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Theoretical model of ultimate shear capacity and flexural capacity design method of boundary elements for reinforced concrete frames with steel plate shear walls 钢板剪力墙钢筋混凝土框架边界元极限剪切承载力和抗弯承载力设计方法的理论模型
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-17 DOI: 10.1002/eqe.4234
Yonghui An, Shentong Lin, Jinping Ou

The steel plate shear walls (SPSWs) have been proven effective in reinforced concrete frames (RCFs) as a lateral force-resistant structure. Despite of advancements, accurately predicting the ultimate shear capacity of RCFs with SPSWs remains challenging using current simplified models. Additionally, the flexural capacity design procedure for the boundary elements (beams and columns) in previous studies of RCF-SPSWs involved intricate iterative procedures, hindering its widespread implementation. To address the two issues, this paper investigates the pushover responses and the plate-frame interaction (PFI) of an RCF-SPSWs system using theoretical and numerical methods. There are three main contributions. First, a theoretical model of ultimate shear capacity for RCF-SPSWs is proposed, which can also be used to predict shear contributions of boundary frames in RCF-SPSWs. Calculation errors for ultimate shear capacity of RCF-SPSWs and shear contribution from the boundary frame are only 3.7% and 6.7% respectively, which are reduced dramatically compared with the traditional model. A simplified schematic diagram for the global collapse mechanism (uniform distribution of plastic hinges within a structure) of RCF-SPSWs is developed to facilitate the calculation of internal work and reaction forces. Secondly, a flexural capacity design method for the boundary elements to avoid in-span plastic hinges is proposed. The proposed method enables the achievement of direct estimation of the flexural demands that could trigger a global collapse mechanism, all without intricate iterative procedures. The applicability of current assumptions for the design of steel boundary frame in RCF-SPSWs system is discussed, and engineering suggestions are provided to ensure safer and more economic designs. Comparison results confirmed the applicability of the proposed design method, which can be adopted to achieve the global collapse mechanism for RCF-SPSW system. Thirdly, impacts of yielding panel actions on the flexural capacity of boundary elements of RCF-SPSWs are clarified. Comparison results demonstrated that adding SPSWs to an RCF alters the axial force on boundary elements and significantly impacts the flexural capacity. A design suggestion is made to emphasize the importance of avoiding the balanced failure of boundary elements. The proposed theoretical model can be used to economize the cross-section of boundary elements in RCF-SPSWs system under seismic loads due to accurate prediction of their shear contribution; the proposed flexural capacity design method can achieve a global collapse mechanism, and thus the structural safety and energy dissipation capacity are improved; moreover, the building design efficiency is also improved due to avoidance of intricate iterative procedures.

钢板剪力墙(SPSWs)已被证明是钢筋混凝土框架(RCFs)中有效的抗侧力结构。尽管钢板剪力墙技术不断进步,但使用当前的简化模型准确预测钢板剪力墙 RCF 的极限抗剪能力仍具有挑战性。此外,在以往的研究中,RCF-SPSW 边界元素(梁和柱)的抗弯承载力设计程序涉及复杂的迭代程序,阻碍了其广泛实施。为了解决这两个问题,本文采用理论和数值方法研究了 RCF-SPSW 系统的推移响应和板框相互作用 (PFI)。本文有三个主要贡献。首先,本文提出了 RCF-SPSW 的极限剪力承载力理论模型,该模型也可用于预测 RCF-SPSW 中边界框架的剪力贡献。与传统模型相比,RCF-SPSW 的极限抗剪承载力和边界框架的剪力贡献计算误差分别仅为 3.7% 和 6.7%,大幅降低。针对 RCF-SPSW 的全局倒塌机制(塑性铰链在结构内部的均匀分布)绘制了简化示意图,以方便计算内功和反作用力。其次,提出了避免跨内塑性铰的边界元素抗弯承载力设计方法。所提出的方法能够直接估算可能引发整体坍塌机制的挠曲需求,而无需复杂的迭代程序。讨论了当前 RCF-SPSW 系统中钢边界框架设计假设的适用性,并提出了工程建议,以确保设计更安全、更经济。对比结果证实了所提设计方法的适用性,可用于实现 RCF-SPSW 系统的全局坍塌机制。第三,阐明了屈服面板作用对 RCF-SPSW 边界元素抗弯能力的影响。比较结果表明,在 RCF 中添加 SPSW 会改变边界元素上的轴向力,并对抗弯能力产生显著影响。设计建议强调了避免边界元件平衡破坏的重要性。所提出的理论模型可用于在地震荷载下精确预测 RCF-SPSWs 系统中边界构件的剪力贡献,从而节约边界构件的截面;所提出的抗弯承载力设计方法可实现全局倒塌机制,从而提高结构安全性和耗能能力;此外,由于避免了复杂的迭代程序,还提高了建筑设计效率。
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引用次数: 0
Enhancing operational performance assessment of structures with seismic response modification devices: The role of observability and symmetry analysis under limited sensor deployment 利用地震反应修正装置加强结构的运行性能评估:有限传感器部署下的可观测性和对称性分析的作用
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-16 DOI: 10.1002/eqe.4235
Xinhao He, Yu Lin, Dan Li, Shigeki Unjoh

