混合配筋预应力混凝土管桩抗弯承载性能研究
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摘要
通过开展6根混合配筋预应力混凝土管桩和3根预应力混凝土管桩的抗弯性能试验,分析非预应力钢筋的配置对混合配筋预应力混凝土管桩抗弯承载性能的影响。试验结果表明:配置非预应力钢筋可明显提高预应力混凝土管桩的抗弯承载力,对控制抗弯裂缝的开展有明显的效果。与试验数据相比,现有抗弯承载力公式的计算值合理有效,但公式形式较为复杂。针对混合配筋预应力混凝土管桩的抗弯承载力进行研究,将环形截面等效成工字形截面,并利用"等效钢带法"计算钢筋提供的轴力和弯矩,推导出了简化计算公式,其计算结果相对试验承载力具有合理的富余。相比原有公式,简化计算公式形式简单、易于计算,可应用于实际预应力混凝土管桩的设计分析中。
Flexural tests on six prestressed concrete pipe piles with hybrid reinforcement(PRC pipe pile) and three prestressed high-strength concrete(PHC) pipe piles were carried out in this study. The effects of non-prestressed reinforcement on the flexural behavior of PRC pipe pile were investigated. It was revealed that the introduction of non-prestressed steel bars could significantly increase the flexural capacity and was remarkably beneficial to controlling the propagation of flexural cracks. Compared to the test data, the calculated values from the existing formulas of flexural capacity, which are generally complicated, are reasonable and valid. To determine the flexural capacity of PRC pipe piles, the annular cross section was converted equivalently to I-shaped section, and the equivalent steel strip method was used to calculate the axial force and bending moment of the steel bar. Furthermore, a simplified formula for calculating flexural capacity of both PHC and PRC pipe piles was developed, and the calculated results based on the formula lead to reasonable agreements with the test results. Compared to the existing design formulas, the simplified formula is simple and convenient in calculation, and hence, it can be applied to the design of PHC and PRC pipe piles.
Flexural tests on six prestressed concrete pipe piles with hybrid reinforcement(PRC pipe pile) and three prestressed high-strength concrete(PHC) pipe piles were carried out in this study. The effects of non-prestressed reinforcement on the flexural behavior of PRC pipe pile were investigated. It was revealed that the introduction of non-prestressed steel bars could significantly increase the flexural capacity and was remarkably beneficial to controlling the propagation of flexural cracks. Compared to the test data, the calculated values from the existing formulas of flexural capacity, which are generally complicated, are reasonable and valid. To determine the flexural capacity of PRC pipe piles, the annular cross section was converted equivalently to I-shaped section, and the equivalent steel strip method was used to calculate the axial force and bending moment of the steel bar. Furthermore, a simplified formula for calculating flexural capacity of both PHC and PRC pipe piles was developed, and the calculated results based on the formula lead to reasonable agreements with the test results. Compared to the existing design formulas, the simplified formula is simple and convenient in calculation, and hence, it can be applied to the design of PHC and PRC pipe piles.
引文
[1]刘俊伟,张忠苗,于秀霞,等.预应力混凝土管桩抗弯及抗剪性能试验研究[J].建筑技术,2010,41(12):1101-1104(LiuJunwei,ZhangZhongmiao,YuXiuxia,etal.Experimentalstudyonflexuralandshearing propertiesofprestressedconcretepipepile[J].ArchitectureTechnology,2010,41(12):1101-1104(in Chinese))
[2]郑刚,张天奇,李庆钢,等.考虑剪跨比及截桩填芯影响的PHC管桩抗剪承载力试验研究[J].土木工程学报, 2014, 47(7):97-109(Zheng Gang, Zhang Tianqi,Li Qinggang, et al. Experimental study on shear capacity forPHCpipepilesconsideringinfluenceofshear span-effectivedepthratioandreinforcedconcretecore[J].ChinaCivilEngineeringJournal,2014,47(7):97-109(in Chinese))
[3]AkiyamaM,AbeS,AokiN,etal.Flexuraltestof precasthigh-strengthreinforcedconcretepile prestressed with unbonded bars arranged at the center of thecross-section[J].EngineeringStructures,2012,34(1):259-270
