无粘结预应力筋极限应力研究

Research on Ultimate Stress of Unbonded Prestressed Steel

对竖向和水平荷载试验中 1 9榀 UPC框架梁中 UPS的应力变化与极限应力进行探讨 ,并结合预应力混凝土结构非线性分析模型 ,定性定量分析了结构中 UPS极限应力的主要影响因素 ,如荷载形式、配箍率、综合配筋力比和跨高比 ,并提出 UPS极限应力计算的修正公式 ,更适合于

The stress variation and ultimate stress of UPS in 19 UPC frames under vertical or horizontal cyclic loadings has been discussed.The principal factors affecting ultimate stress of UPS such as types of loading,transverse steel ratio of existing hoops,composite reinforced force ratio,span-high ratio have been analyzed in both qualitative and quantitative way based on the test results combined with nonlinear analyzing model of prestressed concrete structures.A modified formula used to calculate the ultimate stress of UPS,has also been proposed,which is more applicable to regions of earthquake.