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Statistical extremes and peak factors in wind-induced vibration of tall buildings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第1期13卷 18-32页

作者： Ming-feng HUANG Chun-man CHAN Wen-juan LOU Kenny Chung-Siu KWOK Institute of Structural Engineering Zhejiang University Hangzhou 310058 China Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Hong Kong School of Engineering University of Western Sydney NSW Australia

In the structural design of tall buildings, peak factors have been widely used to predict mean extreme responses of tall buildings under wind excitations. Vanmarcke＇s peak factor is directly related to an explicit measure of structural reliability against a Gaussian response process. We review the use of this factor for time-variant reliability design by comparing it to the conven- tional Davenport＇s peak factor. Based on the asymptotic theory of statistical extremes, a new closed-form peak factor, the so-called Gamma peak factor, can be obtained for a non-Gaussian resultant response characterized by a Rayleigh distribution process. Using the Gamma peak factor, a combined peak factor method was developed for predicting the expected maximum resultant responses of a building undergoing lateral-torsional vibration. The effects of the standard deviation ratio of two sway components and the inter-component correlation on the evaluation of peak resultant response were also investigated. Utilizing wind tunnel data derived from synchronous multi-pressure measurements, we carried out a wind-induced time history response analysis of the Common- wealth Advisory Aeronautical Research Council （CAARC） standard tall building to validate the applicability of the Gamma peak factor to the prediction of the peak resultant acceleration. Results from the building example indicated that the use of the Gamma peak factor enables accurate predictions to be made of the mean extreme resultant acceleration responses for dynamic service- ability performance design of modem tall buildings.

关键词： Level-crossing rate (LCR) wind-induced vibration Mean extreme response Combined resultant process Peakfactor method

Experimental study and finite element analysis of wind-induced vibration of modal car based on fluid-structure interaction

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Journal of Hydrodynamics 2013年第1期25卷 118-124页

作者： TAO Li-li DU Guang-sheng LIU Li-ping LIU Yong-hui SHAO Zhu-feng School of Energy and Power Engineering Shandong University School of Automotive Engineering Shandong Jiaotong University

The wind-induced vibration of the front windshield concerns the traffic safety and the aerodynamic characteristics of cars. In this paper, the numerical simulation and the experiment are combined to study the wind-induced vibrations of the front windshield at different speeds of a van-body model bus. The Fluid-Structure Interaction （FSI） model is used for the finite element analysis of the vibration characteristics of the front windshield glass in the travelling process, and the wind-induced vibration response characteristics of the glass is obtained. A wind-tunnel experiment with an eddy current displacement sensor is carried out to study the deformation of the windshield at different wind speeds, and to verify the numerical simulation results. It is shown that the windshield of the model bus windshield undergoes a noticeable deformation as the speed changes, and from the deformation curve obtained, it is seen that in the accelerating process, the deformation of the glass increases as the speed increases, and with the speed being stablized, it also tends to a certain value. The results of this study can provide a scientific basis for the safety design of the windshield and the body.

关键词： Fluid-Structure Interaction (FSI) wind-induced vibration numerical simulation

Case Study of wind-induced vibration of a Cooling Tower Under Typhoon Environment

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第1期37卷 108-119页

作者： XING Yuan ZHAO Lin CHEN Xu GE Yaojun State Key Lab of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092P.R.China Key Laboratory of Transport Industry of wind Resistant Technology for Bridge Structures Tongji UniversityShanghai 200092P.R.China

As high-rise cooling towers are constantly emerging,wind effects on this kind of wind-sensitive structures have attracted more and more attention,especially in typhoon prone *** Type B turbulent flow fields under the normal wind and typhoon are simulated by active wind tunnel technology,and rigid-pressure-measurement model and aero-elastic-vibration-measurement model of a large cooling tower are *** stagnation point,peak suction point,separation point and leeward point of the throat position shell are selected to analyze pressure coefficient,probability distribution,peak factor,power spectral density and dynamic amplification factor under normal wind and *** is clarified that there exists a significant non-Gaussian characteristic under typhoon condition,which also exists in structural response *** response ratio of the total response is higher during typhoon *** maximum value of dynamic amplification coefficient under typhoon field is up to 1.18 times over that under normal *** findings of this study are expected to be of interest and practical use to professional and researchers involved in the wind-resistant designs of super-large cooling towers in typhoon prone regions.

关键词： cooling towers active wind tunnel non-Gaussian characteristic wind-induced vibration dynamic amplification coefficient

Passive Perforated Pipe Control Method for wind?induced vibration of a High?Rise Chemical Tower

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第1期37卷 99-107页

作者： LU Shanshan ZHANG Zhifu ZHANG Runtao CHEN Wenli Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090P.R.China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090P.R.China

Vortex-induced vibration is likely to occur when subjected to wind loads because of low horizontal stiffness,resulting in internal force and large lateral ***-term wind-induced vibration can not only affect the normal service and durability performance of chemical towers,but also seriously endanger the safety of towers in service periods,and cause property *** this study,a passive control method for suppressing wind-induced vibration of chemical towers is *** flow around the flow field is guided by a pre-set air-blowing channel,thus destroying the unsteady vortex shedding in the wake region of the flow field and achieving the purpose of flow *** accelerometers are used to measure the vibration signal of the chemical tower model with and without the perforated *** control effects of the spacing and the installation position of the perforated pipe are then *** results show that the passive perforated pipe control method can effectively reduce the vibration amplitude of the chemical tower under wind loads,and decrease the potential wind-induced vibration.

