scholarly journals Evaluation of seismic performance factors for tension-only braced frames

2020 ◽  
Author(s):  
Shariati
Keyword(s):  
Seismic Performance ◽  
Seismic Energy ◽  
Lateral Force ◽  
Main Concern ◽  
Braced Frames ◽  
Steel Buildings ◽  
Performance Factors ◽  
R Factor ◽  
Non Linear ◽  
Margin Of Safety

The tension-only braced frames (TOBFs) are widely used as a lateral force resisting system (LFRS) in low-rise steel buildings due to their simplicity and economic advantage. However, the system has poor seismic energy dissipation capacity and pinched hysteresis behavior caused by early buckling of slender bracing members. The main concern in utilizing the TOBF system is the determination of appropriate performance factors for seismic design. A formalized approach to quantify the seismic performance factor (SPF) based on determining an acceptable margin of safety against collapse is introduced by FEMA P695. The methodology is applied in this paper to assess the SPFs of the TOBF systems. For this purpose, a trial value of the R factor was first employed to design and model a set of TOBF archetype structures. Afterwards, the level of safety against collapse provided by the assumed R factor was investigated by using the non-linear analysis procedure of FEMA P695 comprising incremental dynamic analysis (IDA) under a set of prescribed ground motions. It was found that the R factor of 3.0 is appropriate for safe design of TOBFs. Also, the system over strength factor (Ω0) was estimated as 2.0 by performing non-linear static analyses.

scholarly journals Seismic performance evaluation of high-rise steel buildings dependent on wind exposures

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983511
Author(s):  
Seonwoong Kim
Keyword(s):  
Seismic Performance ◽  
Response Spectrum ◽  
Slenderness Ratio ◽  
Lateral Force ◽  
Lateral Load ◽  
Seismic Load ◽  
Strong Wind ◽  
Steel Buildings ◽  
High Rise ◽  
Moderate Seismicity

The lateral load-resisting system of high-rise buildings in regions of low and moderate seismicity and strong wind such as the typhoon in the Korean peninsula considers the wind load as the governed lateral force so that the practical structural engineer tends to skip the evaluation against the seismic load. This study is to investigate wind-designed steel diagrid buildings located in these regions and check the possibility of the elastic design of them out. To this end, first, the diagrid high-rise buildings were designed to satisfy the wind serviceability criteria specified in KBC 2016. Then, the response spectrum analyses were performed under various slenderness ratio and wind exposures. The analyses demonstrated the good seismic performance of these wind-designed diagrid high-rise buildings because of the significant over-strength induced by the lateral load-resisting system of high-rise buildings. Also, the analysis results showed that the elastic seismic design process of some diagrid high-rise buildings may be accepted based on slenderness ratios in all wind exposures.

Seismic Collapse Analysis of Steel Plate Shear Wall Systems

2018 ◽  
Vol 763 ◽  
pp. 702-708 ◽  
Author(s):  
Abhishek Verma ◽  
Dipti Ranjan Sahoo
Keyword(s):  
Seismic Performance ◽  
Steel Plate ◽  
Numerical Models ◽  
Computer Software ◽  
Shear Walls ◽  
Lateral Force ◽  
Response Modification Factor ◽  
Performance Factors ◽  
Collapse Analysis ◽  
Web Plates

Steel Plate Shear Walls (SPSWs) have proven to be efficient lateral force-resisting systems. SPSWs utilize the post-yielding strength of the unstiffened web plates, which makes the system economically viable. ANSI/AISC 341-10 suggests the value of response modification factor for SPSWs to be 7, which is based on judgment and qualitative comparisons with response capabilities of previously well-studied systems. This study is focused on the evaluation of the seismic performance factors for SPSW systems through the collapse analysis in accordance with FEMA P695 recommendations. Three-and six-story SPSWs are considered in the study. Aspect ratio of the web plates is varied to obtain the archetypes. Numerical models of the study frames are developed and analyzed using a computer software OpenSees. The modelling technique is validated by comparing the predicted hysteretic response with the past experimental results. Both nonlinear static and dynamic analyses are conducted for the study frames. The results of the collapse analysis are presented and the values of seismic performance factors given in ANSI/AISC 341-10 are verified. Collapse mechanisms of the models for each ground motion are identified and a probability analysis is carried out to identify the most probable mechanisms. Further, suggestions are provided to avoid unnecessary over-strengthening and to ensure adequate collapse margin ratio.

scholarly journals A Review on Seismic Performance Analysis of High Rise Modular Steel Construction (MSC)

2021 ◽  
Author(s):  
Rishma Jasmin ◽  
Asif Basheer
Keyword(s):  
Seismic Performance ◽  
Lateral Force ◽  
Modular Construction ◽  
Steel Buildings ◽  
Sustainable Infrastructure ◽  
Construction Period ◽  
The Public ◽  
High Rise ◽  
Psychological Acceptance ◽  
Modular Structures

