玄武岩筋无机聚合物混凝土梁抗剪性能试验研究
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摘要
玄武岩筋和无机聚合物混凝土都具有良好的耐久性能。通过玄武岩筋无机聚合物混凝土有腹筋梁的抗剪性能试验,获得了梁的破坏形态和裂缝开展情况;研究了试验梁荷载与挠度的关系;探讨了配箍率与剪跨比对其抗剪承载力的影响。结果表明:在剪跨比为1.5、2.0、2.5时,BFRP筋无机聚合物混凝土梁均发生剪压破坏;剪跨比λ=2.0、2.5的试验梁相比λ=1.5的试验梁开裂荷载分别降低10%、20%,极限荷载分别降低3.9%、29.4%;箍筋间距S=100、150 mm的试验梁相比S=80 mm的试验梁极限荷载分别降低6.6%、15.1%;混凝土梁开裂前,挠度增长缓慢,开裂后增长较快,表现为荷载-挠度曲线呈折线变化。
Both basalt fiber reinforced plastic tendons(BFRP tendons)and inorganic polymer concrete have good durability.It carried out the experimental study on the shear resistance of BFRP tendon reinforced inorganic polymer concrete beams.The damage morphology and fracture development of BFRP tendon inorganic polymer concrete beams were observed.The relationship between load and deflection of the test beam was studied.The stirrup ratio and shear span ratio on the influence of shear bearing capacity was discussed.The results show that when the shear span ratio is 1.5,2.0,2.5,both shear-pressure failure of BFRP tendon inorganic polymer concrete beams occurs.The test beam with shear span ratio of λ=2.0 and 2.5 has lower cracking load of 10% and 20% than the test beam of λ=1.5 and the ultimate load decreases by 3.9% and 29.4% respectively.The limit load of the test beam with the spacing S=100 mm and 150 mm was reduced by 6.6% and 15.1%,respectively,compared with the test beam with S=80 mm.Before the cracking of concrete beams,the deflection increases slowly,and then increases rapidly after cracking,which shows that the load-deflection curve changes in a broken line.
Both basalt fiber reinforced plastic tendons(BFRP tendons)and inorganic polymer concrete have good durability.It carried out the experimental study on the shear resistance of BFRP tendon reinforced inorganic polymer concrete beams.The damage morphology and fracture development of BFRP tendon inorganic polymer concrete beams were observed.The relationship between load and deflection of the test beam was studied.The stirrup ratio and shear span ratio on the influence of shear bearing capacity was discussed.The results show that when the shear span ratio is 1.5,2.0,2.5,both shear-pressure failure of BFRP tendon inorganic polymer concrete beams occurs.The test beam with shear span ratio of λ=2.0 and 2.5 has lower cracking load of 10% and 20% than the test beam of λ=1.5 and the ultimate load decreases by 3.9% and 29.4% respectively.The limit load of the test beam with the spacing S=100 mm and 150 mm was reduced by 6.6% and 15.1%,respectively,compared with the test beam with S=80 mm.Before the cracking of concrete beams,the deflection increases slowly,and then increases rapidly after cracking,which shows that the load-deflection curve changes in a broken line.
引文
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[15]范小春,刘东,颜岩,等.无机聚合物混凝土路面板不同龄期抗压性能试验研究[J].混凝土,2012(4):69-71.
[2]OVITIGALA T.Structural behavior of concrete beams reinforced with basalt fiber reinforced polymer(BFRP)bars[D].University of Illinois at Chicago,2012.
[3]ISSA M A,OVITIGALA T,IBRAHIM M.Shear behavior of basalt fiber reinforced concrete beams with and without basalt FRP stirrups[J].Journal of Composites for Construction,2015,20(4):83-93.
[4]毕巧巍.玄武岩纤维混凝土的微结构及BFRP筋纤维混凝土梁斜截面承载力试验研究[D].大连:大连理工大学,2012.
[5]李炳宏,江世永,飞渭.玄武岩纤维增强塑料筋混凝土梁受弯破坏形态有限元分析[J].中国塑料,2010,24(4):70-75.
[6]李炳宏,江世永,飞渭,等.玄武岩纤维增强塑料筋混凝土梁受弯性能研究[J].中国塑料,2009,23(7):69-72.
[7]孙朋永,江世永,飞渭,等.新型BFRP筋增强混凝土受弯构件挠度控制[J].后勤工程学院学报,2009,25(2):18-22,68.
[8]SOFI M,VAN DEVENTER J S J,MENDIS P A,et al.Engineering properties of inorganic polymer concretes(IPCs)[J].Cement and Concrete Research,2007,37(2):251-257.
[9]SARKER P K.Analysis of geopolymer concrete columns[J].Materials and structures,2009,42(6):715-724.
[10]SOFI M,VAN DEVENTER J S J,MENDIS P A,et al.Bond performance of reinforcing bars in inorganic polymer concrete(IPC)[J].Journal of Materials Science,2007,42(9):3107-3116.
[11]LAVANYA G,JEGAN J.Durability study on high calcium fly ash based geopolymer concrete[J].Advances in Materials Science&Engineering,2015(6):1-7.
[12]CHANG E H.Shear and bond behaviour of reinforced fly ashbased geopolymer concrete beams[D].Curtin University of Technology at Australia,2009.
[13]金鑫.无机聚合物混凝土基本力学性能及应用研究[D].武汉:武汉理工大学,2013.
[14]卢哲安,卢方志,朱乃龙,等.无机聚合物混凝土疲劳性能试验研究[J].混凝土,2011(7):1-3,6.
[15]范小春,刘东,颜岩,等.无机聚合物混凝土路面板不同龄期抗压性能试验研究[J].混凝土,2012(4):69-71.
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