩区域力学形为进行研究。分析构件局部区域的应力,研究不考虑承压板的作用、不考虑开孔钢板端部承压的作用、不考虑PBL连接件的作用等情况下对局部区域应力的影响规律。结果 通过有限元结果对拱脚钢-混结合段进行应力区域划分,将三个应力区域产生的效应力分别定义为劈裂力T_(b,d)、剥裂力T_(s,d)、边缘拉力T_(et,d)。不考虑承压板的作用时,内部接触面的剥裂力T_(s,d)增幅最大,为18.4%;不考虑开孔钢板端部承压作用时,边缘交界处的边缘拉力T_(et,d)增幅最大,为30.6%;不考虑PBL连接件的作用时,边缘交界处的边缘拉力T_(et,d)增幅最大,为31.4%。与既有研究不同的是钢箱拱肋斜插入大体积混凝土中,由于体积差异大又是斜向,因此内力传递扩散更迅速。结论 笔者所提的应力区域为内部裂缝易出现区域,研究结果可为防止混凝土出现结构裂缝提供技术依据。To study the regional mechanical properties of the steel-mixed section of the side pier of the upper bearing multi-span steel box double-arch bridge.Taking the Baigou River Bridge as the background,based on the finite element simulation analysis and the actual bridge test method,the mechanical shape of the side pier area of the multi-arch bridge under oblique force was studied,and the local and regional stress of the components was analyzed.The influence law of local and regional focus is studied without considering the effect of pressure plate,the impact of open plate end pressure,and the development of PBL connector.The stress regions of the steel-mixed section were divided by finite element method,and the influential forces of the three stress regions were defined as splitting party,peeling force,and edge tension,respectively.Without considering the effect of the pressure plate,the increase of the cracking strength of the internal contact surface is the largest,which is 18.4%.The edge tension at the edge junction has the most significant expansion of 30.6%without considering the pressure acting at the end of the open plate.Without considering the effect of the PBL connector,the edge tension at the edge junction increases the most,31.4%.Unlike the existing research,the steel box arch rib is inserted into the large volume of concrete transversely because of the significant volume difference and diagonal direction,so the internal force transfer and diffusion are more rapid.The stress area mentioned by the author is prone to internal cracks,and the research results provide the technical basis for preventing structural cracks in concrete.

关 键 词：桥梁工程 钢箱连拱桥 钢-混结合段 有限元分析 

分 类 号：TU997[建筑科学—市政工程] U448.22[建筑科学—桥梁与隧道工程]