CREEP AND FATIGUE ANALYSIS OF REINFORCED CONCRETE STRUCTURES

A computional procedure for the creep and fatigue analysis of reinforced concrete slructures exposed to flexure is presented. The fatigue loading effects are modified into an equivalent creep analysis. The analysis is based on the finite element method employing beam elements. The material behavior of steel, concrete and bond between reinforcement and concrete are descri bed as realisticly as possible. For the reinforcing steel the stress-strain behavior as measured in tests or given in codes is assumed. For the stress-stra in behavior of concrete in compression under static loading. the proposal by Park/Pau ley is taken. The influence of sustained or latigue loading is taken into account by using the isochrone (J-E-relationship valid for t> to or N> 1 respectively; whereby the creep coefficients for both type of loadings are taken from MC90. For sustained and fatigue loading the isochrone bond stress-slip relationship is used. The creep coefficients are taken from MC90. The accuracy 01 the proposed model is checked by comparing the behavior of some test beams under sustained and latigue loading wi th the predictions. Key-words: creep. latigue loading, re inforced concrete. bond, nonlinear,,"alysls