FRC预制连梁梁端埋入长度计算方法研究  

Calculation Method Research for Length of End Portion Buried in Pier of FRC Precast Coupling Beams

作　　者：车佳玲[1] 马彩霞[1] 梁兴文[2] 童岳生[2] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑科学》2015年第11期29-33,67,共6页Building Science

基　　金：国家自然科学基金资助项目(51408328;51278402);宁夏自然科学基金(NZ14041);宁夏十二五科技支撑项目(2012ZYS264)

摘　　要：纤维增强混凝土(FRC)具有受拉应变-硬化和多细微裂缝开展特性,替代普通混凝土作为连梁基体可减少连梁箍筋数量,增大连梁的受剪承载力、变形能力和损伤容限。根据FRC预制连梁屈服时连梁梁端埋入墙肢部分形成的力与约束弯矩平衡条件,提出预制连梁梁端埋入墙肢长度计算方法。连梁梁端埋入长度的大小主要取决于剪压比、跨高比和连梁截面高度的大小。将理论计算结果与试验结果和数值模拟进行比较,结果表明,建议的埋入长度计算公式较为合理,可作为FRC连梁梁端埋入长度设计的参考依据。The fiber reinforced concrete （FRC） has a high tensile strain-hardening behavior and numerous micro- cracks development. The use of FRC in diagonally coupling beams can reduce the amounts of stirrups and enhance its shear strength, deformability and damage tolerance. Based on the force and restraining moment equilibrium conditions of end portion buried in pier when FRC precast beams yield, the length calculation method of end portion buried in pier is proposed. The length of the end portion buried in pier depends on shear-compression ratio, span- depth ratio and sectional height of cupling beams. The model is compared with specimens and numerical simulation that are experimentally tested by several investigators, and the result shows good agreement with the experimental behavior of FRC coupling beams.

关 键 词：连梁 纤维增强混凝土 预制 梁端埋入深度 计算方法 

分 类 号：TU756.42[建筑科学—建筑技术科学]