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Research Square 2021年

作者： Chang, Wei Zheng, Wenzhong 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 The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The compressive strength of concrete confined with spiral stirrups was an important parameter to evaluate the load-bearing capacity of concrete columns. The confinement provided by spiral stirrups let concrete under the triaxial compression state and improved the compressive strength of concrete. However, the relationships between concrete and stirrups were complex and the existing prediction models for evaluating the compressive strength of confined concrete were various. In this paper, an adaptive neural-fazzy inferenxe system (ANFIS) model was developed to evaluate the compressive strength of concrete confined with stirrups. A set of 231 experimental results of concrete confined with spiral stirrups were collected from the previous studies to establish a reliable database. The investigated parameters included the aspect ratio of specimens, the diameter, spacing, yield strength, and volumetric ratio of stirrups, the ratio of longitudinal reinforcement, and the compressive strength of concrete. The results showed that the ANFIS model predicted the compressive strength of confined concrete accurately. By comparing with existing models, the proposed ANFIS model had high applicable and reliability. The effects of the investigated parameters on the compressive strength of concrete were analyzed based on the proposed ANFIS model. © 2021, CC BY.

关键词： Compressive strength

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Passive Perforated Pipe control Method for Wind?Induced Vibration of a High?Rise Chemical Tower

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第1期37卷 99-107页

作者： LU Shanshan ZHANG Zhifu ZHANG Runtao CHEN Wenli Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090P.R.China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090P.R.China

Vortex-induced vibration is likely to occur when subjected to wind loads because of low horizontal stiffness,resulting in internal force and large lateral ***-term wind-induced vibration can not only affect the normal service and durability performance of chemical towers,but also seriously endanger the safety of towers in service periods,and cause property *** this study,a passive control method for suppressing wind-induced vibration of chemical towers is *** flow around the flow field is guided by a pre-set air-blowing channel,thus destroying the unsteady vortex shedding in the wake region of the flow field and achieving the purpose of flow *** accelerometers are used to measure the vibration signal of the chemical tower model with and without the perforated *** control effects of the spacing and the installation position of the perforated pipe are then *** results show that the passive perforated pipe control method can effectively reduce the vibration amplitude of the chemical tower under wind loads,and decrease the potential wind-induced vibration.

关键词： chemical tower wind-induced vibration pneumatic control

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Investigation on the reinforcement effect of a bedding slope affected by a landsliding block

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Arabian Journal of Geosciences 2022年第6期15卷 1-20页

作者： Zhang, Fei Yang, Tianhong Li, Lianchong Zhu, Xinping Key Laboratory of Roads and Railway Engineering Safety Control Shijiazhuang Tiedao University Ministry of Education Shijiazhuang China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang China Center of Rock Instability and Seismicity Research School of Resources and Civil Engineering Northeastern University Shenyang Liaoning China China Coal Technology and Engineering Group Shenyang Research Institute Fushun China

The south slope of Fushun west open-pit mine located in Northeast China is a high-deep rock slope. In the last few years, a landsliding block has gradually formed in the south slope. Owing to the effect of sliding force caused by the sliding block, some damage has occurred on the foundation of Kengkou refinery which constructed in the west of the south slope. To improve the stability of the refinery foundation, three group micro-pile structures were employed to cut off the drag of the sliding block and reinforce the refinery on the southwest slope. In this study, a comprehensive method combining the microseismic monitoring technique and numerical simulation method was used, the stability of the southwest slope was evaluated, and reinforcement mechanism was deeply analyzed. A microseismic monitoring system is established on-site to obtain useful information about the damage energy, location, and magnitude of the rocks in the southwest slope. Thus, the west boundary of the landslide in the south slope of the open-pit is determined. By analyzing the numerical results, the stress concentration is discovered mainly around the micro-pile structures and near the west boundary. After reinforcement, the displacement decrease in the south-north direction is apparent. To investigate the interaction mechanism between the micro-pile and the surrounding rock mass, a local 3D numerical model is employed to help understand auxiliary information about the stress state and stress redistribution induced by failure in the surrounding rock mass. It is shown that the reinforcement effect becomes more and more evident with the increase in the number of employed micro-piles. The numerical results and in situ GPS displacement monitoring data illustrate that the micro-pile structures have an excellent strengthening result in controlling the deformation of the slope. The comprehensive methodology provides an effective way to estimate the stability and the reinforcement effect of the slope und

