scholarly journals Mechanical analysis of a portal steel frame when subjected to a post-earthquake fire

Fire Research ◽  
2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Mohammed Redha Merouani ◽  
Belkacem Lamri ◽  
Abdelhak Kada ◽  
Paulo Piloto
Keyword(s):  
Human Life ◽  
Steel Structure ◽  
Mechanical Analysis ◽  
Steel Frame ◽  
Design Code ◽  
Standard Fire ◽  
Seismic Design Code ◽  
Fire Scenarios ◽  
Current Design ◽  
Algerian Seismic Code

Although current design code can manage the separate action of a fire or an earthquake, which causes a significant threat to the human life and to the integrity of the structures, the dual effect of a Post- Earthquake Fire (PEF) stands as a major hassle to designers and rescuers alike. Algerian seismic design code, RPA99v2003, with no exception does not consider the possibility of a subsequent fire after an earthquake, whose effect can significantly weaken the steel frame and destroy its fire protection. This paper presents the evaluation of the fire resistance for a two-storey steel portal frame, damaged by an earthquake simulated through spectrum response of Chlef, scaled three in the Algerian Seismic Code. First, the design of the steel structure considers seismic actions by a static nonlinear analysis. Second, it is followed by a fire analysis using an ISO834 standard fire model, considering that the structure is partially damaged. The finite element simulation and numerical analysis of the structure in post-earthquake fire condition yield the bilinear capacity curve at ambient temperature and the variation of local and global displacement at high temperature. A final comparison of the damaged (PEF) and undamaged (FIRE) frames subjected to the different fire scenarios is done.

Analysis of Seismic Checking of Panel Zone with Unequal Beam Height in Steel Structures

2012 ◽  
Vol 204-208 ◽  
pp. 2837-2840
Author(s):  
Su Juan Dai ◽  
Hui Yuan Shi ◽  
Xiu Ting Wei
Keyword(s):  
Shear Strength ◽  
Seismic Design ◽  
Steel Structure ◽  
Steel Structures ◽  
Calculation Formula ◽  
Design Code ◽  
Panel Zone ◽  
Seismic Design Code ◽  
Current Design ◽  
Beam Height

Seismic checking of panel zone for steel frame is very important in seismic checking of steel structure. This paper starts with the comprehension of new seismic design code of 2010, and the calculation formula of shear strength and yield bearing capacity for the panel zone is derived when the beam height in two side of joint is unequal, resorting to current Design Code for the Steel Structures and Seismic Design Code for Buildings. The formula is utilized for an engineering example in this paper, and it can provide some references for the design of steel structure.

Parameter Analysis of Compressive Web Members in Plane Tubular Truss with Simple Joints

2010 ◽  
Vol 163-167 ◽  
pp. 817-821
Author(s):  
Xiao Tong Peng ◽  
Qi Zhang ◽  
Xi Xia He
Keyword(s):  
Circular Tube ◽  
Steel Structure ◽  
Parameter Analysis ◽  
Effective Length ◽  
Width Ratio ◽  
Design Code ◽  
Fem Model ◽  
Finite Element Software ◽  
Current Design

Stability design for compressive web members of tubular structure could be simplified as determination of effective length of compressive web members. There were no design provisions for effective length of compressive web members in tubular truss in the current design code of steel structure (GB50017-2003). Based on previous research achievements, parameter analyses on compressive web members in tubular truss with simple joints were performed using finite element software, in which diameter ratios and wall thickness ratios of web members to chord members as well as different construction styles were considered. After analyzing 3 series, sum to 42 FEM model, the results indicates that stiffness ratio of web members to chord members has a significant effect on effective length of compressive web members, thus increasing width ratio of chord members to web members could decrease effective length of compressive web members; the effective length of compressive web member in circular tube truss is suitable to be 0.75 in-plane and out-plane, and 0.8 for the mixed truss of circular and square tube.

scholarly journals PERFORMANCE-BASED ANALYSIS OF PLANAR STEEL FRAME IN FIRE, The effect of different types of thermal insulation

2016 ◽  
Author(s):  
Anita Treven ◽  
Tomaž Hozjan ◽  
Miran Sajea
Keyword(s):  
Thermal Insulation ◽  
Mechanical Response ◽  
Mechanical Analysis ◽  
Steel Frame ◽  
Intumescent Coating ◽  
Natural Fire ◽  
Different Types ◽  
Fire Scenarios ◽  
In Fire

The paper presents a performance-based analysis of a planar steel frame exposed to natural fire conditions, if protected with different types of insulation.Bare steel elements, and elements protected with intumescent coating or insulation boards are considered. Two fire scenarios and two material models for steel, with and without the consideration of viscous creep, are applied in order to observe the effect of viscous creep. The analysis consists of three steps: (i) the determination of fire curves, (ii) the thermal analysis, and (iii) the mechanical analysis. Theexpansion of intumescent coating as well as heat flux within the voidspace between the steel surface and the insulation boards are also considered. It is shown that the choice of the thermal insulation has a significant effect on the mechanical response of the frame.

