危旧预应力混凝土箱梁承载性能足尺试验
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摘要
为获得危旧混凝土桥梁的真实承载性能,通过对足尺危旧预应力混凝土小箱梁进行抗弯和抗剪承载性能试验,研究危旧预应力混凝土小箱梁受力退化行为。通过足尺危旧预制箱梁残余承载能力试验,量测分析了试验梁的荷载、挠度、应变、裂缝宽度等,对危旧小箱梁的残余抗弯、抗剪极限承载能力及刚度进行了分析,得出危旧预制箱梁抗弯、抗剪受力性能及破坏机理。将足尺试验结果与承载力计算值以及公路—I级设计内力值进行比较,分析危旧混凝土小箱梁的实际承载性能。引入损伤折减系数,建立危旧混凝土箱梁极限承载力计算公式。试验结果表明:结构损伤降低了箱梁的承载性能,试验梁在未开裂阶段的挠度不满足公路桥规对活载刚度的验算要求,抗弯足尺试验得到的抗弯承载力与抗弯承载力计算结果基本相同,比主梁设计内力弯矩值高70%;抗剪足尺试验结果比主梁设计内力剪力值分别高32%和37%;引入损伤折减系数后的抗弯、抗剪承载力计算公式可以较准确的评估危旧混凝土小箱梁的承载能力,可为我国大量现役混凝土小箱梁的评估与维护提供参考。
In order to obtain the true bearing capacity of dangerous and old pre-stressed concrete box girder bridges, experiments on flexural and shear bearing capacity of full-scale dangerous and old pre-stressed concrete small box girders are conducted to study the mechanical degradation behavior of dangerous and old pre-stressed concrete box girders. Through the residual bearing capacity test of the full-scale prefabricated box girder, the load,deflection, strain and crack width of the test girders are measured and analyzed. The residual bending and shear ultimate capacity and stiffness of the small box girders are analyzed. The bending and shear behavior and failure mechanism of precast box girders in danger are obtained. The comparisons between the results of full-scale test and the calculated value of bearing capacity and also the design value of the internal force of I-Class highway are operated to analyze the actual performance of the small box girder made of dilapidated concrete. The damage reduction coefficient is introduced to establish the formula of ultimate bearing capacity of the girder. The test results stated that the structural damage affected the bearing performance of this box girder. The deflection of the test girder in the uncracked stage did not meet the proof stiffness requirements under the variable load of highway bridge. The calculated results of the flexural bearing capacity are basically identified with the result from full scale flexural test, which is 70% higher than the design bending moment by the internal force of the main girder. The results of full-scale shear tests are respectively 32% and 37% higher than the internal shear design values of the girder. The formulas with damage reduction coefficient for calculating the bending and shearing capacity of the concrete box girders is applicable to evaluate the bearing capacity of the dilapidated concrete girders with more accurate results, which can provide a reference for the evaluation and maintenance of massive existing small concrete box girders in China.
In order to obtain the true bearing capacity of dangerous and old pre-stressed concrete box girder bridges, experiments on flexural and shear bearing capacity of full-scale dangerous and old pre-stressed concrete small box girders are conducted to study the mechanical degradation behavior of dangerous and old pre-stressed concrete box girders. Through the residual bearing capacity test of the full-scale prefabricated box girder, the load,deflection, strain and crack width of the test girders are measured and analyzed. The residual bending and shear ultimate capacity and stiffness of the small box girders are analyzed. The bending and shear behavior and failure mechanism of precast box girders in danger are obtained. The comparisons between the results of full-scale test and the calculated value of bearing capacity and also the design value of the internal force of I-Class highway are operated to analyze the actual performance of the small box girder made of dilapidated concrete. The damage reduction coefficient is introduced to establish the formula of ultimate bearing capacity of the girder. The test results stated that the structural damage affected the bearing performance of this box girder. The deflection of the test girder in the uncracked stage did not meet the proof stiffness requirements under the variable load of highway bridge. The calculated results of the flexural bearing capacity are basically identified with the result from full scale flexural test, which is 70% higher than the design bending moment by the internal force of the main girder. The results of full-scale shear tests are respectively 32% and 37% higher than the internal shear design values of the girder. The formulas with damage reduction coefficient for calculating the bending and shearing capacity of the concrete box girders is applicable to evaluate the bearing capacity of the dilapidated concrete girders with more accurate results, which can provide a reference for the evaluation and maintenance of massive existing small concrete box girders in China.
引文
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[14]张建仁,彭晖,张克波,等.锈蚀钢筋混凝土旧桥超限及极限荷载作用的现场破坏性试验研究[J].工程力学,2009,26(增刊Ⅱ):213-224.Zhang Jianren,Peng Hui,Zhang Kebo,et al.Test study on overload and ultimate behavior of old reinforced concrete bridge through destructive test of corroded bridge[J].Engineering Mechanics,2009,26(Suppl 2):213-224.(in Chinese)
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[16]金浏,苏晓,杜修力.钢筋混凝土梁受弯破坏及尺寸效应的细观模拟分析[J].工程力学,2018,35(10):27-36.Jin Liu,Su Xiao,Du Xiuli.Meso-scale simulations on flexural failure and size effect of reinforced concrete beams[J].Engineering Mechanics,2018,35(10):27-36.(in Chinese)
[17]陈悦驰,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式有限元分析[J].工程力学,2014,31(增刊1):51-58.Chen Yuechi,Wu Qingxiong,Chen Baochun.Failure mode of hinged joint in assembly voided slab bridge by finite element analysis[J].Engineering Mechanics,2014,31(Suppl 1):51-58.(in Chinese)
[18]王渠,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式试验研究[J].工程力学,2014,31(增刊1):115-120.Wang Qu,Wu Qingxiong,Chen Baochun.Test study on the failure mode of hinged in assembly voided slab bridge[J].Engineering Mechanics,2014,31(Suppl 1):115-120.(in Chinese)
[19]刘金福.服役20年预应力混凝土连续梁桥静载试验研究[J].桥梁建设,2013,43(5):75-80.Liu Jinfu.Study of static load tests for a prestressed concrete continuous girder bridge in service of 20 years[J].Bridge Construction,2013,43(5):75-80.(in Chinese)
[20]方志,汪建群,何鑫,等.预应力混凝土简支箱梁受力性能足尺模型试验[J].中国公路学报,2011,24(6):49-56.Fang Zhi,Wang Jianqun,He Xin,et al.Full-scale model test of loading behavior of prestressed concrete simply supported box girder.[J].China Journal of Highway and Transport,2011,24(6):49-56.(in Chinese)
[2]Zhang J,Li C,Xu F,et al.Test and analysis for ultimate load-carrying capacity of existing reinforced concrete arch ribs[J].Journal of Bridge Engineering,2015,12(1):4-12.