To manage structural responses under various external forces, the increasing incorporation of seismic isolation and supplementary damping systems in modern civil engineering necessitates post-installation performance assessments. The challenge of accurately inferring system information from these complex dynamical structures, especially with limited sensor deployment, could be significant. From the perspective of solving inverse problems, this challenge hinges on constructing an input-output mapping that assures unique solutions, achievable through theoretical observability or symmetry analysis. We introduce a unified algorithm framework designed to accommodate various definitions of Lie derivatives, specifically for observability and symmetry analysis in dynamic systems with affine, non-affine, and unknown inputs—capabilities not fully achieved in previous studies. We demonstrate its application across typical dynamic scenarios, including both linear and nonlinear examples. We also present a numerical example featuring complex isolation systems with limited sensor layouts, illustrating how uniform convergence can be achieved in estimating all system states when an observable input-output mapping is utilized. Furthermore, an experimental example employing shaking table tests showcases the potential complications that arise when an unobservable input-output mapping is used.

为了管理各种外力作用下的结构响应,现代土木工程中越来越多地采用了隔震和辅助阻尼系统,这就需要进行安装后的性能评估。要从这些复杂的动态结构中准确推断出系统信息,尤其是在传感器部署有限的情况下,可能会面临巨大的挑战。从解决逆问题的角度来看,这一挑战取决于构建一个输入输出映射,以确保通过理论可观测性或对称性分析实现唯一的解决方案。我们引入了一个统一的算法框架,旨在适应各种李导数的定义,特别适用于具有仿射、非仿射和未知输入的动态系统中的可观测性和对称性分析--这些能力在以往的研究中并未完全实现。我们展示了其在典型动态场景中的应用,包括线性和非线性示例。我们还介绍了一个以传感器布局有限的复杂隔离系统为特色的数值示例,说明了在利用可观测的输入输出映射时,如何在估计所有系统状态时实现均匀收敛。此外,一个采用振动台测试的实验示例展示了在使用不可观测的输入输出映射时可能出现的复杂情况。
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引用次数: 0
A novel optimal design method for tuned mass dampers with elastic motion-limiting stoppers 带弹性限位挡块的调谐质量阻尼器的新型优化设计方法
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-13 DOI: 10.1002/eqe.4232
Gaoqiang Qu, Qigang Liang, Luyu Li, Xiaoyu Bai, Jinping Ou

Tuned Mass Dampers (TMDs) are commonly used passive control devices in practical engineering applications. However, motion-limiting stoppers are usually installed to control the excessive TMD displacement due to the building space limitation, resulting in piecewise nonlinearity and detuning of TMD. This paper studies the influence of elastic motion-limiting stoppers on the optimal design of TMDs through a piecewise stiffness TMD (PSTMD) model. Performance of a PSTMD with classical design is first investigated and proven to be ineffective. To optimize the PSTMD parameters, the motion of PSTMD is decoupled from the controlled structure, and the frequency response equation of PSTMD is obtained analytically through the averaging method. Subsequently, the solution of the optimal design frequency for PSTMD is transformed into the solution of the jump frequency in the frequency response equation. With the optimal frequency of PSTMDs, the optimal damping and control performance of PSTMDs are discussed and analyzed compared with classical linear design, which fully showcases the effectiveness of the novel design method. Finally, the effectiveness of the novel design method is verified using a nine-story benchmark frame structure, and the results demonstrate that the control performance of the optimal PSTMD can be improved by nearly 10%$10%$ under specific seismic excitation, compared to the PSTMD with classical linear method. In summary, the novel design method can effectively take into account the influence of piecewise nonlinearity caused by elastic motion-limiting stoppers and improve the optimal control performance of TMD in a more realistic engineering environment.

