非对称集中荷载下无腹筋RC梁受剪性能试验研究  

Experimental Study on Shear Behavior of RC Beam without Web Reinforcement under Asymmetric Concentrated Load

作　　者：袁健[1] 刘家栋 段绍伟[1] YUAN Jian;LIU Jiadong;DUAN Shaowei(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004

出　　处：《湖南大学学报（自然科学版）》2024年第3期141-148,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52178183)。

摘　　要：非对称集中荷载作用下钢筋混凝土无腹筋简支梁具有两个不同的剪跨比,而两剪跨段受剪承载力与剪力作用之间的相对大小存在不确定性.通过开展6根非对称和4根对称集中荷载作用下钢筋混凝土无腹筋简支梁受剪性能试验研究,获取了破坏形态、荷载-跨中位移曲线和纵向受拉钢筋应变,并分析了《混凝土结构设计规范》(GB 50010—2010)公式、修正压力场理论、基于截面应变分析的抗剪模型和Zsutty统计公式的适用性.结果表明,对于小剪跨比恒为1.0的无腹筋简支梁,大剪跨比为2.0~4.0的梁均在大剪跨段发生剪切破坏;当大剪跨比由3.0增大至3.5时,梁的极限承载力出现由大剪跨段控制转变为小剪跨段控制的现象《.混凝土结构设计规范》(GB50010—2010)预测非对称集中荷载作用下钢筋混凝土无腹筋简支梁发生剪切破坏的位置与试验结果相反,而Zsutty统计公式的预测效果最好.Simply supported reinforced concrete(RC)beams without web reinforcement under asymmetric concentrated load have two different shear span-depth ratios,while the relationship between the shear capacity and the shear action of each shear span is uncertain.An experimental study on the shear behavior of 6 simply supported RC beams without web reinforcement under asymmetric concentrated load and 4 specimens subjected to symmetric concentrated load was carried out.The failure patterns,load-midspan displacement curves and the strains of longitudinal tensile reinforcement were obtained.Moreover,the applicability of the corresponding formula in the Chinese code for design of concrete structures(GB 50010—2010),the modified compression field theory,the strain-based shear strength model and Zsutty’s formula were analyzed.The results indicate that when the small shear span-depth ratio of simply supported RC beams without web reinforcement is always 1.0 and the large shear span-depth ratios are from 2.0 to 4.0,the shear failure occurs in the larger shear span.When the larger shear spandepth ratio increases from 3.0 to 3.5,the ultimate load capacity of the beam is controlled by the smaller shear span changed from being controlled by the larger shear span.The locations of shear failure in simply supported RC beams without web reinforcement under asymmetric concentrated load predicted by GB 50010—2010 are opposite to the experimental results,while Zsutty’s formula provides a less biased prediction.

关 键 词：非对称荷载 钢筋混凝土 无腹筋梁 受剪性能 静力试验 

分 类 号：TU375[建筑科学—结构工程]