Steel frame with aseismic floor: From the viscoelastic decoupler model to the elastic structural response

2021 ◽  
Author(s):  
Yang Xiang ◽  
Yuji Koetaka ◽  
Kohei Nishira
Keyword(s):  
Structural Response ◽  
Steel Frame

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.

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．

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.

scholarly journals Effect of Number and Position of Rotational Friction Dampers on Seismic Response of Steel Frame

2019 ◽  
Vol 21 (1) ◽  
pp. 99-104
Author(s):  
Ionuț-Sergiu Oance ◽  
Sunai Gelmambet
Keyword(s):  
Seismic Response ◽  
Structural Response ◽  
Time History ◽  
Steel Frame ◽  
Base Shear ◽  
Friction Dampers ◽  
Stiffness Constant ◽  
Time Period ◽  
History Analysis ◽  
Energy Dissipated

Abstract This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.

scholarly journals Structural response of a steel-frame building to horizontal and vertical travelling fires in multiple floors

2017 ◽  
Vol 91 ◽  
pp. 542-552 ◽  
Author(s):  
Egle Rackauskaite ◽  
Panagiotis Kotsovinos ◽  
Guillermo Rein
Keyword(s):  
Structural Response ◽  
Steel Frame ◽  
Frame Building

Isolating the effect of ground-motion duration on structural damage and collapse of steel frame buildings

2020 ◽  
Vol 36 (2) ◽  
pp. 718-740
Author(s):  
Esra Zengin ◽  
Norman A Abrahamson ◽  
Sashi Kunnath
Keyword(s):  
Ground Motion ◽  
Structural Damage ◽  
Damage Index ◽  
Structural Response ◽  
Steel Frame ◽  
Limit States ◽  
Long Duration ◽  
Frame Buildings ◽  
Steel Frame Buildings ◽  
Structural Responses

The debate over the significance of ground-motion duration is long-standing and the literature on the influence of duration on structural response is extensive. Decoupling of the duration from other characteristics of the ground motion is crucial for accurate quantification of its effect on structural responses. This article presents a new methodology that isolates the duration from the amplitude, frequency content, and rate of energy build-up of the ground motion. This is achieved by selecting short- and long-duration record pairs that are equated on the basis of spectral shape and the slope of the Husid plot. The use of the initial rate of Arias Intensity as a control parameter is novel in the literature. The proposed approach enables the examination of the sole effect of the duration on structural responses of 2-story and 9-story steel frame buildings. We find that the maximum interstory-drift ratios are not generally sensitive to the duration differences between short- and long-duration record sets, whereas the cumulative damage parameters (i.e. dissipated hysteretic energy and Modified Park–Ang Damage Index) of the buildings considered in this study are affected by duration. Finally, we extend the study to collapse limit states and find that duration has a small effect on structural collapse capacity, after controlling three key ground-motion parameters.

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