调谐质量阻尼器(TMD)是实际工程应用中常用的被动控制装置。然而,由于建筑空间的限制,为了控制 TMD 的过大位移,通常会安装限动阻尼器,从而导致 TMD 的片状非线性和失谐。本文通过片状刚度 TMD(PSTMD)模型,研究了弹性限位挡板对 TMD 优化设计的影响。首先研究了采用经典设计的 PSTMD 的性能,并证明其无效。为了优化 PSTMD 参数,将 PSTMD 的运动与受控结构解耦,并通过平均法解析得到 PSTMD 的频率响应方程。随后,将 PSTMD 最佳设计频率的解转化为频率响应方程中跳跃频率的解。有了 PSTMD 的最佳频率,与经典线性设计相比,讨论和分析了 PSTMD 的最佳阻尼和控制性能,充分展示了新型设计方法的有效性。最后,使用一个九层基准框架结构验证了新型设计方法的有效性,结果表明,在特定地震激励下,与采用经典线性方法的 PSTMD 相比,最优 PSTMD 的控制性能可提高近 10 % $10%/$。总之,新的设计方法可以有效地考虑弹性限动挡块引起的片状非线性影响,在更真实的工程环境中提高 TMD 的最优控制性能。
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引用次数: 0
Dynamic model of the UC San Diego NHERI six-degree-of-freedom large high-performance outdoor shake table 加州大学圣地亚哥分校 NHERI 六自由度大型高性能室外振动台动态模型
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-06 DOI: 10.1002/eqe.4224
Chin-Ta Lai, Joel P. Conte

The UC San Diego large high-performance outdoor shake table (LHPOST), which was commissioned on October 1, 2004 as a shared-use experimental facility of the National Science Foundation (NSF) Network for Earthquake Engineering Simulation (NEES) program, was upgraded from its original one degree-of-freedom (LHPOST) to a six-degree-of-freedom configuration (LHPOST6) between October 2019 and April 2022. A mechanics-based numerical model of the LHPOST6 able to capture the dynamics of the upgraded 6-DOF shake table system under bare table condition is presented in this paper. The model includes: (i) a rigid body kinematic model that relates the platen motion to the motions of the components attached to the platen, (ii) a hydraulic dynamic model that calculates the hydraulic actuator forces based on all fourth-stage servovalve spool positions, (iii) a hold-down strut model that determines the pull-down forces produced by the three hold-down struts, (iv) Bouc-Wen models utilized to represent the dissipative forces in the shake table system, and (v) a rigid body dynamic model borrowed from robotic analysis governing the translational and rotational motions of the platen subjected to the forces from the various components attached to the platen. Extensive validation against experimental data shows excellent agreement for tri-axial and six-axial earthquake shake table tests. This validated model can be coupled with finite element models of test specimens to study the interaction between the shake table system and the specimens, and it offers potential for enhancing motion tracking performance through off-line controller tuning or advanced control algorithm development.

