不同预应力度RPC工字梁抗剪性能试验研究
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摘要
为研究不同预应力度RPC工字梁的抗剪性能,通过4根RPC工字梁的受剪试验,分析不同预应力度下试验梁的破坏形态、荷载—挠度以及荷载—预应力增量曲线的关系,研究不同预应力度对RPC工字梁的抗剪性能的影响。结果表明,预应力度从0增加到0.31、0.44和0.6,试验梁开裂荷载分别提高38.78%、58.86%和115.35%,抗剪承载力分别提高5.68%、13.11%和41.18%;预应力增量越大,梁破坏时的挠度越大;梁开裂前,预应力的增加使其刚度有所提升,但对开裂后梁的刚度影响甚微。最后通过对预应力RPC梁抗剪承载力的影响因素分析,提出RPC梁抗剪承载力建议公式,以为同类研究提供参考。
In order to study the shear performance of differently prestressed RPC beams,four RPC I-beams are subjected to shear tests,the failure shape,load deflection and load prestress increment curve of the beams under different prestress levels are analyzed,and the effect of different prestress levels on the shear properties of RPC I-beam is studied. The results show that when the prestress level is increased from 0 to 0. 31,0. 44 and 0. 6,the cracking load of the test beams is increased by38. 78%,58. 86% and 115. 35%, and the shear bearing capacity is increased by 5. 68%,13. 11% and 41. 18%,respectively. The higher the increment of prestress level,the larger the beam deflection when it is broken. And before beam cracking,increasing the prestress level enhances beam stiffness,but the prestress level has the minimal effect on beam stiffness after beam cracking. Based on the analysis of the influence factors of the shear bearing capacity of the prestressed RPC beam,the proposed formula for the shear bearing capacity of RPC beam can beapplied to similar research.
In order to study the shear performance of differently prestressed RPC beams,four RPC I-beams are subjected to shear tests,the failure shape,load deflection and load prestress increment curve of the beams under different prestress levels are analyzed,and the effect of different prestress levels on the shear properties of RPC I-beam is studied. The results show that when the prestress level is increased from 0 to 0. 31,0. 44 and 0. 6,the cracking load of the test beams is increased by38. 78%,58. 86% and 115. 35%, and the shear bearing capacity is increased by 5. 68%,13. 11% and 41. 18%,respectively. The higher the increment of prestress level,the larger the beam deflection when it is broken. And before beam cracking,increasing the prestress level enhances beam stiffness,but the prestress level has the minimal effect on beam stiffness after beam cracking. Based on the analysis of the influence factors of the shear bearing capacity of the prestressed RPC beam,the proposed formula for the shear bearing capacity of RPC beam can beapplied to similar research.
引文
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[18]覃荷瑛,杨玉兰,杨蕊,等.钢纤维体积掺率对无腹筋活性粉末混凝土简支梁抗剪性能的影响[J].工业建筑,2016,46(10):79-82.
[2]DUGAT J,ROUX N,BERNIER G.Mechanical properties of reactive power concrete[J].Materials and Structures,1996,29:233-240.
[3]ROUX B N,ANDRADEJ C,SANJUAN M A.Experimental study of durability of reactive powder concretes[J].Journal of Materials in Civil Engineering,1996,8(2):1-6.
[4]VOO Y L,FOSTER S J,GILBERT R I.Shear strength of fiber reinforced reactive powder concrete prestressed girders without stirrups[J].Journal of Advanced Concrete Technology,2006,4(1):123-132.
[5]陈彬.预应力RPC梁抗剪性能研究[D].长沙:湖南大学,2007.
[6]陈晓宝,赵国藩,文明秀.无粘结部分预应力混凝土梁抗剪强度的试验研究[J].合肥工业大学学报(自然科版),1992,15(S1):116-121.
[7]HEGGER J,BERTRAM G.Shear carrying capacity of steel fiber reinforced UHPC[C]//2nd international symposium on ultra high performance concrete.Kassel,Germany:Kassel University Press,2008:513-520.
[8]周志祥,江炳章.部分预应力混凝土简支梁斜截面抗裂性的试验研究[J].重庆交通学院学报,1988(3):9-17.
[9]GRAYBEA B.Characterization of the behavior of ultra-high performance concrete[D].Maryland:University of Maryland,2005.
[10]曹霞,唐婷,彭金成,等.纵筋率对高强钢筋RPC简支梁受剪性能的影响[J].广西大学学报(自然科学版),2015,40(4):831-837.
[11]中国土木工程学会高强于高性能混凝土委员会.高强混凝土结构技术规程:中国工程建设标准化协会标准CECS104:99[M].北京:中国计划出版社,1999.
[12]FOSTER S J,POON W,VOO Y L.Shear strength of steel fiber-reinforced ultra high-performance concrete beams without stirrups[J].Journal of Structure Engineering,2010,136(11):1393-1399.
[13]赵顺波,赵国藩,黄承逵.预应力钢纤维混凝土梁斜截面承载力试验和计算方法[J].土木工程学报,1999,32(2):28-33.
[14]姚大立,贾金青,余芳.有腹筋预应力超高强混凝土梁受剪承载力试验研究[J].湖南大学学报(自然科学版),2015,42(3):23-30.
[15]刘汉元.预应力高强混凝土简支梁抗剪强度的试验研究[C]//高强混凝土及其应用第二届学术讨论会论文集.北京:中国土木工程学会,1995.
[16]智菲,叶知满.预应力高强混凝土有腹筋T形截面梁抗剪承载力试验研究[J].工业建筑,2007,37(S1):321-324+413.
[17]何培.不同剪跨比HRB500钢筋RPC简支梁抗剪性能试验研究[D].桂林:桂林理工大学,2015.
[18]覃荷瑛,杨玉兰,杨蕊,等.钢纤维体积掺率对无腹筋活性粉末混凝土简支梁抗剪性能的影响[J].工业建筑,2016,46(10):79-82.