Seismic performance assessment of tubular diagrid structures with varying angles in tall steel buildings

Heshmati, Mahdi; Khatami, Alireza; Shakib, Hamzeh

doi:10.1016/j.istruc.2020.02.030

Cited by 28 publications

(13 citation statements)

References 24 publications

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“…About a large portion of the input energy is carried by diagonal members. When the slope of exterior diagonals exceeds that of the perimeter tube, the diagrid core participates efficiently in dissipating energy [15]. Concrete Filled Steel Tubular (CFST) joints are widely adopted joint forms in diagrid structural systems.…”

Section: Vmentioning

confidence: 99%

Diagrid Mono Column Structures with Different Geometry in Plan: A Review

Johnson¹,

Raj²

2022

IJRASET

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Due to increasing urbanization and rapid infrastructural development, scarcity of land is a problem. Multi-story structures have been constructed to eliminate this problem. But for the requirement of large service spaces and good aesthetic appearances, the mono column structural system achieved popularity. Mono column structures are complicated since the mono column supports the whole structure and all other member acts as cantilevers. Mono column structures are vulnerable to seismic loads and adding a diagrid structural system on the periphery of the building improves seismic performances. This review paper aims to review the previous studies on mono column structure and diagrid structural system. It also focuses to review the performance of different plan geometry buildings.

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Section: Vmentioning

confidence: 99%

Diagrid Mono Column Structures with Different Geometry in Plan: A Review

Johnson¹,

Raj²

2022

IJRASET

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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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“…The existence of astounding structures in nature and the realization of the concepts of world wonders have influenced humanity from the beginning of their lives and encouraged them to emulate and adopt the natural structures for their benefit. Fast-growing advances in technology have facilitated integrating the nature inspirations into modern architectures and engineering practices over the last century (Heshmati et al, 2020;Khatami et al, 2020). By utilization of the structures existed in nature, engineers have initiated a movement within the construction of modern structures and infrastructures which are greatly inspired by nature and are similar to them (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Parametric study on application of Voronoi patterns in design of 2-D beams

Sehat

Khatami

2021

Advances in Structural Engineering

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The trend of engineering has been towards modern innovation in designs by maintaining not only the esthetic point of view but also stability and efficiency. In this regard, in this study, one of the nature-inspired structures, Voronoi tessellation, is introduced and applied as a structural configuration in the design of beams. Thus, various models of beams built with Voronoi diagrams are considered. To this end, first, the rules and regulations which govern the structure of Voronoi tessellation will be presented. Then various stages of generating the geometry of Voronoi beams will be described in detail. Considering the logical architectural requirements, the presented models are prepared as 2D-beams with different degrees of uniformity comprising the minimum and maximum Voronoi cells, which will be designed according to guidelines. In the next step, uniform loading under different boundary conditions will be applied to all Voronoi beams, and the results including structural weight, maximum displacement, and load-bearing capacity will be presented. The results of beams designed with Voronoi structures reveal that increasing the size of minimum cell will result in the rise of the maximum displacements as well as load-to-weight ratios and considerably reduce the weight of Voronoi beams but demonstrate sufficient load-bearing capacity. It also proves that as the non-uniformity of cells increases, displacements will grow. In addition, although the weight of samples will reduce, the load-to-weight ratios of the archetypes remain almost constant. Placing more supports for these structures will lead to an improvement in all aspects of design, especially on the response of beams with large spans.

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Seismic performance assessment of tubular diagrid structures with varying angles in tall steel buildings

Cited by 28 publications

References 24 publications

Diagrid Mono Column Structures with Different Geometry in Plan: A Review

Diagrid Mono Column Structures with Different Geometry in Plan: A Review

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

Parametric study on application of Voronoi patterns in design of 2-D beams

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