美国加州大学圣地亚哥分校的大型高性能室外振动台(LHPOST)于 2004 年 10 月 1 日投入使用,是美国国家科学基金会(NSF)地震工程模拟网络(NEES)项目的共享实验设施,在 2019 年 10 月至 2022 年 4 月期间由原来的一自由度(LHPOST)升级为六自由度配置(LHPOST6)。本文介绍了基于力学的 LHPOST6 数值模型,该模型能够捕捉升级后的六自由度振动台系统在裸台条件下的动力学特性。该模型包括(i) 刚体运动学模型,将压盘运动与连接到压盘上的组件的运动联系起来;(ii) 液压动态模型,根据所有第四级伺服阀阀芯位置计算液压致动器力;(iii) 压紧支柱模型,确定三个压紧支柱产生的下拉力、(iv) 用于表示振动台系统耗散力的 Bouc-Wen 模型,以及 (v) 借鉴机器人分析的刚体动态模型,用于控制压盘在来自压盘上各部件的力的作用下的平移和旋转运动。根据实验数据进行的广泛验证表明,三轴和六轴地震振动台试验的结果非常吻合。这个经过验证的模型可以与试验试样的有限元模型相结合,研究振动台系统与试样之间的相互作用,并通过离线控制器调整或高级控制算法开发,为提高运动跟踪性能提供了可能性。
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引用次数: 0
Drivers to seismic hazard curve slope 地震危险曲线斜率的驱动因素
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-06 DOI: 10.1002/eqe.4226
Pasquale Cito, Iunio Iervolino

The slope of a linear approximation of a probabilistic seismic hazard curve, when it is represented in the log-log scale, is a key parameter for seismic risk assessment based on closed-form solutions, and other applications. On the other hand, it is observed that different hazard models can provide, at the same site, comparable ground shaking, yet appreciably different slopes for the same exceedance return period. Moreover, the slope at a given return period can increase or decrease from low- to high-hazardous sites, depending on the models the probabilistic seismic hazard analysis (PSHA) is based on. In the study, the sensitivity of the slope to the main model components involved in PSHA was explored, that is: the earthquake rate, the magnitude and source-to-site distance distributions, and the value of the residual of ground motion models (GMM). With reference to a generic site, affected by an ideal seismic source zone, where magnitude follows the Gutenberg-Richter (G-R) relationship, it was found that the local slope of hazard curve increases with the following factors in descending order of importance: (i) increasing distance from the source; (ii) decreasing maximum magnitude and increasing b$b$-value of the G-R model; (iii) increasing rate of earthquakes of interest; (iv) increasing residual of the GMM. These results help explain the systematic differences in hazard curve slopes found in three authoritative hazard models for Italy, and the related impact on simplified risk assessment.

地震危险概率曲线的线性近似斜率(以对数-对数表示)是基于闭合形式解法进行地震风险评估和其他应用的关键参数。另一方面,在同一地点,不同的地震危险性模型可以提供相似的地震动,但在相同的超限重现期,斜率却明显不同。此外,根据概率地震危险性分析(PSHA)所依据的模型,从低危险性场地到高危险性场地,特定重现期的坡度可能会增加或减少。本研究探讨了坡度对概率地震危险性分析所涉及的主要模型成分的敏感性,即:地震率、震级和震源到场地的距离分布,以及地面运动模型(GMM)的残差值。参照受理想震源带影响的一般地点,震级遵循古滕贝格-里希特(G-R)关系,研究发现危害曲线的局部斜率随以下因素的增加而增大,重要性依次递减:(i) 与震源的距离增大;(ii) 最大震级减小,G-R 模型的 b $b$ 值增大;(iii) 相关地震的发生率增大;(iv) GMM 的残差增大。这些结果有助于解释在意大利的三个权威灾害模型中发现的灾害曲线斜率的系统性差异,以及对简化风险评估的相关影响。
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引用次数: 0
Effect of data drift on the performance of machine-learning models: Seismic damage prediction for aging bridges 数据漂移对机器学习模型性能的影响:老化桥梁的地震损坏预测
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-06 DOI: 10.1002/eqe.4230
Mengdie Chen, Yewon Park, Sujith Mangalathu, Jong-Su Jeon

Machine-learning models play a crucial role in structural seismic risk assessment and facilitate decision-making by analyzing complex data patterns. However, the dynamic nature of real-world data introduces challenges, particularly data drift, which can significantly affect model performance. This adversely affects machine-learning models intended to aid emergency responders and disaster recovery teams. This study primarily focused on assessing the impact of column corrosion-induced data drift on the performance of machine-learning models for seismic risk assessment of bridges. The machine-learning model performance was evaluated with and without considering the impact of corrosion. The results revealed a significant decrease in prediction accuracy when the data drift effect was not considered. To address this challenge, this study proposes integrating principal component analysis-based anomaly detection to enhance the model performance. The optimized model considering drift demonstrates significant improvements in accuracy across corroded bridges aged 25, 50, and 75 years, with accuracy rates increasing from 90%, 85%, and 81% to 98%, 97%, and 96%, respectively.

