INFERENCE OF LOAD-DEFORMATION CHARACTERISTICS FROM PROPOSED MACRO-MODEL FOR CANTILEVER PRECAST PC BEAMS ASSEMBLED BY PRESTRESSING TO COLUMNS WITH ROUND PC TENDON

摘要

The authors propose a method by which to estimate the load-deformation characteristics in the ultimate region of prestressed concrete (PC) beams assembled prestressing with round PC tendons. The conclusions are as described below. 1) Under the assumed appropriate deformation conditions, draw out of the PC tendons is computed on the basis of the bond characteristics of PC tendons, and a macro model which enables rotational deformations to be obtained is proposed. 2) the analysis results thus obtained about load-deformation characteristics of beams are in good agreement with the experimental results, and 3) in the aforesaid load-deformation characteristics, strains at extreme fibers of concrete and depth of neutral axis can be estimated with sufficient accuracy.