铁道科学与工程学报
鐵道科學與工程學報
철도과학여공정학보
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
2015年
4期
823-828
,共6页
铁路桥梁%连续梁 -拱组合桥%梁轨相互作用%无缝线路%有限元模型
鐵路橋樑%連續樑 -拱組閤橋%樑軌相互作用%無縫線路%有限元模型
철로교량%련속량 -공조합교%량궤상호작용%무봉선로%유한원모형
railway bridge%continuous arch bridge%continuously welded rail%track -bridge interaction%finite element analysis
研究大跨度铁路连续梁－拱组合桥与无缝线路的相互作用问题，采用非线性弹簧单元模拟梁轨接触，以某桥（82．9＋172＋82．9）m 连续梁拱桥为例，建立考虑拱肋、横撑、斜撑、吊杆、主梁、轨道以及相邻路基梁轨相互作用模型，系统分析温度荷载、活载、制动力、风荷载、混凝土收缩徐变、支座不均匀沉降作用下连续梁－拱桥无缝线路纵向力的分布规律。研究结果表明：钢轨在跨中位置对梁体升温敏感程度大于梁端位置；单线活载与制动或牵引作用下，钢轨应力在中间加载时比左、右侧加载大；纵向风力达到1 kN ／m 以上的地区，须考虑风荷载的影响；同时，混凝土收缩徐变在降温荷载工况下，对钢轨应力有不利影响；支座沉降作用下，钢轨最大应力为4．9 MPa，设计时应予以考虑。
研究大跨度鐵路連續樑－拱組閤橋與無縫線路的相互作用問題，採用非線性彈簧單元模擬樑軌接觸，以某橋（82．9＋172＋82．9）m 連續樑拱橋為例，建立攷慮拱肋、橫撐、斜撐、弔桿、主樑、軌道以及相鄰路基樑軌相互作用模型，繫統分析溫度荷載、活載、製動力、風荷載、混凝土收縮徐變、支座不均勻沉降作用下連續樑－拱橋無縫線路縱嚮力的分佈規律。研究結果錶明：鋼軌在跨中位置對樑體升溫敏感程度大于樑耑位置；單線活載與製動或牽引作用下，鋼軌應力在中間加載時比左、右側加載大；縱嚮風力達到1 kN ／m 以上的地區，鬚攷慮風荷載的影響；同時，混凝土收縮徐變在降溫荷載工況下，對鋼軌應力有不利影響；支座沉降作用下，鋼軌最大應力為4．9 MPa，設計時應予以攷慮。
연구대과도철로련속량－공조합교여무봉선로적상호작용문제，채용비선성탄황단원모의량궤접촉，이모교（82．9＋172＋82．9）m 련속량공교위례，건립고필공륵、횡탱、사탱、조간、주량、궤도이급상린로기량궤상호작용모형，계통분석온도하재、활재、제동력、풍하재、혼응토수축서변、지좌불균균침강작용하련속량－공교무봉선로종향력적분포규률。연구결과표명：강궤재과중위치대량체승온민감정도대우량단위치；단선활재여제동혹견인작용하，강궤응력재중간가재시비좌、우측가재대；종향풍력체도1 kN ／m 이상적지구，수고필풍하재적영향；동시，혼응토수축서변재강온하재공황하，대강궤응력유불리영향；지좌침강작용하，강궤최대응력위4．9 MPa，설계시응여이고필。
To study the interaction between continuous arch bridge and CWR (Continuously Welded Rail), nonlinear bar elements were used to simulate the track -bridge contact.Taking the (82.9 +172 +82.9)m prestressed concrete continuous arch bridge with concrete -filled steel tube as an example,a model was estab-lished by considering arch,derrick,girder,track and neighboring structures.The distributions of the longitudinal forces of CWR and the horizontal forces at the top of piers were systematically analyzed under the actions of ben-ding,braking,thermal effect,wind,shrinkage and creep as well as settlement of bearing.The following conclu-sions are obtained:The temperature load in beam has the greater influence on the track that lies in the middle of the beam than at the end of the beam.Under the action of live load and the braking force,the impact that the load position on the middle of structure is bigger.When strong wind reaches at the speed of 1 kN /m,it is neces-sary to consider the effect of wind load.Creep and shrinkage of concrete with drop in temperature have adverse effects on the rail.Under uneven settlement,the maximum stress in track is 4.9 MPa.When designing the rail track,the above factors should be considered.