机器学习模型在结构性地震风险评估中发挥着至关重要的作用,通过分析复杂的数据模式促进决策制定。然而,真实世界数据的动态性质带来了挑战,尤其是数据漂移,会严重影响模型性能。这对旨在帮助应急响应人员和灾难恢复团队的机器学习模型产生了不利影响。本研究主要侧重于评估柱腐蚀引起的数据漂移对用于桥梁地震风险评估的机器学习模型性能的影响。在考虑和不考虑腐蚀影响的情况下,对机器学习模型的性能进行了评估。结果表明,在不考虑数据漂移影响的情况下,预测准确率会明显下降。为应对这一挑战,本研究提出整合基于主成分分析的异常检测,以提高模型性能。考虑了漂移的优化模型在 25 年、50 年和 75 年的腐蚀桥梁上的准确性有了显著提高,准确率分别从 90%、85% 和 81% 提高到 98%、97% 和 96%。
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引用次数: 0
Experimental and numerical investigations on the influence of transverse beams and slab on the seismic behavior of non-seismically designed exterior beam-column joints 横梁和楼板对非抗震设计外部梁柱连接处抗震行为影响的实验和数值研究
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-05 DOI: 10.1002/eqe.4228
Margaritis Tonidis, Akanshu Sharma, Veit Birtel

The study presents experimental and numerical results on two-dimensional and three-dimensional full-scale exterior non-seismically designed (NSD) reinforced concrete (RC) beam-column joint subassemblies subjected to quasi-static cyclic lateral loading. The tests were augmented by detailed 3D finite element modeling to obtain further information about the joint behavior. Through these systematic investigations and their detailed evaluation, clear conclusions could be drawn on the effect of transverse beams and slab on the overall seismic behavior of beam-column joints, where the joint core was devoid of transverse reinforcement. It was found that the presence of transverse beams enhanced both the ultimate joint shear strength and joint shear strength at first joint cracking. The crack development in concrete revealed that the diagonal joint shear cracks extended from the joint core into the transverse beams. The slab participation under flexure, when acting in tension, decreased with increase in drift due to intervening loss in joint stiffness, which was inconsistent with the observations in subassemblies where the joints were confined with transverse reinforcement. It was found that the inclined cracking in the transverse beams was caused due to joint shear stresses and aggravated due to torsional stresses when a slab was present. Normalized joint shear stress and principal tensile stress values were evaluated for first joint shear cracking and ultimate joint shear strength. These values may be useful for the seismic assessment of non-seismically designed beam-column joints with transverse beams and slab.

该研究介绍了二维和三维全尺寸外部非抗震设计(NSD)钢筋混凝土(RC)梁柱连接组件在承受准静态循环侧向荷载时的实验和数值结果。这些试验通过详细的三维有限元建模进行补充,以获得有关连接行为的更多信息。通过这些系统的研究和详细的评估,可以得出明确的结论,即横向梁和板对没有横向钢筋的梁柱连接整体抗震性能的影响。研究发现,横梁的存在提高了接头的极限抗剪强度和接头首次开裂时的抗剪强度。混凝土裂缝的发展表明,斜接缝剪切裂缝从接缝核心延伸到横梁。在拉力作用下,板在挠曲下的参与随漂移的增加而减少,这是由于连接刚度的损失造成的,这与在连接处用横向钢筋限制的组件中观察到的情况不一致。研究发现,横向梁的倾斜开裂是由连接剪应力引起的,而当有板存在时,则会因扭转应力而加剧。对首次接头剪切开裂和极限接头剪切强度的归一化接头剪应力和主拉应力值进行了评估。这些值可能有助于对横梁和板的非抗震设计梁柱连接进行抗震评估。
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引用次数: 0
A comprehensive categorization method for identifying near-fault pulse-like ground motions 识别近断层脉冲地动的综合分类方法
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-04 DOI: 10.1002/eqe.4225
Yongbo Peng, Renjie Han

