Journal of Wind Engineering and Industrial Aerodynamics最新文献_第4页

Research on probabilistic characteristics and wind pressure extreme values of adjustable-tilt solar photovoltaic systems panels under full-direction wind 全风向下可调倾角太阳能光伏系统面板的概率特性和风压极值研究

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-12 DOI: 10.1016/j.jweia.2024.105913

Terigen Bao , Zhengnong Li , Ou Pu , Bin Huang

This study presents a novel investigation into the impact of non-Gaussian characteristics on wind pressure peak factors and extreme values in photovoltaic structural panels, addressing a critical gap in current design methodologies. A wind tunnel test was conducted on a rigid model of an adjustable-tilt solar photovoltaic system, providing essential panel wind pressure data. Through a comprehensive analysis of wind pressure time history, probability density, skewness, kurtosis, and statistical distributions, this research identified distinct non-Gaussian characteristics and highlighted sensitive areas on the panel. The study utilized three extreme value estimation methods to calculate peak wind pressures and compared their accuracy. Results demonstrate that the GPD method offers the most precise calculations of extreme wind pressure, outperforming traditional Gaussian-based approaches, which often underestimate peak pressures by 30%–50%. Additionally, the comparison of full-direction wind data with single wind direction extremes reveals potential overestimations in design values, suggesting that using one-directional extremes could inflate extreme wind pressure by 1.1–1.25 times for positive and 1.1 to 1.15 times for negative values. This study underscores the necessity of incorporating non-Gaussian features and full-direction wind considerations in the structural design of photovoltaic systems to avoid underestimation or over-design, particularly in sensitive regions. These findings contribute valuable insights for enhancing the precision and safety of structural design in renewable energy applications.

本研究针对非高斯特性对光伏结构板风压峰值系数和极值的影响进行了一项新颖的调查，解决了当前设计方法中的一个关键缺陷。对可调倾角太阳能光伏系统的刚性模型进行了风洞试验，提供了重要的面板风压数据。通过对风压时间历史、概率密度、偏度、峰度和统计分布的综合分析，这项研究确定了明显的非高斯特征，并突出了面板上的敏感区域。研究采用了三种极值估计方法来计算峰值风压，并比较了它们的准确性。结果表明，GPD 方法提供了最精确的极值风压计算，优于传统的基于高斯的方法，后者通常会将峰值风压低估 30%-50%。此外，将全风向数据与单风向极值进行比较后发现，设计值可能会被高估，这表明使用单风向极值可能会将极端风压的正值夸大 1.1-1.25 倍，负值夸大 1.1-1.15 倍。这项研究强调了在光伏系统结构设计中纳入非高斯特征和全风向考虑的必要性，以避免低估或过度设计，尤其是在敏感地区。这些发现为提高可再生能源应用中结构设计的精确性和安全性提供了宝贵的见解。

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引用次数: 0

Effects of Reynolds number and surface modification on wake-induced vibrations of two staggered circular cylinders 雷诺数和表面改性对两个交错圆筒的唤醒振动的影响

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-09 DOI: 10.1016/j.jweia.2024.105912

Thu Dao, Hisato Matsumiya, Kyohei Noguchi, Gabriel Mohallem, Runze Xu, Tomomi Yagi

This study explores the role of Reynolds numbers (Re) in wake-induced vibrations (WIVs) of two cylinders, specifically wake galloping and two-degree-of-freedom coupled flutter on the downstream cylinder. The center-to-center distances between the cylinders were 3.0D −5.0D in along-flow direction and 0.0D −2.0D in cross-flow direction (D is the diameter of the cylinders). The Re ranged from 1.4 × 10⁴–6.7 × 10⁴, within the subcritical Re regime of a smooth cylinder. The supercritical Re regime was realized by winding 12 spiral protuberances along the cylinders to lower the critical Re. Descriptions of wake interference of two smooth cylinders at Re = 850–6.5 × 10⁵ were summarized from the literature. Wake interference strongly depended on Re, even within the subcritical Re regime. WIVs mostly occurred in the upper subcritical Re regime with strong wake interference. In the supercritical Re regime, the wakes of the cylinders were narrowed and vortex shedding was suppressed. Consequently, the wake interference and WIVs were weakened or completely disappeared. The cylinders fitted with 12 spiral protuberances reportedly reached the supercritical Re regime at Re = 3.1 × 10⁴. Resultantly, they were stable against WIVs above this Re even at close spacing, and suitable for stay cable applications.

