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A logistic-Lasso-regression-based seismic fragility analysis method for electrical equipment considering structural and seismic parameter uncertainty

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 169-186页

作者： Cui Jiawei Che Ailan Li Sheng Cheng Yongfeng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil EngineeringHarbin Institute of TechnologyHarbin 150094China School of Ocean and Civil Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China China Electric Power Research Institute Beijing 100055China

Damage to electrical equipment in an earthquake can lead to power outage of power *** fragility analysis is a common method to assess the seismic reliability of electrical *** further guarantee the efficiency of analysis,multi-source uncertainties including the structure itself and seismic excitation need to be considered.A method for seismic fragility analysis that reflects structural and seismic parameter uncertainty was developed in this *** proposed method used a random sampling method based on Latin hypercube sampling(LHS)to account for the structure parameter uncertainty and the group structure characteristics of electrical ***,logistic Lasso regression(LLR)was used to find the seismic fragility surface based on double ground motion intensity measures(IM).The seismic fragility based on the finite element model of an±1000 kV main transformer(UHVMT)was analyzed using the proposed *** results show that the seismic fragility function obtained by this method can be used to construct the relationship between the uncertainty parameters and the failure *** seismic fragility surface did not only provide the probabilities of seismic damage states under different IMs,but also had better stability than the fragility ***,the sensitivity analysis of the structural parameters revealed that the elastic module of the bushing and the height of the high-voltage bushing may have a greater influence.

关键词： seismic fragility uncertainty logistic lasso regression ±1000 kV main transformer sensitivity analysis

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Sensitivity analysis and probability modelling of the structural response of a single-layer reticulated dome subjected to an external blast loading

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Defence Technology（防务技术） 2023年第5期23卷 152-163页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China

The structural response of a single-layer reticulated dome to external explosions is shaped by many variables,and the associated uncertainties imply non-deterministic *** deterministic methods for predicting the consequences of specific explosions do not account for these ***,the impact of the uncertainties associated with these input variables on the structures’response needs to be studied and *** this study,a parametric uncertainty analysis was conducted ***,local and global sensitivity analyses were carried out to identify the drivers of the structural dynamic response.A probabilistic structural response model was established based on sensitive variables and a reasonable sample ***,some deterministic empirical methods for explosion-resistance design,including the plane blast load model of CONWEP,the curved blast load model under the 50%assurance level,and the 20%mass-increased method,were used for evaluating their *** results of the analyses revealed that the structural response of a single-layer reticulated dome to an external blast loading is lognormally ***,the MB0.5 method based on the curved reflector load model yielded results with a relatively stable assurance rate and reliability,but CONWEP did not;thus,the 1.2MB0.5 method can be used for making high-confidence simple *** addition,the results indicated that the structural response is very sensitive to the explosion *** on these results,it is suggested that for explosion proofing,setting up a defensive barrier is more effective than structural strengthening.

关键词： Dome structure Blast load uncertainty Sensitivity analysis Probabilistic investigation Reliability evaluation

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External blast flow field evolution and response mechanism of single-layer reticulated dome structure

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Defence Technology（防务技术） 2023年第6期24卷 241-253页

Single-layer reticulated dome structure are commonly high-profile building in the public and can be attractive targets for terrorist bombings,so the public can benefit from enhanced safety with a stronger understanding of the behavior of single-layer reticulated dome structure under *** paper investigates the fluid-structure interaction process and the dynamic response performance of the singlelayer reticulated dome under external blast *** experimental and numerical results shown that structural deformation is remarkably delayed compared with the velocity of blast wave,which advises the dynamic response of large-span reticulated dome structure has a negligible effect on the blast wave propagation under *** failure modes are identified by comparing the plastic development of each ring and the residual spatial geometric of the structure,i.e.,minor vibration,local depression,severe damage,and overall *** plastic deformation energy and the displacement potential energy of the structure are the main consumers of the blast *** addition,the stress performance of the vertex member and the deep plastic ratio of the whole structure can serve as qualitative indicators to distinguish different failure modes.

