独柱式桥墩裂缝宽度计算方法及试验研究
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摘要
进行了7个缩尺的小剪跨比钢筋混凝土独柱双支承桥墩模型试验研究。分析探讨了现有中国规范在计算钢筋混凝土独柱墩结构受弯裂缝宽度问题的适用性,给出了用于受弯裂缝宽度计算的修正钢筋名义拉应力计算公式。结合试验数据及回归分析结果,考虑混凝土抗剪强度、钢筋销栓作用、裂缝间骨料咬合作用、弯起钢筋及箍筋的竖向力分力等对抗剪的贡献,推导了剪切斜裂缝的裂缝宽度计算公式。计算结果表明:采用修正钢筋名义拉应力的独柱墩受弯裂缝计算公式的预测值与试验数据基本吻合,提出的斜裂缝宽度计算公式的预测值与参与对比的试验结果也十分接近,证实了该方法的合理性。
The experimental research of seven small scaled RC single column pier models with small shear-span ratio was carried out.The comparison and discussion of applicabilities of different codes in calculating bending crack width of RC single column pier were presented.A modified formula for bending crack width calculation was developed by revising the nominal tensile stress computational formula.Considering the contribution of concrete shear strength,reinforce dowel action,aggregate biting force,and vertical components of the tensile force of bending-up steel bar and stirrup,to the shear,the calculation formula for shear crack width was derived by the results of experimental study and regression analysis.The results show that the values predicted by the modified formula are in good agreement with the experiment test results of bending crack width in the RC single column pier and the results gained by the proposed calculation method for shear crack width are very close to the measured values of the experiment.The rationality of the proposed method in this paper is verified.
The experimental research of seven small scaled RC single column pier models with small shear-span ratio was carried out.The comparison and discussion of applicabilities of different codes in calculating bending crack width of RC single column pier were presented.A modified formula for bending crack width calculation was developed by revising the nominal tensile stress computational formula.Considering the contribution of concrete shear strength,reinforce dowel action,aggregate biting force,and vertical components of the tensile force of bending-up steel bar and stirrup,to the shear,the calculation formula for shear crack width was derived by the results of experimental study and regression analysis.The results show that the values predicted by the modified formula are in good agreement with the experiment test results of bending crack width in the RC single column pier and the results gained by the proposed calculation method for shear crack width are very close to the measured values of the experiment.The rationality of the proposed method in this paper is verified.
引文
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[9]江见鲸,李杰,金伟良.高等混凝土结构理论[M].北京:中国建筑工业出版社,2007.JIANG Jian-jing,LI Jie,JIN Wei-liang.AdvancedTheory of Concrete Structures[M].Beijing:ChinaArchitecture&Building Press,2007.
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[13]聂建国,沈聚敏.钢筋混凝土梁长期斜裂缝宽度的试验研究[J].建筑结构学报,1995,16(3):3-9.NIE Jian-guo,SHEN Ju-min.Experimental Study onLong-term Diagonal Crack Width of Reinforced Con-crete Beams[J].Journal of Building Structures,1995,16(3):3-9.
[14]COLOTTI V,SPADEA G.An Analytical Model forCrack Control in Reinforced Concrete Elements Un-der Combined Forces[J].Cement and Concrete Com-posites,2005,27(4):503-514.
[15]Comite Euro-international du Beton.CEB-FIP ModelCode 1990:Design Code[M].London:Thomas Tel-ford Limited,1993.
[16]JTJ267—98,港口工程混凝土结构设计规范[S].JTJ 267—98,Design Code for Harbor EngineeringConcrete Structure[S].
[17]SDJ20—78,水工钢筋混凝土结构设计规范[S].SDJ 20—78,Design Code for Offshore Reinforced Con-crete Structure[S].
[18]GB50010—2002,混凝土结构设计规范[S].GB 50010—2002,Code for Design of Concrete Struc-tures[S].
[19]TB10002.3—99,铁路桥涵钢筋混凝土和预应力混凝土结构设计规范[S].TB 10002.3—99,Code for Design on Reinforced andPrestressed Concrete Structure of Railway Bridge and Culvert[S].
[2]项贻强,唐国斌.混凝土箱梁桥的开裂机理及控制[M].北京:中国水利水电出版社,2010.XIANG Yi-qiang,TANG Guo-bin.Cracking Mecha-nism and Control of Concrete Box Girder Bridge[M].Beijing:China Water Power Press,2010.
[3]曾庆响,韩大建.预应力混凝土箱梁桥的裂缝防治研究现状[J].工程力学,2010,27(增1):184-188.ZENG Qing-xiang,HAN Da-jian.A Review of CrackPrevention in Prestressed Concrete Box Girder Bridg-es[J].Engineering Mechanics,2010,27(S1):184-188.
