scholarly journals Structural Analysis of Steel Structures under Fire Loading

10.14311/1083 ◽  
2009 ◽  
Vol 49 (1) ◽  
Author(s):  
C. Crosti
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Steel Structure ◽  
Steel Structures ◽  
Global Behavior ◽  
Fire Load ◽  
Stiffness Reduction ◽  
Fire Loading ◽  
The Right ◽  
Real Building

This paper focuses on the structural analysis of a steel structure under fire loading. In this framework, the objective is to highlight the importance of the right choice of analyses to develop, and of the finite element codes able to model the resistance and stiffness reduction due to the temperature increase. In addition, the evaluation of the structural collapse under fire load of a real building is considered, paying attention to the global behavior of the structure itself. 

scholarly journals Análise inelástica de segunda ordem em pórticos planos de aço

2016 ◽  
Vol 12 (3) ◽  
Author(s):  
Alex Sander Clemente De Souza ◽  
Margot Fabiana Pereira ◽  
Silvana De Nardin
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Three Dimensional ◽  
Steel Structures ◽  
Nonlinear Effects ◽  
Design Codes ◽  
Analysis Model ◽  
Plane Frames ◽  
Advanced Analysis ◽  
Simplified Procedures

RESUMO: Na análise estrutural de edifícios é necessária e exigida em códigos de projeto a consideração do comportamento não-linear do material e da estrutura para determinação de esforços e deslocamentos. O desenvolvimento de novos softwares permite a realização de análises mais rigorosas, como a análise avançada, em que é possível avaliar a capacidade resistente e a estabilidade da estrutura dispensando a verificação dos elementos isolados e ainda considerando os efeitos não-lineares, sejam eles físicos e/ou geométricos. Por outro lado, os códigos normativos ainda permitem procedimentos simplificados para a análise estrutural, embora seja relativamente comum o uso de métodos mais avançados de análise, como por exemplo, o Método dos Elementos Finitos. Pretende-se, com este estudo, fornecer subsídios para a compreensão dos códigos normativos e a importância da escolha do modelo de análise estrutural na fase de projeto. Neste contexto, a fim de exemplificar, os efeitos das não-linearidades geométrica e física sobre o comportamento da estrutura foram avaliados pórticos planos em aço por meio de modelagem avançada. Além disso, uma modelagem com elementos finitos de barra / mola foi desenvolvida e os resultados obtidos se mostraram compatíveis com aqueles dos modelos tridimensionais onde os perfis foram modelados com elementos de chapa. Desta forma contribui-se para ampliar o estado da arte sobre análise estrutural de forma integrada com o dimensionamento de estruturas metálicas. ABSTRACT: In structural analysis of buildings it is necessary and required in design codes include non -linear effects on the material and structure for determining forces and displacements. The development of new software allows more rigorous analyzes, such as the advanced analysis; it is possible to assess the strength and stability of a structure excusing the verification of separate structural elements and considering the nonlinear effects. The design codes allow structural analysis by simplified procedures. However, it has been used advanced analysis methods such as the Finite Element Method. The aim of this study provide support for the normative codes and the importance of choosing the structural analysis model in the design phase. In order to illustrate the effects of geometry and physical nonlinearities on the behavior of the structure was evaluated plane frames steel through advanced modeling. In addition, a finite element modeling bar / spring was developed and the results obtained were consistent with those of three-dimensional shell models. In this way it contributes to extend the state of the art structural analysis integrated with the design of steel structures.

Finite element analysis of tension-loaded ASTM A325 bolts under simulated fire loading

2018 ◽  
Vol 9 (1) ◽  
pp. 2-18
Author(s):  
Ali Shrih ◽  
Adeeb Rahman ◽  
Mustafa Mahamid
Keyword(s):  
Finite Element ◽  
Experimental Testing ◽  
Three Dimensional ◽  
Steel Structures ◽  
Fe Model ◽  
Repeated Testing ◽  
Element Analysis ◽  
Content Type ◽  
Fire Loading ◽  
Simulated Fire

Purpose Nuts and bolts have been used as fasteners of steel structures for many years. However, these structures remain susceptible to fire damage. While conducting fire experiments on steel structures is sometimes necessary, to better understand their behavior, such experiments remain costly and require specialized equipment and testing facilities. This paper aims to present a highly accurate three-dimensional (3D) finite element (FE) model of ASTM A325 bolt subjected to tension loading under simulated fire conditions. The FE model is compared to the results of experimental testing for verification purposes and is proven to predict the response of similar bolts up to certain temperatures without the need for repeated testing. Design/methodology/approach A parametric 3D FE model simulating tested specimens was constructed in the ANSYS Workbench environment. The model included the intricate details of the bolt and nut threads, as well as all the other components of the specimens. A pretension load, a tension force and a heat profile were applied to the model, and a nonlinear analysis was performed to simulate the experiments. Findings The results of the FE model were in good agreement with the experimental results, deviations of results between experimental and FE results were within acceptable range. This should allow studying the behavior of structural bolts without the need for expensive testing. Originality/value Detailed 3D FE models have been created by the authors have been created to study the behavior of structural bolts and compared with experiments conducted by the authors.