关键词： External blast loading Reticulated dome structure Fluid-structure interaction dynamic response mode Response mechanism

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STUDY ON THE RESPONSE OF PRESTRESSED REINFORCED CONCRETE SlabS WITH HIGH REINFORCEMENT RATIO UNDER LOW SPEED IMPACT 29

STUDY ON THE RESPONSE OF PRESTRESSED REINFORCED CONCRETE SLA...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Mengyan, Song Di, Jiang Changkai, Li Chaoqi, Zhang Xudong, Zhi China Nuclear Power Engineering Co. Ltd. Beijing China Harbin Institute of Technology Key Lab of Structures Dynamic Behaviour and Control The Ministry of Education Harbin China

ISBN: (纸本)9780791886397

Since the 9.11 incident, the impact of large commercial airliners on nuclear power plants and other important national facilities has attracted worldwide attention. The safety of flying objects hitting nuclear containment has become one of the important research topics in the field of nuclear power generation. In this paper, the impact resistance of non-prestressed and prestressed concrete slabs is studied through detailed experiments and numerical studies. By non-bonding rear sheeting, prestress of about 10MPa is applied to concrete slabs measuring 1400mm×600mm, which are then hit by hemispherical steel hammers (590kg) at heights of 2m and 4m above the center of the span. The impact force, displacement, and the reinforced concrete slab and the prestressed concrete slab are compared. In LS-DYNA finite element software, the CSCM concrete structure model is used to study the numerical values of the experiments carried out. It has been found that with the increase of impact energy, the deformation produced by reinforced concrete slabs increases and is not recoverable. On the other hand, after applying presession, the impact force of prestressed concrete slabs was increased by 53.8% and displacement was reduced by 45% due to the increase of the stiffness of the plate. The maximum reproduction deviation of the impact force and displacement values is 17% and 14%, respectively. The research results will be applied to the structural dynamic impact protection design of nuclear power plant containment. Copyright © 2022 by ASME.

关键词： Reinforced concrete

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Analytical Study of Seismic Demand and Fragility of Piping Systems in the Reticulated Shell structures 26th

Analytical Study of Seismic Demand and Fragility of Piping S...

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26th Australasian Conference on the Mechanics of structures and Materials, ACMSM 2023

作者： Li, Fengze Zhi, Xudong Zhu, Enchun Wang, Duozhi Zhang, Rong School of Civil Engineering Harbin Institute of Technology Harbin China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration Harbin China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency Management Harbin China

ISBN: (纸本)9789819733965

The large-span spatial hub structure is an important urban lifeline project with complex structure form and many types of internal non-structural components. As one of the main non-structural components, the safety of the piping system is important to ensure the normal use of the overall function of the large span hub structure. Once damage occurs to the piping system under the action of earthquake, it will affect the traffic operation and urban rescue, resulting in incalculable casualties and property damage. To assess the impact of diverse connection locations on the piping system’s response, this study investigates acceleration and response amplification factors at various positions within the reticulated shell structure. Through this analysis, we underscore the critical need to consider the spatial coupling effect for the piping system within the reticulated shell structure. In this study, the seismic response and damage modes of the internal piping system in a prevalent type of reticulated shell structures are investigated. This is achieved by establishing a coupled finite element model of the reticulated shell structure and the piping system. Three distinct damage modes of the piping system and their corresponding computational signs are identified, facilitating the creation of fragility curves for the piping system. The results highlight significant variation in the damage degree of the piping system at different locations. Additionally, past studies have shown a notable probability of damage to piping systems, even under very slight ground shaking, emphasizing the necessity for careful consideration. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Shells (structures)

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Failure modes determination and load-bearing capacity evaluation of concrete columns under seismic loads by ANNs

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Soft Computing 2024年第13-14期28卷 8361-8377页

作者： Hao, Meijing Chang, Wei Xu, Chonghao School of Architecture and Civil Engineering Harbin University of Science and Technology Harbin150080 China Key Lab of Structures Dynamic Behavior and Control 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 School of Civil Engineering Harbin Institute of Technology 202 Haihe Road Nangang District Harbin China

The failure modes of concrete columns can be applied to judge the ductility of concrete columns under seismic loads. In addition, the load-bearing capacity of concrete columns was an important parameter in evaluating the seismic performance of concrete columns under seismic loads. However, it was difficult to determine the failure modes and evaluate the load-bearing capacity of concrete columns under seismic loads with the application of high-strength concrete. In this paper, two ANNs, including a genetic algorithm optimization-based support vector machine (GA-SVM) and an ANFIS, were developed to determine the failure modes of concrete columns under seismic loads. The main investigated parameters, including specimens' shear span ratio, the compressive strength of concrete, the yield strength and volumetric ratio of stirrups, and the yield strength and ratio of longitudinal reinforcement, were applied as input variables to the models. The proposed models were trained and tested using 247 data sets from previous studies. The proposed models had high reliability and predictability to determine the failure modes of concrete columns under seismic loads. Furthermore, an ANFIS network was developed to evaluate the load-bearing capacity of concrete columns, which had high reliability and predictability. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Failure modes

