部分预应力高强混凝土梁无粘结筋极限应力及承载力的计算方法  

The calculating method on partially prestressed high strength concrete beam of unbonded ultimate reinforcement and section strength

作　　者：宋永发[1] 王清湘[1] 赵国藩[1] 宋玉普[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023

出　　处：《中国公路学报》2000年第1期61-64,共4页China Journal of Highway and Transport

摘　　要：通过 1 5根单调荷载和 1 1根低周重复荷载作用下的无粘结部分预应力高强混凝土梁的试验研究 ,探讨了综合配筋指标、跨高比、荷载作用方式对预应力筋应力增量和极限承载力的影响 ,建立了无粘结预应力筋应力增量与综合配筋指标、混凝土相对受压区高度与综合配筋指标的关系式 ,对受压区混凝土应力等效模式进行了探讨 ,给出了两种无粘结部分预应力高强混凝土梁正截面极限承载力的计算公式 ,计算结果与试验结果吻合较好。Based on the experimental results of 26 unbonded partially prestressed concrete (PPC) beams with high strength concrete under monotonic and low cycle loading respectively,the effects of composite reinforement index,ratio of beam span to depth and types of loading upon the prestress increment and the ultimate strength capacity are studied,the relations of the unbonded prestreess increment to composite reinforcement index and relative compression zone depth are established,the equivalent mode of stress in concrete compression zone is discussed,two types of formulae to calculate normal section strength of unbonded PPC beams with high strength concrete are given.The calculating results agree well with the experimental results.

关 键 词：高强混凝土梁 预应力 承载力 无粘结筋 极限应力 

分 类 号：U448.351.2[建筑科学—桥梁与隧道工程]