配置竖向预应力筋混凝土箱梁抗剪性能试验
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摘要
通过对2组配置竖向预应力筋的钢筋混凝土箱梁进行受剪试验,研究了竖向预应力筋张拉与不张拉,预应力孔道灌浆与不灌浆对混凝土箱梁抗剪性能的影响,对比分析了不同参数下试验梁的破坏形态、裂缝行为、荷载-挠度关系、开裂荷载、抗剪承载能力、腹板应变以及竖向预应力筋应变等的发展规律.结果表明:对于本文试验梁,竖向预应力可将开裂荷载提高16%,竖向预应力筋张拉端的抗剪承载力比不张拉端增加2.3%,不灌浆端的抗剪承载力比灌浆端减小9.3%.由此说明,适当地施加竖向预应力可以较好地提高腹板开裂荷载,并对抗剪承载力有积极贡献,但如果灌浆不饱满则会对抗剪承载力产生很大折减.
This study investigated the shear behavior of two reinforced thin-wall box girders with vertical prestressed tendon.Whether the vertical tendons were prestressed or not and the ducts were grouted or not were comparatively studied.The experimental study addressed diagonal cracking behaviors,crack patterns and width,load-deflection relationship,the web strain and stirrup strain,as well as ultimate shear capacity.The test results have shown that,the cracking load of box girder with prestressing force is about 16% higher than those without,and the effect of prestressing force only increases by about 2.3% for ultimate shear capacity.Meanwhile,the shear resistance of girder without grouting is about 9.3% lower than those with ducts well grouted.Through the comparison of test girders,it has been found that the vertical prestressing force can improve the diagonal cracking load and shear capacity.The grouting quality for vertical prestressed ducts is of great importance to the shear behavior of the box girder.
This study investigated the shear behavior of two reinforced thin-wall box girders with vertical prestressed tendon.Whether the vertical tendons were prestressed or not and the ducts were grouted or not were comparatively studied.The experimental study addressed diagonal cracking behaviors,crack patterns and width,load-deflection relationship,the web strain and stirrup strain,as well as ultimate shear capacity.The test results have shown that,the cracking load of box girder with prestressing force is about 16% higher than those without,and the effect of prestressing force only increases by about 2.3% for ultimate shear capacity.Meanwhile,the shear resistance of girder without grouting is about 9.3% lower than those with ducts well grouted.Through the comparison of test girders,it has been found that the vertical prestressing force can improve the diagonal cracking load and shear capacity.The grouting quality for vertical prestressed ducts is of great importance to the shear behavior of the box girder.
引文
[1]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):31-36.ZHOU Jun-sheng,LOU Zhuang-hong.The status quo and de-veloping trends of large span prestressed concrete bridges withcontinuous rigid frame structure[J].China Journal of High-way and Transport,2000,13(1):31-36.(In Chinese)
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[5]曹敏辉.竖向预应力对混凝土箱梁抗剪性能影响的研究[D].长沙:湖南大学土木工程学院,2010:1-72.CAO Min-hui.Study on shear properties of reinforced thin-wallbox girders under vertical prestressed[D].Changsha:Collegeof Civil Engineering,Hunan University,2010:1-72.(InChinese)
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[7]JTG D62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004:28-30.JTG D62—2004 Code for design of highway reinforced con-crete and prestressed concrete bridges and culverts[S].Bei-jing:China Communications Press,2004:28-30.(In Chi-nese)
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[10]过镇海,时旭东.钢筋混凝土原理与分析[M].北京:清华大学出版社,2003:14.GUO Zhen-hai,SHI Xu-dong.Reinforced concrete theory andanalyse[M].Beijing:Tsinghua University Press,2003:14.(InChinese)
[2]ABOUTAHA S R,BURNS H N.Strengthening of prestressedconcrete composite beams using external prestressed stirrups[J].PCI Joumal,1994(4):64-72.
[3]吴波,刘灿,徐凯燕,等.横向预应力混凝土梁的抗剪性能试验研究[J].地震工程与工程振动,2007,27(2):58-62.WU Bo,LIU Can,XU Kai-yan,et al.Experimental researchon shear capacity of transversely prestressed concrete beams[J].Earthquake Engineering and Engineering Vibration,2007,27(2):58-62.(In Chinese)
[4]钟新谷,沈明燕,尹旭文,等.预应力混凝土箱梁桥竖向预应力孔道漏灌浆对腹板截面开裂影响的研究[J].土木工程学报,2008,41(10):60-65.ZHONG Xin-gu,SHEN Ming-yan,YIN Xu-wen,et al.Influ-ence of non-grouted vertical prestressed ducts on sectional webcracking of concrete box girder bridges[J].China Civil Engi-neering Journal,2008,41(10):60-65.(In Chinese)
[5]曹敏辉.竖向预应力对混凝土箱梁抗剪性能影响的研究[D].长沙:湖南大学土木工程学院,2010:1-72.CAO Min-hui.Study on shear properties of reinforced thin-wallbox girders under vertical prestressed[D].Changsha:Collegeof Civil Engineering,Hunan University,2010:1-72.(InChinese)
[6]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010:1-178.GB 50010—2010 Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010:1-178.(In Chinese)
[7]JTG D62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004:28-30.JTG D62—2004 Code for design of highway reinforced con-crete and prestressed concrete bridges and culverts[S].Bei-jing:China Communications Press,2004:28-30.(In Chi-nese)
[8]ACI 318-08 Building code requirements for reinforced con-crete[S].Farmington:American Concrete Institute HillsMich,2008:147-160.
[9]CSA A23.3-04 Design of concrete structures[S].Mississauga:Canadian Standards Association,2004:214.
[10]过镇海,时旭东.钢筋混凝土原理与分析[M].北京:清华大学出版社,2003:14.GUO Zhen-hai,SHI Xu-dong.Reinforced concrete theory andanalyse[M].Beijing:Tsinghua University Press,2003:14.(InChinese)
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