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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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As the novel wind turbine tower structure, the concrete-filled double-skin tubular (CFDST) wind turbine system shows an excellent mechanical performance compared with conventional steel tubes. This paper performs a comprehensive investigation to better understand structural dynamics and aeroelasticity of CFDST wind turbine system against typhoons. A series of aeroelastic wind tunnel model tests are initially conducted, featuring the tower-blade-nacelle coupled system in simulated typhoon fields. Then, a two-way coupled numerical model is developed, by applying the k-omega SST model to simulate the turbulent flows and aerodynamic loads of the CFDST wind turbine system. The effects of blade rotation, turbulence, and wind speed on the aerodynamic characteristics of the CFDST wind turbine system are discussed based numerical simulations. The results indicate that the dynamic response of the CFDST wind turbine system is dominated by the harmonic excitation from blade rotation (i.e., 1 P and 3 P), especially in the crosswind direction (i.e., 90 degrees and 270 degrees). The structural dynamic response would be significantly amplified with the increasing reduced wind speed and turbulence intensity. Consequently, the maximum mean and fluctuating wind pressure coefficients rise up to 4.23 and 3.2, respectively, at Iuu= 24 % and Ur= 10.7. Correspondingly, the RMS values of lift and drag coefficients reach maximum values of 0.38 and 1.15, respectively. This study gains insight into the aerodynamic behavior of the integrated wind turbine system with CFDST tower.
Keyword ：
Aerodynamic characteristics Aerodynamic characteristics Computational fluid dynamics (CFD) Computational fluid dynamics (CFD) Concrete-filled double-skin tubular (CFDST) Concrete-filled double-skin tubular (CFDST) Dynamic response Dynamic response Wind tunnel test Wind tunnel test
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| GB/T 7714 | Li, Dong , Fang, Shijing , Sun, Chuang et al. Aeroelastic wind tunnel study and numerical simulation of Concrete-Filled Double-Skin Tubular (CFDST) wind turbine system [J]. | STRUCTURES , 2025 , 74 . |
| MLA | Li, Dong et al. "Aeroelastic wind tunnel study and numerical simulation of Concrete-Filled Double-Skin Tubular (CFDST) wind turbine system" . | STRUCTURES 74 (2025) . |
| APA | Li, Dong , Fang, Shijing , Sun, Chuang , Xu, Fujie , Zhao, Jie , Lai, Zhichao . Aeroelastic wind tunnel study and numerical simulation of Concrete-Filled Double-Skin Tubular (CFDST) wind turbine system . | STRUCTURES , 2025 , 74 . |
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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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The fluid-structure interaction (FSI) effects existing in air-supported membrane roofs subjected to wind loading are significant, which would result in the vortex-induced resonance. This study employs the particle image velocimetry (PIV) technique to systematically explore the FSI mechanism of open-typed hexagonal inflatable membrane structures, with different Reynolds numbers and angles of attack considered. The PIV system is utilized to visualize and capture the surrounding flow field characteristics, including vortex separation, turbulence intensity, and eddy structures. Simultaneously, the aeroelastic responses of the membrane structure are comprehensively analyzed in both time and frequency domains, such as the displacement statistic, vibration frequency, damping ratio, and vibration mode. By integrating the fluid spatiotemporal evolution and structural dynamics, it is indicated that the angle of attack plays a pivotal role in FSI effects. It is indicated that as the angle of attack increases, the position of vortex separation shifts from the trailing edge to the leading edge of the membrane surface. This trend would enhance the FSI effect and trigger the vortex-induced vibration (VIV). In the case of large angle of attack (20 degrees) and Reynolds number (4.55 x105), the vortex structure develops more sufficiently, with its diameter enlarged and quantity increased significantly. The VIV phenomenon can be observed on the leeward side of the membrane when the reduced wind speed is close to 1.95, characterized by an obvious amplitude jump, a sharp reduction of damping ratios, and frequency lock-in.
