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Impact Damage Identification of Aluminum Alloy Reinforced Plate Based on GWO-ELM Algorithm 基于GWO-ELM算法的铝合金增强板冲击损伤识别
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.025989
Wei Li, Benjian Zou, Yuxiang Luo, Ning Yang, Faye Zhang, Mingshun Jiang, Lei Jia
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引用次数: 0
An Analysis of the Dynamic Behavior of Damaged Reinforced Concrete Bridges under Moving Vehicle Loads by Using the Moving Mesh Technique 用动网格技术分析移动车辆荷载作用下钢筋混凝土损伤桥梁的动力特性
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.030075
Fabrizio Greco, Paolo Lonetti, Arturo Pascuzzo, Giulia Sansone
This work proposes a numerical investigation on the effects of damage on the structural response of Reinforced Concrete (RC) bridge structures commonly adopted in highway and railway networks. An effective three-dimensional FE-based numerical model is developed to analyze the bridge’s structural response under several damage scenarios, including the effects of moving vehicle loads. In particular, the longitudinal and transversal beams are modeled through solid finite elements, while horizontal slabs are made of shell elements. Damage phenomena are also incorporated in the numerical model according to a smeared approach consistent with Continuum Damage Mechanics (CDM). In such a context, the proposed method utilizes an advanced and efficient computational strategy for reproducing Vehicle-Bridge Interaction (VBI) effects based on a moving mesh technique consistent with the Arbitrary Lagrangian-Eulerian (ALE) formulation. The proposed model adopts a moving mesh interface for tracing the positions of the contact points between the vehicle’s wheels and the bridge slabs. Such modeling strategy avoids using extremely refined discretization for structural members, thus drastically reducing computational efforts. Vibrational analyses in terms of damage scenarios are presented to verify how the presence of damage affects the natural frequencies of the structural system. In addition, a comprehensive investigation regarding the response of the bridge under moving vehicles is developed, also providing results in terms of Dynamic Amplification Factor (DAFs) for typical design bridge variables.
本文对公路和铁路网络中常用的钢筋混凝土桥梁结构的损伤对结构响应的影响进行了数值研究。建立了一种有效的基于有限元的三维数值模型,分析了桥梁在几种损伤情况下的结构响应,包括移动车辆荷载的影响。特别是,纵向和横向梁通过实体有限元建模,而水平板由壳单元组成。根据连续损伤力学(CDM)的涂抹方法,将损伤现象纳入数值模型。在这种情况下,该方法采用了一种先进而高效的计算策略,基于与任意拉格朗日-欧拉(ALE)公式一致的移动网格技术来再现车桥相互作用(VBI)效应。该模型采用移动网格界面跟踪车辆车轮与桥板接触点的位置。这种建模策略避免了对结构构件进行极其精细的离散化,从而大大减少了计算量。根据损伤情况进行振动分析,以验证损伤的存在如何影响结构系统的固有频率。此外,对桥梁在车辆作用下的响应进行了全面的研究,并提供了典型设计桥梁变量的动力放大系数(daf)的结果。
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引用次数: 0
Low-Strain Damage Imaging Detection Experiment for Model Pile Integrity Based on HHT 基于HHT的模型桩完整性低应变损伤成像检测实验
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.042393
Ziyang Jiang, Ziping Wang, Kan Feng, Yang Zhang, Rahim Gorgin
With the advancement of computer and mathematical techniques, significant progress has been made in the 3D modeling of foundation piles. Existing methods include the 3D semi-analytical model for non-destructive low-strain integrity assessment of large-diameter thin-walled pipe piles and the 3D soil-pile dynamic interaction model. However, these methods have complex analysis procedures and substantial limitations. This paper introduces an innovative and streamlined 3D imaging technique tailored for the detection of pile damage. The approach harnesses the power of an eight-channel ring array transducer to capture internal reflection signals within foundation piles. The acquired signals are subsequently processed using the Hilbert-Huang Transform (HHT), a robust analytical tool known for its effectiveness in handling non-stationary signals. Through the development of a sophisticated multi-channel ring array imaging algorithm, this technique empowers engineers and researchers to identify various pile defects, including their specific type, precise location, and obtain detailed 3D imaging representations. The findings of this research offer a valuable blend of theoretical insights and practical guidance, significantly advancing the state-of-the-art in the realm of concrete pile integrity inspection. By simplifying and enhancing the assessment process, this innovative approach not only addresses the complexities of existing methods but also contributes to the overall safety and reliability of concrete engineering structures.
