A simple mathematical model for approximate analysis of tall buildings

Rahgozar, Reza; Ahmadi, Ali; Sharifi, Yasser

doi:10.1016/j.apm.2009.11.009

Cited by 42 publications

(34 citation statements)

References 13 publications

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“…Thus, the optimal location of outriggers along the height of the building plays a very important role in controlling the behavior of the whole building. In the early studies of optimal location of outriggers, the outriggers were seen as a whole part with stiffness, and detail information of the outriggers was neglected (Smith and Salim, ; Taranath, ; Smith and Coull, ; Wu and Li, ; Lee et al ., ; Rahgozar et al ., ). Hoenderkamp and Bakker (2003a), Hoenderkamp and Snijder (2003b) and Hoenderkamp () analyzed the outrigger with several types of forms and introduced the stiffness of different forms to the structural analysis.…”

Section: Introductionmentioning

confidence: 97%

An inter-story drift-based parameter analysis of the optimal location of outriggers in tall buildings

Zhou

Cuiqiang²,

Li³

2015

Struct. Design Tall Spec. Build.

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Summary Outriggers are usually added in structural systems of tall buildings to collaborate central shear walls with peripheral columns. With outriggers, the structural overturning moment can be balanced, and the inter‐story drift can be controlled under horizontal loads. Therefore, the optimal location of outriggers plays a very important role in controlling the behavior of the whole building. Existing research has focused on the optimal position of outriggers on the base of the structural roof deflection. In the engineering practice, however, inter‐story drift is the most important target to control the design of tall building structures. This paper investigates the theoretical method of inter‐story drift‐based optimal location of outriggers. A Matlab program is written to perform the parameter analysis of optimal location of outriggers. Take a 240‐m tall building for a target building, the optimal location of one to three sets of outriggers under wind and earthquakes is obtained and can be utilized for the structural preliminary design of tall buildings. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 97%

An inter-story drift-based parameter analysis of the optimal location of outriggers in tall buildings

Zhou

Cuiqiang²,

Li³

2015

Struct. Design Tall Spec. Build.

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“…A simple mathematical model for static analysis of a combined system of framed tube, shear core and one outrigger–belt truss has been developed to obtain stress and displacement distribution functions and determine the optimum location of outrigger–belt truss along the height of the structure (Rahgozar and Sharifi, ; Rahgozar et al ., ). In their work, they considered axial distribution along the height of the structure as cubic and quadratic functions in web and flange panels, respectively.…”

Section: Introductionmentioning

confidence: 97%

“…In this paper, a simple approximate model for the combined system of framed tube, shear core and one outrigger–belt truss structure based on research work conducted by Rahgozar and Sharifi (); Rahgozar et al . () is presented. Analogous to their work, the framed tube is modeled as a cantilevered hollow section beam with orthotropic plates and equivalent properties as shown in Figure (Kwan, ) and interaction between shear core and outrigger–belt truss on the framed tube system is modeled as rotating springs (Figure ) (Rahgozar and Sharifi, ; Rahgozar et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Parametric stress distribution and displacement functions for tall buildings under lateral loads

Rahgozar

Ahmadi²,

Ghelichi

et al. 2012

Structural Design Tall Build

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In this study, effects of applying higher order axial displacement distribution to solve a continuum model for static analysis of the combined system of framed tube, shear core and outrigger-belt truss system in high-rise buildings are investigated. Framed tube system is modeled using an orthotropic box beam analogy approach and the interaction between shear core and outrigger-belt truss system on framed tube is modeled with rotating spring placed at outrigger-belt truss location. The axial displacement distributions in web and flange panels along structure's height are proposed to be fifth-order and fourth-order polynomials, respectively. Analytic analyses are carried out on the basis of the principle of minimum potential energy. A detailed work is carried out through two numerical examples and the accuracy of proposed approximation functions is compared with previous work and finite element analysis. Results demonstrate that the proposed parametric stress distribution and displacement functions are more accurate than previously proposed functions in comparison with the finite element solution.

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“…[9][10][11] Several useful methods have been developed by far for tall building modeling by various researchers. Simple analytic methods has been presented for approximate analyses of either framed tube [12] or the combined system of framed tube, shear core, and belt truss systems [13,14] with the shear lag effect taken into account. In the study by Rahgozar et al, the shear lag is investigated in more details by higher order function for axial displacement distribution.…”

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confidence: 99%

Minimum‐weight design of high‐rise structures subjected to flexural vibration at a desired natural frequency

Alavi

Rahgozar

2018

Structural Design Tall Build

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Summary In this paper, a parametric approach for design of high‐rise structures subjected to flexural vibration is proposed. The optimization problem is formed based on a preselected value for the fundamental natural frequency, and it is formulated for minimum structural weight. In a two‐step approach, first, an alternative formulation aimed at maximizing structural stiffness that in turn maximizes structure's fundamental frequency is introduced. Then, optimized results are used in obtaining a closed‐form solution of the actual problem. Because the resulting equations are rather complicated, approximate forms are developed in order to simplify the design process. In all relations, contributions from shear forces to lateral displacement are assumed to be negligible; hence, bending resistance is the only design variable, and its optimal value is computable using simple relations. Two numerical examples are presented in order to illustrate the efficiency of this method in practice.

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A simple mathematical model for approximate analysis of tall buildings

Cited by 42 publications

References 13 publications

An inter-story drift-based parameter analysis of the optimal location of outriggers in tall buildings

An inter-story drift-based parameter analysis of the optimal location of outriggers in tall buildings

Parametric stress distribution and displacement functions for tall buildings under lateral loads

Minimum‐weight design of high‐rise structures subjected to flexural vibration at a desired natural frequency

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