不同剪跨比预应力活性粉末混凝土梁抗剪承载力分析
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摘要
为了研究预应力活性粉末混凝土简支梁的抗剪性能,对4根不同剪跨比无粘结后张预应力活性粉末混凝土梁展开抗剪试验研究,分析剪跨比对承载力的影响,并运用我国现行规范和塑性上限理论等公式对试验梁的承载力计算进行适用性验证.结果表明:随着剪跨比的增大,试验梁的破坏形态由斜压破坏向剪压破坏和斜拉破坏转化;试验梁的承载力随剪跨比的增大而减小,斜裂缝倾角也相应变小,预应力筋应力增量提升速率加快;在Voo塑性上限理论公式的基础上,考虑截面尺寸的影响,运用MATLAB对试验梁数据进行拟合,建立的预应力活性粉末混凝土梁抗剪承载力计算修正公式具有较好的实用性.
The influence of shear span ratio on bearing capacity of reactive powder concrete(RPC)beam was analyzed and applicability verification was carried out with national codes and plasticity upper-bound theory to investigate the shear capacity of four unbonded post-tensioned prestressed experimental simple beams with different shear span ratio.The results show that:with the increase of shear span ratio,the failure mode of the beam was transformed from diagonal compression failure to shear compression failure and diagonal tension failure;with the increase of the shear span ratio,the bearing capacity of the beam decreased,the inclined crack inclination decreases,and the stress increment of the prestressed tendon accelerates;on the basis of Voo plastic upper bound theory formula,considering the influence of section size,using MATLAB to fit the beam data,the practicability of revised shear capacity formula of prestressed reactive powder concrete beam is benign.
The influence of shear span ratio on bearing capacity of reactive powder concrete(RPC)beam was analyzed and applicability verification was carried out with national codes and plasticity upper-bound theory to investigate the shear capacity of four unbonded post-tensioned prestressed experimental simple beams with different shear span ratio.The results show that:with the increase of shear span ratio,the failure mode of the beam was transformed from diagonal compression failure to shear compression failure and diagonal tension failure;with the increase of the shear span ratio,the bearing capacity of the beam decreased,the inclined crack inclination decreases,and the stress increment of the prestressed tendon accelerates;on the basis of Voo plastic upper bound theory formula,considering the influence of section size,using MATLAB to fit the beam data,the practicability of revised shear capacity formula of prestressed reactive powder concrete beam is benign.
引文
[1]VOO Y L,FOSTER S J,GILBERT R I.Shear strength of fiber reinforced reactive powder concrete girders without stirrups[D].Sydney:University of New South Wales,2003.
[2]BRIAN F.FHWA gives superior marks to concrete bridge girder[J].Civil Engineering Magazine,2001,71(10):12-13.
[3]陈彬.预应力RPC梁抗剪性能研究[D].长沙:湖南大学,2007.
[4]王强,金凌志,曹霞,等.基于塑性理论的活性粉末混凝土梁抗剪承载力[J].同济大学学报(自然科学版),2017,45(1):16-22.DOI:10.11908/j.issn.0253-374x.2017.01.003.
[5]VOO Y L,FOSTER S J,GILBET R I.Shear strength of fiber reinforced reactive powder concrete prestressed girders without stirrups[J].Advanced Concrete Technology,2006,4(1):123-132.DOI:10.3151/jact.4.123.
[6]周英武,王苏岩,李宏男.钢筋混凝土梁斜裂缝倾角理论与试验分析[J].大连理工大学学报,2008,48(2):235-239.
[7]魏巍巍.基于修正压力场理论的钢筋混凝土结构受剪承载力及变性研究[D].大连:大连理工大学,2011.
[8]VOO Y L,POON W K,FOSTE S J.Shear strength of steel fiber-reinforeced ultrahigh-performance concrete beams without stirrups[J].Structural Engineering,2010,136(11):1393-1400.DOI:10.1061/(ASCE)ST.1943-541X.0000234.
[9]CANADIAN STANDARDS ASSOCIATION.Design of concrete structures:CAN/CSA A23.3-1994[S].Rexdale:Canadian Standards Association,1994.
[10]CANADIAN STANDARDS ASSOCIATION.Canadian highway bridge design code:CAN/CSA-S6-2000[S].Toronto:CSA International,2000.
[11]徐海宾,邓宗才.预应力超高性能钢纤维混凝土梁受弯性能试验研究[J].建筑结构学报,2014,35(12):58-64.DOI:10.14006/j.jzjgxb.2014.12.008.
[2]BRIAN F.FHWA gives superior marks to concrete bridge girder[J].Civil Engineering Magazine,2001,71(10):12-13.
[3]陈彬.预应力RPC梁抗剪性能研究[D].长沙:湖南大学,2007.
[4]王强,金凌志,曹霞,等.基于塑性理论的活性粉末混凝土梁抗剪承载力[J].同济大学学报(自然科学版),2017,45(1):16-22.DOI:10.11908/j.issn.0253-374x.2017.01.003.
[5]VOO Y L,FOSTER S J,GILBET R I.Shear strength of fiber reinforced reactive powder concrete prestressed girders without stirrups[J].Advanced Concrete Technology,2006,4(1):123-132.DOI:10.3151/jact.4.123.
[6]周英武,王苏岩,李宏男.钢筋混凝土梁斜裂缝倾角理论与试验分析[J].大连理工大学学报,2008,48(2):235-239.
[7]魏巍巍.基于修正压力场理论的钢筋混凝土结构受剪承载力及变性研究[D].大连:大连理工大学,2011.
[8]VOO Y L,POON W K,FOSTE S J.Shear strength of steel fiber-reinforeced ultrahigh-performance concrete beams without stirrups[J].Structural Engineering,2010,136(11):1393-1400.DOI:10.1061/(ASCE)ST.1943-541X.0000234.
[9]CANADIAN STANDARDS ASSOCIATION.Design of concrete structures:CAN/CSA A23.3-1994[S].Rexdale:Canadian Standards Association,1994.
[10]CANADIAN STANDARDS ASSOCIATION.Canadian highway bridge design code:CAN/CSA-S6-2000[S].Toronto:CSA International,2000.
[11]徐海宾,邓宗才.预应力超高性能钢纤维混凝土梁受弯性能试验研究[J].建筑结构学报,2014,35(12):58-64.DOI:10.14006/j.jzjgxb.2014.12.008.