Dynamic analysis of combined system of framed tube and shear walls by Galerkin method using B‐spline functions

Rahgozar, Reza; Mahmoudzadeh, Zahra; Malekinejad, Mohsen; Rahgozar, Peyman

doi:10.1002/tal.1201

Cited by 17 publications

(10 citation statements)

References 25 publications

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“…Therefore, if horizontal loadings are to be efficiently resisted, the appropriate structural form in a tall building should be determined (Kamgar and Saadatpour 2012). There are different structural forms of tall buildings and numerous researches have been carried out about the approximate and exact methods of investigating the behavior, deflection, vibration, optimal design and control of such buildings (Rahgozar et al 2015;Alavi et al 2018;Khatibinia et al 2018;Kamgar et al 2018). An effective technique to resist lateral loading in tall building is to use an outrigger-braced system.…”

Section: Introductionmentioning

confidence: 99%

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

Tavakoli

Kamgar

Rahgozar

2019

Int J Adv Struct Eng

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The focus of this study is to investigate the seismic behavior of outrigger-braced building considering the soil-structure interaction based on finding the best location of outrigger and belt truss system. For this purpose, a central outrigger-braced frame of a steel tall building is considered. A layered soil deposit underlied this frame and the resulting soil-structure system is subjected to seismic excitation. To analyze this system, direct method is employed in OpenSees. Also, elastic and in-elastic analyses are both considered and a comparison is made between current results and the results related to the system with fixed base. The best location of outrigger-belt truss system is determined by considering the maximum roof displacement, base moment and base shear with and without soil-structure interaction. It is shown that considering SSI affects the location of outrigger-belt truss system. Elastic analysis of both systems, namely with fixed base and with soil-structure interaction, showed that locating the belt truss at higher stories caused lower amounts of roof displacement.

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Section: Introductionmentioning

confidence: 99%

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

Tavakoli

Kamgar

Rahgozar

2019

Int J Adv Struct Eng

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“…They showed that the deformed shape of the shear wall–frame structural system is the combination of flexural mode and shear mode. Rahgozar et al presented a dynamic analysis of combined system of framed tube and shear walls by Galerkin method using B‐spline functions. Kamgar et al determined the first natural frequency of tall buildings with a combined system of framed tube, shear core, belt truss, and outrigger system with multiple jumped discontinuities in the cross‐section of framed tube and shear core under axial force.…”

Section: Introductionmentioning

confidence: 99%

A new approach for free vibration analysis of nonuniform tall building structures with axial force effects

Ramezani

Mohammadizadeh

Shojaee

2019

Structural Design Tall Build

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Dynamic analysis of beam-like structures is significantly important in modeling actual cases such as tall buildings and several other related applications as well. This article studies free vibration analysis of tall buildings with nonuniform cross-section structures. A novel and simple approach is presented to solve natural frequencies of free vibration of cantilevered tall structures with variable flexural rigidity and mass densities. These systems could be replaced by a cantilever Timoshenko beam with varying cross-sections. The governing partial differential equation for vibration of a nonuniform Timoshenko beam under variable axial loads is transformed with varying coefficients to its weak form of integral equations. Natural frequencies can be determined by requiring the resulting integral equation, which has a nontrivial solution. The presented method in this study has fast convergence. Including high accuracy for the obtained numerical results as well. Numerical examples including framed tube as well as tube-in-tube structures are carried out in the study and compared with available results in the literature, and also with the results obtained from finite element analysis in order to show the accuracy of the proposed method in the study. Obtained results indicate that the presented method in this study is powerful enough for the free vibration analysis of tall buildings. KEYWORDS axial force, free vibration, nonuniform, tall building, Timoshenko beam, weak form integral equation 1 | INTRODUCTIONFree vibration analysis plays an important role in the structural design of tall buildings, especially for the first mode because the first mode shape is a dominant component in wind and earthquake-induced vibrations of tall buildings. Therefore, it is important to investigate the calculating methods of natural frequencies and mode shapes for tall buildings. Many researchers in structural engineering have devoted to obtain accurate theoretical results for the free vibration of tall buildings in the past decades. In free vibrations analysis of cantilevered tall structures, it is possible to regard them as beams with variable cross-section. [1,2] Wang [3] derived the closed-form solutions for the free flexural vibration of a beam with variably distributed stiffness, but uniform mass. Li et al. [1] and Li [4] studied the free flexural vibration of tall buildings as well as high-rise structures, which have variably distributed stiffness and mass. However, the effect of axial forces acting on the cantilevered structures with variable cross-section on natural frequencies and mode shapes was not considered. The subject of free vibration of nonuniform beams has been paid attention by many researchers. However, few of them have considered the effects of axial forces on beam vibration frequencies. Most of these studies include simplifications in calculation process such that the governing differential equation becomes manageable to solve. Li et al. [5] investigated free vibration of cantilevered tall structures under various ...

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“…[21][22][23][24][25][26][27][28][29] This paper focuses on the numerical solution of two-dimensional (2D) elastodynamic problems by using a new and attractive method that is named weight-adaptive space-time discontinuous isogeometric analysis (WA-STDIGA). Before giving some additional explanations about the proposed approach, it is worthwhile to note that the IGA is a new powerful numerical method first proposed by Hughes et al 30 Dynamic and static analysis of plates and shells, [31][32][33][34][35] crack propagation analysis, 36,37 fluid mechanics, 38 and dynamic analysis of tall buildings 39 are only few samples where the IGA has been successfully used. In addition, in recent years, many articles have focused on the space-time formulation of IGA as an alternative method to space-time FEM.…”

Section: Introductionmentioning

confidence: 99%

Weight‐adaptive isogeometric analysis for solving elastodynamic problems based on space‐time discretization approach

Izadpanah

Shojaee

Hamzehei‐Javaran

2019

Numerical Meth Engineering

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Summary In this paper, a novel adaptive isogeometric analysis (IGA) is introduced and its application in the numerical solution of two‐dimensional elastodynamic problems based on the space‐time discretization (STD) approach is studied. In the STD approach, the time is considered as an additional dimension and is discretized the same as the spatial domain. The weights of control points play the main role in the proposed method. In the conventional IGA, the same set of weights is used in the modeling of geometric and solution spaces. The idea is to define two groups of weights: geometric and solution weights. Geometric weights are known and can be determined based on the position of control points, but the solution weights are considered to be unknown and can be determined using a proper strategy so that the accuracy of the solution is optimized. This strategy is based on the minimization of an error function. The results obtained from the proposed method are compared with those obtained from the conventional IGA.

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Dynamic analysis of combined system of framed tube and shear walls by Galerkin method using B‐spline functions

Cited by 17 publications

References 25 publications

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

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

A new approach for free vibration analysis of nonuniform tall building structures with axial force effects

Weight‐adaptive isogeometric analysis for solving elastodynamic problems based on space‐time discretization approach

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