钢筋超高性能混凝土梁抗剪性能试验研究
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摘要
对11根钢筋超高性能混凝土梁在两点对称加载作用下进行抗剪性能试验,试验参数为钢纤维掺量、剪跨比、纵筋配筋率、配箍率等.试验结果表明,4个参数中钢纤维掺量对梁的抗剪承载力影响最大,其次为剪跨比和纵筋率,配箍率影响最小;钢纤维掺量的增加显著提高了梁的抗剪承载力与抗变形能力,影响梁的破坏形态.根据试验结果与收集到的UHPC梁受剪资料,对基于桁架-拱理论的UHPC梁抗剪计算公式进行了修正.
In order to study the shear behavior of ultra-high performance concrete( UHPC) beams,the shear tests of 11 UHPC specimens under two concentrated loads are carried out. The test parameters are steel fiber content,shear span ratio,longitudinal reinforcement ratio and stirrup ratio. The test results show that the fiber content has the largest influence on the shear capacity among the four parameters,followed by the shear span ratio and longitudinal reinforcement ratio,while the minimum one is the stirrup ratio. The increase of steel fiber content significantly improves the bearing capacity and influence on failure modes of the shear beam. According to the test results and the collected UHPC beam shear data,the shear strength prediction formula based on truss-arch theory is improved.
In order to study the shear behavior of ultra-high performance concrete( UHPC) beams,the shear tests of 11 UHPC specimens under two concentrated loads are carried out. The test parameters are steel fiber content,shear span ratio,longitudinal reinforcement ratio and stirrup ratio. The test results show that the fiber content has the largest influence on the shear capacity among the four parameters,followed by the shear span ratio and longitudinal reinforcement ratio,while the minimum one is the stirrup ratio. The increase of steel fiber content significantly improves the bearing capacity and influence on failure modes of the shear beam. According to the test results and the collected UHPC beam shear data,the shear strength prediction formula based on truss-arch theory is improved.
引文
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[4]张猛,金凌志.中等剪跨比高强钢筋活性粉末混凝土无腹筋梁抗剪性能试验研究[J].工业建筑,2016,46(11):69-73.
[5]邓宗才,王海忠.基于修正压力场理论的活性粉末混凝土梁抗剪承载力计算[J].河北工业大学学报,2014,43(6):22-25.
[6]马熙伦,陈宝春,杨艳,等.R-UHPC梁的抗剪承载力计算方法[J].交通运输工程学报,2017,17(5):16-26.
[7]罗伯光,檀荷瑛.基于桁架拱模型的活性粉末混凝土梁抗剪承载力研究[J].建筑科学,2016,32(57):1-7.
[8]金凌志,祁凯能.高强钢筋活性粉末混凝土简支梁受剪性能试验研究[J].武汉理工大学学报,2013,38(5):108-113.
[9]刑朋涛,梁兴文.基于桁架-拱模型的纤维增强混凝土梁受剪承载力分析[J].建筑结构,2015,45(10):56-60.
[2]杜任远,吴永银,黄卿维,等.体外预应力RPC箱梁受弯加载试验研究[J].福州大学学报(自然科学版),2014,42(4):615-621.
[3]季文玉,丁波.活性粉末混凝土T形梁抗剪试验研究[J].中国铁道科学,2011,32(5):32-42.
[4]张猛,金凌志.中等剪跨比高强钢筋活性粉末混凝土无腹筋梁抗剪性能试验研究[J].工业建筑,2016,46(11):69-73.
[5]邓宗才,王海忠.基于修正压力场理论的活性粉末混凝土梁抗剪承载力计算[J].河北工业大学学报,2014,43(6):22-25.
[6]马熙伦,陈宝春,杨艳,等.R-UHPC梁的抗剪承载力计算方法[J].交通运输工程学报,2017,17(5):16-26.
[7]罗伯光,檀荷瑛.基于桁架拱模型的活性粉末混凝土梁抗剪承载力研究[J].建筑科学,2016,32(57):1-7.
[8]金凌志,祁凯能.高强钢筋活性粉末混凝土简支梁受剪性能试验研究[J].武汉理工大学学报,2013,38(5):108-113.
[9]刑朋涛,梁兴文.基于桁架-拱模型的纤维增强混凝土梁受剪承载力分析[J].建筑结构,2015,45(10):56-60.