CAJ | 학술논문

为研究混凝土收缩、徐变对结合梁斜拉桥的影响机理及时效特性，以樟树赣江二桥（主跨400 m 的双塔双索面半飘浮体系结合梁斜拉桥）为背景进行分析。采用桥梁专业软件RM 2006建立全桥有限元模型，对桥梁的时效影响机理、运营期不同构件的时效影响因素及不同结构体系的时效响应进行研究。研究结果表明，对于结合梁斜拉桥，桥面板收缩、徐变产生的主梁截面初始轴向应变是主梁中跨跨中下挠、边跨斜拉索松弛的主要原因，产生的主梁截面初始弯曲应变是主梁负弯矩出现的主要原因。桥面板收缩、恒载下桥面板徐变是引起边跨斜拉索松弛、主梁中跨跨中下挠的主要因素；桥塔收缩、徐变将引起桥塔附近斜拉索松弛，并使主梁产生局部负弯矩峰值。桥塔处竖向支座及辅助墩的设置会对结合梁斜拉桥的时变效应产生一定的不利影响，单纯从该角度来讲，全飘浮体系较其他体系更为合理。
위연구혼응토수축、서변대결합량사랍교적영향궤리급시효특성，이장수공강이교（주과400 m 적쌍탑쌍색면반표부체계결합량사랍교）위배경진행분석。채용교량전업연건RM 2006건립전교유한원모형，대교량적시효영향궤리、운영기불동구건적시효영향인소급불동결구체계적시효향응진행연구。연구결과표명，대우결합량사랍교，교면판수축、서변산생적주량절면초시축향응변시주량중과과중하뇨、변과사랍색송이적주요원인，산생적주량절면초시만곡응변시주량부만구출현적주요원인。교면판수축、항재하교면판서변시인기변과사랍색송이、주량중과과중하뇨적주요인소；교탑수축、서변장인기교탑부근사랍색송이，병사주량산생국부부만구봉치。교탑처수향지좌급보조돈적설치회대결합량사랍교적시변효응산생일정적불리영향，단순종해각도래강，전표부체계교기타체계경위합리。
To study the mechanism and time‐dependant chrematistics of influences of the con‐crete shrinkage and creep on the composite girder cable‐stayed bridge ,the Second Zhangshu Gan‐jiang River Bridge (a semi‐floating system composite girder cable‐stayed bridge with double py‐lons ,double cable planes and with a main span of 400 m) was taken as an example and was ana‐lyzed .The bridge professional software RM2006 was used to build up the finite element model for the w hole bridge of the bridge ,the time‐dependant influential mechanism of the bridge ,time‐de‐pendant influential factors of the different components of the bridge in operation period and the time‐dependant responses of the different structural systems were studied . The results of the study show that the for the composite girder cable‐stayed bridge ,the initial axial strain in the cross section of the main girder caused by the concrete shrinkage and creep of the deck slabs is the main cause leading to the midspan deflection of the central span of the main girder and to the re‐laxation of the stay cables at the side spans .The initial flexural strain in the cross section of the main girder caused by the shrinkage and creep is the main cause leading to the negative moment occurrence in the main girder .T he concrete shrinkage of the deck slabs and the concrete creep of the slabs under dead load are the main factors causing the relaxation of the stay cables at the side spans and the midspan deflection of the central span .T he concrete shrinkage and creep of the py‐lons cause the relaxation of the stay cables nearby the pylons and cause the main girder to produce the local negative moment peak values .The arrangement of the vertical bearings at the pylons and the arrangement of the auxiliary piers may cause certain adverse influence to the time‐depend‐ant effect of the composite girder bridge .As judged from the above‐mentioned ,it is considered that the full floating system is more reasonable than other systems .