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学者姓名：李栋
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Abstract ：
Under typhoon attack, slender and lightly damped offshore wind turbine systems are prone to significantly exacerbated aeroelastic dynamic responses and increased structural instability risks, potentially leading to damage or collapse. To address the complex vibration challenges in multi-mode and multi-directional systems, this paper proposes a dual-track nonlinear energy sink (NES) and establishes a theoretical model for the wind turbine tower system coupled with the dual-track NES, incorporating blade rotation and vortex shedding effects. A comprehensive optimization of the dual-track NES is conducted to determine the optimal track profiles and damping ratios. An aeroelastically scaled model of the wind turbine tower system is designed and tested in typhoon fields simulated in wind tunnels. The effectiveness of the dual-track NES is evaluated under various conditions by analyzing acceleration time-history responses, displacement trajectories, frequency, and damping ratios. Experimental results demonstrate that the dual-track NES can effectively suppress the tower's response in both alongwind and crosswind directions, with the displacement trajectory significantly narrowed, eigenvalues of displacement power spectral density reduced in orders, and damping ratio increased up to five times. Notably, under resonance conditions, the acceleration response is reduced by up to 97.1%, while in non-resonance conditions, the reduction can reach up to 79.4%. This innovative approach provides a promising solution for mitigating typhoon-induced multimodal resonances and avoiding dynamic instabilities in offshore wind turbine systems.
Keyword ：
Energy dissipation Energy dissipation nonlinear energy sink nonlinear energy sink structural dynamics structural dynamics wind tunnel tests wind tunnel tests wind turbine tower wind turbine tower
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| GB/T 7714 | Li, Dong , Fang, Shijing , Zhang, Zhengyu et al. Dual-Track Nonlinear Energy Sinks for Mitigating Bi-Directional Vibration of Wind Turbine Towers in Typhoons [J]. | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2025 . |
| MLA | Li, Dong et al. "Dual-Track Nonlinear Energy Sinks for Mitigating Bi-Directional Vibration of Wind Turbine Towers in Typhoons" . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS (2025) . |
| APA | Li, Dong , Fang, Shijing , Zhang, Zhengyu , Wu, Keda , Zhao, Jie , Dai, Yiqing . Dual-Track Nonlinear Energy Sinks for Mitigating Bi-Directional Vibration of Wind Turbine Towers in Typhoons . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2025 . |
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Steel-ultra-high performance concrete (UHPC) composite walls can use high-strength tie bars (HBs) as shear connectors to satisfy the increased requirement of interfacial shear resistance. However, there is a lack of research on the shear behavior of HBs embedded in UHPC. To address it, this paper conducts 33 push-out tests, considering the effects of the following six parameters: yield stress and thickness of steel plates, yield stress and diameter of tie bars, and compressive strength and fiber content of concrete. Test results demonstrate that: (i) the failure modes include shear failure of tie bars (for specimens using UHPC with steel fibers) and splitting failure of concrete (for the other specimens), these are different from the traditional failure modes of shear studs embedded in conventional-strength concrete and should be considered in design; and (ii) using UHPC or using tie bars with higher yield stress or larger diameters can remarkably improve the shear strength. The applicability of current design equations to estimate the shear strength of HBs embedded in concrete is also evaluated. It is shown that the accuracy of current design equations depends on the governing failure mode. When tie bar shear failure governs, AASHTO LRFD (AASHTO 2012) can accurately estimate the strength, while the other equations are quite conservative; when concrete splitting failure governs, all equations seem unconservative as they are based on concrete compression failure.
