Abstract
Prestressed, cable-supported flexible photovoltaic (PV) arrays exhibit nonlinear aeroelastic behavior due to array
interference effects, which are often oversimplified in engineering designs. This study investigates a three-span, five-row
prestressed cable-supported PV array using a comprehensive aeroelastic model, which incorporates an equivalent stiffness PV
section and a reduced-prestress wire rope. Additionally, a low-interference synchronous vibration and force measurement system
was developed, combining an orthogonal arrangement of high-speed cameras and tensile sensors. Using the fully aeroelastic
similarity model, this research systematically analyzes wind-induced self-excited vibrations in both single-span and multi-span
PV arrays, while capturing the effects of array interference. The gust response factors of the cable-supported PV array were
quantified, and three wind-resisting cable measures were proposed and experimentally evaluated. Results show that the fully
aeroelastic model effectively captures both interference and aeroelastic effects. The measurement system enabled low
interference, synchronous analysis of 3D aeroelastic responses. The cable-supported PV array maintained structural integrity
across all row supports, with no critical wind velocity identified in any wind direction. The maximum recorded gust response
factors were 1.371 for the single span, 1.381 at the midspan of the 3 x 5 array, and 1.376 at the side span of the 3 x 5 array. All
three proposed wind-resisting measures successfully reduced vibration amplitude, achieving a maximum reduction of 6.63% in
the gust response factor.
Address
Hongxin Wu:1)Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,
Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
2)Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Shitang Ke:1)Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,
Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
2)Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Hehe Ren:Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Qingge Cai:Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Wenxin Tian:Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Tongguang Wang:Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,
Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
Abstract
Tall buildings are sensitive to wind loads, with significant wind-induced vibrations reducing comfort. Based on the
example of the DY03-07 project in Taiziwan, Shenzhen, this study examines the variable damping characteristics of TMD
(Tuned Mass Damper) systems. Wind tunnel experiments were conducted to obtain wind loading data under various recurrence
intervals, including frequent and rare conditions. The wind-induced comfort in tall structures is then analyzed using a serial
multi-degree-of-freedom simplified model. The results demonstrate that the model can effectively simulate the vibration
response of tall structures. Under frequent wind loading, the TMD system exhibits an optimal frequency ratio of 0.98 and a
damping ratio of 15%. Under rare wind loading, with a VDTMD (Variable Damping Tuned Mass Damper) system having a
c2/c1 ratio of 6, the maximum relative displacement between the VDTMD system and the top structure is 990mm, meeting the
specified limit requirements. Under frequent wind loading, the addition of VDTMD+VFD (Viscous Fluid Damper) reduces the
peak acceleration of the top structure to 0.143 m/s2, meeting the comfort requirements. Simultaneously, under rare loading wind
conditions, the maximum story drifts is 1/1195, indicating a significant reduction in vibration effects.
Key Words
comfort control; tall buildings; VDTMD; VFD; wind-induced motion
Address
Junyi Zhang:Southeast University, No.2, Southeast University Road, Nanjing, 211189, Jiangsu, China
Yijing Lu:Southeast University, No.2, Southeast University Road, Nanjing, 211189, Jiangsu, China
Zhiqiang Zhang:1)Southeast University, No.2, Southeast University Road, Nanjing, 211189, Jiangsu, China
2)State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd, Nanjing, 210011, Jiangsu, China
Qiang Hong:State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd, Nanjing, 210011, Jiangsu, China
Abstract
The understanding and research on the wind field characteristics of downbursts and the wind loads on structures
under their influence have emerged as pivotal research topics in wind engineering. This paper employs a simulator to generate
downburst winds and investigates the wind load characteristics on the surface of a large-span steel structure factory building
under such conditions. Initially, based on the theory of impinging jet, a downburst wind field is generated, revealing the spatial
distribution patterns of wind speed, wind direction, and wind pressure. The validation of the simulated wind field is confirmed
by comparing experimental results with measurements and theoretical models. Subsequently, the wind load characteristics of the
factory building model are studied under the influence of downbursts by varying the radial distance of the downburst, wind
direction angle and ground surface roughness. The results indicate that within the core region of the downburst, the model is
primarily impacted by high pressure, resulting in relatively large positive surface wind pressures and forces. Conversely, in the
horizontal diffusion area of the downburst, the model is predominantly influenced by horizontal wind speeds. Specifically, near
the radial distance of the diameter of the simulator, the maximum negative pressure emerges at the leading edge of the roof's
windward side, corresponding to the occurrence of the maximum lift force, lateral force, and overturning moment. In addition,
higher roughness substantially elevates the wind pressure and wind force coefficients on the factory.
