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Machine learning based damage state identification:A novel perspective on fragility analysis for nuclear power plants considering structural uncertainties

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Earthquake engineering and engineering Vibration 2025年第1期24卷 201-222页

作者： Zheng Zhi Wang Yong Pan Xiaolan Ji Duofa College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

Seismic fragility analysis(SFA)is known as an effective probabilistic-based approach used to evaluate seismic *** are various sources of uncertainties associated with this approach.A nuclear power plant(NPP)system is an extremely important infrastructure and contains many structural uncertainties due to construction issues or structural deterioration during *** of structural uncertainties effects is a costly and time-consuming endeavor.A novel approach to SFA for the NPP considering structural uncertainties based on the damage state is proposed and *** results suggest that considering the structural uncertainties is essential in assessing the fragility of the NPP structure,and the impact of structural uncertainties tends to increase with the state of ***,machine learning(ML)is found to be superior in high-precision damage state identification of the NPP for reducing the time of nonlinear time-history analysis(NLTHA)and could be applied in the damage state-based ***,the impact of various sources of uncertainties is investigated through sensitivity *** Sobol and Shapley additive explanations(SHAP)method can be complementary to each other and able to solve the problem of quantifying seismic and structural uncertainties simultaneously and the interaction effect of each parameter.

关键词： seismic fragility analysis damage state structural uncertainties machine learning sensitivity analysis

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From earthquake resistance structure to earthquake resilience city–urban seismic resilience assessment

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Earthquake engineering and engineering Vibration 2025年第1期24卷 1-13页

作者： Xie Lili Zhao Yonggang Wen Weiping Zhai Changhai Key lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

Earthquakes pose significant perils to the built environment in urban *** avert the calamitous aftermath of earthquakes,it is imperative to construct seismic resilient *** to the intricacy of the concept of urban seismic resilience(USR),its assessment is a large-scale system engineering *** assessment of USR should be based on the notion of urban seismic capacity(USC)assessment,which includes casualties,economic loss,and recovery time as *** loss is also included in the assessment of USR in addition to these *** assessment indicator system comprising five dimensions(building and lifeline infrastructure,environment,society,economy,and institution)and 20 indicators has been devised to quantify *** analytical hierarchy process(AHP)is utilized to compute the weights of the criteria,dimensions,and indicators in the urban seismic resilience assessment(USRA)indicator *** the necessary data for a city are obtainable,the seismic resilience of that city can be assessed using this *** illustrate the proposed methodology,a moderate-sized city in China was selected as a case *** assessment results indicate a high level of USR,suggesting that the city possesses strong capabilities to withstand and recover from potential future earthquakes.

关键词： urban seismic capacity urban seismic resilience assessment analytic hierarchy process functionality loss

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Very high cycle fatigue resistance improvement of Mg-Gd-Zn-Zr alloy by introducing curved long-period stacking ordered lamellae

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Journal of Magnesium and Alloys 2025年第3期13卷 1218-1231页

作者： Min Zhan Xinglin Yang Shoucheng Shi Yao Chen Lang Li Bing Xue Yongbo Li Wanshuang Yi Qingyuan Wang Chao He Key Laboratory of Deep Earth Science and Engineering Ministry of EducationCollege of Architecture and EnvironmentSichuan UniversityChengdu 610065China Failure Mechanics&Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China Science and Technology Research Center China Yangtze Power Corp(CYPC)Yichang Hubei 443002China Hubei Technology Innovation Center for Smart Hydropower Wuhan Hubei 430000China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

Magnesium alloys with long-period stacking ordered(LPSO)structures are known for their impressive static mechanical strength,but the consistent occurrence of slip-cracking along the LPSO lamellae,which do not effectively impede the movement of basal dislocations,has prompted concerns about their very high cycle fatigue(VHCF)*** this study,an extruded Mg-Gd-Zn-Zr alloy was developed,showcasing exceptional VHCF resistance due to its bimodal structure comprisingﬁne grains and coarse grains consisting of curved LPSO *** investigation on the crack initiation mechanism revealed that slip-induced cracking predominantly occurs inﬁne-grained regions rather than in the interior of coarse *** extrusion process aligns the basal planes of most coarse grains parallel to the axial direction,and the presence of curved LPSO lamellae acts as barriers to the movement of basal dislocations,thereby effectively increasing the threshold for slip-cracking along the basal ***,fatigue damage manifests in the form of slip bands and micro-cracks within the interior ofﬁne grains,ultimately resulting in fatigue crack initiation,propagation andﬁnal fracture.

关键词： Very high cycle fatigue Mg-Gd-Zn-Zr alloy Crack initiation Curved LPSO lamellae Micro-cracks

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General Effect of Internal Span of U-shaped Stud on UHPC-NC Interfacial Failure Load 9th

General Effect of Internal Span of U-shaped Stud on UHPC-NC ...