Finite Element Analysis and Improvement of Traverse Table Platform Based on Workbench and Pro/E

2014 ◽  
Vol 945-949 ◽  
pp. 1139-1142
Author(s):  
Jin Li ◽  
Guang Sheng Ren
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Size Structure ◽  
Structural Characteristics ◽  
Steel Structure ◽  
Steel Structures ◽  
Structure Model ◽  
Element Analysis ◽  
Software Analysis ◽  
Proper Size

According to amonoral parking space in traverse table platform technology parameters requirements and structural characteristics, the use of Pro/e software established structure model and imported into the finite element analysis software analysis Workbench, steel structure of the static analysis. Calculated the steel structures in design load maximum deformation.The results show that, by pro/E a structure model and the calculation method is reasonable, the calculation is of high accuracy, profile choose the proper size, structure deformation meet the design requirements.

scholarly journals Finite Element Analysis of Proposed Self-Locking Joint for Modular Steel Structures

2021 ◽  
Vol 11 (19) ◽  
pp. 9277
Author(s):  
Gohar Nadeem ◽  
Nor Azizi Safiee ◽  
Nabilah Abu Bakar ◽  
Izian Abd Karim ◽  
Noor Azline Mohd Nasir
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Steel Structure ◽  
Steel Structures ◽  
Vital Role ◽  
Moment Frame ◽  
Element Analysis ◽  
Element Approach ◽  
Special Moment Frame ◽  
Modular Structures

The intermodular connection between modules plays a vital role in the overall performance of modular structures. The separation between a column and connection is possible due to the absence of links (welding or bolting) since limited space is available between modules. This study proposed a self-locking joint to be used in a modular steel structure, connecting columns with a connection without need of extra space between modules. The behavior of the proposed connection subjected to monotonic load was evaluated using a finite element approach using ABAQUS software. The influencing factors contributed to the behavior of the self-locking connection and columns observed using a parametric study. The parametric study was conducted by varying beam thickness, bolt pretension force and friction coefficient µ. Results indicate that the proposed connection can be classified as a semirigid connection according to Eurocode 3 and special moment frame (SMF) as recommended by AISC.

Reduction in Inspection Costs for Dynamic Sensitive Steel Structures by Modal Based Fatigue Monitoring

2005 ◽  
Author(s):  
Henrik Hjelm ◽  
John D. So̸rensen ◽  
Rune Brincker ◽  
Kasper Munch ◽  
Jesper Graugaard-Jensen
Keyword(s):  
Finite Element ◽  
Steel Structure ◽  
Steel Structures ◽  
Arbitrary Point ◽  
Element Model ◽  
Strain Gauges ◽  
Inspection Planning ◽  
Load History ◽  
Fatigue Monitoring ◽  
Modal Coordinates

In risk based inspection planning the number of planned inspections directly depends on the uncertainty on the load history. In this paper it is shown how this uncertainty can be reduced by modal based fatigue monitoring. The technique is based on continuously measuring of the accelerations in few points of the structure. The accelerations are integrated to obtain the displacement and a modal decomposition of the obtained displacements is performed. The relation between the modal coordinates and the stress history in an arbitrary point of the structure is established by a calibrated finite element model. The technique has been applied on a wind loaded lattice pylon structure and compared with strain gauges measurements, showing that the uncertainty on the presented technique is quite small. It is shown that if the technique is applied to an offshore steel structure, then the number of required inspections may be reduced with more than 50%.

Creep Analysis of Steel Structures in High Temperature Using Finite Element Method

2012 ◽  
Vol 204-208 ◽  
pp. 1267-1270
Author(s):  
Yue Song Liu ◽  
Yu Ching Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Temperature ◽  
Nonlinear Behavior ◽  
Steel Structure ◽  
Steel Structures ◽  
Creep Analysis ◽  
Fire Effect ◽  
In Fire ◽  
Element Method

To predict the behavior of steel structure under fire effect, the material property is very important in the analysis of steel structure at high temperature. This paper adopted finite element method to investigate the nonlinear behavior of steel structures under high temperature and creep conditions. We studied the creep strains with different models of creep. Differences between these models are highlighted. Furthermore, the importance of creep effect in fire is discussed.

Design Method and Research of Adding Layers and Reinforcement of a Steel Structure

2012 ◽  
Vol 166-169 ◽  
pp. 1760-1764
Author(s):  
Song Yan Wang ◽  
Cheng Cheng Du ◽  
Jie Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Steel Structure ◽  
Steel Structures ◽  
Original Structure ◽  
Element Analysis ◽  
Steel Columns ◽  
The Finite Element Analysis ◽  
Practical Engineering

Due to the particularity, the reinforcement and reconstruction of steel structures should adopt a unique way. Combined with practical engineering, this paper introduces the program of Laizhou department store building reinforcement project. According to the specific requirements of the reinforcement and reconstruction, we analyze the original structure, introduce structure designs of the adding three layers as well as the reinforcement of bottom two layers, which makes construction more convenient and faster, and achieves the purpose of economic and appliance. The reinforcement of steel columns decide the period and cost. This paper expounds the reinforcement method of steel columns, and obtains the force of the bolt through the finite element analysis.