关键词： chemical tower wind-induced vibration pneumatic control

wind tunnel study on wind-induced vibration of middle pylon of Taizhou Bridge

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Engineering Sciences 2012年第3期10卷 77-80,92页

作者： Ma Rujin Zhang Zhen Chen Airong Department of Bridge Engineering Tongji University Shanghai 200092 China Norma Civihech Co. Ltd. Shanghai 200092 China

Full aero-elastic model tests are carried out to investigate wind-induced vibration of middle steel pylon of Taizhou Bridge. Model of the pylon under different construction periods is tested in both uniform and turbulent flow field. And the yaw angle of wind changes from transverse to longitudinal. Through full aero-elastic model testing, wind-induced vibration is checked, which includes vortex resonance, buffeting and galloping. Vortex resonance is observed and further studies are carried out by changing damping ratio. Based on wind tunnel testing results, wind-resistance of middle pylon is evaluated and some suggestions are given for middle pylon's construction.

关键词： wind tunnel test aero-elastic modeL wind-induced vibration middle pylon

Research on aerodynamic and wind-induced vibration characteristics of truck skirt based on fluid-solid coupling

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Research on aerodynamic and wind-induced vibration character...

Numerical Simulation Study of vibration Characteristics of Cantilever Traffic Signal Support Structure under wind Environment

第三十一届全国水动力学研讨会

作者： WANG Ze-wei HU Xing-jun LUO Yu-fei WANG Jing-yu ZHANG Jing-yin State Key Laboratory of Automotive Simulation and Control Jilin University

When the truck is driving in the complex alternating cross wind or gust conditions,the skirts on both sides of the container are affected by the alternating *** fatigue damage of the connection between the skirt and the container trends to occur,which threatens the driving safety of the ***,it is of considerable significance to study the wind-induced vibration characteristics of the truck skirt whether the crosswind *** this study,the flow field simulation under different working conditions by changing the transverse wind speed in the strong cross wind is investigated with the aid of the fluid structure coupling simulation method,so as to obtain the influence of the transverse wind speed on the wind-induced vibration of the *** results indicate that the low-frequency amplitude of skirt structure is an important index to measure the deformation of skirt structure under strong cross wind,and the change of cross wind speed has a great influence on the deformation of skirt structure.

关键词： Fluid-structure interaction Automotive aerodynamic wind-induced vibration Numerical simulation

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 673-698页

作者： Meng Zhang Zhichao Zhou Guifeng Zhao Fangfang Wang School of Civil Engineering Zhengzhou UniversityZhengzhou450001China Henan Vocational College of Mechanical and Electrical Zhengzhou451192China

Computational fluid dynamics(CFD)and the finite element method(FEM)are used to investigate the wind-driven dynamic response of cantilever traffic signal support structures as a *** building a finite element model with the same scale as the actual structure and performing modal analysis,a preliminary understanding of the dynamic properties of the structure is *** on the two-way fluid-structure coupling calculation method,the wind vibration response of the structure under different incoming flow conditions is calculated,and the vibration characteristics of the structure are analyzed through the displacement time course data of the structure in the crosswind direction and along-wind *** results show that the maximum response of the structure increases gradually with the increase of wind speed under 90°wind direction angle,showing a vibration dispersion state,and the vibration response characteristics are following the vibration phenomenon of galloping;under 270°wind direction angle,the maximum displacement response of the structure occurs at the lower wind speed of 5 and 6m/s,and the vibration generated by the structure is vortex vibration at this time;the displacement response of the structure in along-wind direction increaseswith the increase of wind *** along-wind displacement response of the structure will increase with increasing wind speed,and the effective wind area and shape characteristics of the structurewill also affect the vibration response of the structure.

关键词： Signal structure modal analysis wind-induced vibration two-way fluid-structure interaction numerical simulation

Dynamic performance of cable-stayed bridge tower with multi-stage pendulum mass damper under wind excitations——I:Theory

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Earthquake Engineering and Engineering vibration 2007年第4期6卷 295-306页

作者：郭安薪徐幼麟李惠 School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong China

In this paper, wind-induced vibration control of a single column tower of a cable-stayed bridge with a multi- stage pendulum mass damper （MSPMD） is investigated. Special attention is given to overcoming space limitations for installing the control device in the tower and the effect of varying natural frequency of the towers during construction. First, the finite element model of the bridge during its construction and the basic equation of motion of the MSPMD are introduced. The equation of motion of the bridge with the MSPMD under along-wind excitation is then established. Finally, a numerical simulation and parametric study are conducted to assess the effectiveness of the control system for reducing the wind-induced vibration of the bridge towers during construction. The numerical simulation results show that the MSPMD is practical and effective for reducing the along-wind response of the single column tower, can be installed in a small area of the tower, and complies with the time-variant characteristics of the bridge during its entire construction stage.

关键词： multi-stage pendulum mass damper cable-stayed bridge single column tower wind-induced vibration

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

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Frontiers of Structural and Civil Engineering 2009年第2期3卷 173-179页

作者： Zhengqing CHEN wind Engineering Research Center Hunan UniversityChangsha 410083China

Flutter derivatives are essential for flutter analysis of long-span bridges,and they are generally identified from the vibration testing data of a sectional model suspended in a wind *** use of the forced vibration testing data of three sectional models,namely,a thin-plate model,a nearly streamlined model,and a bluff-body model,a comparative study was made to identify the flutter derivatives of each model by using a time-domain method and a frequency-domain *** was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domain method and time-domain method,respectively,agree very ***,some of the flutter derivatives of each of the other two models identified with the two methods deviate to some *** precisely,the frequency-domain method usually results in smooth curves of the flutter *** formulation of time-domain method makes the identification results of flutter derivatives relatively sensitive to the signal phase lag between vibration state vector and aerodynamic forces and also prone to be disturbed by noise and nonlinearity.

关键词： long-span bridges wind-induced vibration flutter derivatives forced vibration test time-domain method frequency-domain method