随着计算机和数学技术的进步,基础桩的三维建模取得了重大进展。现有的方法包括大直径薄壁管桩无损低应变完整性评价的三维半解析模型和三维土-桩动力相互作用模型。然而,这些方法有复杂的分析程序和很大的局限性。本文介绍了一种专为桩基损伤检测而设计的创新型流线型三维成像技术。该方法利用八通道环形阵列换能器的功率来捕获基桩内的内部反射信号。采集的信号随后使用希尔伯特-黄变换(HHT)进行处理,这是一种鲁棒的分析工具,以其处理非平稳信号的有效性而闻名。通过开发复杂的多通道环形阵列成像算法,该技术使工程师和研究人员能够识别各种桩缺陷,包括其具体类型,精确位置,并获得详细的3D成像表示。本研究结果提供了有价值的理论见解和实践指导,显著推进了混凝土桩完整性检测领域的最新技术。通过简化和加强评估过程,这种创新的方法不仅解决了现有方法的复杂性,而且有助于混凝土工程结构的整体安全性和可靠性。
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引用次数: 0
Paradigm of Numerical Simulation of Spatial Wind Field for Disaster Prevention of Transmission Tower Lines 输电塔线路空间风场防灾数值模拟范式
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.029850
Yongxin Liu, Puyu Zhao, Jianxin Xu, Xiaokai Meng, Hong Yang, Bo He
Numerical simulation of the spatial wind field plays a very important role in the study of wind-induced response law of transmission tower structures. A reasonable construction of a numerical simulation method of the wind field is conducive to the study of wind-induced response law under the action of an actual wind field. Currently, many research studies rely on simulating spatial wind fields as Gaussian wind, often overlooking the basic non-Gaussian characteristics. This paper aims to provide a comprehensive overview of the historical development and current state of spatial wind field simulations, along with a detailed introduction to standard simulation methods. Furthermore, it delves into the composition and unique characteristics of spatial winds. The process of fluctuating wind simulation based on the linear filter AR method is improved by introducing spatial correlation and non-Gaussian distribution characteristics. The numerical simulation method of the wind field is verified by taking the actual transmission tower as a calculation case. The results show that the method summarized in this paper has a broader application range and can effectively simulate the actual spatial wind field under various conditions, which provides a valuable data basis for the subsequent research on the wind-induced response of transmission tower lines.
空间风场的数值模拟对于研究输电塔结构的风致响应规律具有十分重要的意义。合理构建风场数值模拟方法,有利于研究实际风场作用下的风致响应规律。目前,许多研究都是将空间风场模拟为高斯风,往往忽略了空间风场的基本非高斯特征。本文旨在全面概述空间风场模拟的历史发展和现状,并详细介绍了标准模拟方法。进一步探讨了空间风的组成和独特特征。通过引入空间相关性和非高斯分布特性,改进了基于线性滤波AR方法的脉动风模拟过程。以实际输电塔为算例,验证了风场的数值模拟方法。结果表明,本文总结的方法具有更广泛的应用范围,可以有效地模拟各种条件下的实际空间风场,为后续输电塔线路的风致响应研究提供了有价值的数据基础。
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引用次数: 0
Influence of Vertical Irregularity on the Seismic Behavior of Base Isolated RC Structures with Lead Rubber Bearings under Pulse-Like Earthquakes 脉动地震作用下竖向不规则性对铅橡胶支座基础隔震RC结构抗震性能的影响
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.028686
Ali Mahamied, Amjad A. Yasin, Yazan Alzubi, Jamal Al Adwan, Issa Mahamied
Nowadays, an extensive number of studies related to the performance of base isolation systems implemented in regular reinforced concrete structures subjected to various types of earthquakes can be found in the literature. On the other hand, investigations regarding the irregular base-isolated reinforced concrete structures’ performance when subjected to pulse-like earthquakes are very scarce. The severity of pulse-like earthquakes emerges from their ability to destabilize the base-isolated structure by remarkably increasing the displacement demands. Thus, this study is intended to investigate the effects of pulse-like earthquake characteristics on the behavior of low-rise irregular base-isolated reinforced concrete structures. Within the study scope, investigations related to the impact of the pulse-like earthquake characteristics, irregularity type, and isolator properties will be conducted. To do so, different values of damping ratios of the base isolation system were selected to investigate the efficiency of the lead rubber-bearing isolator. In general, the outcomes of the study have shown the significance of vertical irregularity on the performance of base-isolated structures and the considerable effect of pulse-like ground motions on the buildings’ behavior.
