加载方式改变对高强度桥用混凝土变形特性影响的试验研究  

Deformation of Pre-stressed High-strength Concrete Bridge under Different Loading Ways

作　　者：陈灿明[1,2] 黄卫兰[1,2] 王宏[1,2] 唐崇钊[1,2] 

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]水利部水科学与水工程重点实验室,江苏南京210029

出　　处：《公路工程》2011年第1期20-24,共5页Highway Engineering

基　　金：交通部西部交通建设科技项目(200631822327)

摘　　要：论述大跨径预应力高强度混凝土梁桥施工时仿预应力筋张拉(加载)对瞬时变形和徐变影响的试验结果,文中列述了试验方法、材料、测试结果与成果应用;分析指出,与试验室标准加载方式相比,预应力筋现场施工可以使混凝土的弹性模量明显改变、徐变增加,在计算高强预应力混凝土梁桥的长期变形和构件预应力衰减时应考虑应力历史对变形参数的影响,并进行必要的调整。Instantaneous deformation and creep as well as the influencing factors during the construction of high-strength concrete long-span pre-stressed girder bridge are discussed in this paper.It sets out the test methods,material,test results and outcomes application.Compared with the laboratory standard loading,on-site construction the elastic modulus of concrete changes obviously and creep increases distinctly.It is pointed out that when long-term deformation and pre-stress losses are estimated,stress history has to be considered.Therefore the deformation parameters should be made necessary adjustments.

关 键 词：加载方式 瞬时变形 徐变 预应力损失 高强混凝土 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]