体外预应力组合梁受弯全过程试验分析  

The Structure Action's Test Analysis of the External Prestressed Composite Steel-concrete Beams

作　　者：张云龙[1,2] 

机构地区：[1]吉林大学交通学院,吉林长春130025 [2]吉林建筑工程学院,吉林长春130021

出　　处：《工程与试验》2008年第4期13-16,共4页Engineering and Test

摘　　要：对计算跨度4.0米的体外预应力组合简支梁进行对称加载弯曲试验,实测了正截面应变分布,剪切滑移效应,体外索的应力增量及混凝土板的剪力滞后情况,并对试验结果进行了分析。分析表明,体外预应力组合梁的截面变形基本符合平截面假定规律,混凝土翼缘板存在的剪力滞现象不可忽视,梁体破坏时体外索的应力增量对结构变形计算的影响很大,分析了施加预应力后,组合梁的塑性性能,断定采用容许应力法进行设计将造成一定的材料浪费。A incurvation test of the external prestressed composite steel-concrete beams is done in order tomeasure the strain＇s distributing of cross section, the increment of the stress in external prestressed tightwire, and the shearing force＇s lag case of T beam＇s flange slab. And compared the test results with the theory analysis results. Its indicates that the deformation of cross section meet the presume of plane section, shearing force＇s lag case of concrete T beam＇s flange slab cannot be ignored. The increment of the stress in external prestressed tightwire has the great influence to the calculation of structure＇s deformation when the beam is destroyed.

关 键 词：组合梁 试验研究 体外预应力 

分 类 号：TU394[建筑科学—结构工程]