Effect of Fire Exposure on Structural Response and Fireproofing Requirements of Structural Steel Frame Assemblies

2008 ◽  
pp. 206-206-17 ◽  
Author(s):  
B Bresler ◽  
RH Iding
Keyword(s):  
Structural Steel ◽  
Structural Response ◽  
Steel Frame ◽  
Fire Exposure

scholarly journals Progressive Collapse Assessment: A review of the current energy-based Alternate Load Path (ALP) method

2019 ◽  
Vol 258 ◽  
pp. 02012 ◽  
Author(s):  
Nur Ezzaryn Asnawi Subki ◽  
Hazrina Mansor ◽  
Yazmin Sahol Hamid ◽  
Gerard Parke
Keyword(s):  
Dynamic Analysis ◽  
Static Analysis ◽  
Progressive Collapse ◽  
Structural Response ◽  
Steel Frame ◽  
Collapse Mechanism ◽  
Load Path ◽  
Acceptance Criterion ◽  
Current Energy ◽  
Collapse Assessment

The Alternate Load Path (ALP) is a useful method that has generated a considerable recent research interest for the assessment of progressive collapse. The outcome of the ALP analysis can be assessed either using the force-based approach or the energy-based approach. The Unified Facilities Criteria (UFC- 4- 023-03) of progressive collapse guideline - have outlined that the force-based approach can either be analysed using static or dynamic analysis. The force-based approach using static analysis is preferable as it does not require a high level of skill and experience to operate the software plus no effort is required in scrutinising the validity of the analysis results output. However, utilising the static approach will eliminate the inertial effect in capturing the actual dynamic response of the collapsed structure. In recent years, the development of the energy-based progressive collapse assessment is attracting widespread interest from researchers in the field; as the approach can produce a similar structural response with the force-based dynamic analysis by only using static analysis. Most of the current energy-based progressive collapse assessments are developed following the requirements which are given in the progressive collapse guidelines provided by the Unified Facilities Criteria. However, little attention is given to the development of the energy-based approach using the Eurocode standards as a base guideline. This article highlights the merits of utilising the energy-based approach against the force-based approach for a collapsed structure and explains the collapse mechanism of a steel frame in the perspective of the energy concept. The state of the art of energy-based progressive collapse assessment for a structural steel frame is reviewed. The comprehensive review will include insights on the development of the energy-based method, assumptions, limitations, acceptance criterion and its applicability with the European standards. Finally, potential research gaps are discussed herein.

scholarly journals Influence of Anchor Connector Stiffness on Displacement-Internal Force of Steel-Concrete Frame

2019 ◽  
Vol 8 (2) ◽  
pp. 3614-3619
Keyword(s):  
Structural Steel ◽  
Stiffness Matrix ◽  
Composite Beam ◽  
Concrete Beam ◽  
Internal Force ◽  
Beam Element ◽  
Steel Frame ◽  
Concrete Frame ◽  
Load Vector ◽  
The Impact

In the article, the author introduces how to determine the equivalent hardness of steel-concrete composite beam element, stiffness matrix and nodal load vector of steel-concrete beam element. Thereby, to build and solve the problem of analyzing the structural steel frame of concrete considering the anchor stiffness, programming and clarifying the impact of anchor stiffness associated with displacement - internal force of the frame

Stress Impact Analysis of Steel Frame with Different Beam-Column Connection Mode

2013 ◽  
Vol 275-277 ◽  
pp. 1028-1033
Author(s):  
Gang Wang
Keyword(s):  
Impact Analysis ◽  
Structural Response ◽  
Time History ◽  
Horizontal Displacement ◽  
Element Model ◽  
Steel Frame ◽  
Frame Structure ◽  
Natural Period ◽  
Vibration Period ◽  
Steel Frame Structure

This paper uses the SAP2000 to establish different beam column connections of steel frame structure finite element model, comparative analysis of the beam column for the rigid connection, hinged, semi-rigid connections of steel frame structure, the dynamic characteristics of structure displacement and internal force influence. At the same time, the dynamic time-history analysis method for structural displacement supplementary checking, analysis of structural response to seismic wave degree．The results showed that：compared with rigid, the structure of semi-rigid connections to the larger natural period，and with the rotation stiffness decreases vibration period increases; Semi-rigid steel frame connection to reduce the resistance to push the layer stiffness，making the structure of the horizontal displacement increased．

scholarly journals Behavior of RC Beams Strengthened with NSM-CFRP Strips Subjected to Fire Exposure: A Numerical Study