本研究探讨了雷诺数（Re）在两个气缸的尾流诱导振动（WIVs）中的作用，特别是下游气缸上的尾流奔腾和两自由度耦合扑腾。圆筒之间的中心到中心距离在顺流方向为 3.0D -5.0D，在横流方向为 0.0D -2.0D（D 为圆筒直径）。Re 值范围为 1.4 × 104-6.7 × 104，属于光滑圆柱体的亚临界 Re 值范围。通过沿圆柱体缠绕 12 个螺旋突起来降低临界 Re 值，从而实现了超临界 Re 值。从文献中总结了两个光滑圆柱体在 Re = 850-6.5 × 105 条件下的唤醒干扰。即使在亚临界 Re 条件下，唤醒干涉也与 Re 密切相关。WIVs 主要发生在具有强烈唤醒干涉的亚临界 Re 上层。在超临界 Re 状态下，圆柱体的湍流变窄，涡流脱落受到抑制。因此，唤醒干扰和 WIV 被减弱或完全消失。据报道，装有 12 个螺旋突起的圆筒在 Re = 3.1 × 104 时达到了超临界 Re 状态。因此，即使在间距很近的情况下，它们也能稳定地抵御高于此 Re 值的 WIV，适用于留缆应用。

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引用次数: 0

Deep learning-based extension of wind pressure time series 基于深度学习的风压时间序列扩展

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-07 DOI: 10.1016/j.jweia.2024.105909

Biao Tong , Yang Liang , Jie Song , Gang Hu , Ahsan Kareem

The spatio-temporal variation of the wind pressure field is crucial for understanding structural loads and their effect on design. However, obtaining long-duration wind pressure time series around bluff bodies through wind tunnel tests or stochastic and computational simulations is both costly and time-consuming. To address this challenge, this study develops a deep learning (DL) model called WPTSE-Net for extending non-Gaussian wind pressure time series, thereby eliminating the need for the characterization of their nonlinear features and providing an end-to-end flexible framework for extending pressure coefficient time series. The key innovation of WPTSE-Net lies in the reconstruction of the encoder, utilizing prior knowledge to eliminate complex steps in searching for the latent space. This improvement not only enhances computational efficiency and model performance but also substantially reduces the amount of training data that is required for the DL generative model. Comparative results indicate that the proposed WPTSE-Net model outperforms traditional methods in terms of statistical characteristics, i.e., spectra, and peak value distributions. Thus, WPTSE-Net is highly suitable for practical engineering applications as it provides an efficient means of generating long-time series of wind pressure on bluff bodies in wind resistance design.

风压场的时空变化对于了解结构荷载及其对设计的影响至关重要。然而，通过风洞试验或随机模拟和计算模拟获取崖体周围的长时间风压时间序列既昂贵又耗时。为应对这一挑战，本研究开发了一种名为 WPTSE-Net 的深度学习（DL）模型，用于扩展非高斯风压时间序列，从而无需对其非线性特征进行表征，并为扩展压力系数时间序列提供了一个端到端的灵活框架。WPTSE-Net 的关键创新在于编码器的重构，利用先验知识消除了搜索潜空间的复杂步骤。这一改进不仅提高了计算效率和模型性能，还大大减少了 DL 生成模型所需的训练数据量。比较结果表明，所提出的 WPTSE-Net 模型在统计特征（即光谱和峰值分布）方面优于传统方法。因此，WPTSE-Net 非常适合实际工程应用，因为它提供了在抗风设计中生成崖体风压长时间序列的有效方法。

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引用次数: 0

Numerical investigation on the heat dissipation of phase change materials used in the high-speed train brake system 高速列车制动系统中使用的相变材料的散热数值研究

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-05 DOI: 10.1016/j.jweia.2024.105911

Mingyang Liu , Chen Jiang , Jin Yi , Guangjun Gao , Zan Deng , Huifen Zhu

The massive heat dissipation demands of the brake system in high-speed trains pose a significant obstacle to achieving higher operation speeds. Phase change material has attracted considerable attention in various fields due to their exceptional heat dissipation capabilities, yet their utilization in the brake system of high-speed trains remains unexplored. This study aims to investigate the feasibility of phase change material application in the brake system of high-speed train. Specifically, in Case A, the introduction of phase change material resulted in a notable 21% decrease in the average temperature and a remarkable 40% reduction in the maximum temperature difference within the brake system. The latent heat of the phase change material plays a crucial role in maintaining a substantial temperature differential between the cooling components and discs, thereby enhancing heat flux in the brake system. Phase change materials exhibit superior cooling performance compared to traditional air cooling methods in the brake system. To expedite the cooling process of phase change material and facilitate its transition from liquid to solid, an optimized brake system structure utilizing phase change material was proposed. This optimized design holds promise in enhancing the overall heat dissipation efficiency of the high-speed train brake system.

