带疲劳损伤的钢-混凝土组合梁受力性能试验研究
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摘要
钢-混凝土组合梁在桥梁结构中应用广泛.车辆荷载会造成组合梁疲劳损伤的不断累积,从而对结构安全产生不利影响.为了研究疲劳损伤对钢-混凝土组合梁受力性能的影响,对7根组合梁试件开展了单调静力加载试验,其中5根组合梁试件在开展静力试验前经历了100万次的等幅疲劳加载.试验结果表明:在经历100万次的疲劳加载后,疲劳损伤会导致组合梁的极限变形能力降低,但组合梁的延性系数仍大于4.6,最终破坏形态均属于弯曲破坏;疲劳加载使钢材发生了强化效应,组合梁的屈服荷载均有所提高;部分抗剪连接组合梁的极限承载能力普遍降低,最大降幅约为初始极限承载力的7.3%;在抗剪连接程度相同的情况下,采用直径13或16 mm栓钉对组合梁的极限承载力无明显影响.
Steel-concrete composite beams have been widely used in bridge structures,and their fatigue damage caused by vehicle loads has been accumulating,which is adverse to the structure safety. In order to investigate the influence of the fatigue damage on the mechanical performance of steel-concrete composite beams,monotonic static tests were conducted on seven composite beams,of which five composite beams had previously suffered 1 000 000 cycles of constant amplitude fatigue loading. Experimental results indicate that(1) after 1000000 cycles of fatigue loading,the fatigue damage causes the ultimate deformability of the composite beams to decrease,but still with a ductility coefficient of greater than 4. 6,and the final failure pattern belongs to the flexible failure;(2) the fatigue loading leads to a strengthening effect of steel material,and the yielding loads of the composite beams are correspondingly improved;(3) the ultimate bearing capacities of the composite beams with partial shear connection generally decrease,and the maximum drop reaches 7. 3% of the initial ultimate bearing capacity; and(4) using the stud of a diameter of 13 mm or 16 mm has no significant effect on the ultimate bearing capacity of the composite beams when they are of the same shear connection degree.
Steel-concrete composite beams have been widely used in bridge structures,and their fatigue damage caused by vehicle loads has been accumulating,which is adverse to the structure safety. In order to investigate the influence of the fatigue damage on the mechanical performance of steel-concrete composite beams,monotonic static tests were conducted on seven composite beams,of which five composite beams had previously suffered 1 000 000 cycles of constant amplitude fatigue loading. Experimental results indicate that(1) after 1000000 cycles of fatigue loading,the fatigue damage causes the ultimate deformability of the composite beams to decrease,but still with a ductility coefficient of greater than 4. 6,and the final failure pattern belongs to the flexible failure;(2) the fatigue loading leads to a strengthening effect of steel material,and the yielding loads of the composite beams are correspondingly improved;(3) the ultimate bearing capacities of the composite beams with partial shear connection generally decrease,and the maximum drop reaches 7. 3% of the initial ultimate bearing capacity; and(4) using the stud of a diameter of 13 mm or 16 mm has no significant effect on the ultimate bearing capacity of the composite beams when they are of the same shear connection degree.
引文
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[9]WANG Y H,NIE J G,LI J J.Study on fatigue property of steel-concrete composite beams and studs[J].Journal of Constructional Steel Research,2014,94:1-10.
[10]杨涛,林广泰,彭修宁.部分抗剪连接钢-预制混凝土板组合梁疲劳性能试验研究[J].武汉理工大学学报,2016,38(1):54-58.YANG Tao,LIN Guang-tai,PENG Xiu-ning.Experimental study on fatigue behavior of steel-precast concrete slab composite beams with partial shear connection[J].Journal of Wuhan University of Technology,2016,38(1):54-58.
[11]邢颖,徐杰,韩庆华,等.部分剪力连接的橡胶集料混凝土-钢组合梁疲劳性能试验研究[J].湖南大学学报(自然科学版),2016,43(7):32-42.XING Ying,XU Jie,HAN Qing-hua,et al.Experimental study on the fatigue behavior of partial shear connected composite beam with crumb rubber concrete[J].Journal of Hunan University(Natural Sciences),2016,43(7):32-42.