[4]WuZhipeng,YangXuedong,BaoLei.Application researchofprestressedhighstrengthconcretepipepile inconstruction[J].AppliedMechanics&Materials,2012, 193-194:1393-1396
[5]Carbonell-MárquezJF,Gil-MartínLM,Fernández-RuízMA,etal.Effectiveareaintension stiffeningofreinforcedconcretepilessubjectedto flexureaccordingtoEurocode2[J].Engineering Structures, 2014, 76:62-74
[6]李镜培,刘毅,周韵鸿.海工环境中PHC管桩水平承载寿命预测[J].土木工程学报,2013,46(12):109-117(LiJingpei,LiuYi,ZhouYunhong.Servicelife predictionofhorizontalbearingcapacityofPHCpipe pile in marine environment[J]. China Civil Engineering Journal, 2013, 46(12):109-117(in Chinese))
[7]ShiraishiI,HayashiS,KuwabaraF,etal.Astudyon failuremechanismandultimatestrengthoflarge diameter PHC pile[J]. Concrete Research&Technology,1997, 8(1):85-93
[8]赵升峰,黄广龙,马世强,等.预制混凝土支护管桩在深基坑工程中的应用[J].岩土工程学报,2014,36(S1):91-96(ZhaoShengfeng,HuangGuanglong,Ma Shiqiang,etal.Applicationofprecastconcretepipe piles in a deep excavation project[J]. Chinese Journal of GeotechnicalEngineering,2014,36(S1):91-96(in Chinese))
[9]LiuHanlong,KongGangqiang,DingXuanming,etal.Performancesoflarge-diametercast-in-placeconcrete pipe piles and pile groups under lateral loads[J]. Journal ofPerformanceofConstructedFacilities,2013,27(2):191-202
[10]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(YaoDali, Jia Jinqing, Yu Fang.Experimentalstudyoftheshearcapacityofprestressed ultra-highreinforcedconcretebeamswithstirrups[J].JournalofHunanUniversity:NaturalSciences,2015,42(3):23-30(in Chinese))
[11]王铁成,杨志坚,赵海龙,等. PHC管桩与承台连接节点试验研究与有限元分析[J].天津大学学报:自然科学与工程技术版, 2015, 48(6):527-534(Wang Tiecheng,YangZhijian,ZhaoHailong,etal.Experimental investigationandfiniteelementanalysisofprestressed highstrengthconcretepipe-pilecapconnections[J].JournalofTianjinUniversity:ScienceandTechnology,2015, 48(6):527-534(in Chinese))
[12]唐昌辉,易伟建,沈蒲生.无粘结筋对构件抗弯刚度的贡献分析与研究[J].湖南大学学报:自然科学版,2001,28(5):75-79(TangChanghui,YiWeijian,Shen Pusheng. The contribution to the flexural stiffness of the unboundedtendonsinprestressedconcretebeams[J].JournalofHunanUniversity:NaturalSciences,2001,28(5):75-79(in Chinese))
[13]王铁成,杜宙芳,赵海龙,等.混合配筋管桩的抗震性能试验研究[J].土木工程与管理学报,2015,32(3):27-32(WangTiecheng,DuZhoufang,ZhaoHailong,et al.Experimentalresearchonaseismicbehaviorofpipe pileswithhybridreinforcement[J].JournalofCivil EngineeringandManagement,2015,32(3):27-32(in Chinese))
[14]王新玲,高会宗,周同和,等.新型混合配筋预应力混凝土管桩抗弯性能试验研究[J].工业建筑,2012,42(8):64-68(WangXinling,GaoHuizong,Zhou Tonghe, et al. Experimental studies of flexural behavior ofnewtypeprestressedconcretepipepilewith compoundunperstressedreinforcement[J].Industrial Construction, 2012, 42(8):64-68(in Chinese))
[15]张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪性能试验研究[J].岩土工程学报,2011,33(S2):271-277(Zhang Zhongmiao, Liu Junwei, Xie Zhizhuan,etal.Experimentalstudyonflexuralandshearing propertiesofmodifiedconcretepipepiles[J].Chinese JournalofGeotechnicalEngineering,2011,33(S2):271-277(in Chinese))
[16]方志,彭力军.钢筋混凝土圆形截面偏压构件强度计算的等效钢带法[J].中南公路工程, 1993(1):52-56
[17]DBJT20—60混合配筋预应力混凝土管桩[S].四川:四川省建筑标准设计办公室, 2013:5-12
[18]方志.钢筋混凝土圆形截面偏压构件正截面承载力的简捷分析[J].建筑结构, 1993(9):26-28
[19]方志.钢筋混凝土圆形截面偏压构件的正截面强度与变形[J].中国公路学报,1994,7(1):52-58(FangZhi.StrengthanddeformationofR.C.eccentrically compressivememberswithcircularsection[J].Chinese JournalofHighwayEngineering,1994,7(1):52-58(in Chinese))
[2]郑刚,张天奇,李庆钢,等.考虑剪跨比及截桩填芯影响的PHC管桩抗剪承载力试验研究[J].土木工程学报, 2014, 47(7):97-109(Zheng Gang, Zhang Tianqi,Li Qinggang, et al. Experimental study on shear capacity forPHCpipepilesconsideringinfluenceofshear span-effectivedepthratioandreinforcedconcretecore[J].ChinaCivilEngineeringJournal,2014,47(7):97-109(in Chinese))
