Showing papers by "Qiusheng Li published in 2021"
TL;DR: In this article, the aerodynamic pressure on a 5:1 rectangular cylinder in sinusoidal streamwise oscillatory flows (SSOFs) with non-zero mean velocities are studied through wind tunnel experiments.
14 citations
13 citations
12 citations
TL;DR: In this paper, the authors investigated the usability of recurrence analysis for diagnosing hidden structures in wind speed dynamics, in which nonlinear dynamic analysis techniques, namely, recurrence plot (RP) and recurrence quantification analysis (RQA), were implemented on the wind speeds measured at several surface stations in Hong Kong.
11 citations
TL;DR: This poster presents a probabilistic procedure for estimating the intensity of earthquake-triggered landsliding in China and its effects on infrastructure.
Abstract: Department of Civil Engineering, University of Birmingham, Birmingham, UK Hong Kong Observatory, Kowloon, Hong Kong Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong Joint Research Centre for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou, China Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, School of Civil Engineering, Chongqing University, Chongqing, China
11 citations
TL;DR: In this article, the influence of track irregularity and deck deformation on the running safety of high-speed railway (HSR) trains is investigated, with emphasis placed on those caused by the creep of continuous pr...
Abstract: The influence of track irregularity and deck deformation on the running safety of high-speed railway (HSR) trains is investigated, with emphasis placed on those caused by the creep of continuous pr...
11 citations
11 citations
TL;DR: In this paper, the authors investigated the impact of Super Typhoon Mangkhut on Hong Kong, especially the wind effects on high-rise buildings, based on 24-h-long field measurement records collected from three different locations.
Abstract: This paper investigates the impact of Super Typhoon Mangkhut on Hong Kong, especially the wind effects on high-rise buildings, based on 24-h-long field measurement records collected from th...
11 citations
TL;DR: In this article, the concept of cluster analysis was extended for wind pressure coefficient (WPC) partitioning of large-span roofs, in which a fast partition method based on the modified GK clustering algorithm was employed to partition the WPC on two engineering cases, i.e., a cantilever flat roof and a curved roof.
10 citations
TL;DR: In this article, the behavior of transmission lines under strong winds has been investigated in numerous studies, and the authors concluded that transmission lines are vulnerable to wind actions and that wind-prone transmission lines can cause significant damage to transmission lines.
Abstract: Transmission lines (TLs) are vulnerable to wind actions. Notwithstanding the fact that the behavior of transmission lines under strong winds has been investigated in numerous studies, wind-...
10 citations
TL;DR: In this article, the authors analyzed the wind pressure on the claddings of a 600-m-high skyscraper in Shenzhen, China, during Super Typhoon Mangkhut on September 16, 2018.
Abstract: This paper analyzes the wind pressures on the claddings of a 600-m-high skyscraper in Shenzhen, China, during Super Typhoon Mangkhut on September 16, 2018. A synchronous monitoring system t...
TL;DR: In this paper, the variability of vertical wind velocity in the context of fractal dimension analysis was investigated, and it was shown that the time series of wind velocity are monofractals and weak anti-persistent.
TL;DR: In this paper, a full-scale experimental low-rise building with gable roof was constructed in a typhoon-prone area in China, aiming to study the wind effects on a typical lowrise building during tropical cyclones.
TL;DR: In this paper, the authors examined the variation of the gust factor with wind speed and observed that for 1-min mean wind speeds between 10 and 70 m/s, the gust factors initially increased with increasing wind speed, and plateaued at wind speed between 30 and 50 m /s before exhibiting a decreasing trend until 70 m / s.
TL;DR: In this paper, the unsteady lift of an oscillating airfoil encountering a sinusoidal streamwise gust is experimentally investigated, and the results indicate that the experimental results agree generally well with Greenberg's prediction, while there is a small deviation.
Abstract: The unsteady lift of an oscillating airfoil encountering a sinusoidal streamwise gust is experimentally investigated. The sinusoidal streamwise gust is generated by a multiple-fan actively controlled wind tunnel. A two-dimensional airfoil with a NACA0015 profile oscillates in the wind tunnel with a pitch motion frequency of . The results of all cases indicate that the experimental results agree generally well with Greenberg's prediction, while there is a small deviation.
TL;DR: In this article, a lidar-based observational analysis of sea-surface roughness length at a coastal site in Hong Kong, in which the wind data recorded from March 2012 to November 2015 were considered and analyzed.
Abstract: Sea-surface roughness length is a key parameter for characterizing marine atmospheric boundary layer. Although aerodynamic roughness lengths for homogeneous land and open water surfaces have been examined extensively, the extension of relevant knowledge to the highly inhomogeneous coastal area is problematic due to the complex mechanisms controlling coastal meteorology. This study presented a lidar-based observational analysis of sea-surface roughness length at a coastal site in Hong Kong, in which the wind data recorded from March 2012 to November 2015 were considered and analyzed. The results indicated the turning of wind near the land-sea boundary, leading to a dominative wind direction parallel to the coastline and an acceleration in wind. Moreover, the roughness lengths corresponding to two representative azimuthal sectors were compared, in which the roughness lengths for the onshore wind sector (i.e., 120°–240°) appear to be larger than the constant value (z0 = 0.2 mm) recommended in much existing literature, whereas the values for the alongshore wind sector (i.e., 60°–90°) are significantly smaller, i.e., about two orders of magnitude less than that of a typical sea surface. However, it is to be noted that the effect of atmospheric stability, which is of crucial importance in governing the marine atmospheric boundary layer, is not taken into account in this study.
TL;DR: In this paper, the authors investigated the wind effects on a 420-meter-tall building located in Hong Kong by full-scores and found that the wind effect on high-rise buildings has always been a major concern in structural engineering.