Keyword ：
Dynamics Dynamics FSI FSI Membrane structures Membrane structures PIV PIV Vibration Vibration
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| GB/T 7714 | Li, Dong , Wang, Ziming , Lin, Mingxuan et al. Flow field characteristics and vibration response of ortho-hexagonal air-supported membrane structures [J]. | STRUCTURES , 2025 , 76 . |
| MLA | Li, Dong et al. "Flow field characteristics and vibration response of ortho-hexagonal air-supported membrane structures" . | STRUCTURES 76 (2025) . |
| APA | Li, Dong , Wang, Ziming , Lin, Mingxuan , Huang, Hongwei , Xu, Hongguang , Zhao, Jie et al. Flow field characteristics and vibration response of ortho-hexagonal air-supported membrane structures . | STRUCTURES , 2025 , 76 . |
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Stainless-clad (SC) bimetallic steel is an advanced laminated material that offers an economical solution for structures in corrosive environments. However, its mechanical performance and design methods are not yet established, limiting the application of these high-performance materials. This paper experimentally investigated the axial compressive behavior and performance deterioration of SC bimetallic square steel tubes in a chloride ion environment. A total of 33 SC bimetallic steel coupons and square tube members were employed for salt spray accelerated corrosion tests. After corrosion, the surface morphology of the corroded square steel tube was obtained by the three-dimensional (3D) scanning method to identify the corrosion depth and then establish the correlation between corrosion depth and material properties. The monotonic axial compression tests of the corroded square steel tube were thereafter carried out, and the deterioration pattern was analyzed, in terms of the failure mode, local buckling behavior, strength capacity, and ductility. The feasibility of current national codes to estimate the mechanical properties was evaluated and improved. The results demonstrated that the corrosion resistance of SC bimetallic square steel tubes was much better than that of carbon square steel tubes in chloride ion environments, showing noticeably smoother surface morphology and lower deterioration in the ultimate capacity (half of low-carbon steel) and ductility (1/5 of low-carbon steel). The proposed formula can reasonably predict the mechanical properties of corroded SC bimetallic steel tubes, and fill the gap in current national codes.
Keyword ：
Axial compression Axial compression Bimetallic steel Bimetallic steel Design method Design method Salt spray corrosion Salt spray corrosion Square tube Square tube
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| GB/T 7714 | Li, Dong , Lin, Mingxuan , Wang, Ziming et al. Axial compressive behavior and deterioration pattern of stainless-clad bimetallic square steel tubes under chloride ion environment [J]. | ENGINEERING STRUCTURES , 2025 , 332 . |
| MLA | Li, Dong et al. "Axial compressive behavior and deterioration pattern of stainless-clad bimetallic square steel tubes under chloride ion environment" . | ENGINEERING STRUCTURES 332 (2025) . |
| APA | Li, Dong , Lin, Mingxuan , Wang, Ziming , Sang, Yuan , Zhao, He , Yang, Xiaoqiang . Axial compressive behavior and deterioration pattern of stainless-clad bimetallic square steel tubes under chloride ion environment . | ENGINEERING STRUCTURES , 2025 , 332 . |
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With larger rotors and taller towers developed to capture more wind energy, the wind turbine structures are becoming more flexible with aspect ratio increasing. However, there remains a strong gap of dynamic analysis of fully coupled high-aspect-ratio wind turbine tower system. This study employed the IEA 15 WM wind turbine as a reference prototype, and designed a scaled model based on the geometric, kinematic, and dynamic similarity principles. Then, the systematic investigations of dynamic behavior of coupled wind turbine tower system were performed tested combined wind tunnel tests with computational fluid dynamics (CFD) modelling. The dynamic behavior was analyzed in terms of acceleration and displacement responses, motion trajectories, and dynamic characteristics in both crosswind and downwind directions. In CFD modelling, the aerodynamic characteristics were revealed in terms of the average pressure coefficient, fluctuating pressure coefficient, and lift and drag forces. Parameter discussions were performed including the blade rotation, turbulence intensity and wind speed. The results indicate that turbine vibrations are highly sensitive to variations in wind speed and turbulence. As wind speed and turbulence increase, the range of vibration data expands, with peak responses amplified by 249.70 % and 59.63 %, respectively, and lift forces increasing by over 40 %. Furthermore, blade rotation increases the average pressure coefficient by up to 42.09 %. Compared to the previous studies of low-aspect-ratio wind turbine tower case, high-aspect-ratio wind turbine tower exhibit significantly more intense vibrations in the same operating cases, with an increase in the root mean square (RMS) of acceleration up to 52.50 %. Additionally, the slender tower structures are more susceptible to higher-order frequency excitations induced by fluid solid interactions during operation.