Keyword ：
High-strength High-strength Push-out test Push-out test Shear stiffness Shear stiffness Shear strength Shear strength Tie bar connector Tie bar connector UHPC UHPC
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| GB/T 7714 | Lai, Zhichao , Weng, Xiangyu , Li, Dong et al. Shear behavior of high-strength tie bar connectors embedded in UHPC [J]. | STRUCTURES , 2025 , 72 . |
| MLA | Lai, Zhichao et al. "Shear behavior of high-strength tie bar connectors embedded in UHPC" . | STRUCTURES 72 (2025) . |
| APA | Lai, Zhichao , Weng, Xiangyu , Li, Dong , Li, Langfu . Shear behavior of high-strength tie bar connectors embedded in UHPC . | STRUCTURES , 2025 , 72 . |
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Currently, the research on wind-induced response of membrane structures focuses on the normal wind field, and there is little research on typhoon with greater disaster. In this paper, the wind-induced response of saddle membrane structures under typhoon is studied by numerical simulation. Firstly, the wind field information of typhoon is simulated according to the Weather Research and Forecasting model, and the information is used as the inlet boundary condition of Computational Fluid Dynamics. The vibration modal analysis is carried out, considering the influence of wind field intensity, wind direction angle, rise-span ratio, and pretension on the displacement of the membrane. The results show that the probability density curve of wind-induced response has a certain skewness. The saddle membrane structure has the largest vibration amplitude of the membrane at 0° wind direction angle, and the most unfavorable wind pressure value of the membrane is negative. In reducing the displacement of the membrane, the effect of reducing the wind-induced vibration response by increasing the rise-span ratio of the structure is better than that of the pretension. This paper reveals that the law of wind-induced response can provide a theoretical basis for the design of membrane structures against typhoons. © 2024 Elsevier Ltd
Keyword ：
Numerical simulation Numerical simulation Saddle membrane structure Saddle membrane structure Typhoon wind field Typhoon wind field Wind-induced response Wind-induced response
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| GB/T 7714 | Chen, Z. , Liu, C. , Huang, W. et al. Wind-induced response of saddle membrane structure under typhoon wind field by weather research and forecasting model and computational fluid dynamics [J]. | Thin-Walled Structures , 2024 , 205 . |
| MLA | Chen, Z. et al. "Wind-induced response of saddle membrane structure under typhoon wind field by weather research and forecasting model and computational fluid dynamics" . | Thin-Walled Structures 205 (2024) . |
| APA | Chen, Z. , Liu, C. , Huang, W. , Bao, W. , Li, D. , Liu, J. et al. Wind-induced response of saddle membrane structure under typhoon wind field by weather research and forecasting model and computational fluid dynamics . | Thin-Walled Structures , 2024 , 205 . |
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Wind loads in most random vibration studies are assumed to follow Gaussian processes, and reliability-based design is generally conducted based on moment methods to ensure structural survivability. However, membrane roofs under typhoon attacks are loaded by strong non-Gaussian random excitations. The contributions of the third-order moment (skewness) and fourth-order moment (kurtosis) to the structural reliability become more significant. This study investigated the stochastic dynamic response and reliability of hyperbolic parabolic membrane structures excited by non-Gaussian wind loads. Firstly, the Fokker-Planck-Kolmogorov (FPK) governing equation of membrane structures is established, with considerations of both geometric nonlinear stiffness and nonlinear motion-induced aerodynamic force. Then, the steady-state displacement response is analyzed in the slow-varying process of the system. Consequently, a series of analytical solutions, including probability density function (PDF), root mean square (RMS) value, skewness, and kurtosis, can be obtained. The accuracy of the proposed theoretical model is validated throughout a number of wind tunnel tests including various wind velocities and directions. The effects of geometric nonlinear stiffness term, nonlinear motion-induced aerodynamic force, reduced wind velocity and rise-span ratio on structural reliability are thoroughly discussed. The findings reveal that the structural extreme response shows strong non-Gaussian behavior, featured with skewness of -1.5 ∼ 1.2 and kurtosis of 3.82 ∼ 6.89. The influence of geometric nonlinear stiffness and nonlinear motion-induced aerodynamic force on structural reliability can reach up to 28.42 % and 29.84 %, respectively. Among various design parameters, the reduced wind velocity shows the most significant influence on structural reliability. In the probability-based design framework, the critical reduced wind velocity is identified as 1.2, and the critical rise-span ratio is recommended as 1/10. The research proposed in this paper provides an accurate analytical model for predicting the dynamic behavior of such flexible structures under typhoons. © 2024 Elsevier Ltd
