Practical Recommendations for Controlling of Angular Displacements of High-Rise and Large Span Elements of Civil Structures

Proposals for forming various types of bar space structures, which could be used as building structures of different functional purposes are the subjects of this paper. The systems proposed have been developed with the aim of applying them in the design of structural systems for large span covers and high-rise buildings. The essential aims of forming large span cover structures is to obtain systems which would allow building these covers using relatively short bars. In the paper some new configuations of such space structures are presented. The most important factor in the design of the structural system of a tall building is the need to provide a comparatively slender structure with appropriate great rigidity. Some proposals of application of space structures as structures of high-rise buildings are presented in the paper.

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Identification of modal parameters from non-stationary responses of high-rise buildings

Advances in Structural Engineering ◽

10.1177/13694332211033959 ◽

2021 ◽

pp. 136943322110339

Author(s):

Lunhai Zhi ◽

Feng Hu ◽

Qiusheng Li ◽

Zhixiang Hu

Keyword(s):

Damping Ratio ◽

Modal Identification ◽

Frame Structure ◽

Modal Parameters ◽

Strong Wind ◽

Modal Parameter ◽

Civil Structures ◽

High Rise ◽

Random Decrement Technique ◽

Structural Responses

A key issue in the control, health monitoring, and condition assessment of civil structures is the estimation of structural modal parameters based on measured structural responses. However, field measurements of structural responses from civil structures under strong wind or earthquake excitations usually exhibit non-stationary feature and therefore cannot be adequately deal with by traditional modal identification methods. In this study, a novel procedure is integrated for modal parameter identification of civil structures from non-stationary structural responses on the basis of the variational mode decomposition (VMD) technique. First, the VMD algorithm is applied to decompose measured vibration signals into individual mode components. Then, the random decrement technique (RDT) is employed to obtain free vibration response of each mono component. Next, normalized Hilbert transform (NHT) is used to estimate modal natural frequency and damping ratio. The performance of the developed approach is evaluated using simulated non-stationary responses of a frame structure, and the identified results are validated. The effects of crucial factors such as levels of noise involved in structural response and data length on the modal parameter estimations are examined through detailed parametric study. Furthermore, the approach is applied to modal identification based on field measured non-stationary responses of a high-rise building during Typhoon Nida. The case study illustrates that the integrated method is an efficient tool for estimating the modal parameters of civil structures from non-stationary structural responses.

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Shaking table test and evaluation of a novel high-rise large span concrete cassette structure

Engineering Structures ◽

10.1016/j.engstruct.2021.112205 ◽

2021 ◽

Vol 238 ◽

pp. 112205

Author(s):

Zhi-Peng Chen ◽

De-Cheng Feng ◽

Ke-Jian Ma ◽

Gang Wu

Keyword(s):

Shaking Table Test ◽

Shaking Table ◽

Large Span ◽

High Rise ◽

Test And Evaluation

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Entropy algorithms for detecting incipient damage in high-rise buildings subjected to dynamic vibrations

Journal of Vibration and Control ◽

10.1177/1077546320929145 ◽

2020 ◽

pp. 107754632092914

Author(s):

Juan P Amezquita-Sanchez

Keyword(s):

Damage Detection ◽

Shannon Entropy ◽

Approximate Entropy ◽

Sample Entropy ◽

Permutation Entropy ◽

Civil Structures ◽

Entropy Methods ◽

High Rise ◽

High Rise Building ◽

Different Levels

Civil structures are considered vital elements to the society and economy, but they are susceptible to different kinds of damage during their lifetime. Hence, the development of methodologies capable of assessing the condition of civil structures is of paramount importance. In this work, a new entropy-based methodology for detecting incipient damage in a high-rise building subjected to dynamic vibrations is presented. As different entropy methods have been introduced in the literature, the most representative entropy methods, Shannon entropy, Renyi entropy, approximate entropy, sample entropy, permutation entropy, and dispersion entropy, are investigated for evaluating their performance for damage detection. For performing this task, the vibrational responses measured in the high-rise building to different levels of damage are analyzed.

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Construction of Large-Span Twin Tunnels Below a High-Rise Transmission Tower: A Case Study

Geotechnical and Geological Engineering ◽

10.1007/s10706-013-9726-3 ◽

2014 ◽

Vol 32 (2) ◽

pp. 453-467 ◽

Cited By ~ 7

Author(s):

Shuying Wang ◽

Junsheng Yang ◽

Yuanhong Yang ◽

Fangping Zhong

Keyword(s):

Transmission Tower ◽

Large Span ◽

High Rise ◽

Twin Tunnels

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A Study on the Fluctuating Pressure Correlation of a Cantilevered Elliptic Annular Roof Structure

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455416400137 ◽

2016 ◽

Vol 16 (01) ◽

pp. 1640013

Author(s):

Zhaohui Chen ◽

Yi Sun ◽

Haiyong Zhang ◽

Zhaohui Zhang

Keyword(s):

Coherence Function ◽

Wind Tunnel Test ◽

Fluctuating Pressure ◽

Large Span ◽

High Rise ◽

Roof Structure ◽

Inflow Turbulence ◽

Rigid Model ◽

Wind Pressures ◽

Flat Roof

A wind tunnel test on a large-span cantilevered elliptical annular roof was carried out. The time series of wind pressures were tested simultaneously on the upper and lower surfaces of a roof structure rigid model, that was exposed to open and suburban boundary layer air flows in various wind directions. The spatial correlation characteristics of fluctuating pressures on the roof structure were analyzed. Both the analyzing results of the correlation coefficient in time domain and the coherence function in frequency domain indicated that the correlation structure of the fluctuating pressure of a large-span roof is sensitive to the location of the investigated taps, the roof geometry, the wind direction, and the inflow turbulence. Therefore, the simulation methodology, using a single coherence function, based on the spatial interval of two taps, ignoring the geometry characteristics and the particular tap locations on the roof, a method commonly used in wind load simulations for high-rise and flat roof structures, is shown to not be appropriate for large-span cantilevered roof structures. This quasi-steady approach cannot be employed to evaluate large-span roof structures.

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Calculation and Application of Steel-Concrete Composite Beams Stiffness Amplified Coefficient

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.1187 ◽

2013 ◽

Vol 405-408 ◽

pp. 1187-1190

Author(s):

Zai Gen Mu ◽

Jing Cheng ◽

Zhong Fan

Keyword(s):

Steel Structure ◽

Composite Beams ◽

Large Span ◽

High Rise ◽

Practical Engineering ◽

Plastic Stage ◽

Formula Derivation ◽

Effective Flange Width ◽

The Impact ◽

Elastic Stage

Steel-concrete composite beams have been widely used in the high-rise buildings and large span steel structure. Composite beams effective flange width has been further investigated in domestic, as well as the force and deformation within elastic stage and plastic stage. In this paper, we give out the formula derivation of steel-concrete composite beams stiffness amplified coefficient. Combined with a practical engineering, we analysis the impact of stiffness amplified coefficient on the whole structure by SAP2000 software and compare the results back and forth. In the end, we put forward some suggestions for construction engineers.

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