Second-order plastic-hinge analysis of 3-D steel frames including strain hardening effects

Long, Hoang Van; Hung, Nguyen Dang

doi:10.1016/j.engstruct.2008.05.013

Cited by 18 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it can enhance the efficiency of the conventional plastic hinge method. Hoang and Nguyen [202,203] modified the plastic-hinge model to include the strain hardening effects [202] and the local buckling check according to Eurocode 3 [203]. Their work was implemented in the computer software CEPAO.…”

Section: Elastic Plastic-hinge Methodsmentioning

confidence: 99%

Review of Nonlinear Analysis and Modeling of Steel and Composite Structures

Thai

Nguyen

Lee

et al. 2020

Int. J. Str. Stab. Dyn.

View full text Add to dashboard Cite

Structural steel frames exhibit significantly geometric and material nonlinearities which can be captured using the second-order inelastic analysis, also known as advanced analysis. Current specifications of most modern steel design codes, e.g. American code AISC360, European code EC3, Chinese code GB50017 and Australian code AS4100 permit the use of advanced analysis methods for the direct design of steel structures to avoid tedious member capacity checks. In the past three decades, a huge number of advanced analysis and modeling methods have been developed to predict the behavior of steel and composite frames. This paper presents a comprehensive review of their developments, which focus on beam-column elements with close attention to the way to capture geometric and material nonlinearity effects. A brief outline of analysis methods and analysis tools for frames was presented in the initial part of the paper. This was followed by a discussion on the development of displacement-based, force-based and mixed beam elements with distributed plasticity and concentrated plasticity models. The modeling of frames subjected to fire and explosion was also discussed. Finally, a review of the beam-column models for composite structures including concrete-filled steel tubular (CFST) columns, composite beams and composite frames was presented.

show abstract

Section: Elastic Plastic-hinge Methodsmentioning

confidence: 99%

Review of Nonlinear Analysis and Modeling of Steel and Composite Structures

Thai

Nguyen

Lee

et al. 2020

Int. J. Str. Stab. Dyn.

View full text Add to dashboard Cite

show abstract

“…Van Long and Hung [13] proposed a strain hardening rule for frame section, which is applied in a beam-column element with traditional plastic hinge. Their strain hardening rule is able to describe three ranges, i.e.…”

Section: Elemental Flexibility Matrixmentioning

confidence: 99%

Direct plastic analysis of steel structures by flexibility-based element with initial imperfection

Liu

Shu

Chan

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

View full text Add to dashboard Cite

Second-order direct analysis has been used in some regions for reliable analysis and design of steel structures. Currently, the stiffness-based element is widely used with accuracy improved by enforcing equilibrium along mid-span or “stations” along the member length in order to achieve equilibrium which is not guaranteed along an element. In this paper, a flexibility-based beam-column element considering member imperfection based on Hellinger-Reissner functional is developed and used for practical second-order direct analysis. This new element is a flexibility-based element with member initial bowing at the element level for direct analysis of three-dimensional frame analysis whereas previous flexibility-based elements assumed perfectly straight geometry for the element. The fiber plastic hinge approach is adopted to account for the distributed plasticity of a section. The new flexibility-based element performs excellently for modeling of members under high stress with material yielded as the conventional stiffness-based element has less accuracy when few elements are used in modeling a plastic member. This will significantly enhance accuracy and computational efficiency for direct plastic analysis which can then be more widely used in practical design. Several examples are employed to validate the accuracy and efficiency of the proposed element along this line of thought.

show abstract

“…It is commonly accepted that a piecewise linear hardening model properly represents an actual steel stress-strain relationship [3]. Plastic deformations in a structure, independent of a nonlinear material model, can be evaluated using several different approaches: using the concentrated plastic hinge theory [4,5], defining semi-rigid connections [6], using the distributed plasticity approach [7] or by linearizing the nonlinear stress diagram of a cross section [8]. In most cases, especially when plasticity is 'concentrated' at the nodes, quite strict assumptions are made, which makes calculations relatively simple, nevertheless, the reliability of results may be insufficient.…”

Section: Introductionmentioning

confidence: 99%

“…The main goal of the current research is to evaluate the distribution of plastic deformations along the length and in depth (across the sections) of the elements by dividing the structure into multiple finite elements and assigning them different moduli of elasticity in case of material linear hardening effect. The suggested methodology is new compared to previous researches [4][5][6][7][8] because it is based only on the fundamental equilibrium and compatibility equations, i.e. an equilibrium between internal and external forces is satisfied in any point of structure at any given time and the plane section assumption is valid.…”

Section: Introductionmentioning

confidence: 99%

A Distributed Plasticity Approach for Steel Frames Analysis Including Strain Hardening Effects

Grigusevičius

Blaževičius

2019

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

This paper focuses on the creation and numerical application of physically nonlinear plane steel frames analysis problems. The frames are analysed using finite elements with axial and bending deformations taken into account. Two nonlinear physical models are used and compared -linear hardening and ideal elastic-plastic. In the first model, distributions of plastic deformations along the elements and across the sections are taken into account. The proposed method allows for an exact determination of the stress-strain state of a rectangular section subjected to an arbitrary combination of bending moment and axial force. Development of plastic deformations in time and distribution along the length of elements are determined by dividing the structure (and loading) into the parts (increments) and determining the reduced modulus of elasticity for every part. The plastic hinge concept is used for the analysis based on the ideal elastic-plastic model. The created calculation algorithms have been fully implemented in a computer program. The numerical results of the two problems are presented in detail. Besides the stress-strain analysis, the described examples demonstrate how the accuracy of the results depends on the number of finite elements, on the number of load increments and on the physical material model. COMSOL finite element analysis software was used to compare the presented 1D FEM methodology to the 3D FEM mesh model analysis. Keywordsreduced modulus of elasticity, distributed plasticity, incremental method, linear hardening, plastic deformations 402| Grigusevičius and Blaževičius Period.

show abstract

Second-order plastic-hinge analysis of 3-D steel frames including strain hardening effects

Cited by 18 publications

References 18 publications

Review of Nonlinear Analysis and Modeling of Steel and Composite Structures

Review of Nonlinear Analysis and Modeling of Steel and Composite Structures

Direct plastic analysis of steel structures by flexibility-based element with initial imperfection

A Distributed Plasticity Approach for Steel Frames Analysis Including Strain Hardening Effects

Contact Info

Product

Resources

About