Keyword ：
Aerodynamic behavior Aerodynamic behavior Computational fluid dynamics (CFD) Computational fluid dynamics (CFD) High aspect ratio High aspect ratio Wind tunnel tests Wind tunnel tests Wind turbine towers Wind turbine towers
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| GB/T 7714 | Li, Dong , Sang, Yuan , Lv, Zhihao et al. Dynamic response analysis of wind turbine tower with high aspect ratio: Wind tunnel tests and CFD simulation [J]. | THIN-WALLED STRUCTURES , 2025 , 211 . |
| MLA | Li, Dong et al. "Dynamic response analysis of wind turbine tower with high aspect ratio: Wind tunnel tests and CFD simulation" . | THIN-WALLED STRUCTURES 211 (2025) . |
| APA | Li, Dong , Sang, Yuan , Lv, Zhihao , Wu, Keda , Lai, Zhichao . Dynamic response analysis of wind turbine tower with high aspect ratio: Wind tunnel tests and CFD simulation . | THIN-WALLED STRUCTURES , 2025 , 211 . |
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The dynamic behavior of flexible membrane roofs in surrounding fluid flows involves complex fluid-structure interactions (FSIs), which would lead to vortex resonance and even aeroelastic instability. In this paper, the FSI effects of saddle-shaped membrane roofs in laminar flows over a range of wind velocities and wind directions are investigated, by simultaneously applying a high-resolution particle image velocimetry (PIV) system and laser displacement sensor in wind tunnels. The flow field is visualized by the PIV system and analyzed in the view of the spatiotemporal evolution of flow velocity and vorticity, as well as the proper orthogonal decomposition analysis. Then, the structural dynamic response is investigated in terms of displacement statistics and dynamic characteristics, and finally the FSI mechanisms are revealed. The results show that both wind velocity and wind direction have a significant effect on the leading-edge separation, especially in the case of larger wind velocity and 45 degrees wind direction. The increasing wind velocity would result in the unstable leading-edge separated shear layer, reduced vortex diameter, and increased vortex shedding frequency. Consequently, the leading-edge separation intensifies the vibration of the membrane roof, which could increase the vibration frequency, the average and maximum displacement by a factor of 3 to 4, and the standard deviation value by a factor of 3 to 5. The vortex-induced resonance appears at the wind velocity of 20 m/s and wind direction of 0 degrees, featuring the sharp increase in displacement, negative aerodynamic damping, and frequency lock-in.
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| GB/T 7714 | Li, Dong , Qiu, Yi , Shen, Renyang et al. Experimental study of fluid-structure interaction of flexible saddle-shaped tensioned membrane roofs in laminar flows [J]. | PHYSICS OF FLUIDS , 2025 , 37 (8) . |
| MLA | Li, Dong et al. "Experimental study of fluid-structure interaction of flexible saddle-shaped tensioned membrane roofs in laminar flows" . | PHYSICS OF FLUIDS 37 . 8 (2025) . |
| APA | Li, Dong , Qiu, Yi , Shen, Renyang , Wang, Ziming , Liao, Yizhen . Experimental study of fluid-structure interaction of flexible saddle-shaped tensioned membrane roofs in laminar flows . | PHYSICS OF FLUIDS , 2025 , 37 (8) . |
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To advance the application of sustainable recycled aggregate concrete (RAC) in bridge engineering, this study introduces a novel reinforced RAC-filled circular steel tubular (RRACFCST) column, leveraging the dual confinement of an external steel tube and an internal reinforcement cage. Its primary novelty is a comprehensive analytical framework integrating a new theoretical model by using limit analysis, ferrule theory, and the twin shear unified strength theory. Then, a rigorously validated nonlinear finite element model that incorporated material nonlinearity and interface effects was used to validate the proposed theoretical model. The results demonstrate the significant performance of the steel reinforcement cage, which enhanced the axial bearing capacity by 17.86%, and an optimal recycled aggregate replacement rate of 70% yielded the bearing capacity, with 100% replacement still achieving a 13.3% higher capacity than unconfined conventional concrete, demonstrating how effective confinement can compensate for and overcome the inherent deficiencies of RCA. Conversely, larger diameter-thickness ratios would reduce the strength by 33.7%. These quantifiable findings provide critical design insights and a validated predictive tool, establishing the RRACFCST column as a promising and high-performance sustainable solution for bridge structures.