[12]HOLMEN J O.Fatigue of concrete by constant and variable amplitude loading[J].ACI Special Publication,Fatigue of Concrete Structures,1982,75:71-110.
[13]HANSWILLE G,PORSCH M,USTUNDAG C.Resistance of headed studs subjected to fatigue loading(Part I):Experimental study[J].Journal of Constructional Steel Research,2007,63(4):475-484.
[14]HANSWILLE G,PORSCH M,USTUNDAG C.Resistance of headed studs subjected to fatigue loading(Part II):Analytical study[J].Journal of Constructional Steel Research,2007,63(4):485-493.
[15]Eurocode 3,Design of Steel Structures,Part 1-9:Fatigue:BS EN 1993-1-9—2005[S].
[2]RICHARD Yen J Y,LIN Y,LAI M T.Composite beams subjected to static and fatigue loads[J].Journal of Structural Engineering,1997,123(6):765-771.
[3]AHN J H,KIM S H,JEONG Y J.Fatigue experiment of stud welded on steel plate for a new bridge deck system[J].Steel and Composite Structures,2007,7(5):391-404.
[4]LEE P G,SHIM C S,CHANG S P.Static and fatigue behavior of large stud shear connectors for steel-concrete composite bridges[J].Journal of Constructional Steel Research,2005,61(9):1270-1285.
[5]HIGASHIYAMA H,YOSHIDA K,INAMOTO K,et al.Fatigue of headed studs welded with improved ferrules under rotating shear force[J].Journal of Constructional Steel Research,2014,92(1):211-218.
[6]杨涛.钢-混凝土组合梁疲劳性能研究进展[J].河北工程大学学报,2010,27(1):16-20.YANG Tao.Advances in fatigue performance of steel-concrete composite beams[J].Journal of Hebei University of Engineering,2010,27(1):16-20.
[7]杨勇,周现伟,薛建阳,等.带钢板-混凝土组合桥面板的组合梁疲劳性能试验研究[J].土木工程学报,2012,45(6):123-131.YANG Yong,ZHOU Xian-wei,XUE Jian-yang,et al.Experiment study on fatigue behavior of composite girders with steel plate-concrete composite bridge decks[J].China Civil Engineering Journal,2012,45(6):123-131.
[8]LIN W W,YODA T,TANIGUCHI N.Fatigue tests on straight steel-concrete composite beams subjected to hogging moment[J].Journal of Constructional Steel Research,2013,80(1):42-56.
[9]WANG Y H,NIE J G,LI J J.Study on fatigue property of steel-concrete composite beams and studs[J].Journal of Constructional Steel Research,2014,94:1-10.
[10]杨涛,林广泰,彭修宁.部分抗剪连接钢-预制混凝土板组合梁疲劳性能试验研究[J].武汉理工大学学报,2016,38(1):54-58.YANG Tao,LIN Guang-tai,PENG Xiu-ning.Experimental study on fatigue behavior of steel-precast concrete slab composite beams with partial shear connection[J].Journal of Wuhan University of Technology,2016,38(1):54-58.
[11]邢颖,徐杰,韩庆华,等.部分剪力连接的橡胶集料混凝土-钢组合梁疲劳性能试验研究[J].湖南大学学报(自然科学版),2016,43(7):32-42.XING Ying,XU Jie,HAN Qing-hua,et al.Experimental study on the fatigue behavior of partial shear connected composite beam with crumb rubber concrete[J].Journal of Hunan University(Natural Sciences),2016,43(7):32-42.
[12]HOLMEN J O.Fatigue of concrete by constant and variable amplitude loading[J].ACI Special Publication,Fatigue of Concrete Structures,1982,75:71-110.
[13]HANSWILLE G,PORSCH M,USTUNDAG C.Resistance of headed studs subjected to fatigue loading(Part I):Experimental study[J].Journal of Constructional Steel Research,2007,63(4):475-484.
[14]HANSWILLE G,PORSCH M,USTUNDAG C.Resistance of headed studs subjected to fatigue loading(Part II):Analytical study[J].Journal of Constructional Steel Research,2007,63(4):485-493.
[15]Eurocode 3,Design of Steel Structures,Part 1-9:Fatigue:BS EN 1993-1-9—2005[S].