TY - RPRT
T1 - Composite Analysis of Concrete
T2 - Creep, Relaxation and Eigenstrain/stress
AU - Nielsen, Lauge Fuglsang
N1 - R-13
PY - 1996
Y1 - 1996
N2 - A composite-rheological model of concrete is presented by which
consistent predictions of creep, relaxation, and internal stresses
can be made from known concrete composition, age at loading, and
climatic conditions. No other existing "creep prediction method"
offers these possibilities in one approach.The model is
successfully justified comparing predicted results with recent
experimental data obtained in tests made at the Danish
Technological Institute and at the Technical University of Denmark
on creep, relaxation, and shrinkage of very young concretes
(hours) - and also with experimental results on creep, shrinkage,
and internal stresses caused by drying shrinkage reported in the
literature on the mechanical behavior of mature
concretes.Shrinkage (autogeneous or drying) of mortar and concrete
and associated internal stress states are examples of analysis
made in this report. In this context is discussed that concrete
strength is not an invariable material property. Based on the
overall positive results reported it is suggested that creep
functions needed in Finite Element Analysis (FEM-analysis) of
structures can be established from computer-simulated experiments
based on the model presented - calibrated by only a few real
experiments.
AB - A composite-rheological model of concrete is presented by which
consistent predictions of creep, relaxation, and internal stresses
can be made from known concrete composition, age at loading, and
climatic conditions. No other existing "creep prediction method"
offers these possibilities in one approach.The model is
successfully justified comparing predicted results with recent
experimental data obtained in tests made at the Danish
Technological Institute and at the Technical University of Denmark
on creep, relaxation, and shrinkage of very young concretes
(hours) - and also with experimental results on creep, shrinkage,
and internal stresses caused by drying shrinkage reported in the
literature on the mechanical behavior of mature
concretes.Shrinkage (autogeneous or drying) of mortar and concrete
and associated internal stress states are examples of analysis
made in this report. In this context is discussed that concrete
strength is not an invariable material property. Based on the
overall positive results reported it is suggested that creep
functions needed in Finite Element Analysis (FEM-analysis) of
structures can be established from computer-simulated experiments
based on the model presented - calibrated by only a few real
experiments.
M3 - Report
SN - 87-7740-194-8
T3 - Danmarks Tekniske Universitet. Institut for Baerende Konstruktioner og Materiale. Serie R
BT - Composite Analysis of Concrete
PB - Technical University of Denmark, Department of Civil Engineering
ER -