外嵌钢板UHPC无腹筋梁抗剪性能试验研究  

Experimental study on shear behavior of non-stirrup UHPC beam encrusted with external steel plates

作　　者：李立峰[1,2] 侯淼 刘慈军 邵旭东[1,2] Li Lifeng;Hou Miao;Liu Cijun;Shao Xudong(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;Ningbo Highway Construction Management Center,Ningbo 315192,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082 [3]宁波市高等级公路建设管理中心,浙江宁波315192

出　　处：《土木工程学报》2025年第1期77-89,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(52278176,51978257)。

摘　　要：超高性能混凝土(ultra-high performance concrete,UHPC)构件通常设计为无腹筋梁等薄壁形式,以适应结构装配化的需求。为提高UHPC无腹筋梁的抗剪承载力并简化施工,提出外嵌钢板UHPC无腹筋梁的新型结构形式。选取钢板面积、间距、倾斜角度、单侧或双侧布置为试验参数,完成7片UHPC梁的抗剪性能试验,获得各试验梁的裂缝分布、破坏模式、抗剪承载力及剪切延性等结果。基于桁架-拱理论,提出外嵌钢板UHPC无腹筋梁的抗剪计算模型,推导了相应的计算公式。结果表明:外嵌钢板能够有效提升UHPC无腹筋梁的抗剪强度,斜裂缝均能越过钢板,钢板能起到和箍筋类似的作用;将箍筋分项抗剪贡献换算为等量钢板的外嵌钢板梁承载力略低于有腹筋梁,在同等用钢量下,钢板单、双侧布置对承载力影响不大;斜向钢板试件裂缝发展更为充分,双面外嵌钢板梁表现出较好的剪切延性;按桁架-拱理论的计算值与试验值之比为1.02,吻合较好。外嵌斜钢板梁表现出良好的结构性能,具有较好的研究潜力和应用前景。Ultra-high performance concrete(UHPC)components,such as non-stirrup beams,are usually designed in thin-walled forms to meet the needs of prefabricated structures.In order to improve the shear capacity of non-stirrup UHPC beams and simplify the construction,a new structural form of non-stirrup UHPC beams encrusted with external steel plates was proposed.Seven UHPC beams were tested for their shear performance with the area,spacing,inclined angle,and single or double side arrangement of steel plates taken as parameters,and the crack distribution,failure mode,shear capacity and shear ductility of the beams were obtained.Based on the truss-arch theory,a calculation model for the shear capacity of the non-stirrup UHPC beams encrusted with external steel plates was proposed,and the corresponding calculation formula was derived.The results showed that the externally encrusted steel plates can effectively improve the shear strength of non-stirrup UHPC beams,the diagonal cracks can cross the steel plates,and the steel plates can play a similar role as the stirrups.Converting the shear contribution of stirrups into equivalent steel plates,the bearing capacity of the beam encrusted with external steel plates was slightly lower than beam with stirrups.Under the same amount of steel,the single and double side arrangement of the steel plates had little effect on the bearing capacity.The cracks were more fully developed when arranging diagonal steel plates,and the beams encrusted with steel plates on both sides showed better shear ductility.According to the truss-arch theory,the ratio of the theoretical result to the experimental result was 1.02,indicating that they were in good agreement.The beam encrusted with diagonal steel plates exhibits good structural performance and has great research potential and application prospects.

关 键 词：UHPC梁 外嵌钢板 抗剪性能:桁架-拱模型 剪切延性 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]