收缩徐变对砼斜拉桥索力和主梁标高的影响  

作　　者：王剑[1] 杜柏松[1] 汪东[1] 

机构地区：[1]重庆交通大学,重庆400074

出　　处：《黑龙江科技信息》2012年第10期261-262,共2页Heilongjiang Science and Technology Information

基　　金：国家自然科学基金(项目编号:50908246);重庆市自然科学基金(项目编号:CSTC;2009BB6049)联合资助

摘　　要：收缩徐变是混凝土材料固有的时变特性,会导致混凝土结构受力与变形随着时间的变化而变化。斜拉桥属于高次超静定结构,其受力和变形受收缩徐变的影响更加明显,本文为了研究收缩徐变对这种复杂超静定结构受力和变形的影响,以某双塔单索面混凝土斜拉桥的某一施工阶段为例,通过理论计算和实际监测,研究分析了在某一挂篮移动阶段,混泥土收缩徐变在短时间范围内对拉索索力及主梁标高的影响。研究结果表明,收缩徐变的影响不可忽略。Shrinkage and creep are inherent time-dependent characteristics of concrete, and they will cause the cable forces and girder elevation varying with time. The internal forces and deflections of cable-stayed bridges, a kind of highly indeterminate structure, are easily affected by the concrete shrinkage and creep. In the paper, in order to study on the influence on the cable forces and girder elevation by shrinkage and creep, a one-side cable-stayed bridge with two lowers is used as an example to illustrate the influence on the internal force and deflection by shrinkage and creep based on theoritical analysis and measurement in a construction stage. Results show that the infulence of shrinkage and creep cannot be ignored.

关 键 词：收缩徐变 混凝土斜拉桥 拉索索力 主梁标高 

分 类 号：TU974[建筑科学—建筑技术科学]