钢混组合桥面小型剪力钉抗剪性能研究  

Study on Shear Resistance Performance of Small Shear Studs in Steel-Concrete Composite Deck

作　　者：杨仕力 施洲[2] 吴科龙 YANG Shili;SHI Zhou;WU Kelong(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]成都大学建筑与土木工程学院,成都610106 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2025年第1期96-103,共8页Railway Standard Design

基　　金：中国国家铁路集团有限公司科技研究开发计划重大课题(N2021G034)。

摘　　要：为研究钢混组合梁小型剪力钉的抗剪性能,对4组不同参数的小型剪力钉连接件进行推出试验,考察其破坏模式、承载能力、荷载-滑移关系及荷载-应变关系,并基于试验结果对既有承载能力计算公式及刚度预测公式的适用性进行评估。结果表明,试件破坏模式与剪力钉和混凝土的相对刚度有关,剪力钉直径较小时,破坏模式为剪力钉剪断,剪力钉直径较大时,破坏模式为混凝土板破坏;剪力钉直径越大,承载能力越高,但延性越差;增加剪力钉的长度可显著提高试件的承载能力并延长试件刚度衰减过程;剪力钉长度由40 mm增加到60 mm时,承载能力Pu提高约16.7%,峰值荷载对应的滑移Su下降约25.3%,极限滑移Sm增加38.5%;小型剪力钉连接件混凝土板裂纹发展形态及破坏模式与常规剪力钉深埋推出试件存在明显差异;中、美规范中承载能力计算公式误差较大,日本和欧洲规范承载能力计算公式在不考虑安全系数时,计算值与实测值的平均比值分别为0.94、1.09,能够较好地预估承载能力,建议采用该方法进行承载能力计算;弹性阶段是剪力钉推出试件刚度最大的阶段,中国规范推荐的刚度计算公式可用于预测小型剪力钉的抗剪刚度;剪力钉处于弯-拉-剪共同作用下,但以受剪为主。The shear resistance performance of small shear stud in steel-concrete composite deck is examined through a series of push-out tests,involving four different small shear stud connectors.Particularly,the failure modes,load capacity,load-slip relationships,and load-strain relationships are explored.The applicability of current formulas used to predict bearing capacity and rigidity is evaluated based on test results.The results show that the failure mode is related to the relative rigidity between the shear stud and the concrete.Small-diameter studs tend to shrink,while larger-diameter studs lead to concrete failure.However,lengthening the shear stud can significantly enhance the bearing capacity and prolong the stiffness decay process of the shear stud connectors.When the length of the shear stud increases from 40 mm to 60 mm,the bearing capacity Pu increases by about 16.7%while the slip Su corresponding to the peak load decreases by about 25.3%,and the ultimate slip Sm increases by 38.5%.Additionally,the patterns of crack formation and failure modes in concrete slabs with small shear stud connectors deviate from those observed in traditional deep-embedded shear stud push-out samples.The existing capacity calculation formulas,as per Chinese and American standards,demonstrates substantial discrepancies.In contrast,as per Japanese and European standards,the ratios of calculated values to the tested values are average 0.94 and 1.09 respectively without considering the safety factor,offering better estimations of bearing capacity.It is recommended to use these methods for bearing capacity calculation.Lastly,the connector’s rigidity in elastic stage is the greatest and the recommended formula in the Chinese specification could be effectively used to predict shear rigidity.Even though shear studs are subjected to a combination of bending,tension,and shearing forces,the shear force is the primary factor.

关 键 词：钢混组合桥面 小型剪力钉 抗剪性能 推出试验 破坏模式 承载能力 抗剪刚度 

分 类 号：U24[交通运输工程—道路与铁道工程] U448.38[建筑科学—桥梁与隧道工程]