Analysts of Partially Prestressed Composite Beams

Abstract

Based on equilibrium and compatibility, a general analysis procedure is developed for cracked prestressed and partially prestressed concrete composite sections in the elastic range of behavior. Direct equations are derived for the strains and stresses in the constituent materials taking into account the change in prestressing force, due to the application of loads. Solutions for the special cases of uncracked composite sections, cracked and uncracked noncomposite sections as well as expressions for the cracking and decompression moments are also presented. A parametric analysis is conducted to study the effects of various parameters on the stresses and stress ranges in the constituent materials. An example is developed to illustrate the application of the method.