Lateral drift constrained structural optimization of an actual supertall building acted by wind load

Summary High frequency force balance (HFFB) technique is one of the most widely used approaches for estimating wind effects on super‐tall buildings. The traditional method for computing the equivalent static wind load (ESWL) of HFFB wind tunnel tests usually separately calculates the background ESWL and resonant ESWL and then combines them by using the square root of the sum of the squares method. This method neglects the correlation between the background response and resonant response and consequently provides inaccurate ESWL results. By analyzing the mechanism of the correlation, this paper proposed an improved method by adding an item to the traditional equation to represent such correlation. Two super‐tall building cases, the Guangzhou East Tower (530 m) and the Guangzhou West Tower (432 m), were investigated to examine the validity of the proposed method. Compared with the traditional method, the proposed method provides much more accurate results. The simple but effective method is helpful to researchers and engineering in investigating the wind effects on super‐tall buildings based on HFFB wind tunnel tests.

Section: Response Computation For a Hffb Wind Tunnel Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

See 2 more Smart Citations

Improved combination method of background component and resonant component of wind loads on high‐rise buildings

Zhao

2018

“…[1,2] There are several major ways to improve the wind-resistant performance of a tall building after completing its preliminary architectural and structural design, such as by locally changing the building shape to optimize its aerodynamic characteristics, [3,4] by installing damping system to reduce the response to dynamic loads, or by optimizing the cross-sectional sizes of structural members to reduce its response to wind excitations. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] Compared with the first two approaches, the structural optimization method does not require any change of the building shape or structural system and any expenses for adding and maintaining any additional damping system, and so the structural optimization method has now been widely accepted by researchers and engineers in the structural design of tall buildings. [5,13,16] Studies [9][10][11][12][13][14][15][16][17] have shown that the constructional material cost of a tall building can be effectively reduced by the structural optimization.…”

mentioning

confidence: 99%

A new method for frequency constrained structural optimization of tall buildings under wind loads

et al. 2018

Self Cite

Summary Tall buildings are usually sensitive to wind loads, and effective and accurate methods for the wind‐resistant structural optimal design of tall buildings have become a widely concerned problem. Conventionally, the frequency constraint for the structural optimal design of a tall building is formulated through the strain energy method, and with the objective functions and constraint functions being established, the structural optimization problem is mathematically modeled, and the corresponding solution is solved using the optimal criteria (OC) method. This procedure has two disadvantages. First, the strain energy usually does not consider the gradient of the structural internal forces to the design variables, and so the computed sensitivity of the frequency constraint is inaccurate. Second, in the OC method, the Lagrangian multipliers are computed by solving a set of linear equations using the Gauss–Seidel method, which may lead to inaccurate results. To overcome these disadvantages, a new method is proposed by using an eigenvalue approach for computing the sensitivity of the frequency constraint and a quadratic programming approach for computing the Lagrangian multipliers. It is shown that the proposed new method can perform accurate wind‐resistant structural optimal design for tall buildings and make the iterations of the optimal design converge faster and more stable.

Optimum seismic design of steel framed‐tube and tube‐in‐tube tall buildings

Sarcheshmehpour

Estekanchi

Moosavian

2020

Summary The relatively large number of structural elements and the variety of design code requirements complicate the design process of tall buildings. This process is exacerbated when the target is to obtain the seismic code‐compliant optimal design with minimum weight. The present paper aims at providing a practical methodology for the optimal design of steel tall building structures considering the constraints imposed by typical building codes. The applicability of the proposed approach is demonstrated through the determination of the optimal seismic design for 20‐, 40‐, and 60‐story buildings with a framed tube as well as a tube‐in‐tube system. Such a design gives rise to a basis for the fair comparison of the behavior of the framed tube with that of the tube‐in‐tube system under applied loads. The optimal weight of the buildings with the tube‐in‐tube system turns out to be slightly less than that of the buildings with the conventional framed‐tube system.