Modeling of cracking and local buckling in steel frames by using plastic hinges with damage

2021 ◽  
pp. 27-32
Author(s):  
P. Inglessis ◽  
S. Medina ◽  
A. López ◽  
J. Flórez-López
Keyword(s):  
Steel Frames ◽  
Local Buckling ◽  
Plastic Hinges

Modeling of local buckling in tubular steel frames by using plastic hinges with damage

2002 ◽  
Vol 2 (1) ◽  
pp. 21-34 ◽  
Author(s):  
Pether Inglessis ◽  
Samuel Medina ◽  
Alexis Lopez ◽  
Rafael Febres ◽  
Julio Florez-Lopez
Keyword(s):  
Steel Frames ◽  
Local Buckling ◽  
Plastic Hinges

The Plastic Hinge

2015 ◽  
pp. 172-230
Keyword(s):  
Reinforced Concrete ◽  
Structural Analysis ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Plastic Hinges

The plastic hinge is a key concept of the theory of frames that differentiates this theory from the remaining models for structural analysis. This chapter is exclusively dedicated to define this concept and describe the different models of plastic hinges. It also discusses the differences of implementation between plastic hinges in steel frames (Sections 6.1-6.4) and those in reinforced concrete structures (Sections 6.5-6.6). This chapter is based on the ideas presented in Chapter 5 and it allows formulating the models for elasto-plastic frames that are introduced in the next chapter.

A numerical investigation of overstrength and ductility factors of moment resisting steel frames retrofitted with GFRP plates

2014 ◽  
Vol 41 (1) ◽  
pp. 17-31 ◽  
Author(s):  
Mohammad Al Amin Siddique ◽  
Ashraf A. El Damatty ◽  
Ayman M. El Ansary
Keyword(s):  
Steel Frames ◽  
Local Buckling ◽  
Element Model ◽  
Steel Beams ◽  
Shell Elements ◽  
Glass Fiber Reinforced ◽  
Moment Resisting ◽  
Spring System ◽  
The Moment ◽  
Nonlinear Finite Element Model

This paper reports the results of an investigation conducted to assess the effectiveness of using glass fiber reinforced polymer (GFRP) plates to enhance the overstrength and ductility factors of moment resisting steel frames. The GFRP plates are bonded to the flanges of steel beams of the frame with an aim to enhance their local buckling capacities and consequently their ductility. The flexural behaviour of GFRP retrofitted beams is first determined using a nonlinear finite element model developed in-house. In this numerical model, consistent shell elements are used to simulate the flanges and web of the steel beam as well as the GFRP plate. The interface between the steel and the GFRP plate is simulated using a set of continuous linear spring system representing both the shear and peeling stiffness of the adhesive based on values obtained from a previous experimental study. The moment–rotation characteristics of the retrofitted beams are then implemented into the frame model to carry out nonlinear static (pushover) analyses. The seismic performance level of the retrofitted frames in terms of overstrength and ductility factors is then compared with that of the bare frame. The results show a significant enhancement in strength and ductility capacities of the retrofitted frames, especially when the beams of the frame are slender.

Research on Structural Influencing Coefficient of Moment-Resisting Steel Frames

2011 ◽  
Vol 105-107 ◽  
pp. 937-942
Author(s):  
Cheng Li ◽  
Qiang Gu ◽  
Jun Wang
Keyword(s):  
Strong Earthquake ◽  
Steel Frames ◽  
Local Buckling ◽  
Time History ◽  
Shell Element ◽  
Seismic Code ◽  
Behaviour Factor ◽  
Satisfactory Performance ◽  
Moment Resisting ◽  
Ductility Capacity

This paper is focused on the evaluation of the structural influencing coefficient in multi-story moment-resisting steel frames involving local bucking effect, with due consideration to both their ductility and overstrength. Ductility and overstrength play an important role in keeping satisfactory performance of structures during strong earthquake. Firstly, moment-resisting steel frames of are designed according to Chinese seismic code. Based on the non-linear shell element method, both inelastic time history and pushover analyses has been performed on these steel frames to get the global capacity envelopes. The results show that number of stores and spans have effect on the behaviour factor values, and that the local buckling affects the ductility capacity of steel frames. Finally, based on the findings presented in the article, tentative influencing coefficient values are proposed for moment-resisting steel frames.

Modeling of local buckling in tubular steel frames subjected to cyclic loading

2003 ◽  
Vol 81 (22-23) ◽  
pp. 2237-2247 ◽  
Author(s):  
Rafael Febres ◽  
Pether Inglessis ◽  
Julio Flórez-López
Keyword(s):  
Cyclic Loading ◽  
Steel Frames ◽  
Local Buckling

Analysis Methods Investigation of Steel Frames Accounting for Local Buckling

2011 ◽  
Vol 243-249 ◽  
pp. 1391-1395 ◽  
Author(s):  
Lian Kun Wang
Keyword(s):  
Flexural Strength ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Local Buckling ◽  
Shell Elements ◽  
Design Specifications ◽  
Inelastic Analysis ◽  
Analysis Methods ◽  
Eurocode 3 ◽  
Nonlinear Shell

Second-order inelastic analysis should be directly performed in order to overcome the difficulties of the conventional approach, but most of these analyses assume the section to be compact, and do not account for the degradation of the flexural strength caused by local buckling. Since the sections of real structures are not always compact, the analysis should be improved to consider local buckling. The objective of this paper is to investigate the plastic-zone and plastic hinge analysis methods of steel frames accounting for local buckling with nonlinear shell elements and design specifications as AICS-LRFD and Eurocode 3, which may be used as reference for the further study.

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