超高性能混凝土界面直剪性能试验研究

Experimental Study on the Interfacial Direct Shear Performance of Ultra-high Performance Concrete

在装配式结构中混凝土预制构件之间可靠的连接至关重要,不仅可保证梁柱之间的协同工作,还能有效提高结构的抗震性能和承载能力。为研究使用超高性能混凝土(UHPC)和高强钢筋搭接连接的节点的受剪性能,文中设计制作了2个Z形试件,主要考虑钢筋搭接长度对UHPC直剪性能的影响。结果表明,试件整个加载过程可分为弹性阶段、裂缝发展阶段和破坏滑移阶段。当钢筋的搭接长度由6d提升到8d时,试件的抗剪承载力提升了3.7%,同时也明显提高了抗剪钢筋与混凝土之间的黏结性能。为满足UHPC界面直剪性能要求,钢筋搭接长度建议取值8d。

The reliable connection between the prefabricated beam and column is one of the most important connection in the prefabricated concrete structure,which not only ensures the collaboration between beams,columns and beam-column joint,but can also effectively improve the seismic performance and bearing capacity of the prefabricated concrete structure.In order to study the shear performance of prefabricated component connection with ultra-high-performance concrete(UHPC) and high-strength steel bars,two Z-shaped test parts with the effect of reinforcement lapping length were designed and analyzed.The experimental results show that the entire loading process of the test parts can be roughly divided into three stages:elastic phase,crack development stage,and destructive slip.When the reinforcement lapping length is increased from 6d to 8d,the shear carrier capacity of the test parts increases increased 3.7%,and the shear reinforcement and concrete adhesion performance can be also enhanced.In addition,the reinforcement lapping of 8d is recommended to use in the UHPC shear connection.