LONG-TERM FINITE ELEMENT ANALYSIS OF DEFORMATION BEHAVIOR CAUSED BY DRYING SHRINKAGE IN FRAME MODELS ASSUNMING A RIGID-FRAME STRUCTURES

Abstract

In reinforced concrete structures, drying shrinkage strain and creep deformation occur continuously over a long period of time. When concrete members are anchored to other structural members, stresses are generated and cracks may occur, adversely affecting the serviceability and durability of the structure. In this study, some examples of continuous frame models assuming reinforced concrete rigid-frame structures were created, and elastoplastic analyses were conducted over a long period of time by applying drying shrinkage strain and applying the FEM analysis software that simulates creep analysis to evaluate the damage that occurs in the entire structures, and to evaluate the damage that occurs in the entire structures. The objective of the study was to evaluate the extent of the restraining spring against the tensile axial force of the beams proposed in previous research. The following results were obtained.

The frames model exhibited shear-lag deformation behavior due to drying shrinkage, resulting in tensile axial forces in the beams at the first level and shear forces in the columns at the ends of the structure. Shear failures occurred when drying shrinkage were applied, and fractural cracks occurred at both ends of the beams when large bending moments were applied to the beams.

The degrees of the restraining spring for the axial force acting on the beam in the first layer section were distributed according to the shear-lag deformation and were not significantly affected by the number of layers in the model.