目前,在文献中可以找到大量与常规钢筋混凝土结构中实施的基础隔震系统在各种类型地震下的性能有关的研究。另一方面,关于不规则基础隔震钢筋混凝土结构在脉动地震作用下的性能研究非常少。脉冲型地震的严重程度来自于它们通过显著增加位移需求来破坏基础隔离结构的能力。因此,本研究旨在探讨脉动地震特征对低层不规则基础隔震钢筋混凝土结构性能的影响。在研究范围内,将进行脉动地震特征、不规则性类型和隔震性能影响的相关研究。为此,选取不同阻尼比值的基础隔震系统来研究铅橡胶隔震器的效率。总的来说,研究结果表明了垂直不均匀性对基础隔震结构性能的重要性,以及脉冲式地震动对建筑物性能的相当大的影响。
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引用次数: 0
A Monitoring Method for Transmission Tower Foots Displacement Based on Wind-Induced Vibration Response 基于风振响应的输电塔脚位移监测方法
Q2 Engineering Pub Date : 2023-01-01 DOI: 10.32604/sdhm.2023.029760
Zhicheng Liu, Long Zhao, Guanru Wen, Peng Yuan, Qiu Jin
The displacement of transmission tower feet can seriously affect the safe operation of the tower, and the accuracy of structural health monitoring methods is limited at the present stage. The application of deep learning method provides new ideas for structural health monitoring of towers, but the current amount of tower vibration fault data is restricted to provide adequate training data for Deep Learning (DL). In this paper, we propose a DT-DL based tower foot displacement monitoring method, which firstly simulates the wind-induced vibration response data of the tower under each fault condition by finite element method. Then the vibration signal visualization and Data Transfer (DT) are used to add tower fault data samples to solve the problem of insufficient actual data quantity. Subsequently, the dynamic response test is carried out under different tower fault states, and the tower fault monitoring is carried out by the DL method. Finally, the proposed method is compared with the traditional online monitoring method, and it is found that this method can significantly improve the rate of convergence and recognition accuracy in the recognition process. The results show that the method can effectively identify the tower foot displacement state, which can greatly reduce the accidents that occurred due to the tower foot displacement.
输电塔脚位移严重影响塔的安全运行,现阶段结构健康监测方法的准确性有限。深度学习方法的应用为塔架结构健康监测提供了新的思路,但目前塔架振动故障数据量有限,无法为深度学习(DL)提供足够的训练数据。本文提出了一种基于DT-DL的塔脚位移监测方法,该方法首先用有限元法模拟了塔在各种故障状态下的风振响应数据。然后利用振动信号可视化和数据传输(DT)技术对塔故障数据样本进行添加,解决实际数据量不足的问题。随后,对塔架进行了不同故障状态下的动态响应试验,并采用DL方法对塔架进行故障监测。最后,将提出的方法与传统的在线监测方法进行对比,发现该方法在识别过程中能够显著提高收敛速度和识别精度。结果表明,该方法能有效识别塔脚位移状态,可大大减少因塔脚位移而发生的事故。
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引用次数: 0
Aluminum Alloy Fatigue Crack Damage Prediction Based on Lamb Wave-Systematic Resampling Particle Filter Method 基于Lamb波-系统重采样粒子滤波法的铝合金疲劳裂纹损伤预测
Q2 Engineering Pub Date : 2022-01-01 DOI: 10.32604/sdhm.2022.016905
Gaozheng Zhao, Chang Liu, L. Sun, Ning Yang, Lei Zhang, Mingshun Jiang, L. Jia, Q. Sui
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引用次数: 0
Health Monitoring-Based Assessment of Reinforcement with Prestressed Steel Strand for Cable-Stayed Bridge 基于健康监测的斜拉桥预应力钢绞线加固评估
Q2 Engineering Pub Date : 2022-01-01 DOI: 10.32604/sdhm.2021.016130
Kexin Zhang, T. Qi, Dachao Li, X. Xue, Yanfeng Li
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引用次数: 2
Shape Sensing of Thin Shell Structure Based on Inverse Finite Element Method 基于逆有限元法的薄壳结构形状感知
Q2 Engineering Pub Date : 2022-01-01 DOI: 10.32604/sdhm.2022.019554
Zhanjun Wu, T. Li, Jiachen Zhang, Yifan Wu, Jianle Li, Lei Yang, Hao Xu
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引用次数: 0
The Coupled Effect of Temperature Changes and Damage Depth on Natural Frequencies in Beam-Like Structures 温度变化和损伤深度对类梁结构固有频率的耦合影响
Q2 Engineering Pub Date : 2022-01-01 DOI: 10.32604/sdhm.2022.020418
Tareq Al-hababi, Nizar Faisal Alkayem, Li Cui, Shixiang Zhang, Cong Liu, M. Cao
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引用次数: 3
期刊
SDHM Structural Durability and Health Monitoring
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