Key Words
downburst; steel structure factory; wind load characteristics; wind pressure coefficient; wind tunnel test
Address
Shi Zhang:School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture,
No.1 Zhanlanguan Road, Xicheng District 100044 Beijing, China
Kexin Guo:School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture,
No.1 Zhanlanguan Road, Xicheng District 100044 Beijing, China
Xiaoda Xu:Academician Bin Zeng Studio, Central Research Institute of Building and Construction Co., Ltd. MCC,
No.33 Xitucheng Road, Haidian District 100088 Beijing, China
Qingshan Yang:School of Civil Engineering, Chongqing University, No. 83 Shabei Street, Shapingba District, 400045 Chongqing, China
Zengzhi Qian:China Railway Construction Group Co., No. 20 Shijingshan Road, Shijingshan District, 100040 Beijing,China
Daxing Zhou:China Railway Construction Group Co., No. 20 Shijingshan Road, Shijingshan District, 100040 Beijing,China
Yuji Tian:School of Civil Engineering, Beijing Jiaotong University, No. 3 Shangyuan Village, Haidian District 100044 Beijing, China
Abstract
In solar power technology, flexible cable-supported photovoltaic (PV) systems (FCSPSs) have become a viable
alternative to conventional ground-mounted PV supports. These systems feature extended spans, a lightweight structure, and
strong load-bearing capacity, making them notably resilient. Their flexibility is particularly beneficial in difficult environments
such as mountainous areas, fish ponds, and sewage treatment facilities. Understanding the wind-induced vibration coefficient is
crucial for accurately predicting how FCSPSs will respond to varying wind conditions. Due to the significant deformation
caused by wind in FCSPSs, it's vital to perform a fluid-structure interaction (FSI) analysis to determine this coefficient. This
study conducts a series of two-way FSI Computational Fluid Dynamics (CFD) simulations to examine how the initial pre
tension force in steel cables affects the wind-induced vibration response of FCSPSs. First, modal analysis cases are performed
with different initial tension forces in the steel cables. Next, the transient response of the cable-support structure and the changes
in the wind field under load are assessed. Finally, the wind-induced vibration coefficient for both displacement and support
reaction in the FCSPS is quantitatively evaluated. The results indicate that as initial pre-tension increases, the natural period and
the reaction force's wind-induced vibration coefficient decrease, while the displacement wind-induced vibration coefficient rises.
These findings offer valuable guidance for optimizing pre-tension to reduce wind-induced vibrations, thereby improving the
stability and efficiency of FCSPSs.
Abstract
Wind load is the main load affecting the ropeway safety, making it imperative to comprehend the wind-induced
vibration characteristics of the entire system for its secure operation. This study focuses on the Songhua River passenger
ropeway, where an integrated approach of field measurements and numerical simulations was employed to study the wind
induced vibration of the ropeway system. Results show that the periodic rolling and yawing are the predominant attitudes of the
cable car during motion. And the longitudinal acceleration is greater than the lateral acceleration. In the same wind direction, the
relationship between the displacement of the ropeway tower top and the mean wind speed can be expressed as a quadratic
function. During cable car operation, the lateral displacement of the tower top increases by over 40%, while the longitudinal
displacement increased by 1.4 to 3.45 times. The lateral swing of the cables gave the tower a load spectrum with its own self
oscillation dominant frequency. Compared with the single tower, the vibration frequency of the ropeway tower in the direction
of the cable increases by 44.53% in the tower-cable system of the Songhua River ropeway. Based on the cable car operation load
calculation model, the most unfavorable calculation result of the Songhua River ropeway tower displacement is 1.05~1.34 times
the measured values.
Key Words
attitude angle; field measurements; passenger cable car; ropeway tower; wind-induced vibration
Address
Furui Tian:School of Civil Engineering, Harbin Institute of Technology, 150001, Harbin, China
Zhenyu Wu:1)School of Civil Engineering, Harbin Institute of Technology, 150001, Harbin, China
2)School of Civil Engineering and Architecture, Hainan University, 570228, Haikou, China
Wentong Zhang:School of Civil Engineering and Architecture, Hainan University, 570228, Haikou, China
Haixin Jiang:School of Civil Engineering and Architecture, Hainan University, 570228, Haikou, China
Dabo Xin:School of Civil Engineering and Architecture, Hainan University, 570228, Haikou, China
