Keywords: time-dependent, creep, shrinkage, tension stiffening, finite element analysis, two-way slab.

Recently proposed creep and shrinkage models are implemented along with tension stiffening models in a general purpose computer program for analysis of reinforced concrete structures under sustained time-dependent loading. The effect of creep and shrinkage on tension stiffening is evaluated. The proposed modelling procedures are evaluated by comparison with test results of specimens subjected to sustained loading. Effects of in-plane shrinkage restraint on overall behaviour of slab systems are also evaluated.

The performance of reinforced concrete structures at service load levels is often heavily dependent on cracking and tension stiffening as well as time-dependent effects of creep and shrinkage. This paper presents a computational model that incorporates these material characteristics for the analysis of uniaxial and flexural members. The models, based on orthotropic material behaviour, are incorporated in the general purpose computer programme ABAQUS [1] through user-defined subroutines. Results based on the analytical model are compared with available experimental data.

A computational model based on implementation of a user subroutine in ABAQUS has been presented that accounts for time-dependent behaviour in reinforced concrete after initial cracking. The model accounts for creep and shrinkage effects as well as cumulative damage in the tension zone under sustained loading. The model has been verified based on comparisons with available experimental data. Work is continuing to apply the model to two-way slab systems under time-dependent loading.

1

HKS, ABAQUS/Standard User's Manual Version 6.3. Pawtucket, RI: ABAQUS, 2002.

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £75 +P&P)