变截面波形钢腹板连续梁的抗弯性能试验研究  

Experimental study on the flexural performance of a continuous beam with variable section corrugated steel webs

作　　者：赵品 韩恒涛 荣学亮 陈伟 ZHAO Pin;HAN Hengtao;RONG Xueliang;CHEN Wei(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043

出　　处：《哈尔滨工程大学学报》2023年第3期425-433,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51508348);河北省自然科学基金项目(E2017210191,E2017210183);河北省教育厅项目(QN2015134).

摘　　要：为研究变截面波形钢腹板连续组合箱梁的抗弯性能,本文使用液压伺服系统通过逐级加载的方式,对一片三跨波形钢腹板连续模型梁进行了静力试验,研究了在对称荷载与偏心荷载作用下波形钢腹板连续箱梁的破坏模态和变形、不同截面上应变分布、体外预应力束增量以及极限承载力等,从而明确波形钢腹板连续组合箱梁的破坏失效过程。研究结果表明:在弹性范围内,边跨与中跨的混凝土顶底板纵向应变呈线性变化,符合箱梁理论中提出的“拟平截面”假定;中跨偏载作用下,边跨处的偏载效应大于中跨,这不仅与边跨跨径较短有关,同时与横隔板数量和位置有关。试验梁的开裂荷载为破坏荷载的30%,中跨与边跨挠度变化速率均在底板混凝土开裂后变大,边跨跨中混凝土顶底板应变在中支座开裂后应变发生突变,增长速率变大,并一直持续至加载结束;最终破坏时刻,在中跨加载点位置混凝土顶底板出现斜向裂缝并发生断裂,钢腹板发生屈曲破坏;体外预应力筋在破坏阶段承载了较高的应力,对模型梁的抗弯性能贡献较大。试验研究成果可为波形钢腹板连续组合箱梁的工程应用提供一定参考。To examine the flexural performance of a continuous composite box girder with variable-section corrugated steel webs,the hydraulic servo system is used by the way of step loading,static failure tests were performed on a contin-uous model girder with three-span corrugated steel webs,obtaining the failure modes and deformation,strain distribution on different sections,increment of external prestressing tendons,and ultimate bearing capacity of the continuous box girder with corrugated steel webs under symmetrical and eccentric loads.Accordingly,the failure process of the continu-ous composite box girder with corrugated steel webs was clarified.Research results show the following:In the elastic range,the longitudinal strain of the concrete top and bottom of the side span and middle span linearly varies,which is in accordance with the“dummy horizontal section assumption”proposed in beam theory.The eccentricity effect at the side span is larger than that at the middle span under a partial load,which is related not only to the shorter side span but also to the number and location of the diaphragm.The cracking load of the box girder is 30%of the failure load,and the var-iation rate of the deflection of the middle span and side span increases after the cracking of the bottom concrete.The strain of the concrete top and bottom of the side span in the middle suddenly changes after the cracking of the middle bearing.Then,the growth rate increases,and it continues until the end of loading.In the final failure moment,oblique cracks and fractures occurred on the concrete top and bottom plate at the mid-span loading point,and a buckling failure occurred on the steel web.The prestressing tendons bear high stress in the failure stage and greatly contribute to the flex-ural performance of the continuous composite model beam.The experimental results can provide some reference for the engineering application of continuous composite box girders with corrugated steel webs.

关 键 词：桥梁工程 波形钢腹板箱梁 变截面连续梁 模型试验 抗弯性能 体外预应力 极限状态 破坏失效 

分 类 号：U442[建筑科学—桥梁与隧道工程]