水平腹筋对RPC简支梁抗剪性能的影响  

Effect of horizontal abdominal tendons on the shear resistance of RPC simple supported beams

作　　者：金凌志[1] 梁曦 温晴 张毅[1] JIN Ling-zhi;LIANG Xi;WEN Qing;ZHANG Yi(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;Xingjia Real Estate Development Co.,Ltd. of Liuzhou,Liuzhou 545000,China;China Gezhouba Groups Electric Power Co. Ltd.,Wuhan 430034,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]柳州市兴佳房地产开发有限责任公司,广西柳州545000 [3]中国葛洲坝集团电力有限责任公司,武汉430034

出　　处：《桂林理工大学学报》2019年第1期94-102,共9页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51368013);广西岩土力学与工程重点实验室项目(2015-A-02)

摘　　要：通过3根配置水平腹筋高强钢筋RPC简支梁的剪切破坏试验,探究水平腹筋配筋率对试件的裂缝开展、挠度变化和抗剪承载力等的影响,并构建水平腹筋RPC简支梁抗剪承载力计算公式。研究结果表明:水平腹筋RPC简支梁在加载初期,无论是跨中截面还是剪跨区截面均基本符合平截面假定,但是斜裂缝开展后,剪跨区截面的应变平截面假定随即消失;水平腹筋类似纵筋的销栓作用,对试验梁的斜裂缝宽度和抗剪承载力均有一定影响,配筋根数和排数越多,试验梁的斜裂缝宽度越小,抗剪承载力越高;基于拉-压杆桁架模型,考虑活性粉末混凝土在拉-压复合应力状态下的软化现象,构建水平腹筋RPC简支梁抗剪承载力计算公式,其计算结果与试验值吻合较好。Through the shear test of 3 RPC beams with high strength steel bars, the influence of horizontal reinforcement ratio on the crack development, deflection and shear capacity of the specimens is investigated. A formula for calculating the shear capacity of RPC simply supported beams with horizontal reinforcement is established. The results show that when RPC beam with horizontal reinforcement in the early stage of loading, both middle section and cross section of shear span are basically consistent with the plane cross-section assumption;horizontal reinforcement has a definite effect on the diagonal crack width and the shear capacity. The more numbers of steel bar and numbers of row, the smaller the diagonal crack width of the test beam is, and the higher the shear bearing capacity. Based on the pull-compression truss model, considering the softening behavior of reactive powder concrete under tension compression combined stress, a formula for calculating the shear capacity of RPC simply supported beam with horizontal reinforcement is established. The calculated results match the experimental values.

关 键 词：水平腹筋 活性粉末混凝土梁 抗剪 拉-压杆桁架模型 承载力公式 

分 类 号：TU375.1[建筑科学—结构工程] TU317.1