Keyword ：
Geometric nonlinear stiffness Geometric nonlinear stiffness Membranes structures Membranes structures Nonlinear motion-induced aerodynamic force Nonlinear motion-induced aerodynamic force Structural reliability Structural reliability Typhoons Typhoons
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| GB/T 7714 | Li, D. , Zhu, Q. , Shen, R. et al. Random vibration response and reliability analysis of hyperbolic parabolic membrane structures under typhoons [J]. | Thin-Walled Structures , 2024 , 205 . |
| MLA | Li, D. et al. "Random vibration response and reliability analysis of hyperbolic parabolic membrane structures under typhoons" . | Thin-Walled Structures 205 (2024) . |
| APA | Li, D. , Zhu, Q. , Shen, R. , Lu, L. , Lai, Z. . Random vibration response and reliability analysis of hyperbolic parabolic membrane structures under typhoons . | Thin-Walled Structures , 2024 , 205 . |
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The efficient injection of fuel in the combustion chamber is significant for the advancement of the current supersonic vehicles. This study has focused on the role of non-alignment injector configuration on the fuel mixing of the hydrogen jet inside the combustion chamber of the scramjet engine. The fuel distribution and vortex generation behind both annular and coaxial jets are modeled and compared to disclose the mechanism of fuel diffusion in the combustion chamber. A three-dimensional model of two nozzle angles is produced to visualize the complicated flow interaction of four non-aligned circular jets at supersonic cross-flow. Our results indicate that the strength of the vortex pair produced by the core of the fuel jet is extended more when the angle of the nozzles is increased. The flow visualization of the jet also confirms that the flow becomes more complex in non-alignment jet configurations and fuel mixing is improved by the addition of the internal air jet in the suggested injection model. © 2024 Elsevier Ltd
Keyword ：
Combustion chambers Combustion chambers Hydrogen Hydrogen Hydrogen fuels Hydrogen fuels Mixing Mixing Nozzles Nozzles Ramjet engines Ramjet engines Supersonic aerodynamics Supersonic aerodynamics Supersonic aircraft Supersonic aircraft Vortex flow Vortex flow
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| GB/T 7714 | Wang, Haicui , Ma, Zhimin , Bian, Jing et al. Computational study of transverse oblique injectors for improvement of fuel mixing in scramjet engine of supersonic vehicles [J]. | Energy , 2024 , 306 . |
| MLA | Wang, Haicui et al. "Computational study of transverse oblique injectors for improvement of fuel mixing in scramjet engine of supersonic vehicles" . | Energy 306 (2024) . |
| APA | Wang, Haicui , Ma, Zhimin , Bian, Jing , Cao, Liang , Tan, Ji-Ke , Li, Dong . Computational study of transverse oblique injectors for improvement of fuel mixing in scramjet engine of supersonic vehicles . | Energy , 2024 , 306 . |
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Extreme winds, such as typhoons, can lead to serious vibration and damage for flexible membrane roofs. An understanding of the aeroelastic behavior experienced by membrane structures during typhoons is therefore significant to allow well designed in practice. This paper investigates the aeroelastic response of umbrella shaped membrane structures under typhoon experimentally and numerically. The flexible scaled model is tested in typhoon field simulated in wind tunnel to investigate the aeroelastic characteristics varying with wind velocities and wind directions, including displacement response, non-Gaussian characteristics, frequency, modal shape and damping ratios et al. The full coupled fluid-structure interaction numerical model proposed is benchmarked and expanded in parameter discussions. The results indicate that non-Gaussian characteristics appear significant with positive skewness in pressure region and negative skewness in suction region. The probabilistic distribution proves leptokurtic type with kurtosis beyond three. The displacement response in statistics increases almost linearly with wind velocity while the non-Gaussian characteristics remain robust. The high-order mode shapes can be excited in typhoon, and their frequencies and damping ratios vary with wind velocities. The effects of both wind velocity and membrane pretension are proved to be more remarkable than rise-span ratio. This study can address the deficiency of current studies and provisions on the dynamic response of membrane structures in typhoons. © 2024 Elsevier Ltd
