Spalling | An-Najah Staff

A Numerical Model for Predicting the Fire Resistance of Reinforced Concrete Beams

Sun, 2014-06-01 12:41 — Monther Dwaikat

Journal Title, Volume, Page:

Cement and Concrete Composites Volume 30, Issue 5, Pages 431–443

Year of Publication:

2008

Link:

http://www.sciencedirect.com/science/article/pii/S095894650700145X

Authors:

M. Dwaikat

Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, United States

Current Affiliation:

Building Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

V.K.R. Kodur

Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, United States

Preferred Abstract (Original):

A numerical model, in the form of a computer program, for tracing the behavior of reinforced concrete (RC) beams exposed to fire is presented. The three stages associated with the numerical procedure for evaluating fire resistance of RC beams; namely, fire temperature calculation, thermal analysis and strength analysis, are explained. A simplified approach to account for spalling under fire conditions is incorporated into the model. The use of the computer program for tracing the response of RC beams from the initial pre-loading stage to collapse stage, due to the combined effect of fire and loading, is demonstrated. The validity of the numerical model is established by comparing the predictions from the computer program with results from full-scale fire resistance tests. Through the results of numerical study, it is shown that the type of failure criterion has significant influence on predicting the fire resistance of RC beams.

A Numerical Approach for Modeling the Fire Induced Restraint Effects in Reinforced Concrete Beams

Sun, 2014-06-01 10:46 — Monther Dwaikat

Journal Title, Volume, Page:

Fire Safety Journal Volume 43, Issue 4, Pages 291–307

Year of Publication:

2008

Link:

http://www.sciencedirect.com/science/article/pii/S0379711207000938

Authors:

M.B. Dwaikat

Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, USA

Current Affiliation:

Building Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

V.K.R. Kodur

Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, USA

Preferred Abstract (Original):

In this paper, a model to predict the influence of fire induced restraints on the fire resistance of reinforced concrete (RC) beams is presented. The three stages, associated with the fire growth, thermal and structural analysis, for the calculation of fire resistance of the RC beams are explained. A simplified approach to account for spalling under fire conditions is incorporated into the model. The validity of the numerical model is established by comparing the predictions from the computer program with results from full-scale fire resistance tests. The program is used to conduct two case studies to investigate the influence of both the rotational and the axial restraint on the fire response of the RC beams. Through these case studies, it is shown that the restraint, both rotational and axial, has significant influence on the fire resistance of the RC beams.

Macroscopic FE Model for Tracing the Fire Response of Reinforced Concrete Structures

Sun, 2014-06-01 09:31 — Monther Dwaikat

Journal Title, Volume, Page:

Engineering Structures Volume 31, Issue 10, Pages 2368–2379

Year of Publication:

2009

Link:

http://www.sciencedirect.com/science/article/pii/S014102960900203X

Authors:

Monther Dwaikat

Department of Civil & Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, United States

Current Affiliation:

Building Engineering Department, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Venkatesh Kodur

Department of Civil & Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, United States

Nikhil Raut

Department of Civil & Environmental Engineering, Michigan State University, East Lansing, MI 48824-1126, United States

Preferred Abstract (Original):

A macroscopic finite element model for tracing the fire response of reinforced concrete (RC) structural members is presented. The model accounts for critical factors that are to be considered for performance-based fire resistance assessment of RC structural members. Fire induced spalling, various strain components, high temperature material properties, restraint effects, different fire scenarios and failure criteria are incorporated in the model. The validity of the numerical model is established by comparing the predictions from the computer program with results from full-scale fire resistance tests. Case studies are conducted to demonstrate the use of the computer program for tracing the response of RC members under standard and design fire exposures. Through the results of the case studies, it is shown that the fire scenario has a significant effect on the fire resistance of RC columns and beams. It is also shown that macroscopic finite element models are capable of predicting the fire response of RC structural members with an adequate accuracy for practical applications.