A STUDY ON THE CALCULATION METHOD FOR FLEXURAL BEHAVIOR OF UNBONDED PRE-STRESSED CONCRETE BEAM

Abstract

 The calculation method for the flexural ultimate strength and moment–rotation angle relationship of pre-stressed concrete beam were developed by theoretical approach.
 The summary of these methods is following;
 1. The flexural ultimate strength is decided by compressive strength of cover or core concrete.
 2. The increase of compressive strength of core concrete by stirrup is considered.
 3. The rotation angle is calculated with considering concrete compressive strain at critical section, tensile strain of tension bar and elastic deflection of beam.
 The calculated results by these methods corresponded well to the previous experimental results.