桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
4期
33-38
,共6页
铁路桥%梁拱组合桥%无缝线路%设计参数%梁轨相互作用%有限元法%钢轨应力
鐵路橋%樑拱組閤橋%無縫線路%設計參數%樑軌相互作用%有限元法%鋼軌應力
철로교%량공조합교%무봉선로%설계삼수%량궤상호작용%유한원법%강궤응력
railway bridge%hybrid bridge of beam and arch%continuously welded rail%design parameter%beam-track interaction%finite element method%steel rail stress
为了解梁轨相互作用设计参数对大跨度梁拱组合桥无缝线路的影响，以兰渝线广元段某（82．9＋172＋82．9） m梁拱组合桥为例，采用ANSYS 软件建立了考虑拱肋—吊杆—主梁—桥墩—桩基—轨道梁轨系统一体化有限元模型，分析了拱肋与吊杆升温、纵向阻力模型、吊杆间距、桥墩高度、制动力率、风荷载等参数对钢轨纵向力的传递规律。结果表明：拱肋升温对钢轨应力的影响较大，计算钢轨伸缩力时，按梁体升温15℃考虑较为安全；梁拱组合桥的梁轨相互作用根据《铁路无缝线路设计规范》计算较为安全；钢轨制动力随固定墩高度的增加而增大，固定墩的墩顶水平力与其墩高基本呈线性递减关系；钢轨应力随吊杆间距的增大而增加；钢轨的最大制动拉、压应力和固定墩的墩顶水平力均与制动力率呈线性关系；风荷载作用下，钢轨应力可达5．8 M Pa以上，风速较大区域需考虑风荷载对钢轨的影响。
為瞭解樑軌相互作用設計參數對大跨度樑拱組閤橋無縫線路的影響，以蘭渝線廣元段某（82．9＋172＋82．9） m樑拱組閤橋為例，採用ANSYS 軟件建立瞭攷慮拱肋—弔桿—主樑—橋墩—樁基—軌道樑軌繫統一體化有限元模型，分析瞭拱肋與弔桿升溫、縱嚮阻力模型、弔桿間距、橋墩高度、製動力率、風荷載等參數對鋼軌縱嚮力的傳遞規律。結果錶明：拱肋升溫對鋼軌應力的影響較大，計算鋼軌伸縮力時，按樑體升溫15℃攷慮較為安全；樑拱組閤橋的樑軌相互作用根據《鐵路無縫線路設計規範》計算較為安全；鋼軌製動力隨固定墩高度的增加而增大，固定墩的墩頂水平力與其墩高基本呈線性遞減關繫；鋼軌應力隨弔桿間距的增大而增加；鋼軌的最大製動拉、壓應力和固定墩的墩頂水平力均與製動力率呈線性關繫；風荷載作用下，鋼軌應力可達5．8 M Pa以上，風速較大區域需攷慮風荷載對鋼軌的影響。
위료해량궤상호작용설계삼수대대과도량공조합교무봉선로적영향，이란투선엄원단모（82．9＋172＋82．9） m량공조합교위례，채용ANSYS 연건건립료고필공륵—조간—주량—교돈—장기—궤도량궤계통일체화유한원모형，분석료공륵여조간승온、종향조력모형、조간간거、교돈고도、제동력솔、풍하재등삼수대강궤종향력적전체규률。결과표명：공륵승온대강궤응력적영향교대，계산강궤신축력시，안량체승온15℃고필교위안전；량공조합교적량궤상호작용근거《철로무봉선로설계규범》계산교위안전；강궤제동력수고정돈고도적증가이증대，고정돈적돈정수평력여기돈고기본정선성체감관계；강궤응력수조간간거적증대이증가；강궤적최대제동랍、압응력화고정돈적돈정수평력균여제동력솔정선성관계；풍하재작용하，강궤응력가체5．8 M Pa이상，풍속교대구역수고필풍하재대강궤적영향。
To understand the effect of the design parameters of beam‐track interaction on the continuously welded rail on long span hybrid bridge of beam and arch ,a hybrid bridge of beam and arch with span arrangement (82 .9 + 172 + 82 .9 ) m on the Guangyuan section of Lanzhou‐Chongqing Railway was taken as an example ,a finite element model considering the integration of the arch rib -hanger-main beam -pier-pile foundation -beam‐track system was established ,u‐sing the software ANSYS and the effect of the design parameters ,such as the temperature rise in the arch rib and hanger ,longitudinal resistance model ,hanger spacing ,pier height ,braking force ratio and wind load ,on the longitudinal force transmission laws of the steel rail were analyzed . T he results of the analysis show that the effect of the temperature rise in the arch rib on the steel rail stress is great and w hen the steel rail expansion force is calculated ,the calculation according to the temperature rise of 15 ℃ in the beam is safe .When the beam‐track interaction of the hybrid bridge is calculated ,the calculation of the interaction according to the Code f or Design o f Rail‐way Continuous Welded Rail is safe .The braking force of the steel rail increases with the increase of the fixed pier height and the pier top horizontal force of the fixed pier basically exhibits the line‐ar decrease relationship with the height of the fixed pier .The steel rail stress increases with the in‐crease of the hanger spacing .T he maximum braking tensile and compressive stress of the steel rail and the pier top horizontal force of the fixed pier all exhibit the linear relationship with the braking force ratio .Under the action of the wind load ,the steel rail stress can be greater than 5 .8 MPa and in the area of fast wind speed ,the effect of the wind load on the steel rail should be considered .