高速列车制动系统的巨大散热需求对实现更高的运行速度构成了重大障碍。相变材料因其优异的散热性能在各个领域都引起了广泛关注，但其在高速列车制动系统中的应用仍有待探索。本研究旨在探讨相变材料在高速列车制动系统中应用的可行性。具体而言，在案例 A 中，相变材料的引入使制动系统内的平均温度显著降低了 21%，最大温差显著降低了 40%。相变材料的潜热在维持冷却组件与制动盘之间的巨大温差方面发挥了关键作用，从而提高了制动系统中的热通量。与制动系统中传统的空气冷却方法相比，相变材料的冷却性能更为出色。为了加快相变材料的冷却过程并促进其从液态到固态的转变，我们提出了一种利用相变材料的优化制动系统结构。这种优化设计有望提高高速列车制动系统的整体散热效率。

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引用次数: 0

Wind tunnel measurements of cross-ventilation flow in a realistic building geometry: Influence of building partitions and wind direction 风洞测量现实建筑几何形状中的交叉通风流：建筑隔墙和风向的影响

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-04 DOI: 10.1016/j.jweia.2024.105907

Mutmainnah Sudirman , Stefanie Gillmeier , Twan van Hooff , Bert Blocken

Wind tunnel measurements have widely been used for validation of computational fluid dynamics simulations of natural ventilation airflows. However, the majority of such measurements employed simple generic single-zone buildings, while there is a lack of studies on realistic buildings including flow-critical geometrical features (e.g. internal partitions). To assess the effect of internal partitions at different incident flow angles (α = 0° and α = 30°), wind tunnel measurements of velocities in and around a cross-ventilated realistic residential building (with and without internal partition) were performed. Measurements were conducted at a geometric scale 1:40, using laser Doppler anemometry. Results indicate a large impact of the internal partition on indoor airflow distribution and resulting ventilation flow rates. For instance, for α = 0°, on the partitioned building side, regions of velocity increase (from ∼0 m/s to ∼80% of the outdoor reference velocity, U_ref), but also regions of velocity decrease (from ∼50% of U_ref to ∼0 m/s) were observed. The ventilation flow rate through the windows at the partitioned side decreased by 23% and 32%, respectively. For the partitioned building, a change from α = 0° to α = 30° resulted in regions of velocity increase from 0 m/s to ∼60% of U_ref.

风洞测量被广泛用于验证自然通风气流的计算流体力学模拟。然而，此类测量大多采用简单的通用单区建筑，而缺乏对包含流动关键几何特征（如内部分区）的现实建筑的研究。为了评估内部隔板在不同入射流角（α = 0° 和 α = 30°）下的影响，我们在风洞中测量了交叉通风的现实住宅楼（有内部隔板和无内部隔板）内部和周围的速度。测量采用激光多普勒风速仪，几何比例为 1:40。结果表明，内部隔墙对室内气流分布和由此产生的通风流量有很大影响。例如，当 α = 0° 时，在隔断建筑一侧观察到速度增加的区域（从室外参考速度 Uref 的 ∼ 0 m/s 到 ∼ 80%），但也观察到速度降低的区域（从 Uref 的 ∼ 50% 到 ∼ 0 m/s）。通过隔断侧窗户的通风流量分别下降了 23% 和 32%。对于分隔建筑，从 α = 0° 到 α = 30° 的变化导致速度从 0 m/s 上升到 Uref 的 60%。

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引用次数: 0

Numerical study on flow field of high-speed train passing through a new type of station 高速列车通过新型车站时的流场数值研究

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-04 DOI: 10.1016/j.jweia.2024.105908

Minzhang Liu , Ni Gao , Zhiyu Song , Bin Yang , Xin Zhu , Jingwen Wu , Kaisen Liang

With the growing demand for efficient travel, tunnels are being lengthened and train speeds are being increased. High-speed subway brings new challenges to the flow environment of tunnel. Additionally, the emergence of express trains passing through stations without stopping has an enormous impact on the tunnel's and the station's flow field. This study focuses on a new type of station (NS) with overtaking and avoidance lines, allowing slow trains to stop for passengers to get on and off, while express trains pass through without stopping. The study analyzes pressure variation and wind speed when express trains pass through the NS without stopping. Different train speeds are taken into account. Based on this, the enhancement of station ventilation by utilizing the piston winds generated by express trains passing through NS is investigated. The air exchange effect and energy savings of the NS are explored. The results indicate that enhancing station air exchanges by fully utilizing piston wind saves about 190.68 kWh/day in mechanical ventilation energy consumption. This study contributes to the improvement of subway station construction and the advancement of subway train development. It can offer data assistance and theoretical direction for high-speed train operations.