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.

scholarly journals Analysis of the robustness of a steel frame structure with composite floors subject to multiple fire scenarios

2021 ◽  
pp. 136943322199249
Author(s):  
Riza Suwondo ◽  
Lee Cunningham ◽  
Martin Gillie ◽  
Colin Bailey
Keyword(s):  
Progressive Collapse ◽  
Three Dimensional ◽  
Steel Structure ◽  
Frame Structure ◽  
Worst Case ◽  
Collapse Resistance ◽  
Fire Scenarios ◽  
Element Approach ◽  
The One ◽  
Steel Frame Structure

This study presents robustness analyses of a three-dimensional multi-storey composite steel structure under the action of multiple fire scenarios. The main objective of the work is to improve current understanding of the collapse resistance of this type of building under different fire situations. A finite element approach was adopted with the model being firstly validated against previous studies available in the literature. The modelling approach was then used to investigate the collapse resistance of the structure for the various fire scenarios examined. Different sizes of fire compartment are considered in this study, starting from one bay, three bays and lastly the whole ground floor as the fire compartment. The investigation allows a fundamental understanding of load redistribution paths and member interactions when local failure occurs. It is concluded that the robustness of the focussed building in a fire is considerably affected by the size of fire compartments as well as fire location. The subject building can resist progressive collapse when the fire occurs only in the one-bay compartment. On the other hand, total collapse occurs when fire is located in the edge three-bay case. This shows that more than one fire scenario needs to be taken into consideration to ensure that a structure of this type can survive from collapse in the worst-case situation.

Structural Integrity for Nuclear Power Plant Against Excessive Load on Design Extension Condition

2013 ◽  
Author(s):  
Daigo Watanabe ◽  
Kiminobu Hojo
Keyword(s):  
Nuclear Power ◽  
Structural Integrity ◽  
Safety Factors ◽  
Design Code ◽  
Acceptance Criteria ◽  
Integrity Assessment ◽  
Current Design ◽  
Factor Design ◽  
Excessive Load ◽  
Load And Resistance Factor

This paper introduces an example of structural integrity evaluation for Light Water Reactor (LWR) against excessive loads on the Design Extension Condition (DEC). In order to assess the design acceptance level of DEC, three acceptance criteria which are the stress basis limit of the current design code, the strain basis limit of the current design code and the strain basis limit by using Load and Resistance Factor Design (LRFD) method were applied. As a result the allowable stress was increased by changing the acceptance criteria from the stress basis limit to the strain basis limit. It is shown that the practical margin of the LWR’s components still keeps even on DEC by introducing an appropriate criterion for integrity assessment and safety factors.

Experimental Study and Finite Analysis on Flexural Capacity of Laminated Glass

2011 ◽  
Vol 243-249 ◽  
pp. 258-262
Author(s):  
Jun Chen ◽  
Jia Lv ◽  
Qi Lin Zhang ◽  
Zhi Xiong Tao ◽  
Jun Chen
Keyword(s):  
Experimental Results ◽  
Laminated Glass ◽  
Test Results ◽  
Design Code ◽  
Flexural Capacity ◽  
Equivalent Thickness ◽  
High Rise ◽  
Safety Glass ◽  
Current Design ◽  
Good Agreement

Laminated glass has been increasing widely used in high rise buildings as a kind of safety glass in recent years. So we should analyze its material property. In this paper, we use flexural experiments and ANSYS program to analyze the main factors that affect the flexural capacity of the laminated glass. The test results show that the flexural capacity is closely related to film. And the ANSYS program had got good agreement with the experimental results. Comparison of experimental results with calculated ones indicates that the current design code will lead to conservative results and the equivalent thickness of laminated glasses provided in the code should be further discussed.

Researches on the Shear Deformation of Joints Domain of Beam-to-Column Connection of Light Steel Structure

2012 ◽  
Vol 256-259 ◽  
pp. 1004-1007
Author(s):  
Xi Bing Hu ◽  
Jian Hua Lu
Keyword(s):  
Finite Element Method ◽  
Shear Deformation ◽  
Design Method ◽  
Steel Structure ◽  
Structure Calculation ◽  
The Finite Element Method ◽  
Mechanics Performance ◽  
Current Design ◽  
Internal Forces ◽  
Complex Parts

The joint domain of beam-to-column connection is very complex parts under loading, which plays an important role in transferring internal forces in light steel structure, such as moment, shear, axial force and so on. Considering the influence of its shear deformation in the structure calculation can help us to reflect the actual mechanics performance and evaluate precisely practical bearing capacity of the structure. According to the actual characteristics of beam-to-column connection, the author established some models of its joint domain, and used the finite element method to analyze and calculate shear deformation of these models. Meanwhile, the author researched the influence of the changes of various parameters to its shear deformation, and provided beneficial suggestions for revising the current design method of light steel structure finally.

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