A new passive confinement model for the analysis of concrete structures subjected to cyclic and transient dynamic loading

P. Madas, Amr S. Elnashai

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

The paper describes an analytical model for reinforced concrete members subjected to cyclic or transient dynamic loading. Model characterization is given in the context of a pseudo‐spatial description of the stress state. This comprises a procedure for calculating and continuously updating the transverse confinement stress for a given applied axial strain, thus accounting for the passive confinement which an element of concrete is subjected to within a structural member. Comparison with existing uniaxial models shows that the new formulation takes note of previously neglected effects, such as non‐coincident peaks of the steel and concrete stress‐strain curves, and Poisson's ratio variation during loading. Moreover, comparison with 3D concrete constitutive relationships indicates that the level of accuracy is comparable, whilst significant computing time saving is achieved by the new model. Model validation is confirmed by comparison with cyclic loading laboratory test results. Finally, two frames with the same overall strength enhancement factor are analysed under earthquake loading; the difference in the response clearly demonstrates that the model accounts for important behavioural characteristics which are hitherto neglected in comparable existing models.

Original languageEnglish (US)
Pages (from-to)409-431
Number of pages23
JournalEarthquake Engineering & Structural Dynamics
Volume21
Issue number5
DOIs
StatePublished - Jan 1 1992

Fingerprint

concrete structure
Concrete construction
Concretes
Structural members
model validation
Poisson ratio
cyclic loading
reinforced concrete
Reinforced concrete
analysis
Analytical models
Earthquakes
steel
earthquake
Steel
comparison

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

@article{e8af6fb2e1884866b029d76491e06c46,
title = "A new passive confinement model for the analysis of concrete structures subjected to cyclic and transient dynamic loading",
abstract = "The paper describes an analytical model for reinforced concrete members subjected to cyclic or transient dynamic loading. Model characterization is given in the context of a pseudo‐spatial description of the stress state. This comprises a procedure for calculating and continuously updating the transverse confinement stress for a given applied axial strain, thus accounting for the passive confinement which an element of concrete is subjected to within a structural member. Comparison with existing uniaxial models shows that the new formulation takes note of previously neglected effects, such as non‐coincident peaks of the steel and concrete stress‐strain curves, and Poisson's ratio variation during loading. Moreover, comparison with 3D concrete constitutive relationships indicates that the level of accuracy is comparable, whilst significant computing time saving is achieved by the new model. Model validation is confirmed by comparison with cyclic loading laboratory test results. Finally, two frames with the same overall strength enhancement factor are analysed under earthquake loading; the difference in the response clearly demonstrates that the model accounts for important behavioural characteristics which are hitherto neglected in comparable existing models.",
author = "P. Madas and Elnashai, {Amr S.}",
year = "1992",
month = "1",
day = "1",
doi = "10.1002/eqe.4290210503",
language = "English (US)",
volume = "21",
pages = "409--431",
journal = "Earthquake Engineering and Structural Dynamics",
issn = "0098-8847",
publisher = "John Wiley and Sons Ltd",
number = "5",

}

A new passive confinement model for the analysis of concrete structures subjected to cyclic and transient dynamic loading. / Madas, P.; Elnashai, Amr S.

In: Earthquake Engineering & Structural Dynamics, Vol. 21, No. 5, 01.01.1992, p. 409-431.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A new passive confinement model for the analysis of concrete structures subjected to cyclic and transient dynamic loading

AU - Madas, P.

AU - Elnashai, Amr S.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - The paper describes an analytical model for reinforced concrete members subjected to cyclic or transient dynamic loading. Model characterization is given in the context of a pseudo‐spatial description of the stress state. This comprises a procedure for calculating and continuously updating the transverse confinement stress for a given applied axial strain, thus accounting for the passive confinement which an element of concrete is subjected to within a structural member. Comparison with existing uniaxial models shows that the new formulation takes note of previously neglected effects, such as non‐coincident peaks of the steel and concrete stress‐strain curves, and Poisson's ratio variation during loading. Moreover, comparison with 3D concrete constitutive relationships indicates that the level of accuracy is comparable, whilst significant computing time saving is achieved by the new model. Model validation is confirmed by comparison with cyclic loading laboratory test results. Finally, two frames with the same overall strength enhancement factor are analysed under earthquake loading; the difference in the response clearly demonstrates that the model accounts for important behavioural characteristics which are hitherto neglected in comparable existing models.

AB - The paper describes an analytical model for reinforced concrete members subjected to cyclic or transient dynamic loading. Model characterization is given in the context of a pseudo‐spatial description of the stress state. This comprises a procedure for calculating and continuously updating the transverse confinement stress for a given applied axial strain, thus accounting for the passive confinement which an element of concrete is subjected to within a structural member. Comparison with existing uniaxial models shows that the new formulation takes note of previously neglected effects, such as non‐coincident peaks of the steel and concrete stress‐strain curves, and Poisson's ratio variation during loading. Moreover, comparison with 3D concrete constitutive relationships indicates that the level of accuracy is comparable, whilst significant computing time saving is achieved by the new model. Model validation is confirmed by comparison with cyclic loading laboratory test results. Finally, two frames with the same overall strength enhancement factor are analysed under earthquake loading; the difference in the response clearly demonstrates that the model accounts for important behavioural characteristics which are hitherto neglected in comparable existing models.

UR - http://www.scopus.com/inward/record.url?scp=0026869530&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026869530&partnerID=8YFLogxK

U2 - 10.1002/eqe.4290210503

DO - 10.1002/eqe.4290210503

M3 - Article

VL - 21

SP - 409

EP - 431

JO - Earthquake Engineering and Structural Dynamics

JF - Earthquake Engineering and Structural Dynamics

SN - 0098-8847

IS - 5

ER -