无粘结部分预应力砼梁受弯承载力计算  

Calculation of Flexural Capacity of Unbonded Partially Prestressed Concrete Beams

作　　者：刘健行[1] 

机构地区：[1]湖南大学

出　　处：《建筑结构学报》1992年第6期30-40,共11页Journal of Building Structures

摘　　要：本文提出了一种直接确定砼受压区高度以计算无粘结部分预应力砼梁受弯承载力的新方法。根据对国内外59根试验梁试验结果的分析,发现破坏截面相对受压区高度ξ_p与综合配筋指标q_0之间存在良好的线性关系,从而建立了ξ_p的简便计算公式。根据这一公式,还可导出无粘结筋极限应力计算公式。这些公式的计算结果与试验结果符合良好。In this paper a new method for calculating the flcxural capacity of unbonded partially prestressed concrete beams is proposed. In this method the relative depth of the compressive concrete zone in the failure section can be estimated directly. Based on the analysis of the experimental results of 59 beams, it is found that there is an obvious linear-relationship between the relative depth of the compression zone and the composite reinforcement index. Then a simple formula for estimating the relative depth of the compression zone is established. Based on this formula, a formula for estimsting the ultimate stress in unbonded tendons is derived as well. The results obtained by the given formulae agree well with the experimental results.

关 键 词：预应力混凝土 梁 承载力 无粘结 

分 类 号：TU378.102[建筑科学—结构工程]