Deflection Analysis of Externally Prestressed Concrete Beam Based on Damage Mechanics

This article describes the static experiment of externally prestressed concrete beam under the beeline reinforcing patterns. It adopts the damage mechanics - superimposed load - finite element method, uses damage constitutive equation to replace the constitutive equation, which does not take the damage into account, self-compiled eight-node uniform-parameter element superimposed load finite element program is used to analyze the forced distortion of experimental beam. The value analysis results show: the damage mechanics can soundly reflect the complicated behaviors of concrete materials in the load-superimposing process and has obtained the values of the concrete material damage characteristic parameters and achieved the results that are consistent with the experiment. Therefore, damage mechanics has provided a new way in studying the nonlinear behaviors of concrete materials.