Time-dependent Effects in Slender Concrete Columns
The Effects of Creep, Shrinkage and Strength Increase in the Analysis and Design of Columns and Other Slender Concrete Compression Members
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The practical design of slender concrete compression members is ususally based on simplified calculation methods. The methods given in e.g. Eurocode 2 (2004) and FIP recommendations (1999) are based on extensive calibrations against accurate second order non-linear analysis. In this analysis, however, the time-dependent effects in concrete were taken into account in a simplified way. Thus, creep was modelled with an extended stress-strain curve for the concrete, whereas shrinkage and strength increase were ignored. In this book the significance of the mentioned simplifications is studied by sy...
The practical design of slender concrete compression
members is ususally based on
simplified calculation methods. The methods given in
e.g. Eurocode 2 (2004) and FIP recommendations
(1999) are based on extensive calibrations
against accurate second order non-linear analysis.
In this analysis, however, the time-dependent
effects in concrete were taken into account in
a simplified way. Thus, creep was modelled with
an extended stress-strain curve for the concrete,
whereas shrinkage and strength increase were
ignored. In this book the significance of the
mentioned simplifications is studied by systematic
comparisons with a more accurate analysis, where the
time-dependent effects are taken into account
in a more fundamental way. The accurate analysis is
also used for comparisons with the results of a
large number of tests on slender concrete columns.
The conclusions are that the simplified way of
taking account of the time depend effects is
sufficiently accurate as a basis for simplified
design methods, and that the accurate analysis -
using material models from MC90 and Eurocode 2 -
generally gives good agreement with the test results.
members is ususally based on
simplified calculation methods. The methods given in
e.g. Eurocode 2 (2004) and FIP recommendations
(1999) are based on extensive calibrations
against accurate second order non-linear analysis.
In this analysis, however, the time-dependent
effects in concrete were taken into account in
a simplified way. Thus, creep was modelled with
an extended stress-strain curve for the concrete,
whereas shrinkage and strength increase were
ignored. In this book the significance of the
mentioned simplifications is studied by systematic
comparisons with a more accurate analysis, where the
time-dependent effects are taken into account
in a more fundamental way. The accurate analysis is
also used for comparisons with the results of a
large number of tests on slender concrete columns.
The conclusions are that the simplified way of
taking account of the time depend effects is
sufficiently accurate as a basis for simplified
design methods, and that the accurate analysis -
using material models from MC90 and Eurocode 2 -
generally gives good agreement with the test results.
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