随着人们对高效旅行的需求不断增长，隧道在不断延长，列车的速度也在不断提高。高速地铁给隧道的流动环境带来了新的挑战。此外，不停车通过车站的快速列车的出现也对隧道和车站的流场产生了巨大影响。本研究的重点是一种新型车站（NS），该车站设有超车线和避让线，允许慢车停车供乘客上下车，而快车则不停车通过。研究分析了特快列车不停车通过 NS 时的压力变化和风速。研究考虑了不同的列车速度。在此基础上，研究了如何利用特快列车通过 NS 时产生的活塞风加强车站通风。探讨了 NS 的空气交换效果和节能效果。结果表明，充分利用活塞风加强车站空气交换，每天可节省机械通风能耗约 190.68 千瓦时。这项研究有助于改进地铁车站建设，推动地铁列车发展。它可以为高速列车运行提供数据帮助和理论指导。

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引用次数: 0

Nonlinear unsteady aerodynamic forces prediction and aeroelastic analysis of wind-induced bridge response at multiple wind speeds: A deep learning-based reduced-order model 对多种风速下风引起的桥梁响应进行非线性非稳定空气动力预测和气动弹性分析：基于深度学习的降阶模型

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-02 DOI: 10.1016/j.jweia.2024.105905

Li-ming Zhao , Wen-ming Zhang , Zhi-wei Wang , Yao-jun Ge , Nan Jiang

Machine learning-based aerodynamic reduced-order models (ROMs) combine high accuracy with extremely low computational costs, making them highly effective in predicting nonlinear and unsteady bridge aerodynamic forces. Although several machine learning-based nonlinear aerodynamic models have been developed, the majority are built on a single wind speed parameter. However, in nonlinear aerodynamic prediction and aeroelastic analysis of bridges, the variability in incoming wind speed significantly influences the computed results. A ROM relying solely on a single wind speed lacks the ability to accurately forecast the intricate dynamic behaviors arising from changes in wind speed. When the incoming wind speed changes, the model's prediction accuracy significantly decreases. Usually, it is necessary to establish a new database and train a new model, which not only increases time and cost but also greatly reduces the convenience of the ROM. Addressing this challenge, this study proposes a multiple-wind-speed (MWS) nonlinear unsteady bridge aerodynamic model based on the LSTM deep neural network. Taking the Taohuayu Yellow River Bridge in the Henan Province of China as an example, the modeling process of the proposed MWS-ROM is demonstrated, along with non-linear aerodynamic predictions of the deck under various conditions and aerodynamic-elastic analysis of the deck under different wind speeds. The research results show that the trained LSTM network can accurately predict the nonlinear aerodynamic forces of bridges under single and double degrees of freedom vibration conditions. The MWS-ROM performed well in predicting convergent vibrations at low wind speeds and limits cycle oscillations at high wind speeds, aligning closely with results from the CFD full-order model. Compared to CFD, the aerodynamic ROM based on the LSTM network significantly enhances computational efficiency, consequently boosting the convenience and efficiency of bridge flutter analysis. Additionally, the methodology proposed herein can be extended for wind-induced vibration control and response prediction in other types of deck sections.

