chapter  4
46 Pages

Time-dependent internal forces in uncracked structures: analysis by the force method

Consider the effect of creep on a statically indeterminate structure made up of concrete as a homogeneous material, neglecting the presence of reinforcement. A sustained load of given magnitude produces strains and displacements that increase with time, but this is not accompanied by any change in the internal forces or in the reactions at the supports. Creep effect on displacements in such a case can be accounted for simply by using - for the modulus of elasticity of the material - a reduced value equal to E/(1 + p); where p is the creep coefficient.