钢-UHPC组合梁纵向抗剪性能试验研究  

Experimental Study on Longitudinal Shear Performance of Steel-UHPC Composite Bridge Girder

作　　者：甘小平 袁星 邓开来 赵灿晖[1] 周浩 GAN Xiao-ping;YUAN Xing;DENG Kai-lai;ZHAO Can-hui;ZHOU Hao(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China 19th Metallurgical Group Co.,Ltd.,Chengdu Sichuan 610014,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan Hubei 430040,China;CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100120,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国十九冶集团有限公司,四川成都610014 [3]中交第二航务工程局有限公司,湖北武汉430040 [4]中交公路长大桥建设国家工程研究中心有限公司,北京100120

出　　处：《公路交通科技》2023年第8期102-110,共9页Journal of Highway and Transportation Research and Development

基　　金：四川省科技计划项目(2022NSFSC0441);中国交建建设股份有限公司科技研发项目(2020-ZJKJ-PTJS13);中交二航局科技研发项目(20190730-013)。

摘　　要：钢-超高性能混凝土(UHPC)组合梁的纵向抗剪性能严重影响组合梁的正常使用和结构安全性。为探究钢-UHPC组合梁的纵向抗剪性能,完善钢-UHPC组合梁中UHPC板的纵向抗剪承载能力计算公式,对2个钢-UHPC组合梁试件展开了四点弯曲试验,通过试验观测得到该组合梁的开裂损伤模式、荷载-挠度曲线、钢-混界面滑移发展等结构行为。在试验研究的基础上,基于Abaqus中混凝土塑性损伤模型建立了该组合梁的有限元模型,通过将有限元模拟得到的荷载-挠度曲线与试验得到的结果对比,证明了该有限元模型的正确性。基于该数值模型,通过参数分析确定了UHPC板中斜压杆发展角度,给出了斜压杆发展角度的拟合公式。基于传统的钢筋混凝土拉压杆理论,考虑UHPC抗拉强度,修正了钢-UHPC组合梁纵向抗剪承载能力计算公式。结果表明:布置纵向双排栓钉的钢-UHPC组合梁,UHPC板纵向剪切裂缝呈八字形延伸发展,其裂缝发展形式与相同栓钉布置方式的普通混凝土板相似;钢-混凝土组合梁采用UHPC翼缘板,拉-压杆模型中压杆与拉杆的承载力均得到提高,能有效提高混凝土板纵向抗剪承载能力;通过与数值结果对比,证明修正的钢-UHPC组合梁的纵向抗剪承载力计算公式具有良好的精度。The longitudinal shear performance of steel-UHPC composite girders seriously affects the normal use and structural safety of composite girders.In order to investigate the longitudinal shear performance and improve the theoretical calculation formula of the longitudinal bearing capacity of UHPC slab in steel-UHPC composite girders,four-point bending test on 2 steel-UHPC composite girder specimens is conducted.The cracking damage mode,load-deflection curve and structural behaviors such as slip development at the steelconcrete interface are obtained by experimental measurement.On the basis of the experimental study,the finite element model of composite girders is established based on the concrete plastic damage model in Abaqus.The correctness of the finite element model is proved by the comparison between the load-deflection curves of the calculation result and the experimental result.Based on the numerical model,the development angle of diagonal strut in UHPC slab is determined by parameter analysis,and the fitting formula of the development angle is given.Based on traditional reinforced concrete strut-and-tie theory and considering the tensile strength of UHPC,the calculation formula of the longitudinal shear bearing capacity of steel-UHPC composite girder is revised.The result shows that(1)the longitudinal shear cracks of UHPC slab in steel-UHPC composite girder with double-row studs in longitudinal direction extended and developed in splayed shape,and the cracking development is similar to that of ordinary concrete slab with the same stud arrangement;(2)the adoption of UHPC flanges in steel-concrete composite girder can improve the bearing capacity of the load-bearing capacity of the struts and ties in the strut-and-tie model,and can improve the bearing capacity of the UHPC slab;(3)compared with the numerical analysis result,it is proved that the revised calculation formula of the longitudinal shear bearing capacity of steel-UHPC composite girder has good accuracy.

关 键 词：桥梁工程 承载力计算公式 试验研究 钢-UHPC组合梁 纵向抗剪 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]