基于机器学习的空气动力学降阶模型（ROM）兼具高精度和极低的计算成本，因此在预测非线性和非稳态桥梁空气动力方面非常有效。虽然已经开发了多个基于机器学习的非线性空气动力学模型，但大多数模型都是基于单一风速参数建立的。然而，在桥梁的非线性气动力预测和气动弹性分析中，风速的变化会对计算结果产生重大影响。仅依靠单一风速的 ROM 无法准确预测风速变化引起的复杂动态行为。当进入的风速发生变化时，模型的预测精度会明显降低。通常情况下，需要建立新的数据库并训练新的模型，这不仅增加了时间和成本，还大大降低了 ROM 的便利性。针对这一难题，本研究提出了一种基于 LSTM 深度神经网络的多风速（MWS）非线性非稳态桥梁空气动力学模型。以中国河南省桃花峪黄河大桥为例，演示了所提出的 MWS-ROM 的建模过程，以及不同条件下桥面的非线性气动预测和不同风速下桥面的气动弹性分析。研究结果表明，训练有素的 LSTM 网络可以准确预测单自由度和双自由度振动条件下桥梁的非线性空气动力。MWS-ROM 在预测低风速下的收敛振动和高风速下的极限周期振荡方面表现出色，与 CFD 全阶模型的结果非常接近。与 CFD 相比，基于 LSTM 网络的气动 ROM 显著提高了计算效率，从而提高了桥梁飘移分析的便利性和效率。此外，本文提出的方法还可扩展用于其他类型桥面截面的风致振动控制和响应预测。

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引用次数: 0

Impacts of building modifications on the turbulent flow and heat transfer in urban surface boundary layers 建筑物改造对城市地表边界层湍流和传热的影响

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-01 DOI: 10.1016/j.jweia.2024.105906

Seika Tanji , Tetsuya Takemi , Guangdong Duan

This study examines turbulent airflow and upward heat transport in real urban environments using a building-resolving large-eddy simulation model to understand the characteristics of turbulent airflow and upward heat transport when geometrical distributions of buildings are modified. The target areas were two real urban districts within Osaka City, Japan, having different morphological features. In the numerical experiments, the initial condition was set to a neutral condition in which temperature is uniformly distributed vertically, and buildings emitted heat at a constant rate. The results in the two districts indicated that the features of turbulence and heat transport distinctly differed with different building arrangement. Specifically, taller buildings significantly decelerated airflows and induced warming behind buildings. More high-rise buildings (which resulted in a larger building variability) in a district with a larger building density caused a large heat flux and warming at higher levels. The sensitivity experiments in which a density and height variability of buildings were modified showed that a building density at higher levels and a building height variability significantly influenced warming at upper levels. An increased building height variability weakened wind speed and disturbed horizontal heat advection, whereas a large building density caused numerous heat sources.

本研究利用建筑物解析大涡流模拟模型对实际城市环境中的湍流气流和热量向上输送进行了研究，以了解建筑物几何分布发生改变时湍流气流和热量向上输送的特征。目标区域是日本大阪市内两个具有不同形态特征的真实城区。在数值实验中，初始条件设定为温度垂直均匀分布的中性条件，建筑物以恒定速率散发热量。两个地区的实验结果表明，湍流和热量传输的特征随着建筑物排列的不同而明显不同。具体而言，较高的建筑物会明显减慢气流速度，并导致建筑物后方升温。在一个建筑密度较大的地区，更多的高层建筑（这导致了更大的建筑变异性）导致了更高处的大量热通量和升温。修改建筑物密度和高度变化的敏感性实验表明，较高楼层的建筑物密度和建筑物高度变化对较高楼层的升温有显著影响。建筑物高度变化的增加削弱了风速，扰乱了水平热传导，而较大的建筑物密度则会造成大量热源。

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引用次数: 0

Experimental investigations on the influence of bridge deck gratings on the aerodynamic stability of the long-span suspension footbridge with a streamlined double-side box girder 桥面光栅对流线型双侧箱梁大跨度悬索人行天桥气动稳定性影响的实验研究

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-10-01 DOI: 10.1016/j.jweia.2024.105904

Yu Li, Pu Feng, Jia-Xin Xiao, Ming Chen, Jia-Wu Li

In the complex wind environment of canyon regions, different kinds of bridge deck gratings (BDGs) are often used as novel aerodynamic countermeasures to improve the wind-resistance performance of long-span suspension footbridges. However, how to design reasonable BDGs to effectively improve the aerodynamic stability of long-span suspension footbridges is still an urgent problem to be solved, and there is no literature reporting on it. Therefore, in this study, according to a long-span suspension footbridge with a streamlined double-side box girder (SDSBG) and BDGs, the section models with different percentages of opening (β) and layouts of BDGs were made, and then the force- and vibration-measured tests were performed to study the influence of the layouts and β of BDGs on the aerostatic and flutter stability. Furthermore, the influence mechanism of BDGs on the flutter stability was investigated, and the optimal β and layouts of BDGs were also proposed. So, it is found that: when 0% ≤ β ≤ 22% (especially β = 11%), BDGs are unfavorable to the aerodynamic stability; when β ≥ 44%, the aerodynamic stability can be significantly improved by using BDGs; moreover, the layouts of Cases O (β reaches the maximum) and S (two strips of BDGs installed along the longitudinal direction) are more beneficial to the aerodynamic stability. Therefore, the optimal β and layouts of BDGs beneficial to the aerodynamic stability are β ≥ 44% and the layouts of Cases O and S, respectively, and the studies in this manuscript can provide a meaningful reference for the wind resistance design of long-span suspension footbridges in the future.

