宽窄接缝与CA砂浆耦合伤损对无砟轨道-简支梁桥结构受力性能影响
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摘要
基于弹性地基梁体理论,考虑宽窄接缝与轨道板之间界面开裂与CA砂浆脱空耦合伤损,建立伤损状态下的CRTS Ⅱ型板式无砟轨道-简支梁桥结构有限元模型,分析宽窄接缝与CA砂浆不同伤损型式和不同位置耦合伤损尺寸在正温度梯度荷载作用下对无砟轨道-简支梁桥结构受力及变形的影响。研究结果表明:宽窄接缝与CA砂浆耦合伤损较宽窄接缝界面开裂或CA砂浆脱空单一伤损型式对结构受力与变形更为不利;当耦合伤损面积超过0.975 m×0.765 m,长度超过0.975 m或宽度超过0.51m时,轨道板拉应力超过其抗拉强度,影响结构的正常使用;随耦合伤损尺寸的增加,轨道板和CA砂浆的垂向位移均显著增大,底座板和桥梁的垂向位移呈微弱减小趋势;宽窄接缝与CA砂浆耦合伤损位于轨道板板边对结构受力和变形影响最大,耦合伤损位于板端次之,耦合伤损位于板角影响最小。
Based on elastic foundation beam theory, considering the cracking of the interface between wide-narrow juncture and track slab coupled with CA mortar void, finite element model of CRTS Ⅱ ballastless track-simple supported bridge structure under damage condition was established. Through this model, the influence of different coupled damage types and different coupled damage size at different positions on the stress and deformation of the structure under positive temperature gradient load were studied. The results show that coupled damage is more unfavorable than wide-narrow juncture crack or CA mortar void single damage type of the structural; when the coupled damage area exceed 0.975 m×0.765 m, the length exceeded 0.975 m, or the width exceeded 0.51 m, the tensile stress of the track slab exceed its tensile strength, affecting the normal use of the structure; with the increase of the coupled damage size, vertical displacements of the track slab and the CA mortar increase significantly, and vertical displacements of the base slab and the bridge decrease slightly; coupled damage which at the edge of the slab had great influence, which at the ends of the slab played the second role, and which at the corner of the slab had the least impact.
Based on elastic foundation beam theory, considering the cracking of the interface between wide-narrow juncture and track slab coupled with CA mortar void, finite element model of CRTS Ⅱ ballastless track-simple supported bridge structure under damage condition was established. Through this model, the influence of different coupled damage types and different coupled damage size at different positions on the stress and deformation of the structure under positive temperature gradient load were studied. The results show that coupled damage is more unfavorable than wide-narrow juncture crack or CA mortar void single damage type of the structural; when the coupled damage area exceed 0.975 m×0.765 m, the length exceeded 0.975 m, or the width exceeded 0.51 m, the tensile stress of the track slab exceed its tensile strength, affecting the normal use of the structure; with the increase of the coupled damage size, vertical displacements of the track slab and the CA mortar increase significantly, and vertical displacements of the base slab and the bridge decrease slightly; coupled damage which at the edge of the slab had great influence, which at the ends of the slab played the second role, and which at the corner of the slab had the least impact.
引文
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[13]REN Juanjuan,XIANG Rui,LIU Xueyi.Force characteristics of longitudinally coupled slab track turnout on bridges under temperature action[J].Transportation Research Record,2010(2159):85-90.
[2]YAN Bin,DAI Gonglian,HU Nan.Recent development of design and construction of short span high-speed railway bridges in China[J].Engineering Structures,2015,100:707-717.
[3]姜子清,王继军,江成.桥上CRTS II型板式无砟轨道伤损研究[J].铁道建筑,2014(6):117-121.JIANG Ziqing,WANG Jijun,JIANG Cheng.Research on damage of CRTS II type ballastless track on bridge[J].Railway Engineering,2014(6):117-121.
[4]赵林,刘学毅,赵华卫,等.CRTS II型板式轨道宽接缝开裂对轨道受力的影响分析[J].铁道科学与工程学报,2016,13(1):9-14.ZHAO Lin,LIU Xueyi,ZHAO Huawei,et al.The study of influence on track stress caused by the cracking at wide juncture of CRTS II prefabricated slab track[J].Journal of Railway Science and Engineering,2016,13(1):9-14.
[5]黄河山,曾毅,徐光鑫,等.桥上CRTS II型板式轨道宽接缝开裂对纵连钢筋受力特性的影响[J].铁道标准设计,2014(2):33-36.HUANG Heshan,ZENG Yi,XU Guangxin,et al.Effect on longitudinally continuous reinforcing bars mechanical property caused by the cracking at wide juncture of CRTSII slab ballastless track on bridge[J].Railway Standard Design,2014(2):33-36.
[6]刘亚男.复杂温度下Ⅱ型板式无砟轨道宽窄接缝病害影响及维修措施[D].北京:北京交通大学,2016.LIU Yanan.Research on the wide-narrow juncture diseases influence and maintenance of CRTS II slab ballastless track under complex temperature[D].Beijing:Beijing Jiaotong University,2016.
[7]刘洋,任娟娟,吴亚平,等.道岔板底脱空对桥上纵连板式无砟道岔受力性能的影响[J].中国铁道科学,2014,35(6):21-27.LIU Yang,REN Juanjuan,WU Yaping,et al.Influence of void underneath slab on mechanical behavior of longitudinally coupled slab ballastless track turnout on bridge[J].China Railway Science,2014,35(6):21-27.
[8]YAN Bin,DAI Gonglian,ZHANG Huaping.Beam-track interaction of high-speed railway bridge with ballast track[J].Journal of Central South University of Technology,2012,19(5):1447-1453.
[9]SONG X,ZHAO C,ZHU X.Influence of the elasticity of cement asphalt mortar on the temperature stress and deformation of a CRTS II slab track[C]//International Conference on Transportation on and Development,2016:152-161.
[10]刘学毅,赵坪锐,杨荣山,等.客运专线无砟轨道设计理论与设计方法[M].成都:西南交通大学,2010.LIU Xueyi,ZHAO Pingrui,YANG Rongshan,et al.Design theory and method for ballastless track on passenger dedicated line[M].Chengdu:Southwest Jiaotong University,2010.
[11]李炎.离缝对无砟轨道-简支梁桥结构体系受力性能的影响研究[D].长沙:中南大学,2017.LI Yan.Study on the influence of interface bond damage on mechanical performance of the structure system in ballastless track-simply supported bridge[D].Changsha:Central South University,2017.
[12]TG/Gw 115-2012,高速铁路无砟轨道线路维修规则(试行)[S].TG/Gw 115-2012,High-speed railway ballastless track line maintenance rules(trial)[S].
[13]REN Juanjuan,XIANG Rui,LIU Xueyi.Force characteristics of longitudinally coupled slab track turnout on bridges under temperature action[J].Transportation Research Record,2010(2159):85-90.
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