scholarly journals DEVELOPMENNT OF A COMPOSITE SLAB BREAK-ELEMENT FOR THE ANALYSIS OF COMPOSITE FRAMES IN FIRE

2016 ◽  
Author(s):  
Mohammadali Javaheriafif ◽  
Buick Davison ◽  
Ian Burgess
Keyword(s):  
Theoretical Model ◽  
Large Deflection ◽  
Line Element ◽  
Crack Development ◽  
Fe Modelling ◽  
Local Behaviour ◽  
Composite Slab ◽  
Global Behaviour ◽  
Composite Frames ◽  
In Fire

This research is intended to predict the inevitable through-depth crack development in a composite slab, across its area and in particular around its edges at large deflection. Based on previous work, a theoretical model has been proposed to simulate the local behaviour of slab beyond initial cracking. The model has been successfully implemented in the software VULCAN as a new line element. Comparisons between the existing theoretical model and FE modelling have shown that the proposed element provides a sufficient level of accuracy beyond initial cracking. However, further improvement is needed to enable a precise investigation of the local and global behaviour of composite slab systems, and the influence of through-depth cracking on the slab’s performance.

Three-dimensional modelling of composite frames with ductile connections in fire

Structures ◽  
2022 ◽  
Vol 36 ◽  
pp. 665-677
Author(s):  
Yu Liu ◽  
Shan-Shan Huang ◽  
Ian Burgess
Keyword(s):  
Three Dimensional ◽  
Composite Frames ◽  
In Fire

scholarly journals A Study on the Effect of O2 Diffusion on the Retention Time of Inert Agents

2020 ◽  
Vol 10 (19) ◽  
pp. 6694
Author(s):  
GoonHo Kim ◽  
Ju-Hong Cha ◽  
Jee-Hun Jeong ◽  
Ho-Jun Lee
Keyword(s):  
Theoretical Model ◽  
Retention Time ◽  
Hold Time ◽  
Theoretical Models ◽  
Accurate Model ◽  
Fire Extinguishing ◽  
A Value ◽  
O2 Diffusion ◽  
In Fire ◽  
And Diffusion

Gaseous agents are widely used in fire extinguishing systems (FESs) when water extinguishing agents are unavailable. The extinguishing ability of the FES-gaseous agent is determined by the retention time (hold time) at which its concentration is maintained. In particular, the retention time of the inert agent is determined by the O2 inflow from the outside. However, current theoretical models for inert agents do not provide an accurate model for the diffusion of incoming O2. Specifically, because the theoretical equations do not include O2 diffusion or include too large a value, there is a large difference between the measured and theoretical retention times. Therefore, in this study, accurate O2 diffusion was verified through experimental and numerical analyses using three types of deactivators and reflected in the existing theoretical model. O2 diffusion was analyzed through the interface slope α and diffusion velocity vd. As a result, this proposed method can predict the retention time more accurately than existing theoretical models.

scholarly journals Collapse Mechanisms of Composite Slab Panels in Fire

2011 ◽  
Vol 2 (3) ◽  
pp. 205-216 ◽  
Author(s):  
Anthony Abu ◽  
Verotiana Ramanitrarivo ◽  
Ian Burgess
Keyword(s):  
Composite Slab ◽  
Collapse Mechanisms ◽  
In Fire

scholarly journals Model Parameter Sensitivity for Structural Analysis of Composite Slab Structures in Fire

2021 ◽  
Vol 12 (2) ◽  
pp. 339
Author(s):  
Riza Suwondo ◽  
Lee Cunningham ◽  
Martin Gillie ◽  
Made Suangga ◽  
Irpan Hidayat
Keyword(s):  
Structural Analysis ◽  
Parameter Sensitivity ◽  
Composite Slab ◽  
Model Parameter ◽  
In Fire

scholarly journals REINFORCED AND PRESTRESSED CONCRETE HOLLOW BEAMS UNDER TORSION

2014 ◽  
Vol 19 (Supplement_1) ◽  
pp. S141-S152 ◽  
Author(s):  
Luis F. A. Bernardo ◽  
Jorge M. A. Andrade ◽  
Luiz A. Pereira-De-Oliveira
Keyword(s):  
Theoretical Model ◽  
Prestressed Concrete ◽  
Experimental Results ◽  
Membrane Model ◽  
Global Behaviour ◽  
Theoretical Predictions ◽  
Hollow Beams

Recently a new rational theoretical model for beams under torsion has been proposed. This model, called Softened Membrane Model for Torsion (SMMT), is able to predict well the global behaviour of reinforced and prestressed concrete solid beams under torsion. This paper presents a study in order to check the SMMT for reinforced and prestressed concrete hollow beams under torsion. Theoretical predictions from SMMT are compared to some experimental results of hollow beams available in the literature and also with the predictions of another theoretical model previously proposed from the authors. It is shown that SMMT, with some corrections, is able to predict satisfactorily the overall behaviour of reinforced and prestressed concrete hollow beams under torsion.

scholarly journals A New Approach in Analysing the Three-dimensional Behaviour of a Composite Plate

1993 ◽  
Vol 2 (4) ◽  
pp. 096369359300200
Author(s):  
J. Isometsä ◽  
S-G. Sjölind ◽  
A. Pramila
Keyword(s):  
Composite Plate ◽  
Three Dimensional ◽  
Solid Model ◽  
Local Behaviour ◽  
New Approach ◽  
Typical Element ◽  
Constraint Equations ◽  
Global Behaviour ◽  
Plate Elements ◽  
D Model

The bending of a thick composite plate is studied by using a 2-d plate element with a stiffness matrix derived by a 3-d solid model for a typical element. Constraint equations are used to ensure full displacement continuity between adjacent plate elements. After solving the global behaviour by 2-d elements the local behaviour is studied by using the 3-d model of the typical element. The approach is verified by comparing the full 3-d stress state obtained with an available analytical solution.

The Large Deflection of the Orthotropic and Rectangular Membrane under the External Distributed Load

2012 ◽  
Vol 166-169 ◽  
pp. 725-729 ◽  
Author(s):  
Long Jun ◽  
Zheng Zhoulian ◽  
Liu Changjiang ◽  
Song Weiju ◽  
Yin Hui Zhang ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Perturbation Method ◽  
External Load ◽  
Large Deflection ◽  
Maximum Deflection ◽  
Distributed Load ◽  
Small Deflection

This paper reviews research on the large deflection of the orthotropic and rectangular membrane under the distributed load. Through building the theoretical model of the orthotropic and rectangular membrane under the distributed load, the authors deduce the equations set of the membrane which has the effect of pretension and solve the equations set with the perturbation method. The authors obtain the relational expression between the maximum deflection of the membrane’s centre point and the external load, then make a comparison between the large deflection and the small deflection. At last, With the example, the authors analyze the change of the deflection of the centre point of the membrane along the external load, and the length of the side, and the large or small of the pretension and other parameter.

A theoretical model of the process of fatigue crack development

1977 ◽  
Vol 9 (4) ◽  
pp. 400-403
Author(s):  
N. M. Borodachev ◽  
M. P. Zhdanovich ◽  
N. I. Savchenko
Keyword(s):  
Fatigue Crack ◽  
Theoretical Model ◽  
Crack Development ◽  
Fatigue Crack Development
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