Investigation of the performance of a novel ductile connection within bare-steel and composite frames in fire

2020 ◽  
Author(s):  
Yu Liu ◽  
Shan-Shan Huang ◽  
Ian Burgess
Keyword(s):  
Composite Frames ◽  
Bare Steel ◽  
In Fire

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 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.

Spring-stiffness model for flexible end-plate bare-steel joints in fire

2005 ◽  
Vol 61 (12) ◽  
pp. 1672-1691 ◽  
Author(s):  
K.S. Al-Jabri ◽  
I.W. Burgess ◽  
R.J. Plank
Keyword(s):  
Spring Stiffness ◽  
End Plate ◽  
Stiffness Model ◽  
Bare Steel ◽  
In Fire ◽  
Steel Joints

How bracing and heating regimes influence the fire performance of composite frames

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oliver Bahr
Keyword(s):  
Numerical Model ◽  
Shear Failure ◽  
Braced Frames ◽  
Load Bearing ◽  
Content Type ◽  
Standard Fire ◽  
Composite Frames ◽  
Local Stresses ◽  
In Fire ◽  
Fire Design

Purpose Unbraced one-bay composite frames are an interesting load-bearing structure for buildings with up to three storeys. However, their fire design is demanding given the lack of simplified design methods. This paper aims to deepen the understanding of the load-bearing behaviour of both unbraced and braced frames when exposed to fire. Design/methodology/approach In a previous paper, a numerical model for the fire design of these frames was established and validated with good agreement against fire tests. In the current paper, this model was used to compare the typical differences between braced, semi-braced and unbraced composite frames under fire conditions. Further studies addressed the effect of different heating regimes, i.e. partial fire exposure of the columns in the frames and varying location of the ISO standard fire. Findings Numerical investigations showed that it is necessary to take local failure and deformation limits of the fire-exposed frames into account. On this basis, unbraced composite frames can compete with braced frames as they have to endure less thermal restraints than braced frames. Originality/value In contrast to other investigations on frames, the numerical model is able to take into account the shear failure, which is especially important within the frame corners. Using this model, it is shown that limited sway is reasonable to reduce thermal restraints and hence local stresses. In this regard, the concept of semi-rigid composite joints with a distinct amount of reinforcement has proven to be very rational in fire design.

scholarly journals Ductile connection to improve the fire performance of bare-steel and composite frames

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yu Liu ◽  
Shan-Shan Huang ◽  
Ian Burgess
Keyword(s):  
Composite Structures ◽  
Fire Performance ◽  
Axial Deformation ◽  
Content Type ◽  
Fire Engineering ◽  
Axial Forces ◽  
Comparison Results ◽  
Bare Steel ◽  
Pinned Connections ◽  
In Fire

PurposeIn order to improve the robustness of bare-steel and composite structures in fire, a novel axially and rotationally ductile connection has been proposed in this paper.Design/methodology/approachThe component-based models of the bare-steel ductile connection and composite ductile connection have been proposed and incorporated into the software Vulcan to facilitate global frame analysis for performance-based structural fire engineering design. These component-based models are validated against detailed Abaqus FE models and experiments. A series of 2-D bare-steel frame models and 3-D composite frame models with ductile connections, idealised rigid and pinned connections, have been created using Vulcan to compare the fire performance of ductile connection with other connection types in bare-steel and composite structures.FindingsThe comparison results show that the proposed ductile connection can provide excellent ductility to accommodate the axial deformation of connected beam under fire conditions, thus reducing the axial forces generated in the connection and potentially preventing the premature brittle failure of the connection.Originality/valueCompared with conventional connection types, the proposed ductile connection exhibits considerable deformability, and can potentially enhance the robustness of structures in fire.

scholarly journals Numerical comparison between the thermo-structural behavior of steel and partially encased steel and concrete composite columns in fire

2018 ◽  
Vol 11 (4) ◽  
pp. 876-901
Author(s):  
Y. S. SIMÕES ◽  
F. M. ROCHA ◽  
J. MUNAIAR NETO
Keyword(s):  
Fire Resistance ◽  
Numerical Study ◽  
Load Ratio ◽  
Numerical Comparison ◽  
Geometric Imperfection ◽  
Composite Columns ◽  
Variation Of Parameters ◽  
Surrounding Structure ◽  
Bare Steel ◽  
In Fire

Abstract The bare steel structural members have a low fire resistance. However, in steel and concrete composite members, the concrete encasement, besides the contribution to the stiffness of the whole system, reduces the amount of heat that reaches the steel profile, increasing the its fire resistance. The aim of this paper is to conduct a numerical study on the behavior of steel and steel and concrete composite columns in fire, in order to compare their performance based on the variation of parameters such as the stiffness of the surrounding structure, geometric imperfection and load ratio. It has been found that, in general, the intensity of the geometric imperfection and stiffness of the surrounding structure does not affect the fire resistance of steel and composite columns. However, the stiffness of the surrounding structure raised the maximum value of the restraining forces generate throughout the heating. Regarding the load ratio, when increased, the fire resistance and critical temperature decreased.

Temperature analysis of extended end plate joints to square CFST columns in fire

2016 ◽  
Vol 7 (4) ◽  
pp. 306-315
Author(s):  
Jing-feng Wang ◽  
Hai-Tao Wang ◽  
Wei-Wei Shi ◽  
Hong-Yu Sheng
Keyword(s):  
Temperature Distribution ◽  
Test Results ◽  
Content Type ◽  
Composite Frames ◽  
Composite Joint ◽  
Fire Condition ◽  
Temperature Filed ◽  
Cfst Columns ◽  
Rigid Joints ◽  
In Fire

Purpose This paper aims to obtain fire resistance of semi-rigid joints for concrete-filled steel tubular (CFST) composite frames and temperature filed distribution of composite joints in fire. Design/methodology/approach The temperature filed model of semi-rigid joints to CFST columns with slabs was made by using ABAQUS finite element (FE) software, in considering temperature heating-up stage of fire modelling. The effects of composite slab, fire type and construction location were discussed, and the model was verified by the test results. The temperature distribution of composite joint under three-side or four-side fire condition was studied by the sequentially coupled thermal analysis method. The temperature versus time curves and temperature distribution of various construction and location were analyzed. Findings The paper provides FE analysis and numerical simulation on temperature field of semi-rigid joints for CFST composite frames in fire. The effects of composite slab, fire type and construction location were discussed, and the model was verified by the test results. It suggests that the temperature distribution of composite joint in three- or four-side fire condition showed a different development trend. Research limitations/implications Because of the chosen FE analysis approach, the research results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further. Practical implications The research results will become the scientific foundation of mechanical behavior and design method of semi-rigid CFST composite frames in fire. Originality/value This paper fulfils an identified need to study the temperature field distribution of the semi-rigid joints to CFST columns and investigate the mechanical behavior of the semi-rigid CFST joints in fire.

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