Progressive collapse assessment of new hexagrid structural system for tall buildings

Mashhadiali, Niloufar; Kheyroddin, Ali

doi:10.1002/tal.1097

Cited by 26 publications

(11 citation statements)

References 12 publications

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“…To improve the ductility of a diagrid structure and avoid brittle failure of the structure under strong earthquakes, scholars have provided some improvement methods. For example, using a buckling‐restrained brace component (Figure a), that is, using core material made by low yield point steel in the centre of the component, will cause components to have enough plastic deformation under axial load . By using shear link (Figure b), the component can not only improve the ductility and damping of the structure but also be replaced .…”

Section: Mechanical Characteristics Of the Diagrid Structurementioning

confidence: 99%

A review of the diagrid structural system for tall buildings

Liu

Lü

et al. 2017

Structural Design Tall Build

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Unlike vertical columns of traditional structure, diagrid structural systems for tall buildings have special inclined columns. Due to the inclined columns, a diagrid structural system for tall buildings produces axial force along the column direction under horizontal load, which has the advantage of resisting horizontal wind load and seismic load and gives more freedom to architectural design, so a diagrid structural system for tall buildings becomes an effective new structure style for tall and super-tall buildings. Theories and tests regarding the diagrid structural system for tall buildings have been intensely researched since the exterior tube of diagrid structural system for tall buildings was first proposed by Torroja in his seminal book. At present, studies for mechanical characteristics, joint form, theories, and tests have been systematized. This paper systematically summarizes existing research achievements of the diagrid structural system for tall buildings and confirms that the structure has larger lateral stiffness and good seismic performance. Based on the favourable performance of concrete-filled steel tubes, this paper advises the use of concrete-filled steel tube columns as the columns in diagrid structural systems for tall buildings. KEYWORDS calculation theory, diagrid structure, integral test, joints, mechanical characteristics, review 1 | INTRODUCTION Diagrid structural systems for tall buildings are known as diagrid structures. The system is different from the traditional structure, which is also called an orthogonal structure ( Figure 1a) and has vertical columns and horizontal beams. A diagrid structure has inclined columns and ring beams ( Figure 1b). [1] Under horizontal load, the inclined columns of a diagrid structure mainly bear horizontal lateral force and mainly produce axial force along the column direction, which avoids the second-order bending moment and makes full use of the bearing capacity of the component. However, the beams and columns of orthogonal structures bear horizontal lateral force and produce significant bending moment and axial force, which can produce second-order bending moments. The triangle formed by ring beams and inclined columns is more stable than the quadrilateral formed by vertical columns and horizontal beams. In the shape design, a diagrid structure has advantages of more freedom of shape design, higher internal space utilization, and more material savings. [2,3] The ideal prototype of a diagrid structure was derived from the sketch proposed by Torroja in his seminal book (Figure 2a) in 1960. Then, Hirschmann built the 13-story IBM Pittsburgh building (Figure 2b) in the 1960s, which brought the ideal prototype into an engineering practice. [4] The 100-story John Hancock Center (Figure 2c) built in 1968 became the second tallest building in the world, and whereas it is a braced tubular structure, it reflects the great potential of the diagrid structure. Due to higher costs of handling joints and the reduced demand for tall and super-tall buildings at tha...

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Section: Mechanical Characteristics Of the Diagrid Structurementioning

confidence: 99%

A review of the diagrid structural system for tall buildings

Liu

Lü

et al. 2017

Structural Design Tall Build

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“…More recently, in [29] the progressive collapse of diagrid structures is assessed using nonlinear static pushdown analyses, considering the removal of structural elements, and by gradually increasing the vertical displacement in the location of the removed elements.…”

Section: Steel Buildings and Robustnessmentioning

confidence: 99%

Ultimate Capacity of Diagrid Systems for Tall Buildings in Nominal Configuration and Damaged State

Milana¹,

Olmati²,

Gkoumas

et al. 2015

Period. Polytech. Civil Eng.

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One of the evocative structural design solutions for tall buildings is recently embraced by the diagrid (diagonal grid) IntroductionIt is a common understanding that society requires enhanced structures for the people's needs. Besides safety and functional requirements collectively defined in the so-called Performancebased Design [1], today the attention focuses on the sustainability in the broader and profound sense of the word [2].Sustainability in the urban and built environment is a key issue for the wellbeing of people and society. Sustainable development, defined as the "development that meets the needs of the present without compromising the ability of the future generations to meet their own needs" [3] is nowadays a first concern for public authorities and the private sector. Sustainable design leads to innovation since it demands inventive solutions, and eventually is supported by a cultural shift, evident from national level reviews and surveys [4,5]. Sustainability issues are wide-ranging in the building industry but the main focus is the reduction of energy consumption in construction and use.In construction, steel has developed as a material of choice and offers a wide range of solutions that can make buildings more energy efficient, less costly to operate and more comfortable. Several green solutions, aiming at the minimization of structural steel, have been developed in the last few years. Among those, the diagrid structural system is considered as a promising solution for high-rise steel buildings. Diagrid is a perimeter structural configuration characterized by a narrow grid of diagonal members that are involved both in gravity and in lateral load resistance that has emerged as a new design trend recently for tall-shaped complex structures due to aesthetics and structural performance [6,7].Since diagrid requires less structural steel than a conventional steel frame, it provides for a more sustainable structure.This study focuses on the overall structural performance, the ultimate capacity and the robustness of diagrid tall buildings, using numerical (FE) methods. More precisely, the paper is organized in the following manner. Section 2 provides details on diagrid for high-rise buildings. Section 3 outlines structural robustness approaches for steel buildings. Section 4 introduces the case study steel high-rise building and the performed Finite Element (FE) numerical analyses. Finally, Section 5 provides some

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“…The authors also found out that the response appears to be sensitive to structural proportioning which suggests that further improvements in response may be obtained by better estimation of a structure's dynamic properties. Mashhadiali and Kheyroddin (2013) [6] assessed the progressive collapse-resisting capacity of new hexagrid structural system for tall buildings. The hexagrid structure is an innovative tube-type system.…”

Section: Previous Researchmentioning

confidence: 99%