Effective number of mega-bracing, in order to minimize shear lag

Zahiri-Hashemi, Rouzbeh; Kheyroddin, Ali; Farhadi, Basir

doi:10.12989/sem.2013.48.2.173

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…In the end, the impact that diagonal bracing placement on the exterior of the structure has on the shear lag effect is examined. A similar analysis is conducted in [24] where the use of mega bracing in tall buildings is studied with the conclusion that the X pattern diagonal bracing shows the most promising results regarding the reduction of the shear lag effect.…”

Section: Shear Lag Effect In Tube Structural Systemsmentioning

confidence: 99%

“…The same principle of bracing can be used for tube in tube structural systems [21]. In recent years, the research conducted is mostly based on parametric analysis of different structural systems [22][23][24][25]. In [22] a parametric analysis is conducted where the main parameter being varied are the layout dimensions of the building.…”

Section: Shear Lag Effect In Tube Structural Systemsmentioning

confidence: 99%

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Parametric Analysis of the Shear Lag Effect in Tube Structural Systems of Tall Buildings

Hafner¹,

Vlašić²,

Kišiček³

et al. 2020

Applied Sciences

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Horizontal loads such as earthquake and wind are considered dominant loads for the design of tall buildings. One of the most efficient structural systems in this regard is the tube structural system. Even though such systems have a high resistance when it comes to horizontal loads, the shear lag effect that is characterized by an incomplete and uneven activation of vertical elements may cause a series of problems such as the deformation of internal panels and secondary structural elements, which cumulatively grow with the height of the building. In this paper, the shear lag effect in a typical tube structure will be observed and analyzed on a series of different numerical models. A parametric analysis will be conducted with a great number of variations in the structural elements and building layout, for the purpose of giving recommendations for an optimal design of a tube structural system.

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Section: Shear Lag Effect In Tube Structural Systemsmentioning

confidence: 99%

Section: Shear Lag Effect In Tube Structural Systemsmentioning

confidence: 99%

Parametric Analysis of the Shear Lag Effect in Tube Structural Systems of Tall Buildings

Hafner¹,

Vlašić²,

Kišiček³

et al. 2020

Applied Sciences

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“…Ali and Moon (2007) identified that the purpose of the optimal design of a framed tube was to limit the effect of shear lag on the cantilever-type behavior of the structure. A cantilever deflection of 50 to 80 percent of the total lateral sway was achieved [2]. Singh and Nagpal (1994) investigated the variation in shear lag along the height of the framed tube structure.…”

Section: Previous Researchmentioning

confidence: 99%

“…For studying the effect of mega braces on shear lag of tube in tube system, two types of chevron and X bracing were added to the outer tube separately. According to equation offered by Kheyroddin and Zahiri Hashemi [2] for X and chevron braces in the steel building, the number of stories in a mega brace can be calculated by following equations (1 and 2): The number of braced stories of X-mega bracing:…”

Section: Fig 1: the Plan Of Mentioned Systemsmentioning

confidence: 99%

“…The distance between the external columns is normally 2 to 3 meters (up to 4.5 m) and the depth of peripheral beams varies between 0.6 to 1.3 meters [1]. The first application of tubular system was in Dewitt -Chestnut building in Chicago (1961) [2]. The major weakness of this system is shear lag which results in the non-uniform distribution of axial forces in the structural columns.…”

Section: Introductionmentioning

confidence: 99%

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Analyzing the Behavior of Hybrid Steel System of Tube in Tube with Bracing and Belt Truss

Kheyroddin

Madah

2018

NMCE

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Nowadays, due to the escalation in construction of high-rise structures, the need for selecting a proper resistant structural system against earthquake and wind has increased significantly. These systems should show an optimized use of materials and should be presented as a hard and efficient structure. A good example of a high efficient system in high-rise buildings can be indicated is, the tubular system that was introduced by Fazlur Khan for the first time. It has been applied in most tall buildings all over the world. The major weakness of these systems is shear lag which restricts the column capacity from functioning properly. An appropriate solution to resolve this problem is using a braced tube system. Also, because of increasing height of the structure, the use of braced tube structures alone is not effective to control the lateral structures. Therefore, a combination of the braced tube with the inner tube and belt truss is more efficient. This paper focuses on the behavior of the hybrid steel system of tube in tube with bracing and belt trusses. To this aim, some buildings were modeled with different structural systems and different number of stories and were analyzed in terms of shear lag in web and flange, lateral displacement and drift, and absorption percent of shear force under earthquake forces. From the results obtained, it can be concluded that the belt truss does not have a favorable impact on the shear lag in the flange, but it reduces drift significantly. In addition, by adding external bracing to tube in the tube structure with belt trusses, the performance of structure improved remarkably in the aspect of shear lag, lateral displacement and absorption percent of the shear force .

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