Identifying near-fault pulse-like ground motions from extensive ground motion databases holds paramount importance, as it provides a pivotal foundation for further inquiries into this specific type of ground motions, including the modeling of such stochastic processes as well as thorough analysis of their potential impact on structures and infrastructure systems. Currently, a diverse array of quantitative methods for identifying pulse-like ground motions have emerged, all of which demonstrate good accuracy within their respective research scopes. However, due to the limitations of each individual method in identifying specific cases, these diverse approaches often yield inconsistent results for certain ground motion records, posing a significant challenge in establishing a reliable classification criterion that relies solely on a single identification method. To address this issue, the present study adopts a multifaceted approach. Instead of improving a single time-frequency analysis-based identification method, it carefully conducts a selection of seven baseline methods through a systematic overview of the field. By leveraging the analytic hierarchy process (AHP), a comprehensive categorization method is developed that integrates the strengths of each approach, resulting in a more robust and credible classification criterion. According to the devised category indicator, ground motions can be classified into four categories: Category A comprises definitively pulse-like ground motions; Category B comprises apparently pulse-like ground motions; Category C consists of probably pulse-like ground motions; and Category D encompasses ground motions unlikely to exhibit pulse-like characteristics. It provides a more elaborate classification beyond the binary distinction of pulse-like and non-pulse-like ground motions associated with traditional onefold classification methods. For validation purposes, a basic dataset comprising near-fault ground motion records from the NGA-West 2 database has been utilized. To verify the comprehensive categorization method, two datasets of pulse-like ground motion records suggested by FEMA and PEER and one dataset of ground motion records collected during the 1999 Chi-Chi earthquake are addressed. Numerical examples illustrate the remarkable effectiveness of the proposed method in identifying near-fault pulse-like ground motions based on their varying degrees of pulse-like characteristics.

从广泛的地面运动数据库中识别近断层脉冲样地面运动具有极其重要的意义,因为它为进一步研究这种特定类型的地面运动提供了关键基础,包括对这种随机过程进行建模,以及对其对结构和基础设施系统的潜在影响进行全面分析。目前,已经出现了一系列用于识别脉冲地动的定量方法,所有这些方法都在各自的研究范围内表现出良好的准确性。然而,由于每种方法在识别特定情况时存在局限性,这些不同的方法往往会对某些地动记录产生不一致的结果,这对建立仅依赖于单一识别方法的可靠分类标准构成了巨大挑战。为解决这一问题,本研究采用了一种多元方法。它没有改进单一的基于时频分析的识别方法,而是通过对该领域的系统概述,对七种基准方法进行了仔细的筛选。通过利用层次分析法(AHP),开发出一种综合分类方法,整合了每种方法的优势,从而形成一种更稳健、更可信的分类标准。根据设计的类别指标,地面运动可分为四类:A 类包括明确的脉冲样地动;B 类包括明显的脉冲样地动;C 类包括可能的脉冲样地动;D 类包括不可能表现出脉冲样特征的地动。它提供了一种更精细的分类方法,超越了与传统单倍分类方法相关的脉冲样地动和非脉冲样地动的二元区分。为了验证,我们使用了一个基本数据集,其中包括来自 NGA-West 2 数据库的近断层地动记录。为了验证综合分类方法,还使用了由 FEMA 和 PEER 建议的两个脉冲样地震动记录数据集和 1999 年 Chi-Chi 地震期间收集的一个地震动记录数据集。数值示例说明了所提方法在根据不同程度的脉冲样特征识别近断层脉冲样地动方面的显著效果。
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引用次数: 0
Seismic risk prioritization of masonry building stocks using machine learning 利用机器学习确定砌体建筑群的地震风险优先次序
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-04 DOI: 10.1002/eqe.4227
Onur Coskun, Rafet Aktepe, Alper Aldemir, Ali Erhan Yilmaz, Murat Durmaz, Burcu Guldur Erkal, Engin Tunali

