不同剪跨比高强钢筋超高性能混凝土梁抗剪性能研究  

EXPERIMENTAL RESEARCH ON SHEAR BEHAVIOR OF HIGH-STRENGTH STEEL BAR REINFORCED BEAMS WITH DIFFERENT SHEAR-SPAN RATIOS

作　　者：金凌志[1] 梁曦 张毅[1] 张猛 JIN Lingzhi;LIANG Xi;ZHANG Yi;ZHANG Meng(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China;Construction Logistics Department, Guilin University of Technology, Guilin 541004, China)

机构地区：[1]广西岩土力学与工程重点实验室、桂林理工大学,广西桂林541004 [2]桂林理工大学基建后勤处,广西桂林541004

出　　处：《工业建筑》2018年第3期57-62,共6页Industrial Construction

基　　金：国家自然科学基金项目(51368013);广西重点实验室项目(2015-A-02)

摘　　要：为了探究超高性能混凝土（UHPC）简支梁的抗剪性能,对3根有腹筋UHPC简支梁和3根无腹筋UHPC简支梁开展抗剪试验。根据梁的实测抗剪承载力,并基于桁架-拱模型修正高强钢筋UHPC梁的抗剪承载力计算式。结果表明：主拉应变在开裂荷载以前呈线性增长,达到开裂荷载后主拉应变激增,应变方向发生突变;在传统桁架-拱模型的基础上,考虑UHPC的软化效应、抗拉贡献及纵筋销栓作用,构建高强钢筋UHPC梁受剪承载力修正式,其计算值与试验值吻合较好。In order to explore the shear behavior of ultra-high performance concrete（ UHPC） simply supported beam,three UHPC simply supported beams with stirrups and three beams without stirrup were tested. The values,directions of principal strain and relation curves of load-oblique crack inclination were obtained by experiment. Based on the improved truss arch model,a revised formula for the shear bearing capacity of UHPC beam with high-strength steel bars was presented. The results showed that the main tensile strain increased linearly before cracking,but the main tensile strain increased sharply and the strain direction mutated after cracking. On the basis of the traditional truss arch model,considering the softening effect of UHPC,tensile contribution of UHPC and longitudinal pin bolt action,the revised formula for the shear bearing capacity of the high-strength reinforced UHPC beam was established,and the calculated values were similar to that by experiment.

关 键 词：剪跨比 桁架-拱模型 超高性能混凝土梁 抗剪 承载力公式 

分 类 号：TU375[建筑科学—结构工程]