收缩徐变对混凝土斜拉桥成桥状态的影响分析  

Analysis of the Effects of Shrinkage and Creep on the Finished State of Cable-Stayed Concrete Bridges

作　　者：李熠[1] 于磊[1] 

机构地区：[1]中国水电顾问集团中南勘测设计研究院,湖南长沙410014

出　　处：《国防交通工程与技术》2009年第6期27-30,共4页Traffic Engineering and Technology for National Defence

摘　　要：运用最小弯曲能量法和应力平衡法相结合的方法来确定混凝土斜拉桥的合理成桥状态,就不同成桥状态下收缩徐变对主梁弯矩的影响程度进行了分析,并对其原因进行了探讨。总结了收缩徐变对结构受力影响的普遍规律,收缩徐变在斜拉桥桥塔附近梁段将产生负弯矩、在跨中附近梁段将产生正弯矩。得出了主梁中预应力的配置以及弯矩的调整情况都会对收缩徐变改变主梁弯矩的程度造成影响这一结论。并对不同成桥状态下收缩徐变趋于稳定后的主梁弯矩进行了比较,得出不同成桥状态下收缩徐变趋于稳定后主梁弯矩比较接近这一规律。Upon the basis of using a comprehensive method that combines the Minimum Bending Energy Method and the Stress-Balance Method to determine the reasonable finished state of the concrete cable- stayed bridge, the effects of shrinkage and creep on the bending moment of the main beam, which is in different finished states, are analyzed in the paper, with the causes explored. Also in the paper summed up are the general laws of the effects of shrinkage and creep on the internal forces of the structure, which show that the negative moment will be produced in the part of the beam near the towers and the positive moment will be produced in the part of the beam near the mid-span. The result of the research leads to the conclusion that both of the configuration of pre-stress and the adjustment of the bending moment are influential in the change of the bending moment of the main beam. And after comparing the different bending moments of the main beam in different finished states when shrinkage and creep have tended to stay stable, the bending moments of the main beam in different finished states are found to be approximately the same.

关 键 词：斜拉桥 成桥状态 收缩 徐变 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]