Abstract: Wind effects on high-rise buildings have always been a major concern in structural engineering. This paper investigates the wind effects on a 420-meter-tall building located in Hong Kong by full-sc...
TL;DR: Based on the 356m-high Shenzhen Me... as discussed by the authors, the vast majority of current structural design codes and standards do not separately consider the wind and turbulence profiles for different storm types.
Abstract: The vast majority of current structural design codes and standards do not separately consider the wind and turbulence profiles for different storm types. Based on the 356-m-high Shenzhen Me...
TL;DR: In this article, the structural accelerations of two monitored skyscrapers measured during Super Typhoon Mangkhut (1822) are presented, based on the measured acceleration data, building modal parameters, including natural frequencies and damping ratio, are identified and they generally agree with the predicted values by the finite element modelling (FEM) or are within the expectation of their assumed values at the design stage.
Abstract: This paper analyzes the field measurement data of wind-excited vibration responses of two skyscrapers (393 and 432 m in height) during Super Typhoon Mangkhut (1822), and utilizes such measurement data to validate the design parameters adopted in both buildings. In this paper, the structural accelerations of the two monitored skyscrapers measured during Mangkhut are presented. Based on the measured acceleration data, building modal parameters, including natural frequencies and damping ratio, are identified and they generally agree with the predicted values by the finite element modelling (FEM) or are within the expectation of their assumed values at the design stage. Furthermore, the amplitude dependencies of the parameters are estimated by the random decrement technique, and the results show that the fundamental frequencies slightly decrease with the vibration amplitude, which may be attributed to the P-Delta effect according to the similar trend revealed by the FEM results, whereas no evident varying trend of damping ratios is demonstrated. The study also identifies the beating effect existing in the monitored building response signals, investigates its impact on modal parameter identification and discusses the correlation between the beating effect and the structural modal characteristics. Finally, the root-mean-square structural accelerations of one of the two buildings are re-calculated based on the wind tunnel test data and the measured building modal parameters, and their comparison with the in situ measurements demonstrates a reasonable agreement.
TL;DR: In this paper, the authors presented a comprehensive investigation of various meteorological variables (i.e., wind speed and direction, air temperature, pressure and relative humidity) using a 30-yr field measurement database available at 8 weather stations across Hong Kong, with particular emphasis on the characterization of the hidden periodic oscillation.
TL;DR: 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 and is applied to modal identification based on field measured non- stationary responses of a high-rise building during Typhoon Nida.
Abstract: 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 m...
TL;DR: In this paper, the authors systematically study the across-wind loads of rectangular-shaped tall buildings with aerodynamic modifications and propose refined mathematic models accordingly, taking into account the aerodynamic properties of the buildings.
Abstract: This paper aims to systematically study the across-wind loads of rectangular-shaped tall buildings with aerodynamic modifications and propose refined mathematic models accordingly. This study takes...
TL;DR: In this paper, the authors presented a comprehensive field study on this special typhoon, based on extensive in-situ measurements collected by radiosonde balloons, wind profilers and surface-based meteorological masts at various stations around Hong Kong.
TL;DR: In this article, a 1/100 scale model of a cantilevered roof, over a grandstand, has been tested in a turbulent boundary layer flow, with particular emphasis on characterizing the wind pressure distribution on the roof, and assessing the performance of several aerodynamic optimization devices.
TL;DR: In this article, a 1:20 scaled model of a typical 3D wind turbine blade is designed and used for the pressure measurement of turbulence intensity on wind turbine blades, and the authors investigate the effect of turbulence on wind loads on wind turbines.
Abstract: For investigation of the effects of turbulence intensity (TI) on the wind loads on wind turbine blade, a 1:20 scaled model of a typical 3D wind turbine blade is designed and used for the pressure m...
TL;DR: In this paper, the surface pressure and flow structures around a 5:1 rectangular cylinder under the effects of sinusoidal vertical gusts in separated and reattaching flows are studied through wind tunnel experiments by pressure and particle image velocimetry (PIV) measurements.
Abstract: The effects of turbulence on separated and reattaching flows around rectangular cylinders have been extensively studied. However, less knowledge exists regarding the effects of oscillatory gusts on separated and reattaching flows. In this paper, the surface pressures on and the flow structures around a 5:1 rectangular cylinder under the effects of sinusoidal vertical gusts in separated and reattaching flows are studied through wind tunnel experiments by pressure and particle image velocimetry (PIV) measurements. The results show that the effects of gust amplitudes are more pronounced than those of reduced gust frequencies. As the gust amplitude increases, the maximum of the RMS pressure coefficient (
$$\tilde{C}_{p}$$
) increases and the size of the separation bubble reduces remarkably. Additionally, the dominant spanwise correlated regions on the upper and lower surfaces of the cylinder become broader at different attack angles. The analysis of the pressure measurements demonstrates that the pressure fluctuations are mainly generated from the periodic oscillations of gust velocities, which makes the maximum of $$\tilde{C}_{p}$$
insensitive to the change of attack angle. Meanwhile, the interactions between the pressure fields excited by gusts and separated and reattaching flows may result in relatively smaller maximums of $$\tilde{C}_{p}$$
on the upper surface in the sinusoidal vertical gusts compared with those on the lower surface at large attack angles. The PIV measurement results show that the turbulent kinetic energy increases under the effects of sinusoidal vertical gust. In addition, the impingement of shear layers and the vortex swirling strength become more intense with the increased gust amplitude.
TL;DR: Based on the multi-level, high-resolution observations from Asia's tallest meteorological tower, the 356m-high Shenzhen Meteorological Gradient Tower, the authors investigates the characteristics and vertical profiles of vertical eddy diffusivity and mixing length during two landfalling typhoons, namely Super Typhoons Mangkhut and Hato.