Research on Earthquake Load Analysis of Large Structures in Non-Slide Construction

2012 ◽  
Vol 157-158 ◽  
pp. 1632-1635
Author(s):  
Gong Sheng Yang
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Level Structure ◽  
Steel Structure ◽  
Steel Structures ◽  
Deformation Analysis ◽  
Seismic Load ◽  
Large Steel ◽  
Large Bulk ◽  
Earthquake Load

Ocean large steel structures are usually constructed on the slide site, being prone to forming large deformation because of its features such as heavy weight, large bulk and great span. However, the 18 large-scale steel structures of a nickel ore project are need to building on the non-slide foundation, resulting in different settlements of foundation. Moreover, the earthquake load is one of main load of the high-level structure. And the earthquake often happens suddenly and is out of control, with devastating destructive power. To ensure the safety of construction, it’s necessary to analyze the influence of large steel structure responding to the seismic load. This paper expounds the analyzing method on the response of the large steel structure based on non-slide site to the earthquake load. This article has analyzed responses of three-dimensional finite element model to the earthquake load with ANSYS analysis of finite element, such as the stress, deformation analysis, modal analysis and transient dynamic analysis, and assessed the risk of earthquake. This paper provides a feasible and effective analyzed method for researching the response of structure built on non-slide site to the earthquake load, which has important significance for the seismic design of the structure.

Behavior of ASTM A325 bolts under simulated fire conditions: experimental investigation

2017 ◽  
Vol 8 (4) ◽  
pp. 377-391 ◽  
Author(s):  
Ali Shrih ◽  
Adeeb Rahman ◽  
Mustafa Mahamid
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Steel Structures ◽  
Element Model ◽  
Content Type ◽  
University Of Wisconsin ◽  
Structural Assembly ◽  
Fire Loading ◽  
The University ◽  
Simulated Fire

Purpose Heavy hex structural bolts have been used in a wide range of steel structures for many years. However, these structures remain susceptible to fire damage. Conducting fire experiments on full-scale steel structures is costly and requires specialized equipment. The main purpose of this research is to test, analyze and predict the behavior of ASTM A325 bolts under tension loading in simulated fire conditions and develop a reliable finite element model that can predict the response of similar bolts without the need for repeated testing. Design/methodology/approach The experimental work was conducted at the University of Wisconsin-Milwaukee, where an electric furnace was custom-built to test a bolted specimen in tension under elevated temperatures. A transient-state testing method was adopted to perform a group of tests on 12.7 mm (½”) – diameter A325 bolts. The tests were divided into two groups: the first one was used to calibrate the equipment and choose a final testing arrangement and the second group, consisting of four identical tests, was used to validate a finite element model. Findings The temperature-displacement and load-displacement response was recorded. The tested bolts exhibited a ductile fracture in which a cup-and-cone shaped failure surface was formed in the threaded section at the root of the nut. ASTM A325 bolts are widely used by engineers in building and bridge construction, the results of this research enable engineers to determine the behavior and strength of ASTM A325 bolts when such bolts when exposed to fire event. Research limitations/implications Structural bolts are used to connect structural members, and they are part of structural assembly. To study the behavior of the bolts, the bolts only were investigated in a fire simulated in a furnace. The bolts studied were not part of a structural assembly. Practical implications The results of this study enable engineers to evaluate the condition of ASTM A325 bolts when subjected to fire loading. Originality value Tests were conducted at the University of Wisconsin – Milwaukee’s structures laboratory to study the effect of fire on an ASTM A325 bolts. Many tests under fire loading have been performed by researchers on different components of steel structures, this study focuses on studying the behavior of ASTM A325 bolts which are widely used in the USA.

Dynamic Characteristics of Base-Isolated Steel Frame under Seismic Ground Motion

2011 ◽  
Vol 255-260 ◽  
pp. 2341-2344
Author(s):  
Mohammad Saeed Masoomi ◽  
Siti Aminah Osman ◽  
Ali Jahanshahi
Keyword(s):  
Ground Motion ◽  
Base Isolation ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Seismic Load ◽  
Vector Method ◽  
Seismic Ground Motion

This paper presents the performance of base-isolated steel structures under the seismic load. The main goals of this study are to evaluate the effectiveness of base isolation systems for steel structures against earthquake loads; to verify the modal analysis of steel frame compared with the hand calculation results; and development of a simulating method for base-isolated structure’s responses. Two models were considered in this study, one a steel structure with base-isolated and the other without base-isolated system. The nonlinear time-history analysis of both structures under El Centro 1940 seismic ground motion was used based on finite element method through SAP2000. The mentioned frames were analyzed by Eigenvalue method for linear analysis and Ritz-vector method for nonlinear analysis. Simulation results were presented as time-acceleration graphs for each story, period and frequency of both structures for the first three modes.

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