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Ground motion inversion utilizing sensor-based structural response time histories with a multi-head attention-enhanced temporal convolutional network

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Engineering Applications of Artificial Intelligence 2025年 156卷

作者： Ali Zar Shuang Li Changqing Li Yicheng Chen Muhammad Akbar Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China College of Civil Engineering and Architecture Jiangsu University of Science and Technology Zhenjiang Jiangsu China

Accurate measurement of ground motion (GM) time histories is essential for precise structural analysis and safety evaluation. However, high costs, limited availability, and maintenance demands of GM recording devices lead to several challenges. This paper aims to present the Multi-Head Attention-Enhanced Temporal Convolutional Network (MHA-TCN Net), a framework developed for inverting GM from recorded structural response (SR) data during earthquakes. A case study on complex multi-degree-of-freedom (MDOF) structures demonstrates the MHA-TCN Net's ability to predict GM time histories across elastic and various plastic deformation ranges, showcasing its potential for real-time GM inversion. By incorporating a multi-head attention mechanism along with an overlapping subset strategy, the MHA-TCN Net achieves high precision in GM inversion. It consistently demonstrates low validation losses, with the mean absolute error not exceeding 0.063, exhibits test correlation coefficients as high as 0.95, and maintains a mean square error below 0.4 on unseen test datasets. Comparative experiments against the Temporal Convolutional Network, Long Short-Term Memory, Convolutional Neural Network, Gated Recurrent Unit, and Transformer models demonstrate the MHA-TCN Net's faster convergence and superior accuracy for both training and validation phases. Importantly, the proposed approach can handle inherent sensor noise, ensuring reliable performance under challenging field conditions, thereby highlighting the contribution of advanced artificial intelligence methods for engineering applications with constrained data environments. Furthermore, without retuning the network, the model demonstrates high accuracy with limited real-time training datasets, proving its versatility across various real-world datasets, especially in areas with SR sensors but few seismic instrumentations.

关键词： Convolutional neural networks

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Structural Performance of Smart CFRP-FBG Reinforced Steel Beams

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Journal of Architectural Environment & Structural Engineering Research 2020年第4期3卷 9-15页

作者： Huaping Wang Tao Song Hengyang Li Siyuan Feng School of Civil Engineering and Mechanics Lanzhou UniversityLanzhouGansu730000China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHarbinHeilongjiang150090China

Many beam structures suffer from gradual performance degradation with the increase of service *** recover the bearing capacity of these beams,carbon fiber reinforced polymer(CFRP)plates are developed to attached on the beam *** check the structural performance of the CFRP reinforced beams,smart CFRP plate with FBGs in series is designed and LVDTs are adopted to measure the *** deflection of the reinforced beam is given based on the elastic conversion cross-section *** experimental results validate the effectiveness of the proposed *** study shows that the CFRP reinforced zone has a larger flexural rigidity than the pure steel beam *** general distribution of the deflection along the span of the CFRP reinforced beam can be described by the proposed *** provides a scientific design guidance for the deflection control of CFRP reinforced structures.

关键词： CFRP reinforced beam Interfacial interaction Smart CFRP-FBG plate Deflection Experimental investigation

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Design and service performance of FRP anchorage system: A review

Review of Materials Research

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Review of Materials Research 2025年第2期1卷

作者： Yanzhao Niu Guijun Xian Rui Guo Key Lab of Structures Dynamic Behavior and Control (Ministry of Education) Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin 150090 China

