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

Abstract

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.

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

“…With the utilization of the prerequisites studied in preceding section, problem (3) can be solved now. As mentioned before, the stiffness function (15) is valid here as the optimal solution, but D should be specified so that the fundamental natural frequency fits the limited value, or Λ f ¼ Λ*. For a selected value for Λ* and known of m, D min , and ℓ, the parameter θ c can be determined from Equations (11) and (13) as…”

“…Simple analytic methods has been presented for approximate analyses of either framed tube or the combined system of framed tube, shear core, and belt truss systems 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 . Also, in the field of dynamic analyses of tall buildings, plentiful papers can be found.…”

“…In the study by Rahgozar et al, the shear lag is investigated in more details by higher order function for axial displacement distribution. [15] Also, in the field of dynamic analyses of tall buildings, plentiful papers can be found. Suitable models have been proposed for estimating fundamental frequencies of tall buildings.…”

Seismic performance of outrigger–belt truss system considering soil–structure interaction

“…An effective technique to resist lateral loading in tall building is to use an outrigger-braced system. This system is comprised of a central core (braced frame or shear wall) which connects to the peripheral columns by horizontal outrigger braces or deep girders (Rahgozar et al 2014;Malekinejad et al 2016).…”

Open and closed shear-walls in high-rise structural systems: Static and dynamic analysis

“…However, only one degree of freedom (DOF) per storey is considered, and the torsional and flexural problems are separated treated. Similar models have also been developed for three-dimensional structures, in particular for framed-tube structures, as described by Khan [17], Coull and Bose [18], Connor et al [19], Kwan [20], and Rahgozar et al [21] among others. Moreover, other simplified methods can be applied in cases where the vertical stiffening structures are constituted by frames [22,23], or by open shear walls [24].…”