The seismic risk mitigation plans are vital since vulnerable structures are prone to partial or total collapse under the effect of future major earthquake events. Therefore, vulnerable structures in large building stocks should be determined using robust and accurate methods to prevent loss of lives and property. In the current state-of-the-art, the risk states (i.e., whether risky or not) of structures completely depend on the experience of the reconnaissance team of engineers, which could not result in standardized decisions. In this study, machine learning has been integrated into the decision-making algorithm to classify more precise and reliable seismic risk states of masonry buildings, categorizing them into up to four risk categories. For this purpose, a large database, including 12 features and detailed seismic risk analysis results of 4356 masonry buildings, is formed. Firstly, the input variables are preprocessed using feature engineering methods. Then, several machine learning algorithms are utilized to produce a network to estimate the risk state of masonry buildings in association with the risk states obtained from the detailed analysis results. As a result of the analysis of these algorithms, the correct prediction percentages for the testing database of the proposed method for two, three, and four risk states classification are predicted as approximately 87.5%, 86.6%, and 79.0%, respectively. This new approach makes it possible to produce risk color maps of large building stocks and reduce the number of buildings that require immediate action.

地震风险缓解计划至关重要,因为在未来大地震事件的影响下,易损结构很容易部分或全部倒塌。因此,应采用稳健、准确的方法确定大型建筑群中的易损结构,以防止生命和财产损失。在目前最先进的技术中,结构的风险状态(即是否有风险)完全依赖于勘察工程师团队的经验,无法形成标准化的决策。本研究将机器学习融入决策算法中,对砌体建筑的地震风险状态进行更精确、更可靠的分类,最多可分为四个风险类别。为此,建立了一个大型数据库,其中包括 12 个特征和 4356 栋砌体建筑的详细地震风险分析结果。首先,使用特征工程方法对输入变量进行预处理。然后,利用几种机器学习算法生成一个网络,结合从详细分析结果中获得的风险状态来估计砌体建筑的风险状态。通过对这些算法的分析,所提出方法的测试数据库对两种、三种和四种风险状态分类的预测正确率分别约为 87.5%、86.6% 和 79.0%。这种新方法使绘制大型建筑群的风险颜色图成为可能,并减少了需要立即采取行动的建筑数量。
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引用次数: 0
BN-based seismic risk analysis and mitigation strategy for UHV converter station 基于 BN 的特高压换流站地震风险分析与缓解策略
IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Pub Date : 2024-09-04 DOI: 10.1002/eqe.4229
Siyuan Wu, Xiao Liu, Junhan Chen, Qiang Xie

Ultra-high voltage (UHV) converter stations are critical nodes in power grids. This paper proposes a probabilistic framework for assessing and mitigating the seismic risk of UHV converter station systems to enhance the seismic performance of the grid. First, a Bayesian network model for the system functionality of UHV converter stations was established based on the enumeration of equipment failure scenarios. Conditional probability tables (CPTs) were used to represent the causal relationship among subsystems and system functionality. Inference calculations were conducted using Bayes’ theorem. Then, the definition of system seismic loss risk distribution was proposed to assess the seismic risk of the system over its entire lifespan. The feasibility of this framework was validated using a specific UHV converter station, yielding analytical solutions for the probability distribution of system functionality and seismic vulnerability curves. Additionally, the cost-effectiveness of several risk mitigation strategies was assessed. A cost-benefit analysis was performed from the perspectives of both the expected loss of a single earthquake and the life-cycle cost. The framework comprehensively considered the constraints imposed by series, parallel, and bypass control devices on the system's functionality. It was revealed that the seismic loss risk for UHV converter stations exhibits a characteristic of low probability but high loss.

特高压(UHV)换流站是电网的关键节点。本文提出了一种概率框架,用于评估和减轻特高压换流站系统的地震风险,以提高电网的抗震性能。首先,在列举设备故障情况的基础上,建立了特高压换流站系统功能的贝叶斯网络模型。使用条件概率表(CPT)来表示子系统和系统功能之间的因果关系。使用贝叶斯定理进行推理计算。然后,提出了系统地震损失风险分布的定义,以评估系统在整个生命周期内的地震风险。利用一个特定的超高压换流站验证了这一框架的可行性,得出了系统功能概率分布和地震脆弱性曲线的分析解决方案。此外,还对几种风险缓解策略的成本效益进行了评估。从单次地震的预期损失和生命周期成本两个角度进行了成本效益分析。该框架全面考虑了串联、并联和旁路控制装置对系统功能的限制。结果表明,特高压换流站的地震损失风险呈现出低概率、高损失的特点。
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Earthquake Engineering & Structural Dynamics
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