预应力活性粉末混凝土简支梁挠度试验分析  

Bending experimental analysis of unbounded prestressed reactive powder concrete beam

作　　者：曹霞[1] 鲁胜虎[1] 钟翔 

机构地区：[1]桂林理工大学广西建筑工程检测与试验重点实验室,广西桂林541004 [2]广西建筑科学研究设计院,广西南宁530005

出　　处：《混凝土》2012年第12期17-20,共4页Concrete

基　　金：广西建筑工程检测与试验重点实验室资助课题(11-cx-04);研究生创新项目(2011105960814M11);科技攻关项目(桂科攻0995004)

摘　　要：将活性粉末混凝土应用于无黏结预应力结构中,由于其超高的强度使得结构或构件的截面可以进一步减小,而构件的刚度能得到很好的保证;通过8根无黏结预应力活性粉末混凝土简支梁的试验,针对不同非预应力钢筋配筋情况下简支梁张拉阶段的反拱和加载阶段的挠度进行研究,通过对比构件挠度及反拱的试验值和计算值得出无黏结预应力活性粉末混凝土简支梁开裂前的刚度与普通混凝土的取值相同为0.85EI;钢纤维活性粉末混凝土相比一般混凝土提高了梁的整体刚度;预压区非预应力钢筋配筋提高,梁在张拉阶段的反拱值降低;提高受压区非预应力钢筋配筋率能有效约束裂缝的发展,降低梁在加载阶段的挠度。The reactive powder concrete used in unbonded prestressing structure, because of its ultra high strength made structure or the compo- nent of structures could be further reduced, and the stiffnesss of component could be guaranteed.It was about 8 unbounded prestressed reactive powder concrete beams＇ test, according to different amount of reinforcement of prestressed reinforced beam ,research the arch of tension stage and the deflection of loading stage, by comparing the calculated values and experimental values of the component deflection and the arch concluded that the stiffness of prestressed concrete beam reactive powder concrete before cracking was 0.85E1 as ordinary concrete beam, compared with normal concrete,steel fiber concrete reactive powder concrete improve the overall rigidity of beams,increasing the steel reinforcement of bridge bottom contributes to reduce the arch value of beam in the tension stage; improve the steel reinforcement ratio of beam top, could be effectively constraint the cracks development, and reduce the deflection of the beam in the loading stage.

关 键 词：无黏结预应力 活性粉末混凝土 挠度 试验分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]