[3]Douglas B M,Maragakis E A,Nath B.Static deformations of bridges from quick-release dynamic experiments[J].Journal of Structural Engineering,1990,116(8):2201-2213.
[4]宗周红,任伟新,郑振飞.既有桥梁承载能力评估方法[J].地震工程与工程振动,2005,25(5):147-152.Zong Zhouhong,Ren Weixin,Zheng Zhenfei.Load-carrying capacity assessment methods of existing bridges[J].Earthquake Engineering and Engineering Vibration,2005,25(5):147-152.(in Chinese)
[5]Maksymowicz M,Cruz P J S,Bien J.Load capacity of damaged RC slab spans of railway-bridges[J].Archives of Civil&Mechanical Engineering,2011,11(4):963-978.
[6]Bagge N,Popescu C,Elfgren L.Failure tests on concrete bridges:Have we learnt the lessons[J].Structure and Infrastructure Engineering,2018,14(3):292-319.
[7]Jorgenson J L,Larson W.Field testing of a reinforced concrete highway bridge to collapse[J].Transportation Research Record:Journal of the Transportation Research Board,1976,607:66-71.
[8]Miller R A,Aktan A E,Shahrooz B M.Destructive testing of decommissioned concrete slab bridge[J].Journal of Structural Engineering,1994,120(7):2176-2198.
[9]Harries K A.Structural testing of prestressed concrete girders from the lake view drive bridge[J].Journal of Bridge Engineering,2009,14(2):78-92.
[10]Lantsoght E,Van Der Veen C,De Boer A,et al.Collapse test and moment capacity of the ruytenschildt reinforced concrete slab bridge[J].Structure and Infrastructure Engineering,2017,13(9):1130-1145.
[11]Bagge N,Nilimaa J,Elfgren L.In-situ methods to determine residual prestress forces in concrete bridges[J].Engineering Structures,2017,135:41-52.
[12]Bagge N,Plos M,Popescu C.A multi-level strategy for successively improved structural analysis of existing concrete bridges:Examination using a prestressed concrete bridge tested to failure[J].Structure and Infrastructure Engineering,2019,15(2):27-53.
[13]Zhang J,Peng H,Cai C.Field study of overload behavior of an existing reinforced concrete bridge under simulated vehicle loads[J].Journal of Bridge Engineering,2010,16(2):226-237.
[14]张建仁,彭晖,张克波,等.锈蚀钢筋混凝土旧桥超限及极限荷载作用的现场破坏性试验研究[J].工程力学,2009,26(增刊Ⅱ):213-224.Zhang Jianren,Peng Hui,Zhang Kebo,et al.Test study on overload and ultimate behavior of old reinforced concrete bridge through destructive test of corroded bridge[J].Engineering Mechanics,2009,26(Suppl 2):213-224.(in Chinese)
[15]Zhang J,Peng H,Cai C.Destructive testing of a decommissioned reinforced concrete bridge[J].Journal of Bridge Engineering,2012,18(6):564-569.
[16]金浏,苏晓,杜修力.钢筋混凝土梁受弯破坏及尺寸效应的细观模拟分析[J].工程力学,2018,35(10):27-36.Jin Liu,Su Xiao,Du Xiuli.Meso-scale simulations on flexural failure and size effect of reinforced concrete beams[J].Engineering Mechanics,2018,35(10):27-36.(in Chinese)
[17]陈悦驰,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式有限元分析[J].工程力学,2014,31(增刊1):51-58.Chen Yuechi,Wu Qingxiong,Chen Baochun.Failure mode of hinged joint in assembly voided slab bridge by finite element analysis[J].Engineering Mechanics,2014,31(Suppl 1):51-58.(in Chinese)
[18]王渠,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式试验研究[J].工程力学,2014,31(增刊1):115-120.Wang Qu,Wu Qingxiong,Chen Baochun.Test study on the failure mode of hinged in assembly voided slab bridge[J].Engineering Mechanics,2014,31(Suppl 1):115-120.(in Chinese)
[19]刘金福.服役20年预应力混凝土连续梁桥静载试验研究[J].桥梁建设,2013,43(5):75-80.Liu Jinfu.Study of static load tests for a prestressed concrete continuous girder bridge in service of 20 years[J].Bridge Construction,2013,43(5):75-80.(in Chinese)
[20]方志,汪建群,何鑫,等.预应力混凝土简支箱梁受力性能足尺模型试验[J].中国公路学报,2011,24(6):49-56.Fang Zhi,Wang Jianqun,He Xin,et al.Full-scale model test of loading behavior of prestressed concrete simply supported box girder.[J].China Journal of Highway and Transport,2011,24(6):49-56.(in Chinese)