Finite element analysis of creep for plane steel frames in fire

2012 ◽  
Author(s):  
Hui Zhu ◽  
Yuching Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Steel Frames ◽  
Element 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.

Simplified Method for Horizontal Displacement Calculation of Frames at Elevated Temperature

2011 ◽  
Vol 243-249 ◽  
pp. 5269-5272
Author(s):  
Ya Tao Jing ◽  
Bo Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Horizontal Displacement ◽  
Deformation Characteristics ◽  
Horizontal Deformation ◽  
Element Analysis ◽  
Displacement Estimation ◽  
Feasible Method ◽  
Simplified Method ◽  
In Fire

The paper extracts two types of investigated models from frames in fire according to their horizontal deformation characteristics, and provides a simplified method to calculate horizontal deformation of frames, which can be applied to single- and multi-layers frames. Compared with the results by finite element analysis, it shows that the simplified method is a feasible method for the horizontal displacement estimation of frames in fire, and the treatment of the column restraint rigidity for multi-layers frame is appropriate.

Buckling Analysis of Sway Steel Frames with Semi-Rigid Connections

2011 ◽  
Vol 250-253 ◽  
pp. 3876-3879
Author(s):  
Wan Zhen Wang ◽  
Ji Xiang Xu ◽  
Fei Yi Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Steel Frames ◽  
Buckling Analysis ◽  
Nonlinear Finite Element ◽  
Effective Length ◽  
Finite Element Models ◽  
Rotational Stiffness ◽  
Element Analysis ◽  
Effective Length Factor

The modified factor formulas, which are applicable to sway steel frames, are derived by considering joint relative rotational stiffness and adopting the modified stiffness factor. The finite element models of steel frames with semi-rigid and rigid connections are established using ANSYS program. Nonlinear finite element analysis of steel frames with two web and top-seat angles steel semi-rigid connections is conducted. Through bulking analysis of sway steel frames with semi-rigid connections, the effective length factor of sway steel frames is derived, which considers nonlinear rotation of two web and top-seat angles steel semi-rigid connections.

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