2021 ◽  
Vol 11 (6) ◽  
pp. 7782-7787
Author(s):  
H. A. Al-Baghdadi ◽  
A. Sabah
Keyword(s):  
Numerical Study ◽  
Numerical Models ◽  
Fire Behavior ◽  
Three Dimensional ◽  
Structural Response ◽  
Rc Beams ◽  
Fire Exposure ◽  
Efficient Technology ◽  
Near Surface ◽  
Endurance Tests

The use of Near-Surface Mounted (NSM) Carbon-Fiber-Reinforced Polymer (CFRP) strips is an efficient technology for increasing flexural and shear strength or for repairing damaged Reinforced Concrete (RC) members. This strengthening method is a promising technology. However, the thin layer of concrete covering the NSM-CFRP strips is not adequate to resist heat effect when directly exposed to a fire or at a high temperature. There is clear evidence that the strength and stiffness of CFRPs severely deteriorate at high temperatures. Therefore, in terms of fire resistance, the NSM technique has a significant defect. Thus, it is very important to develop a set of efficient fire protection systems to overcome these disadvantages. This paper presents a numerical study that investigates the fire behavior of thermally insulated RC beams flexurally strengthened with NSM-CFRP strips and subjected to fire exposure according to the ISO 834 standard. The numerical study considered three-dimensional finite element models in the ABAQUS software that have been developed to simulate and predict the performance (thermal and structural response) of fire endurance tests on strengthened, uninsulated strengthened, and thermally insulated beams strengthened with NSM-CFRP strips, which were exposed to fire and had different fire insulation schemes. The insulation used was plaster from local material with a thickness range of 25 to 50mm. The variation of the thermal and mechanical properties with the temperature of the constituent materials was considered. All beams' mechanical and thermal responses were adequately simulated using numerical models. The results of the numerical simulations were in good agreement with the experimental data. The fire behavior of the NSM-CFRP strengthened RC beams was examined and particularly the efficiency of the NSM strengthening system during the fire. The behavior in the fire of the NSM-CFRP strengthening system on the RC beams thermally protected with different fire insulation schemes was assessed. Finally, the effectiveness of fire insulation was studied.

scholarly journals A numerical approach for evaluating residual capacity of fire damaged concrete members

2020 ◽  
Vol 10 (2) ◽  
pp. 230-242
Author(s):  
Venkatesh Kodur ◽  
Ankit Agarawal
Keyword(s):  
Numerical Model ◽  
Mechanical Response ◽  
Structural Response ◽  
Numerical Approach ◽  
Fire Exposure ◽  
Ambient Conditions ◽  
Concrete Members ◽  
Fire Scenarios ◽  
Residual Capacity ◽  
Residual Response

This paper presents an approach to evaluate residual capacity of fire-damaged concrete structures. The approach involves capturing response in three stages; namely, structural response at ambient conditions (prior to fire exposure), thermo-mechanical response during fire exposure, and post-fire residual response after cooling down of the structural member. The proposed approach is implemented in a comprehensive numerical model developed in the finite element computer program ABAQUS for specifically evaluating residual capacity of an RC beam after exposure to different fire scenarios. Predictions from the numerical model are utilized to highlight importance of each stage of analysis in evaluating realistic residual capacity of fire damaged concrete members.

Experimental study of unloaded structural steel stay-cables under fire exposure

2020 ◽  
Author(s):  
Benjamin Nicoletta ◽  
Scott Watson ◽  
Bronwyn Chorlton ◽  
John Gales ◽  
Panagiotis Kotsovinos
Keyword(s):  
Experimental Study ◽  
Structural Steel ◽  
Fire Exposure ◽  
Stay Cables

Shaking Table Test of Steel Frame Structure in Sine-Swept Vibration and its Virtual Realization

2013 ◽  
Vol 454 ◽  
pp. 204-208
Author(s):  
Hong Biao Liu ◽  
Qiang Zhang ◽  
Xian Peng Liu
Keyword(s):  
Shaking Table Test ◽  
Dynamic Properties ◽  
Structural Response ◽  
Time Domain Analysis ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
The Difference ◽  
Dynamic Time ◽  
Steel Frame Structure

The accurate sine-swept function is proposed by theoretic derivation. The natural frequencies of five-story steel frame structure in transverse direction were identified by modal test. Based on the numerical simulation results of steel frame structure excited by sine-swept vibration, it is proved that the difference of structural response between forward excitation and backward excitation is little,and both the results of them can be used to evaluate the dynamic property of structure. However, it is proper to decide whether the response results of structure should be modified or not based on the dynamic properties of table-board. The conclusions above can provide basis for design and dynamic time-domain analysis of shaking table test in sine-swept excitation.

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