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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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Effect of trigger system on experimental dispersion characteristics of active surface wave testing

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 311-318页

作者： Lin Shibin Jeramy C.Ashlock Zhu Liming Qin Zexiang Li Bo Zhu Xingji Zhai Changhai State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Department of Civil Construction&Environmental EngineeringIowa State UniversityAmesIA 50010USA Wuhan Airport Road Development Co. Ltd.Wuhan 430065China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China 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 Disaster of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data *** effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible,however,theoretical explanation regarding the effect of the trigger system is *** study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical ***,based on the new theoretical explanation,an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is *** active surface wave testing cases are considered to validate the theory and *** results indicate that(1)an accurate trigger system is not necessary for surface wave data acquisition,and(2)it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.

关键词： site investigation surface waves data acquisition dispersion

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Mechanical properties of concrete at low and ultra-low temperatures- a review

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Journal of Infrastructure Preservation and Resilience 2022年第1期3卷 20页

作者： Huo, Yanlin Sun, Huayang Lu, Dong Chen, Zhitao Yang, Yingzi School of Civil Engineering Harbin Institute of Technology Harbin150090 China 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

As infrastructure construction advances toward the cold and highland environment, concrete preparation technology and service performance in the cold climate is receiving much attention. The freezing of pore water inside concrete leads to significant changes in its mechanical properties at negative temperatures. Therefore, to ensure the safety of civil engineering structures in cold regions, it is necessary to fully understand the change law and enhancement mechanism of the mechanical properties of concrete and be able to predict mechanical properties at a negative temperature. Since the 1970s, scholars have studied concrete’s negative temperature mechanical properties in different water-content states. This paper presents a comprehensive review of the changes in mechanical properties of concrete at low and ultra-low temperatures and further elucidates the evolution of its compressive strength, tensile strength, flexural strength, elastic modulus, and stress-strain relationship at low temperatures. It was found that the main factors affecting the mechanical properties of concrete at low temperatures were temperature and moisture content. The strength of concrete increases significantly with the decrease in temperature and the increase in moisture content. To better understand and predict the mechanical properties of concrete at low temperatures, the best model was suggested by analyzing the prediction models of different researchers and considering the dispersion of the data. Further, based on the G. Wiedemann pore model, the changes in the internal structure of concrete at low temperatures are described in detail, and the mechanism of its mechanical property enhancement is analyzed. © The Author(s) 2022.

关键词： Compressive strength

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External blast load factors for dome structures based on reliability

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Defence Technology（防务技术） 2022年第2期18卷 170-182页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan Richard GJFlay State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Department of Mechanical Engineering University of AucklandPrivate Bag 92019Auckland1142New Zealand

Dome structures have been used extensively for industrial,residential,and military ***,it is necessary to understand the damage risk potential for such structures for blast-resistant design *** paper investigates the effect of blast load variability on the design value and the structural dynamic ***,the sources of uncertainty in the external blast load on dome structures were discussed *** based on the probabilistic blast load model for the dome,the rationality of a deterministic mass-increase safety method was *** was found that previous deterministic design method cannot provide a consistent and sound assurance factor or reliability index on the entire dome *** addition,it was also proved that the assurance-based load method fails to ensure compliance with structural safety design standards on the dome roof when compared with the reliability-based blast method.A sensitivity analysis on the probabilistic blast load was conducted,and the results indicate that stand-off distance and explosive mass both act as dominant sources to influence the mean and variability of blast ***,based on the Latin hypercube sampling method,a reliability-based external blast load factor technique was *** technique was further used to estimate structural damage levels of a single-layer reticulated dome under different reliability requirements,associated with a low,medium,and high level of protection grades for a specific explosion scenario,and it indicated that this technique can be useful in the building design to achieve a higher structural anti-explosion *** study herein can serve as a reference for the calculation method of designed blast load.

关键词： Dome structure Airblast variability Deterministic design Assurance factor Reliability-based blast load factor Structural damage levels

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