The construction industry has tried out a variety of trends in its field to bring out innovative, economic, efficient and sustainable infrastructure to meet the growing demand. One such development is the off-site manufactured modular steel buildings. The practice reduces the construction period as well as reduces wastage of resources. It was extensively used for low rise structures earlier, but due to increasing urban construction demand the practice is preferred nowadays in high rise structures too. For the high rise structures the lateral stability needed to be well looked into as there may arise a mass irregularity, structural irregularity, discontinuity etc. Psychological acceptance of such construction practice by the public is also not assured as they are not well aware of the advantages and use of the practice. And hence there is a need to conduct detailed and thorough investigation on its contradiction part to seismic performance. The modular construction consists of different structural systems and load transferring mechanisms. The integration of many materials and elements to modular structures are also discussed in various papers. But regarding lateral force resistance of its structural and non-structural components only limited research is conducted. Further research is required. The aim of the study is to provide a collective critical review on individual units or components of the structural system and their effects contributing to seismic resistance.

Seismic evaluation of single-storey steel buildings

1999 ◽  
Vol 26 (4) ◽  
pp. 379-394 ◽  
Author(s):  
M S Medhekar ◽  
DJL Kennedy
Keyword(s):  
Seismic Performance ◽  
Response Spectrum ◽  
Time History ◽  
Analytical Models ◽  
Steel Buildings ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Seismic Zones ◽  
Concentrically Braced Frame ◽  
Concentrically Braced

The seismic performance of single-storey steel buildings, with concentrically braced frames and a roof diaphragm that acts structurally, is evaluated. The buildings are designed in accordance with the National Building Code of Canada 1995 and CSA Standard S16.1-94 for five seismic zones in western Canada with seismicities ranging from low to high. Only frames designed with a force modification factor of 1.5 are considered. Analytical models of the building are developed, which consider the nonlinear seismic behaviour of the concentrically braced frame, the strength and stiffness contributions of the cladding, and the flexibility, strength, and distributed mass of the roof diaphragm. The seismic response of the models is assessed by means of a linear static analysis, a response spectrum analysis, a nonlinear static or "pushover" analysis, and nonlinear dynamic time history analyses. The results indicate that current design procedures provide a reasonable estimate of the drift and brace ductility demand, but do not ensure that yielding is restricted to the braces. Moreover, in moderate and high seismic zones, the roof diaphragm responds inelastically and brace connections are overloaded. Recommendations are made to improve the seismic performance of such buildings.Key words: analyses, concentrically braced frame, dynamic, earthquake, flexible diaphragm, low-rise, nonlinear, seismic design, steel.

A Framework for the Quantification of Non-Structural Seismic Performance Factors

2022 ◽  
pp. 1-27
Author(s):  
Daniele Perrone ◽  
Derek Rodriguez ◽  
Andre Filiatrault ◽  
Emanuele Brunesi ◽  
Clemens Beiter ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Performance Factors

Structural Systems for Mass Timber Buildings

2019 ◽  
Author(s):  
Tim Gleason ◽  
Gordana Herning ◽  
John Klein
Keyword(s):  
Affordable Housing ◽  
Lateral Force ◽  
Timber Structures ◽  
Braced Frames ◽  
Conventional Concrete ◽  
Composite Systems ◽  
Lateral Resistance ◽  
Mass Timber ◽  
Story Building ◽  
Gravity System

<p>This paper investigates the design of lateral force resisting systems (LFRS) for multi-story mass timber structures in Boston, MA. Structural and environmental tradeoffs of replacing conventional concrete cores or steel braced frames with glue-laminated timber (GLT) braced frames are evaluated through numerical analyses of 8-, 12-, and 18-story building prototypes. Finding an optimal timber gravity system configuration is followed by examining lateral resistance of the prototypes. The resulting designs demonstrate a practical approach to assist designers in selecting a lateral system during the early stages of conceptual design. This research was conducted in parallel with a related study for implementation of mass timber in affordable housing in Boston, enabling a comparison between composite systems and all-timber structures.</p>

scholarly journals Graphene used as a lateral force microscopy calibration material in the low-load non-linear regime

2018 ◽  
Vol 89 (11) ◽  
pp. 113902 ◽  
Author(s):  
Mathias J. Boland ◽  
Jacob L. Hempel ◽  
Armin Ansary ◽  
Mohsen Nasseri ◽  
Douglas R. Strachan
Keyword(s):  
Lateral Force ◽  
Linear Regime ◽  
Lateral Force Microscopy ◽  
Force Microscopy ◽  
Low Load ◽  
Non Linear ◽  
Calibration Material
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