Seismic performance factors for low‐ to mid‐rise steel diagrid structural systems

Asadi, Esmaeel; Adeli, Hojjat

doi:10.1002/tal.1505

Cited by 28 publications

(10 citation statements)

References 50 publications

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“…This value is assumed to a constant value of 0.4 for structures with period based ductility (μT) greater than 3.0. 0.2 ≤ βRTR = 0.1 + 0.1 μT ≤ 0.4 (9) DR uncertainty (βDR) is defined as the completeness and robustness of the design requirements that is used to design archetypes. TD uncertainty (βTD) is related to the completeness and robustness of the test data, which is used to prepare analytical models of archetypes.…”

Section: Nonlinear Dynamic Analysesmentioning

confidence: 99%

Evaluation of Seismic Performance Factors for Concrete Filled Steel Tube Diagrid Structural System

Mehtani

Patel

2022

ASPS Conf. Proc.

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Seismic performance factors are used in current building codes and standards to estimate strength and deformation demands on seismic force resisting systems that are designed using linear methods of analysis, but are responding in the nonlinear range. Many recently evolved seismic force resisting systems have never been subjected to any signi?cant level of earthquake ground shaking. As a result, the seismic response characteristics of many systems, and their ability to meet seismic design performance objectives, are both untested and unknown. Therefore, it is necessary to determine the seismic performance factors of new seismic force resisting systems proposed for inclusion in building codes that will result in equivalent safety against collapse during an earthquake when properly implemented in the seismic design process. In this study, the response modification factor, overstrength factor and period based ductility for concrete filled steel tube (CFST) diagrid structural system are evaluated. To quantify these factors, the rational procedure introduced in Federal Emergency Management Agency (FEMA) P695, which is based on low probability of structural collapse and encompasses nonlinear static and dynamic analyses, is used. To this end, performance group consisting of 4, 8, 16 and 24 storey diagrid structures with 50° angle of external braces is considered. Nonlinear static analyses are performed to obtain overstrength factor and period?based ductility. Incremental dynamic analyses are then performed to assess collapse margin ratio of the archetypes. For modelling and numerical analysis, Open System for Earthquake Engineering Simulation (OpenSees), an open source software is used.

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Section: Nonlinear Dynamic Analysesmentioning

confidence: 99%

Evaluation of Seismic Performance Factors for Concrete Filled Steel Tube Diagrid Structural System

Mehtani

Patel

2022

ASPS Conf. Proc.

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“…In summary, the results showed that although low-to -midrise structures designed with response spectrum analysis met the collapse criteria with considerable safety, long period structures failed to satisfy these criteria. Also in recent years, some scholars employed this methodology to assess and quantify SPFs of conventional structural systems [18][19][20][21][22][23][24][25].…”

Section: Sn Applied Sciencesmentioning

confidence: 99%

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

2021

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This study presents the impact of near-field and far-field earthquakes on the seismic design of Intermediate Moment Resisting Frame (IMRF) and Special Moment Resisting Frame (SMRF) structures through FEMA (Federal Emergency Management Agency) P695 methodology to highlight the importance of probabilistic collapse as well as seismic performance factors of these structures. The purpose of this study is to investigate the collapse performance of steel intermediate and special moment resisting frame systems as the most common structural systems in urban areas in order to assess the seismic performance factors used for the design using nonlinear static and dynamic analysis methods. In this regard, as the representatives of low-rise to high-rise buildings, archetypes with 5-, 10- and 15- story of intermediate and special moment resisting frames are designed and then the nonlinear models are developed in OpenSees software. Nonlinear static analyses are performed to assess the overstrength and ductility of these systems. The effects of near-field and far-field ground motions on these frames are investigated through incremental dynamic analysis. These analyses are performed with 22 far-field and 20 near-field ground motion records using FEMA P695 methodology. The results show that near-field earthquakes have serious impacts on the collapse probability of structures. The superiority of special moment resisting frame over intermediate moment resisting frame is quantified in terms of safety margin and median collapse capacity under both near-field and far-field earthquakes. Finally, the results indicate that the response modification factors introduced in seismic design code are acceptable for intermediate moment resisting frame and special moment resisting frame under far-field ground motions. However, in the near-field sites while SMRF system meets the requirements of FEMA P695 methodology, the IMRF system does not satisfy these criteria.

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“…In more recent studies, Tomei et al [17] used genetic algorithm (GA) approach to optimize regular and irregular diagrid systems with complex geometries aiming to minimize the required structural weight. Asadi and Adeli [18] also carried out studies to evaluate the seismic performance parameters for low to mid-rise diagrid structures. In their studies, an R-factor in the range of 4 to 5 was recommended for typical steel diagrid frames with 8 to 30 storeys.…”

Section: An Overview On the Applications Of Diagrid Structural Systemmentioning

confidence: 99%

Seismic reliability analysis and estimation of multilevel response modification factor for steel diagrid structural systems

Mohsenian

Padashpour

Hajirasouliha

2020

Journal of Building Engineering

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Seismic performance factors for low‐ to mid‐rise steel diagrid structural systems

Cited by 28 publications

References 50 publications

Evaluation of Seismic Performance Factors for Concrete Filled Steel Tube Diagrid Structural System

Evaluation of Seismic Performance Factors for Concrete Filled Steel Tube Diagrid Structural System

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

Seismic reliability analysis and estimation of multilevel response modification factor for steel diagrid structural systems

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