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9th International Conference on civil engineering and Materials Science, ICCEMS 2024

作者： Wu, Zhongchong Liu, Dayong Wu, Xiangguo Zhang, Yun Wu, Chengen Lin, Lanri Zhong, Jing Zhu, Hongbing Zhou, Ruiquan You, Xianhui CGN New Energy Holdings Co. Ltd. Beijing China Fujian Provincial Key Laboratory of Multi-Disasters Prevention and Mitigation in Civil Engineering College of Civil Engineering Fuzhou University Fuzhou350108 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of the Industry and Information Technology Harbin Institute of Technology Harbin150090 China College of Civil Engineering Fuzhou University Fuzhou350108 China Sinovel Wind Group Co. Ltd Beijing100086 China Shanghai Electric Wind Power Group Co. Ltd Shanghai200233 China Wind Power Hybrid Tower Co. Ltd Fulaerji161042 China China Power Engineering Consulting Group CO. LTD Beijing100120 China

ISBN: (纸本)9789819615735

To improve the durability design level of the foundation bearing platform for offshore fixed wind power, Ultra-high performance concrete (UHPC) is used as a non-demolding membrane shell system, and a high-performance composite concrete bearing platform structure is formed with on-site pouring of core concrete. The interface performance between the prefabricated UHPC membrane shell and the post cast core concrete has become an important aspect of the overall integrity of the high-performance composite concrete bearing platform. The use of interface shear key design to improve interface integrity is necessary for improving the overall stress of the bearing platform structure. The objective of this study is to assess the effect of the internal span on the shear behavior at the junction of UHPC and normal concrete (NC). © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Ultra-high performance concrete

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A two-dimensional coupled energy-mass transfer model for simulating rain-on-snow load dynamics on roofs

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Cold Regions Science and Technology 2025年 238卷

作者： Zhang, Qingwen Bajracharya, Diwas Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Climate changes have led to an increase in the frequency and severity of rain-on-snow (ROS) events, risking structural safety with increasing roof snow loads. These events involve melting, freezing, and compaction induced by water infiltration in roof snowpacks. Existing models assume snow as a homogeneous medium with uniform ROS load distribution while ignoring critical phenomena like phase changes, heterogeneity, and evolution of snowpack's properties that alter water retention in snow. Although snow load is adjusted based on slope and roof geometry, these adjustments are not considered for ROS surcharge load. A two-dimensional coupled energy-mass (EM) transfer model using the Multi-point Flux Approximation method (MPFA) is employed to simulate ROS load on sloped roofs along with heat exchange, melting, refreezing, and compaction effects. Compared to simplified mass transfer models, the EM transfer model exhibits superior predictive capabilities when evaluated against experimental results. Although melting and compaction significantly increased the density, reducing porosity and permeability, the melted water accelerated saturation at the bottom boundary, enabling quicker outflow conditions. A non-uniform triangular water retention pattern at the lower roof edge was observed in both models, suggesting that heterogeneity has minimal impact on the water retention profile. Under the studied ROS load conditions, the ROS load at the roof edge is 1.6 times the overall ROS load due to non-uniform water retention. The study highlights the inadequacy of existing design code as the design ROS load is inapplicable to the studied ROS condition, despite localized loads being close to design ROS load (0.38 kN/m2). © 2025

关键词： Osmosis

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A novel porous shock absorption layer for tunnels: Shock absorption performance and parameter analysis

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Earthquake engineering and engineering Vibration 2025年第2期24卷 437-450页

作者： Zhou Tonglai Dong Changsong Li Shuang Sun Qiangqiang Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China State Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment CCCC First Highway Consultants Co.Ltd.Xi’an 710075China Institute of Geotechnical Engineering College of Civil Engineering and ArchitectureHebei UniversityBaoding 017002China

A novel porous shock absorption layer is put forward in this study, and the shock absorption performance of the porous shock absorption layer is evaluated based on three-dimensional pseudo-static analysis. The modified reaction acceleration method is adopted and validated in the three-dimensional model. Seven ground motions are selected and the peak ground acceleration is adjusted to 0.2 g, 0.4 g and 0.6 g. The impact of the void ratio and thickness of the porous shock absorption layer is studied, while the surrounding rock grade and tunnel depth are also investigated. The numerical results show that the porous shock absorption layer has good shock absorption performance and can effectively reduce the maximum internal force of the secondary lining, but it cannot reduce the maximum horizontal relative displacement of the secondary lining. The circumferential rubber strip in the porous shock absorption layer will reduce shock absorption performance. The results of parameter analysis indicate that the shock absorption performance of the porous shock absorption layer increases with the increase of the void ratio and thickness, and it has good shock absorption performance under different surrounding rock grades and tunnel depths.

关键词： tunnel porous shock absorption layer shock absorption performance reaction acceleration method parameter analysis

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Study on Residents' Intentions to Purchase Prefabricated Housing in China

Study on Residents' Intentions to Purchase Prefabricated Hou...

