Research On Computation Theory Based On Nonlinear Reinforced Concrete

The traditional method of analysis of RC structure is based on experiental formula which are concluded from large number of experiments. With that experimential formula,many complex factors are ignored. The domain of RC structure is evidently enlarging in recent years,so more precise analyses are needed for engineering practice. This paper thoroughly explains the constitutive equations and failure criteria under multiaxial stress state. Models and methods fo the nonlinear analysis are introduced in this paper also. And it studies the non-linear proterties of concrete,based on material non-linearity,sets up a non-linear constructive model of RC,following the pre-researches. The program of finite Fortran is worked our. The program is proved to be correct and feasible, as can be referred in the practical design. The following are primary contents and results of the paper.1. Having studied strength and deformation of concrete, kinds of constructive models presented by former scholars, a non-linear constructive model of concrete is established, based on three aspects of strength failure criterion, non-linear index of stress and stress-strain relationship, Mechanic properties and non-linear characteristic of reinforcement are also studied, and the paper suggests the ideal elasto-plastic constructive relationship.2. Pointing out the current code to calculate load bearing ability is isolated.From the structural mechanism , The current calculation mode is not continuous from axis compressive member to eccentrically compressive member.3. Based on mechanical conception,this paper integrates the calculating fomula about bearing pressure of the normal section of the eccentric member,axis memberand flesural member of the reinforced concrete,aiming at searching the newcalculating method of stress and strength.