Fiber Reinforced Polymer (FRP) materials, with their excellent properties such as lightweight, high strength, and corrosion resistance, have become highly promising materials in modern engineering. However, to fully harness the advantages of FRP, a reliable anchorage system is crucial. This paper provides a comprehensive review of the research on FRP anchorage systems, focusing on static tensile, fatigue and durability properties, exploring the working mechanisms, failure modes and performance influencing factors of anchorage systems. The static tensile properties of anchorages are closely related to the type of anchorages, with mechanical, bonded, composite and self-anchored types anchorage systems each having their own strengths and weaknesses. Regarding fatigue performance, mechanical-type anchorages are prone to interfacial wear and slippage, while bonded and composite types anchorages exhibit shear and slippage failures, and self-anchored systems tend to suffer from localized fracture due to stress concentration. Design optimization and material improvements can help mitigate fatigue damage. Moreover, both FRP and the bonding medium are susceptible to performance degradation or electrochemical corrosion under complex environmental conditions. The bonding performance at the interfaces of anchorage components deteriorates under the combined effects of load and environmental factors, posing a significant threat to the long-term performance of FRP anchorage systems. This study provides valuable insights into the performance of FRP anchorage systems in engineering applications, driving their technical advancement and practical implementation.

关键词： FRP Anchorage system Fatigue properties Durability Damage mechanism

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Study on tension - tension fatigue life and failure mechanism of carbon fiber reinforced polymer bar under high stress levels

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Construction and Building Materials 2025年 487卷

作者： Yanzhao Niu Chenggao Li Jingwei Tian Rui Guo Guijun Xian Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Heilongjiang Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin 150090 China

Fatigue loading is one of the critical factors leading to the degradation of properties in carbon fiber reinforced polymer (CFRP) bars. To ensure the safety of CFRP bars reinforced structures during long-term service, it is imperative to conduct research on their fatigue performance. Compared to previous studies on FRP fatigue performance, this study investigates the effects of stress level, stress ratio and loading frequency on the fatigue behavior of CFRP bars under high stress levels through experimental testing with key evaluation parameters including fatigue life, stiffness degradation and residual tensile strength and elastic modulus. The fatigue design method for CFRP bars in engineering structures is established using probabilistic Weibull distribution tools. The research findings indicate that CFRP bars exhibit sudden brittle fracture at 80 % stress level, similar to static tension, where fatigue damage is primarily characterized by fiber breakage. Fatigue failure at stress levels between approximately 60 % and 75 % follows a progressive process, which includes three stages: matrix cracking, interface debonding, and fiber fracture. Fatigue damage increases with the decrease in the stress ratio, resulting in a gradual reduction in fatigue life. S-N fatigue life curves of CFRP bar show that the fatigue limits increases with increase of stress ratio, and the residual tensile strength and elastic modulus decrease with the increase of stress level and fatigue cycle. The fatigue design method is established based on probabilistic tools of Weibull distribution, which provides the design parameters with 95 % confidence of CFRP bar for engineering structures.

关键词： CFRP bars Failure mechanism Fatigue test Residual mechanical strength Stiffness

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Interfacial shear behavior in steel-concrete-steel composite structures with stud connectors after freeze-thaw cycles

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Construction and Building Materials 2025年 484卷

作者： Wei, Xudan Yan, Jiachuan Lin, Youzhu 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 School of Civil and Transportation Engineering Northeast Forestry University Harbin150040 China

Steel-concrete-steel (SCS) composite structures have potential applications in the northern cold region. To investigate the interfacial shear performance and failure mechanism of SCS composite structures with stud connectors subjected to freeze-thaw cycles (FTCs), freeze-thaw tests and push-out tests were conducted on 36 specimens to investigate the effects of concrete type, stud quantity, and FTCs. The test results showed that when the core concrete was changed from C30 concrete to ultra-high-performance concrete (UHPC), the shear capacity, shear stiffness, and ductility of the specimens all increased significantly, by approximately two times. Moreover, the failure mode of the specimens shifted remarkably from concrete splitting damage to stud breakage failure. Increasing the stud quantity or FTCs reduced the shear capacity and stiffness of the specimen, yet it exerted a minimal impact on the ductility. In addition, precise finite element models were established to investigate the effect of the relative strength between studs and concrete and the stud spacing on the failure modes and interfacial shear capacity. Based on experimental and finite element data analysis, a formula for calculating the interfacial shear capacity of SCS composite structures after FTCs was proposed. The calculation results were consistent with the test and simulation results, and this formula can serve as a reference for the design and application of SCS composite structures in cold regions. © 2025