在峡谷地区复杂的风环境中，不同类型的桥面光栅（BDGs）常被用作新型气动对策，以改善大跨度悬索人行天桥的抗风性能。然而，如何设计合理的桥面格栅以有效提高大跨度悬索桥的气动稳定性仍是一个亟待解决的问题，目前尚无相关文献报道。因此，本研究根据流线型双侧箱梁（SDSBG）和BDGs的大跨度悬索人行天桥，制作了不同开孔率（β）和BDGs布置的截面模型，然后进行了测力和测振试验，研究了BDGs的布置和β对气动稳定性和飘移稳定性的影响。此外，还研究了 BDG 对扑翼稳定性的影响机理，并提出了最佳的 BDG β 和布局。结果表明：当 0% ≤ β ≤ 22% 时（尤其是 β = 11%），BDGs 对气动稳定性不利；当 β ≥ 44% 时，使用 BDGs 可显著提高气动稳定性；此外，O（β 达到最大值）和 S（沿纵向安装两条 BDGs）两种布局对气动稳定性更有利。因此，有利于气动稳定性的最佳β和北斗七星布局分别为β≥44%和情况O和S的布局，本文的研究可为今后大跨度悬索人行天桥的抗风设计提供有意义的参考。

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引用次数: 0

Buffeting performance of long-span bridges with different span affected by parametric typhoon wind 受参数台风影响的不同跨度大跨度桥梁的缓冲性能

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2024-09-28 DOI: 10.1016/j.jweia.2024.105903

Lin Zhao , Zilong Wang , Weile Chen , Wei Cui

Currently, typhoon-related performance of long span bridges usually focus on a specific wind record such as wind speed and turbulence intensity during a full typhoon, however, the inter-correlation among wind characteristic parameters under typhoon wind climate is ignored. The existing investigation about structural responses during typhoon attacks are still limited at case-study analysis, and hardly provide a generalized framework to evaluate the structural performance especially for typhoon landing whole process. This study utilizes the measured wind speeds of the strong typhoon "Hagupit" to establish a unified typhoon parametric model, during which the correlation of typhoon wind parameters including angle of attack (AoA), turbulence intensity, integral length scale and mean wind speed were taken into consideration. The measured typhoon process charactered with center-through effect with M-type average wind speed curve. Furthermore, the structural performance of long-span bridges with different spans from 1500 m to 2500 m main span was systematically studied. The aerodynamic parameters of the bridge deck section, including the aerostatic coefficients, flutter derivatives at different AoAs, and aerodynamic admittance under different oncoming flow conditions were identified through wind tunnel tests. Finally, the wind-induced buffeting performance was calculated by the buffeting frequency domain algorithm, showing various structural wind effect characteristics during the typhoon landing whole process. The maximal buffeting response is not necessarily related with the wind speed, and other wind characteristics especially turbulence intensity and AoA, etc. also affect on the results.

目前，与台风相关的大跨度桥梁性能通常集中于特定的风速记录，如台风全过程中的风速和湍流强度，但台风气候下风特性参数之间的相互关系却被忽视。现有关于台风袭击时结构响应的研究仍局限于案例分析，很难提供一个通用的框架来评估结构性能，尤其是台风登陆全过程的结构性能。本研究利用强台风 "黑格比 "的实测风速建立了统一的台风参数模型，其中考虑了台风风向参数的相关性，包括攻角（AoA）、湍流强度、积分长度尺度和平均风速。测得的台风过程具有中心穿越效应和 M 型平均风速曲线的特征。此外，还系统研究了主跨从 1500 米到 2500 米不同跨度的大跨度桥梁的结构性能。通过风洞试验确定了桥面截面的空气动力参数，包括空气静力学系数、不同AoAs下的扑翼导数以及不同来流条件下的空气动力导纳。最后，通过缓冲频域算法计算了风引起的缓冲性能，显示了台风登陆全过程中的各种结构风效应特征。最大缓冲响应与风速没有必然联系，其他风特性，尤其是湍流强度和AoA等也会对结果产生影响。

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引用次数: 0