铁道建筑
鐵道建築
철도건축
RAILWAY ENGINEERING
2014年
5期
5-8
,共4页
混凝土徐变%预拱度%徐变系数%预测模型
混凝土徐變%預拱度%徐變繫數%預測模型
혼응토서변%예공도%서변계수%예측모형
Concrete creep%Camber%Creep coefficient%Prediction model
铁路桥对预拱度要求较为严格，而混凝土的徐变又是在预拱度设置中必须考虑的关键因素。本文以实际工程郑焦城际铁路跨连霍高速公路特大桥为依托，建立桥梁有限元模型，并通过短期徐变试验采集数据，将试验数据和现有模型对比发现 CEB-FIP 1990模型与实测数据的差异系数较小。利用实测数据对 CEB-FIP 1990模型进行修正，并验证了修正后模型的可靠性，然后将该修正模型应用到桥梁的预拱度计算中。
鐵路橋對預拱度要求較為嚴格，而混凝土的徐變又是在預拱度設置中必鬚攷慮的關鍵因素。本文以實際工程鄭焦城際鐵路跨連霍高速公路特大橋為依託，建立橋樑有限元模型，併通過短期徐變試驗採集數據，將試驗數據和現有模型對比髮現 CEB-FIP 1990模型與實測數據的差異繫數較小。利用實測數據對 CEB-FIP 1990模型進行脩正，併驗證瞭脩正後模型的可靠性，然後將該脩正模型應用到橋樑的預拱度計算中。
철로교대예공도요구교위엄격，이혼응토적서변우시재예공도설치중필수고필적관건인소。본문이실제공정정초성제철로과련곽고속공로특대교위의탁，건립교량유한원모형，병통과단기서변시험채집수거，장시험수거화현유모형대비발현 CEB-FIP 1990모형여실측수거적차이계수교소。이용실측수거대 CEB-FIP 1990모형진행수정，병험증료수정후모형적가고성，연후장해수정모형응용도교량적예공도계산중。
The higher quality of camber is required in railway bridge construction and the creep of concrete is the key factor which must be considered in camber setting. Based on the Zhengjiao intercity railway super large bridge across the Lianhuo highway,this paper proposed a finite element model of bridge,collected data through short-term creep test and concluded that the coefficient of variation between the CEB-FIP 1990 model value and the measured data is smaller according to the test data and the existing model comparison. Finally,the CEB-FIP 1990 model is corrected by measured data and verified the reliability of the revised model which can be used to bridge camber calculation.