Keyword ：
Aerodynamics Aerodynamics Flexible structures Flexible structures Gaussian distribution Gaussian distribution Membrane structures Membrane structures Wind stress Wind stress
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| GB/T 7714 | Li, Dong , Lu, Leiyu , Huang, Hongwei et al. Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation [J]. | Journal of Building Engineering , 2024 , 98 . |
| MLA | Li, Dong et al. "Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation" . | Journal of Building Engineering 98 (2024) . |
| APA | Li, Dong , Lu, Leiyu , Huang, Hongwei , Qiu, Yi , Deng, Xiaowei , Liu, Changjiang . Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation . | Journal of Building Engineering , 2024 , 98 . |
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An increasing number of civil structures are being built near or across earthquake faults, making them more susceptible to severe seismic damage due to the presence of large velocity pulses in near-fault ground motions (NFGMs). Because of limited availability of NFGMs records, synthesized NFGMs are necessary for seismic designing of structures located around near-fault areas. Based on the far-field synthesis of ground motions (GMs), various methods for synthesizing NFGMs by superimposing high-frequency and low-frequency components in the time domain have been developed. However, such techniques suffer from wider variation in the response spectrum between the synthesized NFGMs and the target spectrum. To address this issue, a new approach for synthesizing NFGMs has been proposed. This approach investigates key parameters of the response spectrum for NFGMs based on a comprehensive database. Similarly, the shortcomings in existing NFGM methods have been analyzed by evaluating a couple of criteria for the suitability of the synthesizing method. Two adjustment strategies have been developed to attain consistency in the response spectrum. The spectral characteristics can be maintained during the spectrum adjustment process to overcome limitations of existing methods. Synthesized specimen of NFGMs has been utilized to validate the effectiveness of the proposed approach. © 2024 Elsevier Ltd
Keyword ：
High-frequency components High-frequency components Improved methods Improved methods Near-fault ground motions (NFGMs) Near-fault ground motions (NFGMs) Pulse-like Pulse-like Response spectrum (RS) Response spectrum (RS)
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| GB/T 7714 | Zhang, C. , Wu, C. , Wang, P. et al. Improved methods for synthesizing near-fault ground motions based on specific response spectrum [J]. | Soil Dynamics and Earthquake Engineering , 2024 , 183 . |
| MLA | Zhang, C. et al. "Improved methods for synthesizing near-fault ground motions based on specific response spectrum" . | Soil Dynamics and Earthquake Engineering 183 (2024) . |
| APA | Zhang, C. , Wu, C. , Wang, P. , Li, D. , Lu, J. . Improved methods for synthesizing near-fault ground motions based on specific response spectrum . | Soil Dynamics and Earthquake Engineering , 2024 , 183 . |
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This paper presents the wind tunnel test and numerical simulation on umbrella-shaped tensioned membrane structures to investigate the effects of both high wind velocity and various wind direction of typhoon on their aerodynamic behavior. Finite element models are also developed and benchmarked to further investigate the effects on rise-to-span ratio, wind attack angle, and pretension. Results from the experimental tests and finite element analyses show that: (i) the turbulence buffeting in the leeward surface is significant with large displacement responses, especially with the 0 degrees wind direction, large wind attack angle and high rise-to-span ratio; (ii) Non-Gaussian characteristics become remarkable with increasing skewness and kurtosis, which may be contributed by the high-level turbulence intensity in typhoons; and (iii) the effects of rise-to-span ratio, wind attack angle and pretension are proved more significant, which should be considered in the wind-resistance design of membrane structures in typhoons.
