荷载与支座条件对无粘结预应力钢筋极限应力的影响

Effect of Loading Forms and Supporting Conditions on the Ultimate Stress of Unbonded Prestressed Tendons

本文通过单跨梁跨中挠度计算公式中的荷载与支座条件系数,将荷载形式与支座条件对无粘结预应力筋极限应力的影响进行了计算分析。分析结果表明,这一因素对无粘结筋极限应力有较大影响,如在设计中不考虑这一因素,所使用的无粘结筋极限应力计算式的计算精度和适用范围会受到较大影响和限制。

In this paper, the effect of loading forms and supporting types on the ultimate stress of unbonded prestressed tendons is analyzed by using the coefficients of loading and supporting condition in thedeflection formula of onespan beams. Analysis results show that the accuracy and the available range of formulas to calculate the ultimate stress of unbonded prestressed tendons, which are used in practical design now, would be limited without considering those factors.