先张法预应力混凝土梁钢绞线预应力传递长度的试验研究

Experimental Study on the Transfer Length of Prestressing Strands In Pretension of Concrete Beams

通过试验量测先张法混凝土梁构件切断钢绞线的端部区域内混凝土压应变值,分析了预应力传递长度范围内混凝土压应变(应力)的变化规律,验证了现行《混凝土结构设计规范》GB50010-2002和《公路钢筋混凝土及预应力混凝土桥涵设计规范》JTG D62-2004规定的预应力传递长度计算方法,并证明了现行规范所建议的在预应力传递长度范围内的混凝土压应力分布能够适用于先张预应力筋构件。

The compressive strains of concrete in the end area of pretensioned concrete beams are measured, the variation of compressive strains（stresses） of concrete in the transfer length scope is analyzed and the calculation methods of the transfer length in the codes are proved. In addition, the distributions of compressive strains of concrete in the transfer length, which are based on ＂Code for Design of Concrete Structures＂（GB50010-2002） and ＂Design Specifications for Reinforced Concrete and Prestressed Concrete Bridge-Culverts＂（ JTG D62-2004）, are applicable for Pretensioned Concrete Beams.