关键词： Ultra-high performance concrete

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Interfacial Interaction of CFRP Reinforced Steel Beam structures

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Journal of Architectural Environment & Structural Engineering Research 2020年第4期3卷 2-8页

作者： Huaping Wang Hengyang Li Siyuan Feng Tao Song School of Civil Engineering and Mechanics Lanzhou UniversityLanzhouGansu730000China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHarbinHeilongjiang150090China

Due to the increase of service life,the phenomenon of performance degradation of bridge structures becomes more and more *** is important to strengthen the bridge structures so as to restore the resistance level and extend the normal service *** fiber reinforced polymer(CFRP)materials are thus used for the assembly reinforcement of bridges for the advantages of high strength,light weight,corrosion resistance and long-term stability of physical and chemical properties,*** view of this,based on the previous theoretical study and the established formula of the interfacial shear stress of CFRP reinforced steel beam and the normal stress of CFRP plate,this paper discusses the sensitive parameters that affect the interfacial interaction of CFRP strengthened beam *** the analysis,the priority design indicators and suggestions are accordingly given for the design of reinforced beam ***’s modulus of CFRP composite and shear modulus of the adhesive have the greatest influence on the interfacial interaction,which should be carefully *** is suggested that CFRP material with Ec close to 300 GPa and thickness no less than 3 mm,and adhesive material with Ga less than 5 GPa and 3-mm thickness can be adopted in CFRP reinforced steel *** conclusions of this paper can provide guidance for the interfacial damage control of CFRP reinforced steel beam structures.

关键词： CFRP reinforced steel beam Interfacial interaction Shear stress Parametric analysis Design instruction

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Magnetic exchange interaction between unpaired π-and d-electrons in nanographene-metal coordination complexes

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National Science Review 2025年第4期 260-267页

作者： Deng-Yuan Li Yuqiang Zheng Ricardo Ortiz Bing-Xin Wang Yashi Jiang Bingkai Yuan Xin-Yu Zhang Can Li Liang Liu Xiaoxue Liu Dandan Guan Yaoyi Li Hao Zheng Canhua Liu Jinfeng Jia Thomas Frederiksen Pei-Nian Liu Shiyong Wang Key Laboratory of Natural Medicines Department of Medicinal ChemistryChina Pharmaceutical University Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) TD Lee Institute Shenyang National Laboratory for Materials ScienceSchool of Physics and Astronomy Shanghai Jiao Tong University Donostia International Physics Center (DIPC) Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistryState Key Laboratory of Chemical Engineering School of Chemistry and Molecular Engineering East China University of Science & Technology Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences (CAS) Hefei National Laboratory Ikerbasque Basque Foundation for Science

The combination of open-shell nanographenes(NGs) and magnetic transition metals holds great promise for generating various new quantum phases applicable in spintronics and quantum information ***,a crucial aspect in accomplishing this is to comprehend the magnetic exchange interactions between unpaired π-and d-electrons,a topic that has been seldom *** this study,we focus on magnetic π-d exchange interactions between open-shell NGs and a magnetic coordination center of Fe or Co by employing scanning tunneling microscopy and *** synthesize two sets of NG-metal coordination complexes on a Au(111) substrate,secured by coordination bonds of carboxyl acid-Fe(Co).Through analysis of the excitation spectra,we observe a characteristic exchange coupling of 9 meV(5 meV) between the unpaired π-electron and the Fe(Co) d-shell *** experimental findings are qualitatively in agreement with multiconfigurational quantum chemistry *** work provides evidence that a substantial magnetic exchange coupling can be achieved and engineered in metal-organic coordination systems,paving the way for designing and customizing extended radical metal-organic frameworks with precisely tailored magnetic properties.

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