重载铁路8m低高度钢筋混凝土板梁疲劳性能试验研究
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摘要
为深入了解重载列车对既有铁路8 m低高度钢筋混凝土板梁疲劳性能的影响,对5根缩尺模型梁进行静力和等幅疲劳荷载试验研究。研究结果表明,梁内钢筋发生疲劳脆断后试验梁仍有较高的剩余承载力,且试验梁纯弯段裂缝宽度、混凝土及钢筋残余应变随疲劳作用次数增加呈"快速变化-缓慢变化"的两阶段变化特征。将本次试验及文献中的试验数据与国内外已有变形钢筋疲劳S-N曲线进行对比分析,进而提出更具参考价值的钢筋疲劳S-N曲线。
In order to understand the fatigue performance of 8 m low-height reinforced concrete plate-girder under heavy-haul trains, five experimental beams were tested under static load and fatigue load with constant amplitudes. The results indicate that the beams still have high bearing capacity even when brittle fracture of some reinforcements occur. Two distinctive stages, i.e., the rapidly changing stage and the slowly changing stage, were observed for the variation of the cracks width of pure bending section and the residual strain of concrete and reinforcing steel with the increase of the fatigue cycle loads. The studies of the existing S-N curves were compared with the experimental data including the present experiment and published in the references, based on which a new model for the prediction of S-N curve was proposed.
In order to understand the fatigue performance of 8 m low-height reinforced concrete plate-girder under heavy-haul trains, five experimental beams were tested under static load and fatigue load with constant amplitudes. The results indicate that the beams still have high bearing capacity even when brittle fracture of some reinforcements occur. Two distinctive stages, i.e., the rapidly changing stage and the slowly changing stage, were observed for the variation of the cracks width of pure bending section and the residual strain of concrete and reinforcing steel with the increase of the fatigue cycle loads. The studies of the existing S-N curves were compared with the experimental data including the present experiment and published in the references, based on which a new model for the prediction of S-N curve was proposed.
引文
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[3]李进洲,余志武,宋力.重载铁路桥梁疲劳变形和裂缝扩展规律研究[J].土木工程学报,2013(9):72-82.LI Jinzhou,YU Zhiwu,SONG Li.Study on fatigue deflection and crack propagation laws of heavy-haul bridges[J].China Civil Engineering Journal,2013(9):72-82.
[4]CHANG Dongli,CHAI Wonkyu.Study on the fatigue strength behavior of reinforced concrete structures[J].International Journal of Pressure Vessels and Piping,1989,40(1):51-75.
[5]李秀芬,吴佩刚,赵光仪.高强混凝土梁抗弯疲劳性能的试验研究[J].土木工程学报,1997,30(5):37-42.LI Xiufen,WU Peigang,ZHAO Guangyi.Experimental research on bending fatigue behavior of high-strength concrete beams[J].China Civil Engineering Journal,1997,30(5):37-42.
[6]王海超,贡金鑫,宋元成.钢筋混凝土梁腐蚀疲劳的试验研究[J].建筑结构学报,2004(5):105-110,123.WANG Haichao,GONG Jinxin,SONG Yuancheng.Experimental study on corrosion fatigue of RC beams[J].China Journal of Building Structures,2004(5):105-110,123.
[7]余志武,李进洲,宋力.重载铁路桥梁疲劳试验研究[J].土木工程学报,2012(12):115-126.YU Zhiwu,LI Jinzhou,SONG Li.Experimental study on fatigue behaviors of heavy-hual railway bridges[J].China Civil Engineering Journal,2012(12):115-126.
[8]LI Ke,WANG Xinling,CAO Shuangyin,et al.Fatigue behavior of concrete beams reinforced with HRBF500 steel bars[J].Structural Engineering and Mechanics,2015,53(2):311-324
[9]冯秀峰,宋玉普,朱美春.随机变幅疲劳荷载下预应力混凝土梁疲劳寿命的试验研究[J].土木工程学报,2006(9):32-38.FENG Xiufeng,SONG Yupu,ZHU Meichun.An experimental study on the fatigue life of prestressed concrete beams under random-amplitude fatigue loading[J].China Civil Engineering Journal,2006(9):32-38.
[10]蒋丽忠,伍振宇,吴忠河,等.钢筋混凝土空心梁疲劳性能试验研究[J].铁道科学与工程学报,2010(3):6-10.JIANG Lizhong,WU Zhenyu,WU Zhonghe,et al.Experimental study on fatigue of reinforced concrete hollow beams[J].China Journal of Railway Science and Engineering,2010(3):6-10.
[11]庞林飞.钢筋混凝土板疲劳损伤识别及疲劳寿命预测[D].南京:东南大学土木工程学院,2004.PANG Linfei.Fatigue cumulative damage detection and fatigue life prediction on reinforced concrete slab[D].Nanjing:Southeast University.School of Civil Engineering,2004.
[12]朱红兵,余志武,孙杰.钢筋混凝土T梁疲劳性能试验研究[J].公路交通科技,2013(12):53-58.ZHU Hongbing,YU Zhiwu,SUN Jie.Experimental research on fatigue behavior of reinforced concrete T-beam[J].Journal of Highway and Transportation Research and Development,2013(12):53-58.
[13]HANSON J M.Deign for fatigue,handbook of structure concrete[M].London:Piterman Publishing INC,1983.
[14]崔鑫,张玉玲,荣振环.大秦线8 m钢筋混凝土梁疲劳损伤分析及寿命评估[J].铁道建筑,2008(1):20-23.CUI Xin,ZHANG Yuling,RONG Zhenhuan.Fatigue damage analysis and life evaluation of 8 m reinforced concrete beam of Daqin railway[J].China Railway Engineering,2008(1):20-23.
[15]徐学东.既有铁路混凝土桥梁疲劳寿命预测及可靠性分析[J].铁道标准设计,1996,14(3):28-35.XU Xuedong.Fatigue life prediction and reliability analysis of the existing railway concrete bridges[J].Railway Standard Design,1996,14(3):28-35.
[16]钟铭,王海龙,刘仲波,等.高强钢筋高强混凝土梁静力和疲劳性能试验研究[J].建筑结构学报,2005(2):94-100.ZHONG Ming,WANG Hailong,LIU Zhongbo,et al.Experimental research on high concrete beams reinforced by high-strength bars under static loading and fatigue loading[J].Journal of Building Structures,2005(2):94-100.