【摘要】 分析了影响无粘结部分预应力混凝土 ( UPPC)梁桥无粘结预应力筋极限应力的主要因素 ,并简要评述了国内外现有的无粘结预应力筋极限应力计算方法与公式。在分析国内外大量试验数据和文献研究的基础上 ,建立了无粘结预应力筋极限应力实用计算方法。通过与试验结果和规范 [1]公式计算值对比分析 ,表明实用计算方法的正确性和可靠性。更多还原

【Abstract】 This paper analyses the main factors which affect the ultimate stress of unbonded tendons in unbonded partially prestressed concrete(UPPC) beam bridges,and simply introduces the various calculating methods and equations of the ultimate stress in unbonded post tensioning.Based on the analysis of the experimental data and the research results reported in references,the practical calculating equation of the ultimate stress in unbonded post tensioning is proposed. Comparision and analysis are made with the experimental results and UPC(JGJ/T 92 93) code equations, which indicates the correction and reliable of the proposed method.更多还原