组合梁疲劳后的刚度退化规律及计算模型(4)
4 结 论
(1)试验梁的疲劳破坏试验表明在经历200万次疲劳加载之后,其刚度退化幅度达到23.8%,组合梁刚度退化规律呈现出较明显的单调递减“S”型曲线。
(2)试验梁的刚度与残余挠度、相对滑移之间存在的较强的负相关性,残余挠度的增长体现了组合梁内部的疲劳损伤,相对滑移的增长则主要体现了组合梁抗剪连接程度的弱化。因此,在疲劳荷载作用下,组合梁整体刚度退化是材料疲劳损伤和抗剪连接程度退化的宏观表现。
(3)通过试验数据拟合,建立用于计算钢-混凝土组合梁刚度退化计算模型,与同类型试验梁疲劳试验结果较为吻合。该模型实现对刚度退化的定量描述,可用于同类型组合梁疲劳性能退化及损伤情况的评估和预测。
[1] 杨骁,李晓伟,汪德江.界面掀起和轴力对组合梁动力弯曲特性的影响[J].振动与冲击,2016,35(8):124-131.
YANG Xiao,LI Xiaowei,WANG of the interfacial uplift and axial load on dynamic bending characteristics of composite beams[J].Journal of Vibration and Shock,2016,35(8):124-131.
[2] 聂建国,王宇航.钢-混凝土组合梁疲劳性能研究综述[J].工程力学,2012,29(6):1-11.
NIE Jianguo,WANG status on fatigue behavior of steel-concrete composite beams[J].Engineering Mechanics,2012,29(6):1-11.
[3] COUGHLIN R,WALBRIDGE testing and analysis of aluminum welds under in-service highway bridge loading conditions[J].Journal of Bridge Engineering,2012,17(3):409.
[4] 侯忠明,夏禾,王元清,等.钢-混凝土组合梁动力折减系数研究[J].振动与冲击,2015,34(4):74-81.
HOU Zhongming,XIA He,WANG Yuanqing,et reduction coefficients for a steel-concrete composite beam[J].Journal of Vibration and Shock,2015,34(4):74-81.
[5] HANSWILLE G,PORSCH M,USTUNDAG of headed studs subjected to fatigue I:experimental study[J].Journal of Constructional Steel Research,2007,63(4):485.
[6] 汪炳,黄侨,刘小玲.疲劳荷载作用下栓钉连接件的抗剪承载力退化规律[J].哈尔滨工业大学学报,2016,48(9):76-82.
WANG Bing,HUANG Qiao,LIU capacity degradation law of stud connectors under fatigue loading[J].Harbin Institute of Technology,2016,48(9):76-82.
[7] 李小珍,谭清泉,肖林.钢-混凝土组合梁疲劳性能试验研究[J].桥梁建设,2017,47(6):12-17.
LI Xiaozhen,TAN Qingquan,XIAO study of fatigue behavior of steel and concrete composite beams[J].Bridge Construction,2017,47(6):12-17.
[8] 刘小洁,李亚平,刘亚茹,等.钢-混凝土组合箱梁的抗弯疲劳性能试验研究[J].铁道科学与工程学报,2015,12(5):1123-1129.
LIU Xiaojie,LI Yaping,LIU Yaru,et research on fatigue behavior of steel-concrete composite box girder[J].Journal of Railway Science and Engineering,2015,12(5):1123-1129.
[9] 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 Guangtai,PENG 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.
[10] 钢-混凝土组合桥梁设计规范:GB —2013[S].北京:中国计划出版社,2013.
[11] 公路钢结构桥梁设计规范:JTG D64—2015[S].北京:人民交通出版社,2015.
[12] WANG B,HUANG Q,LIU X L,et investigation of steel-concrete composite beams with different degrees of shear connection under monotonic and fatigue loads[J].Advances in Structural Engineering,2018,21(2):227-240.
[13] 孟宪宏.混凝土疲劳剩余强度试验及理论研究[D].大连:大连理工大学,2006.
[14] 李莉,谢里阳,何雪浤,等.疲劳加载下金属材料的强度退化规律[J].机械强度,2010,32(6):967-971.
LI Li,XIE Liyang,HE Xuehong,et degradation law of metallic material under fatigue loading[J].Journal of Mechanical Strength,2010,32(6):967-971.
[15] 卢明奇,杨庆山,杨娜.考虑到刚度退化的铁路低配筋混凝土桥墩抗震评估方法[J].中国铁道科学,2011,32(3):41-46.
LU Mingqi,YANG Qingshan,YANG evaluation method of RC railway piers with low steel ratios considering stiffness degradation[J].China Railway Science,2011,32(3):41-46.
[16] 辛学忠,郭向荣.铁路桥梁刚度描述方法[J].中国铁道科学,2007,28(5):31-36.
XIN Xuezhong,GUO for describing the stiffness of railway bridges [J].China Railway Science,2007,28(5):31-36.
[17] 朱红兵,赵耀,李秀,等.疲劳荷载作用下钢筋混凝土梁的刚度退化规律及计算公式[J].土木建筑与环境工程,2014,36(2):1-13.
ZHU Hongbing,ZHAO Yao,LI Xiu,et concrete beam’s stiffness degeneration regulation and its calculation formula under the action of fatigue load[J].Journal of Civil,Architectural &Environment Engineering,2014,36(2):1-13.
[18] 廉伟,姚卫星.复合材料层压板剩余刚度——剩余强度关联模型[J].复合材料学报,2008,25(5):151-156.
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