Keyword ：
aerodynamic behavior aerodynamic behavior coupled FSI simulation coupled FSI simulation typhoons typhoons umbrella-shaped membrane structures umbrella-shaped membrane structures wind tunnel test wind tunnel test
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| GB/T 7714 | Li, Dong , Zhang, Zhou , Qiu, Yi et al. Aeroelastic wind tunnel tests and numerical simulations on umbrella-shaped tensioned membrane structures in typhoons [J]. | WIND AND STRUCTURES , 2024 , 39 (5) : 313-327 . |
| MLA | Li, Dong et al. "Aeroelastic wind tunnel tests and numerical simulations on umbrella-shaped tensioned membrane structures in typhoons" . | WIND AND STRUCTURES 39 . 5 (2024) : 313-327 . |
| APA | Li, Dong , Zhang, Zhou , Qiu, Yi , Chen, Zhiwei , Lai, Zhichao . Aeroelastic wind tunnel tests and numerical simulations on umbrella-shaped tensioned membrane structures in typhoons . | WIND AND STRUCTURES , 2024 , 39 (5) , 313-327 . |
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Abstract ：
Extreme winds, such as typhoons, can lead to serious vibration and damage for flexible membrane roofs. An understanding of the aeroelastic behavior experienced by membrane structures during typhoons is therefore significant to allow well designed in practice. This paper investigates the aeroelastic response of umbrella shaped membrane structures under typhoon experimentally and numerically. The flexible scaled model is tested in typhoon field simulated in wind tunnel to investigate the aeroelastic characteristics varying with wind velocities and wind directions, including displacement response, non-Gaussian characteristics, frequency, modal shape and damping ratios et al. The full coupled fluid-structure interaction numerical model proposed is benchmarked and expanded in parameter discussions. The results indicate that non-Gaussian characteristics appear significant with positive skewness in pressure region and negative skewness in suction region. The probabilistic distribution proves leptokurtic type with kurtosis beyond three. The displacement response in statistics increases almost linearly with wind velocity while the non-Gaussian characteristics remain robust. The high-order mode shapes can be excited in typhoon, and their frequencies and damping ratios vary with wind velocities. The effects of both wind velocity and membrane pretension are proved to be more remarkable than rise-span ratio. This study can address the deficiency of current studies and provisions on the dynamic response of membrane structures in typhoons.
Keyword ：
Aerodynamic characteristics Aerodynamic characteristics Flexible model Flexible model Typhoon Typhoon Umbrella membrane structure Umbrella membrane structure X -flow X -flow
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| GB/T 7714 | Li, Dong , Lu, Leiyu , Huang, Hongwei et al. Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
| MLA | Li, Dong et al. "Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation" . | JOURNAL OF BUILDING ENGINEERING 98 (2024) . |
| APA | Li, Dong , Lu, Leiyu , Huang, Hongwei , Qiu, Yi , Deng, Xiaowei , Liu, Changjiang . Investigation on typhoon-induced aero-elastic response of membrane structures by wind tunnel test and numerical simulation . | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
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Elastically mounted flexible membrane roofs exposed to flows are prone to vortex-induced vibrations and even aero-instability due to the strong fluid-structure interaction (FSI). This study is to investigate the FSI mechanism in the saddle-shaped membrane structure over a range of Reynolds numbers and wind directions in laminar flows, by bridging structural vibration responses and flow dynamics. The aeroelastic characteristics of membrane structures, including statistics of displacement responses, oscillation frequency, and oscillation damping ratios, were identified from the perspective of time and frequency domains. Simultaneously, the particle image velocimetry system was employed to visualize the flow features, including velocity vector, turbulence intensity, and vortex evolution in both space and time. The flow modes were further decomposed by proper orthogonal decomposition (POD) to capture the salient aspects of the flow. Three patterns of POD modes are identified, and the first mode plays the dominant role in POD modes. It showed that as the wind Reynolds number increases, the space between the shear layer and membrane surface would be narrowed, and resultantly the vortices turn out smaller in scale and closer in space. This trend leads to an increase in the frequency of vortex shedding and a stronger FSI effect. When the frequency of vortex shedding approaches the fundamental frequency of structures, the vibration of the membrane would be shifted from turbulent buffeting to vortex-induced resonance, featured with lock-in frequency, significant amplified displacement, and negative aerodynamic damping ratio.
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| GB/T 7714 | Li, Dong , Shen, Renyang , Zhu, Qiyin et al. Flow field characteristics and vibration responses of saddle-shaped membrane structures [J]. | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
| MLA | Li, Dong et al. "Flow field characteristics and vibration responses of saddle-shaped membrane structures" . | PHYSICS OF FLUIDS 36 . 10 (2024) . |
| APA | Li, Dong , Shen, Renyang , Zhu, Qiyin , Lu, Leiyu , Ding, Hao , Yang, Xiaoqiang . Flow field characteristics and vibration responses of saddle-shaped membrane structures . | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
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