[3]AkiyamaM,AbeS,AokiN,etal.Flexuraltestof precasthigh-strengthreinforcedconcretepile prestressed with unbonded bars arranged at the center of thecross-section[J].EngineeringStructures,2012,34(1):259-270
[4]WuZhipeng,YangXuedong,BaoLei.Application researchofprestressedhighstrengthconcretepipepile inconstruction[J].AppliedMechanics&Materials,2012, 193-194:1393-1396
[5]Carbonell-MárquezJF,Gil-MartínLM,Fernández-RuízMA,etal.Effectiveareaintension stiffeningofreinforcedconcretepilessubjectedto flexureaccordingtoEurocode2[J].Engineering Structures, 2014, 76:62-74
[6]李镜培,刘毅,周韵鸿.海工环境中PHC管桩水平承载寿命预测[J].土木工程学报,2013,46(12):109-117(LiJingpei,LiuYi,ZhouYunhong.Servicelife predictionofhorizontalbearingcapacityofPHCpipe pile in marine environment[J]. China Civil Engineering Journal, 2013, 46(12):109-117(in Chinese))
[7]ShiraishiI,HayashiS,KuwabaraF,etal.Astudyon failuremechanismandultimatestrengthoflarge diameter PHC pile[J]. Concrete Research&Technology,1997, 8(1):85-93
[8]赵升峰,黄广龙,马世强,等.预制混凝土支护管桩在深基坑工程中的应用[J].岩土工程学报,2014,36(S1):91-96(ZhaoShengfeng,HuangGuanglong,Ma Shiqiang,etal.Applicationofprecastconcretepipe piles in a deep excavation project[J]. Chinese Journal of GeotechnicalEngineering,2014,36(S1):91-96(in Chinese))
[9]LiuHanlong,KongGangqiang,DingXuanming,etal.Performancesoflarge-diametercast-in-placeconcrete pipe piles and pile groups under lateral loads[J]. Journal ofPerformanceofConstructedFacilities,2013,27(2):191-202
[10]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(YaoDali, Jia Jinqing, Yu Fang.Experimentalstudyoftheshearcapacityofprestressed ultra-highreinforcedconcretebeamswithstirrups[J].JournalofHunanUniversity:NaturalSciences,2015,42(3):23-30(in Chinese))
[11]王铁成,杨志坚,赵海龙,等. PHC管桩与承台连接节点试验研究与有限元分析[J].天津大学学报:自然科学与工程技术版, 2015, 48(6):527-534(Wang Tiecheng,YangZhijian,ZhaoHailong,etal.Experimental investigationandfiniteelementanalysisofprestressed highstrengthconcretepipe-pilecapconnections[J].JournalofTianjinUniversity:ScienceandTechnology,2015, 48(6):527-534(in Chinese))
[12]唐昌辉,易伟建,沈蒲生.无粘结筋对构件抗弯刚度的贡献分析与研究[J].湖南大学学报:自然科学版,2001,28(5):75-79(TangChanghui,YiWeijian,Shen Pusheng. The contribution to the flexural stiffness of the unboundedtendonsinprestressedconcretebeams[J].JournalofHunanUniversity:NaturalSciences,2001,28(5):75-79(in Chinese))
[13]王铁成,杜宙芳,赵海龙,等.混合配筋管桩的抗震性能试验研究[J].土木工程与管理学报,2015,32(3):27-32(WangTiecheng,DuZhoufang,ZhaoHailong,et al.Experimentalresearchonaseismicbehaviorofpipe pileswithhybridreinforcement[J].JournalofCivil EngineeringandManagement,2015,32(3):27-32(in Chinese))
[14]王新玲,高会宗,周同和,等.新型混合配筋预应力混凝土管桩抗弯性能试验研究[J].工业建筑,2012,42(8):64-68(WangXinling,GaoHuizong,Zhou Tonghe, et al. Experimental studies of flexural behavior ofnewtypeprestressedconcretepipepilewith compoundunperstressedreinforcement[J].Industrial Construction, 2012, 42(8):64-68(in Chinese))
[15]张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪性能试验研究[J].岩土工程学报,2011,33(S2):271-277(Zhang Zhongmiao, Liu Junwei, Xie Zhizhuan,etal.Experimentalstudyonflexuralandshearing propertiesofmodifiedconcretepipepiles[J].Chinese JournalofGeotechnicalEngineering,2011,33(S2):271-277(in Chinese))
[16]方志,彭力军.钢筋混凝土圆形截面偏压构件强度计算的等效钢带法[J].中南公路工程, 1993(1):52-56
[17]DBJT20—60混合配筋预应力混凝土管桩[S].四川:四川省建筑标准设计办公室, 2013:5-12
[18]方志.钢筋混凝土圆形截面偏压构件正截面承载力的简捷分析[J].建筑结构, 1993(9):26-28
[19]方志.钢筋混凝土圆形截面偏压构件的正截面强度与变形[J].中国公路学报,1994,7(1):52-58(FangZhi.StrengthanddeformationofR.C.eccentrically compressivememberswithcircularsection[J].Chinese JournalofHighwayEngineering,1994,7(1):52-58(in Chinese))