基于超高性能混凝土与普通混凝土优化Z形试件的界面抗剪性能  

Interface Shear Performance Based on Optimized Z-type UHPC-NC Specimens

作　　者：方钰 张大山[1] 王慧青 董毓利[1] 戴玉成 曾婷婷 FANG Yu;ZHANG Da-shan;WANG Hui-qing;DONG Yu-li;DAI Yu-cheng;ZENG Ting-ting(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;College of Architecture and Civil Engineering,Xiamen Institute of Technology,Xiamen 361021,China;Huada Engineering Technology(Xiamen)Co.,Ltd.,Xiamen 361021,China)

机构地区：[1]华侨大学土木工程学院,厦门361021 [2]厦门工学院建筑科学与土木工程学院,厦门361021 [3]华大工程科技(厦门)有限公司,厦门361021

出　　处：《科学技术与工程》2025年第8期3349-3358,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52178484);福建省中青年教师教育科研项目(JAT210570);福建省自然科学基金(2023J01107)。

摘　　要：针对常见界面抗剪性能测试的试件形式存在不能有效反映界面上切应力的实际情况,提出对传统Z形试件的优化改进方案。采用优化改进的Z形试件,开展超高性能混凝土(ultra-high performance concrete,UHPC)与普通混凝土(normal concrete,NC)界面处抗剪强度的试验研究,考察抗剪钢筋配筋率和界面粗糙度对界面抗剪强度的影响程度。结果表明:界面受剪时的破坏面发生在NC侧或者部分界面与部分NC侧,为典型的脆性破坏特征;界面的抗剪强度随着粗糙度的增大而增大,但当粗糙度大于1.8时,增大界面粗糙度来提高界面抗剪强度的效果不太明显;带肋钢筋作为抗剪钢筋能充分发挥钢筋的销栓作用,比光圆钢筋提高界面抗剪强度的效果有显著提高。建立能考虑抗剪钢筋和界面粗糙度贡献的UHPC和NC界面抗剪承载力计算公式,其理论计算值和试验结果吻合良好,能够为具有UHPC和NC界面的叠合构件在进行工程设计时提供参考。In response to the common forms of specimens used for interface shear performance testing,these specimens fail to effectively reflect the actual situation of shear stress on the interface.An optimized improvement scheme for the traditional Z-type specimen was proposed.By employing the optimized Z-type specimen,experimental studies on the shear strength at the interface between ultra-high performance concrete(UHPC)and normal concrete(NC)were conducted,examining the influence of shear reinforcement ratio and interface roughness on the interface shear strength.The research results indicate that the failure occurs on the NC side or partially on the interface and partially on the NC side,which is characteristic of typical brittle failure.The shear strength of the interface increases with the increase of roughness,but when the roughness is larger than the value of 1.8,the effect of increasing interface roughness to enhance the interface shear strength is not very significant.Ribbed reinforcement as shear reinforcement can fully exert the anchoring effect and the effect of improving the interface shear strength is more evident than that of smooth-round reinforcement.A calculation formula for the interface shear capacity of UHPC and NC,which can consider the contribution of shear reinforcement and interface roughness,has been established.The theoretical calculation values are in good agreement with the experimental results,which can provide reference for the engineering design of composite components with UHPC and NC interfaces.

关 键 词：超高性能混凝土(UHPC)-普通混凝土(NC)界面 优化Z形试件 界面抗剪性能 粗糙度 抗剪钢筋 

分 类 号：TU375[建筑科学—结构工程]