The Effects of Geometric Nonlinearity on Elasto-Plastic Analysis of Plane Steel Frames in Fire

2012 ◽  
Vol 446-449 ◽  
pp. 3513-3516
Author(s):  
Bing Xia ◽  
Yu Ching Wu
Keyword(s):  
Geometric Nonlinearity ◽  
Steel Frames ◽  
Plastic Analysis ◽  
In Fire

The Effects of Geometric Nonlinearity on Elasto-Plastic Analysis of Plane Steel Frames in Fire

2012 ◽  
Vol 446-449 ◽  
pp. 3513-3516
Author(s):  
Bing Xia ◽  
Yu Ching Wu
Keyword(s):  
Finite Element ◽  
Geometric Nonlinearity ◽  
Elevated Temperatures ◽  
Steel Frames ◽  
External Loading ◽  
Element Analysis ◽  
Stiffness Matrices ◽  
Plastic Analysis ◽  
In Fire ◽  
Incremental Step

In this paper, the co-rotational total Lagrangian forms of finite element formulations are derived to make elasto-plastic analysis for plane steel frames either under increasing external loading at ambient temperature or under constant external loading at elevated temperatures. Geometric nonlinearity and thermal-expansion effect are taken into account. A series of programs are developed based on the formulations. To verify the accuracy and efficiency of the nonlinear finite element programs, a couple of numerical benchmark tests are carried out. And the results are in a good agreement with solutions from literature. The effects of nonlinear terms of the stiffness matrices on the computational results are investigated in detail. It is demonstrated that the influence of geometric nonlinearity on the incremental step by step finite element analysis for plane steel frames in fire is limited.

Visco-Elasto-Plastic Analysis of Steel Frames in Fire

2002 ◽  
Vol 128 (1) ◽  
pp. 105-114 ◽  
Author(s):  
K. H. Tan ◽  
S. K. Ting ◽  
Z. F. Huang
Keyword(s):  
Steel Frames ◽  
Plastic Analysis ◽  
In Fire

Creep of the Plane Steel Frame at Elevated Temperature

2012 ◽  
Vol 446-449 ◽  
pp. 793-796
Author(s):  
Hui Zhu ◽  
Yu Ching Wu
Keyword(s):  
Numerical Model ◽  
Significant Contribution ◽  
Geometrical Nonlinearity ◽  
Steel Frames ◽  
Steel Structures ◽  
Element Formulation ◽  
Numerical Examples ◽  
Lagrangian Finite Element ◽  
In Fire ◽  
Plane Steel Frame

In this paper, co-rotational total Lagrangian finite element formulation is derived, and the corresponding numerical model is developed to study creeping behavior of plane steel frames in fire. Geometrical nonlinearity, material nonlinearity, high temperature creeping, and temperature rising rate are taken into account. To verify accuracy and efficiency of the numerical model, four prototypical numerical examples are analyzed using this model. Results are in a great agreement with solutions in literatures. Then the numerical model is used to analyze creeping behavior of the plane steel frames when temperature is lowering. The numerical results have significant contribution to resistance and protection for steel structures against disastrous fires.

Behaviour of steel frames under fire conditions

1999 ◽  
Vol 26 (2) ◽  
pp. 156-167 ◽  
Author(s):  
D I Nwosu ◽  
VKR Kodur
Keyword(s):  
Fire Resistance ◽  
Steel Frames ◽  
Load Ratio ◽  
Steel Structures ◽  
Point Of View ◽  
Frame Structures ◽  
Structural Behaviour ◽  
Analysis And Design ◽  
In Fire ◽  
Fire Conditions

A state-of-the-art review of the behaviour of steel frame structures in fire is presented. Results from different studies indicate that the behaviour of a complete structure is different from that of a single structural member under fire conditions from the point of view of fire resistance. Earlier studies also show that analysis and design of steel structures against fire based on their overall behaviour could lead to a reduction or the elimination of applied fire protection to certain structural members. The effects of continuity, restraint conditions, and load ratio on the fire resistance of frame structures are discussed. The beneficial aspects derived from considering overall structural rather than single-member behaviour in fire are illustrated through the analysis on two one-bay, one-storey, unprotected steel portal frames, a column, and a beam. Also comparison is made between the performance of a beam with different end restraints in fire. Results from the analyses indicate that the fire resistance of a member is increased when it is considered as part of a structure compared with when it is considered as a single member.Key words: steel, frames, fire resistance, buckling, loads, overall structural behaviour.

Principles of a component-based connection element for the analysis of steel frames in fire

2013 ◽  
Vol 49 ◽  
pp. 1059-1067 ◽  
Author(s):  
F.M. Block ◽  
J.B. Davison ◽  
I.W. Burgess ◽  
R.J. Plank
Keyword(s):  
Steel Frames ◽  
In Fire
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