【摘要】 通过 6块无粘结预应力双向板试验 ,研究了影响双向板变形的主要因素 :结构形式、预应力筋配筋率 .将边梁对简支板跨中最大挠度的影响转化为荷载与支座条件系数来考虑 ;对两个方向的预应力筋和非预应力筋对简支板跨中最大挠度的影响 ,用换算配筋率 (αpρ)参数来反映 ,建立了无粘结预应力简支板短期刚度和变形计算公式 .计算结果与试验结果吻合较好 .更多还原

【Abstract】 Based on the experimental results of 6 unbonded prestressed dual concrete slabs, the effects of structural forms, prestressed reinforcement ratio upon the prestress increment and the ultimate strength capacity are studied. The effects of surrounding beams upon the maximum deflection in the mid span of simply supported concrete slabs are considered with loading and the supporting condition factors. The effects of prestressed and nonprestressed reinforcement in two directions upon the maximum deflection in the mid span of simply supported concrete slabs are reflected with the ratio of the conversion reinforcement ratio. The stiffness formula of unbonded prestressed simply supported concrete slabs is formed. The experimental results agree well with the calculated results.更多还原