SHRINKAGE STRESS ANALYSIS OF CONCRETE SLAB IN MULTISTOREY BUILDING CONSIDERING VARIATION OF RESTRAINT AND STRESS RELAXATION DUE TO CREEP

摘要

The purpose of this paper is to propose a practical shrinkage stress analysis method of concrete slab in a multistorey building considering creep relaxation and construction sequence for the quantitative evaluation of shrinkage effect. Shrinkage strains are converted into initial strain loads or equivalent temperature loads. Axial stresses due to shrinkage are calculated using elastic analysis, which is the summation of step-by-step analysis results according to the construction sequence. Stress relaxation of creep is considered by multiplying the relaxation coefficient to the calculated elastic shrinkage stresses. An example of 10-storey building is presented to explain the analysis procedure and applicability.