[4]邱文亮,姜萌,张哲.城市独柱墩桥梁结构体系非线性抗震研究[J].地震工程与工程振动,2010,30(1):161-166QIU Wen-liang,JIANG Meng,ZHANG Zhe.Studyon Nonlinear Seismic Behavior of Urban Bridges withSingle-column Pier[J].Journal of Earthquake Engi-neering and Engineering Vibration,2010,30(1):161-166
[5]武宏晓.连续独柱墩桥梁抗倾覆安全评价及加固设计方案[J].城市道桥与防洪,2010(4):88-91WU Hong-xiao.Overturning Resistant Safety Evalua-tion and Reinforcing Design Scheme of ContinuousSingle Column Pier Bridge[J].Urban Roads Bridges&Flood Control,2010(4):88-91
[6]JTG D62—2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].JTG D62—2004,Code for Design of Highway Rein-forced Concrete and Prestressed Concrete Bridges andCulverts[S].
[7]项贻强,刘成熹,唐国斌,等.计算独柱墩帽梁承载力的改进撑杆-系杆模型[J].浙江大学学报:工学版,2012,46(7):1248-1254,1300.XIANG Yi-qiang,LIU Cheng-xi,TANG Guo-bin,et al.Modified STM Model for Calculating InclinedSection Strength of Reinforcement Concrete CapBeam of Single Column Pier[J].Journal of ZhejiangUniversity:Engineering Science,2012,46(7):1248-1254,1300.
[8]项贻强,唐国斌,晁春锋,等.某连接线连续箱梁桥钢筋混凝土桥墩开裂受力分析咨询报告[R].杭州:浙江大学,2009.XIANG Yi-qiang,TANG Guo-bin,CHAO Chun-feng,et al.Mechanical Behavior Analysis and Reportof a Reinforced Concrete Pier in Continuous BoxGirder Bridge[R].Hangzhou:Zhejiang University,2009.
[9]江见鲸,李杰,金伟良.高等混凝土结构理论[M].北京:中国建筑工业出版社,2007.JIANG Jian-jing,LI Jie,JIN Wei-liang.AdvancedTheory of Concrete Structures[M].Beijing:ChinaArchitecture&Building Press,2007.
[10]HUTCHINSON T C,WANG T.Evaluation of CrackSpacing in Reinforced Concrete Shear Walls[J].Jour-nal of Structural Engineering,2009,135(5):499-508.
[11]赵国藩,李树瑶,廖婉卿,等.钢筋混凝土结构的裂缝控制[M].北京:海洋出版社,1991.ZHAO Guo-fan,LI Shu-yao,LIAO Wan-qing,et al.Crack Control of Reinforced Concrete Structures[M].Beijing:Ocean Press,1991.
[12]聂建国,沈聚敏.钢筋砼梁的斜裂缝宽度[J].建筑结构,1994(6):33-36,32.NIE Jian-guo,SHEN Ju-min.Calculating Shear CrackWidth of Reinforced Concrete Beam[J].BuildingStructure,1994(6):33-36,32.
[13]聂建国,沈聚敏.钢筋混凝土梁长期斜裂缝宽度的试验研究[J].建筑结构学报,1995,16(3):3-9.NIE Jian-guo,SHEN Ju-min.Experimental Study onLong-term Diagonal Crack Width of Reinforced Con-crete Beams[J].Journal of Building Structures,1995,16(3):3-9.
[14]COLOTTI V,SPADEA G.An Analytical Model forCrack Control in Reinforced Concrete Elements Un-der Combined Forces[J].Cement and Concrete Com-posites,2005,27(4):503-514.
[15]Comite Euro-international du Beton.CEB-FIP ModelCode 1990:Design Code[M].London:Thomas Tel-ford Limited,1993.
[16]JTJ267—98,港口工程混凝土结构设计规范[S].JTJ 267—98,Design Code for Harbor EngineeringConcrete Structure[S].
[17]SDJ20—78,水工钢筋混凝土结构设计规范[S].SDJ 20—78,Design Code for Offshore Reinforced Con-crete Structure[S].
[18]GB50010—2002,混凝土结构设计规范[S].GB 50010—2002,Code for Design of Concrete Struc-tures[S].
[19]TB10002.3—99,铁路桥涵钢筋混凝土和预应力混凝土结构设计规范[S].TB 10002.3—99,Code for Design on Reinforced andPrestressed Concrete Structure of Railway Bridge and Culvert[S].
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