波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭性能研究  

Research on the torsional behavior of composite girders with CSW-CFST truss chords

作　　者：黄汉辉[1] 陈康明[1,2] 吴庆雄[1,2] 中村聖三 董桔灿 Huang Hanhui;Chen Kangming;Wu Qingxiong;Nakamura Shozo;Dong Jucant(School of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou University,Fuzhou 350116,China;Nagasaki University,Nagasaki 852-8521,Japan;Shenzhen Municipal Design and Research Institute Co.,Ltd.,Shenzhen 518029,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]福州大学福建省土木工程多灾害防治重点实验室,福建福州350116 [3]长崎大学,日本长崎852-8521 [4]深圳市市政设计研究院有限公司,广东深圳518029

出　　处：《土木工程学报》2023年第10期93-104,126,共13页China Civil Engineering Journal

基　　金：国家重点研发计划(2017YFE0130300);国家自然科学基金(52078137);福建省自然科学基金杰青项目(2019J06009)。

摘　　要：以波形钢腹板-钢管混凝土桁式弦杆组合梁为研究对象,开展抗扭性能试验和理论分析,并与波形钢腹板-钢管桁式弦杆组合梁和波形钢腹板-钢管混凝土弦杆组合箱梁抗扭性能进行对比;研究波形钢腹板-钢管混凝土桁式弦杆组合梁的扭曲破坏形态、截面类型、管内混凝土对组合梁抗扭性能的影响,并探讨波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭承载能力计算方法。结果表明,波形钢腹板-钢管混凝土桁式弦杆组合梁可等效为闭口箱形截面。扭曲破坏形态为混凝土桥面板沿与梁轴线呈45°方向斜向开裂,且纵向钢筋发生屈服。管内混凝土对组合梁抗扭刚度和抗扭承载能力具有一定的贡献度。基于线性刚度叠加方法,提出钢管混凝土组合抗扭刚度计算方法。根据波形钢腹板-钢管混凝土桁式弦杆组合梁可能发生的四种扭曲破坏形态,提出波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭承载能力计算方法,并将采用该文所提出的组合梁抗扭承载能力计算方法得到的理论计算结果与试验和有限元分析结果进行对比,误差不超过8.5%。Taking composite girders with corrugated steel webs and concrete-filled steel tubular(CSW-CFST)truss chords as the research object,the torsional behavior tests and theoretical analysis on the composite girders were conducted,in comparison with those of composite girders with corrugated steel webs and circular hollow section(CSW-CHS)truss chords and composite box girders with CSW-CFST chords.The twist failure mode,the sectional form,and the influence of the concrete in chord on the torsional behavior of composite girders above were studied.Furthermore,the calculation method for the torsional bearing capacity of composite girders was discussed.Results show that the cross section of composite girders with CSW-CFST truss chords can be equivalent to the closed box cross section.The twist failure mode is that the concrete bridge deck slab cracks obliquely along the direction of 45°with respect to the axis of composite girders,accompanied with the yielding longitudinal rebar.The concrete in chord contributes to the torsional stiffness and bearing capacity of composite girders to some extent.Based on the linear superposition method of the stiffness,the calculation method for the composite torsional stiffness of CFST specimen is established.For the four twist failure modes possibly occurring in composite girders with CSW-CFST truss chords,the calculation method for the torsional bearing capacity was put forward.Moreover,the deviation between the results from the calculation method for the torsional bearing capacity put forward in the present study and those from the tests and finite element analysis is not more than 8.5%.

关 键 词：组合梁 波形钢腹板 钢管混凝土桁式弦杆 试验 理论分析 抗扭性能 计算方法 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1