Keyword ：
axial compressive bearing capacity axial compressive bearing capacity concrete-filled circular steel tube concrete-filled circular steel tube constrained effect coefficient constrained effect coefficient limit analysis method limit analysis method recycled aggregate concrete recycled aggregate concrete recycled coarse aggregate replacement rate recycled coarse aggregate replacement rate
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| GB/T 7714 | Li, Dong , Wu, Fanxi , Liu, Changjiang et al. Theoretical and Numerical Simulation Analysis of the Axial Compressive Performance of Recycled Aggregate Concrete-Filled Steel Tubular Columns for Bridges [J]. | BUILDINGS , 2025 , 15 (18) . |
| MLA | Li, Dong et al. "Theoretical and Numerical Simulation Analysis of the Axial Compressive Performance of Recycled Aggregate Concrete-Filled Steel Tubular Columns for Bridges" . | BUILDINGS 15 . 18 (2025) . |
| APA | Li, Dong , Wu, Fanxi , Liu, Changjiang , Ye, Weihua , Chen, Yiqian . Theoretical and Numerical Simulation Analysis of the Axial Compressive Performance of Recycled Aggregate Concrete-Filled Steel Tubular Columns for Bridges . | BUILDINGS , 2025 , 15 (18) . |
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Extreme loads, such as impacts and explosions, can cause significant damage to structural components. It is crucial to thoroughly examine the residual bearing capacity of structures subjected to these extreme loads, which will enable engineers to make informed recommendations regarding repairs or reinforcements, thereby preventing further damage and extending the lifespan of these structures. This study presented an experimental and numerical investigation into the residual behavior of ultra-high-performance concrete-filled high-strength square steel tube (UHPC-FHST) members after lateral impact. A total of 15 tests were conducted, including lateral impact tests using a drop hammer testing machine and subsequent axial compression tests using a hydraulic testing machine. Of these, 12 specimens were subjected to impact loading followed by residual capacity assessment, while three intact specimens served as control groups during the axial compression tests. The failure modes, residual bearing capacity, and load-displacement curves of the specimens were obtained. Based on the experimental results, parametric analyses were performed to examine the effects of the yield strength of the steel tube, tube thickness, impact location, and impact energy on the residual mechanical performance of specimens (i. e., residual lateral deformation, residual axial bearing capacity, and residual ratio). The results showed that UHPC-FHST specimens exhibited excellent resistance to lateral impact, retaining a large level of residual bearing capacity after impact; increasing the yield strength and thickness of the steel tube effectively reduces residual deformation, and significantly enhances its residual capacity and energy absorption capacity; overall flexural failure and following second-order effects weakened the residual capacity of mid-span impact specimens, and shear failure and crack propagation of concrete were the main causes of damage for end impact conditions. Finally, a finite element (FE) model was also developed and validated using the experimental data. The established FE model demonstrated good agreement with the test results, offering a solid theoretical basis for further research on the residual performance of UHPC-FHST members subjected to lateral impact.
Keyword ：
Concrete-filled steel tube Concrete-filled steel tube Finite element analysis Finite element analysis High-strength steel High-strength steel Lateral impact Lateral impact Residual behavior Residual behavior UHPC UHPC
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| GB/T 7714 | Yang, Xiaoqiang , Huang, Jie , Zhang, Zhiqi et al. Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact [J]. | ENGINEERING STRUCTURES , 2025 , 341 . |
| MLA | Yang, Xiaoqiang et al. "Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact" . | ENGINEERING STRUCTURES 341 (2025) . |
| APA | Yang, Xiaoqiang , Huang, Jie , Zhang, Zhiqi , Fang, Xiaojun , Li, Dong , Bi, Kaiming . Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact . | ENGINEERING STRUCTURES , 2025 , 341 . |
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For medium and small-scale steel structure stadiums, in order to minimize the impact of the construction process on the structural state, a prestressing construction process tailored to medium and small stadiums is proposed, taking full advantage of the inherent elastic deformation range of steel structures. The main steps of the process involve the construction of the main truss first. After the main truss construction is completed, it is lowered to a certain position within its elastic range using cables. The roof grid is then connected to the main truss. Once all connections are completed, the cable tension is gradually released. After the cable tension is released, the main truss exhibits a certain degree of rebound. During the rebound process, the roof grid forms a prestressed structure, ensuring stability and integrity between the main truss and the roof. Through numerical simulation, process analysis is conducted on this construction process, and the optimal construction scheme is proposed.
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| GB/T 7714 | Yao, Wang , Hao, Zhang , Feng, Zhang et al. Construction Method and Process Optimization of Prestress Reverse Tensioning for Large-Span Bidirectional Suspension Steel Roof Structures [J]. | ADVANCES IN CIVIL ENGINEERING , 2024 , 2024 . |
| MLA | Yao, Wang et al. "Construction Method and Process Optimization of Prestress Reverse Tensioning for Large-Span Bidirectional Suspension Steel Roof Structures" . | ADVANCES IN CIVIL ENGINEERING 2024 (2024) . |
| APA | Yao, Wang , Hao, Zhang , Feng, Zhang , Yang, Li , Dong, Li , Min, Bao . Construction Method and Process Optimization of Prestress Reverse Tensioning for Large-Span Bidirectional Suspension Steel Roof Structures . | ADVANCES IN CIVIL ENGINEERING , 2024 , 2024 . |
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