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2024 International Conference on Construction and Real Estate Management: ESG Development in the Construction Industry, ICCREM 2024

作者： Zhou, Fanxi Zhou, Zhenzong Man, Qingpeng Wang, Yaowu School of Economics and Trade Henan Univ. of Technology Henan China Dept. of Construction Management Harbin Institute of Technology Harbin China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (数字)9780784485910

ISBN: (纸本)9780784485910

Currently, with an increasingly serious environmental population and energy crisis, countries are actively exploring measures to reduce carbon emissions. Environmental protection and sustainable development have become hot points for research. As a high-consumption industry, the construction industry urgently needs to take measures to reduce its negative impacts on the environment. Prefabricated housing has the characteristic of a short construction period and is environmentally friendly. Therefore, it plays a vital role in China's sustainable development. At the same time, the residential industry is a key area for the development of prefabricated buildings. In order to better reveal the consumers' purchase intentions and promote the deeper development of prefabricated housing to bring greater social benefits, this study combines the theory of planned behavior (TPB) and the norm activation model (NAM) to explain the influencing factors of consumers' purchase of prefabricated housing, hoping to scientifically guide residents, and at the same time provide theoretical reference for policy formulation. © ASCE.

关键词： Carbon sequestration

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Wake dynamics of the flow around an anguilliform cylinder at low Reynolds numbers

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Physics of Fluids 2025年第4期37卷

作者： Yang, Yefei Li, Hui Jin, Xiaowei Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Key Lab of Structural Dynamics and Control Ministry of Education Harbin150090 China Shenzhen518055 China

An anguilliform cylinder (AC) is designed with consideration of 3D geometric perturbations inspired by anguilliform swimmers. The flow characteristics around the AC are numerically investigated via three-dimensional (3D) direct numerical simulations at low Reynolds numbers (Re) ranging from 100 to 600. This analysis is compared with analogous investigations concerning flow phenomena around a uniform circular cylinder (CC) and an elliptical cylinder (EC). The effects of the Re on the Strouhal number ( St ) and the force coefficients reveal the 3D wake transition process of different cylinder types, as well as the flow-controlling effects of the anguilliform geometry disturbances. In comparison to the uniform CC and EC, the anguilliform cylinder demonstrates notable achievements in mitigating both the fluctuating lift force and mean drag force. Furthermore, the AC exhibits more elongated separated shear layers when compared with the CC and EC, leading to substantial suppression of coherent vortex shedding across broad spanwise regions. These 3D vortical characteristics directly contribute to the reduction of aerodynamic forces. The values of flowing quantities are influenced by the presence of anguilliform surfaces. Notably, the anguilliform shape of the AC results in higher values of the base pressure coefficient and induces 3D undulatory separations along the cylinder surface. This configuration facilitates prolonged vortex formation lengths and diminishes turbulent kinetic energy in the near wake. These distinct flowing features of AC are linked to its efficacy in suppressing vortex shedding and reducing aerodynamic forces. © 2025 Author(s).

关键词： Kinetic energy

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Building with Snow: Technical Exploration and Practice of Snow Materials and Snow Architecture

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Buildings 2025年第8期15卷 1277-1277页

作者： Sun, Jianfeng Zhang, Qingwen Zhang, Guolong Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Focusing on the design and construction of snow structures, this paper explores the properties of snow materials, construction methods, and operation–maintenance strategies, aiming to demonstrate how to integrate architectural functionality, aesthetics, and structural reliability in snow architecture. It reviews current methods of snow material testing and numerical simulation, yet research on the material properties of machine-made snow remains limited. Current design trends in snow architecture emphasize diverse artistic expressions. After reviewing construction methods of existing snow buildings, the paper employs finite element analysis software to validate design schemes. Upon confirming structural feasibility, it further proposes a monitoring framework for snow structures. © 2025 by the authors.

关键词： Architectural design

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Functionality assessment of natural gas distribution networks in post-earthquake scenarios with widespread component failures

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Reliability engineering and System Safety 2025年 262卷

作者： Wang, Heran Zhai, Changhai Ma, Liyang Song, Dongdong Xie, Lili Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Urban natural gas distribution networks are critical infrastructure systems that provide essential energy services to residential, industrial, and commercial sectors. However, these networks are highly vulnerable to earthquake-induced damage, leading to significant functionality loss and risks such as fires and explosions. To evaluate the functional status of natural gas pipeline networks under post-earthquake conditions, it is essential to develop a robust evaluation model capable of addressing large-scale component damage. This study proposes a natural gas pipeline network functionality assessment methodology that integrates islanding analysis to identify interconnected sub-networks, pressure-dependent demand modeling for user nodes, and a dual-control mechanism for gas source nodes to improve the accuracy of hydraulic calculations under accident conditions. Compared to traditional methods, the proposed approach provides a more accurate representation of natural gas pipeline network behavior under partial gas supply conditions. Validation on a representative natural gas pipeline network demonstrates its effectiveness in identifying and quantifying functional losses during extensive component failures. Comparative analysis reveals that traditional methods tend to overestimate network functionality under severe damage conditions, underscoring the advantages of the proposed approach. These findings confirm the methodology's suitability for evaluating functionality in scenarios of severe disruption. © 2025 Elsevier Ltd

关键词： Natural gas pipelines

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