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

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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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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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 availab.lity, 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.

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Design and service performance of FRP anchorage system: A review

Review of Materials Research

引用

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.

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Essential Stressing State Features of Laterally Loaded Masonry Wall Panels Revealed from Experimental Displacements

Research Square

引用

Research Square 2021年

作者： Liu, Bai Li, Rui Zhang, Yu Zhou, Guangchun Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology School of Civil Engineering Harbin Institute of Technology Harbin150090 China Urban and Engineering Disaster Prevention Laboratory Institute of Engineering Mechanics China Earthquake Administration Harbin150086 China

This study reveals the essential and general working features of laterally loaded masonry (LLM) wall panels from their experimental displacements by applying structural stressing state theory. Firstly, the generalized work of force is proposed to express the stressing state mode and its characteristic parameter. Then, the Mann-Kendall criterion is applied to detect the mutation point in the curve of the characteristic parameter with the load increase. Correspondingly, it is verified that the evolution of the stressing state mode also embodies the mutation feature. The stressing state mutation feature is inherent and common as the embodiment of the natural law from quantitative change to qualitative change of a system. The stressing state mutation feature reveals the starting point of structural failure process, which could update the existing definition of structural failure load. Further, the elastoplastic branch (EPB) point is revealed referring to the updated failure load, which might be directly taken as the design load with the rational margin of safety. In a sense, this paper presents a new way to address the classic issue of structural load-bearing capacity uncertainty and to update the existing design codes of LLM wall panels. © 2021, CC BY.

关键词： Fracture mechanics

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Experimental investigation of shear behavior in precast concrete beams with steel bolted splice connections

引用

structures 2025年 78卷

作者： Khalil Abualtayef Wei Zhou School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education School of Civil Engineering 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 School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

Precast concrete structures with bolted connections offer significant advantages, including shorter construction times, improved quality control, and enhanced structural performance. This study investigates the shear behavior of precast concrete beams with steel-bolted splice connections (PCBSBs), which join the discontinuity of two short concrete beam segments, under monotonic loading. Afterwards, the shear performance of PCBSB beams was experimentally and analytically investigated. Six full-scale PCBSB specimens and one control concrete beam were tested to evaluate the effects of key parameters include the shear span ratio and steel plate thickness. The test results show that the failure modes of PCBSB beams are similar to those of reinforcement concrete beams, and the crack propagations can be well controlled by the steel plate thickness. Using a steel bolted connection with a thickness of 3 mm and 5 mm increased the shear crack load by 9 % and 24 %, respectively. After the loading reached 65 % of the peak load, the deflection of steel bolted connection begins to increase more than the shear load deflection till peak load. For beams with long shear span ratio, increase of steel plate thickness led to increase the stiffness, and peak load. Higher a/d ratios increase deflection and shift failure modes from ductile (shear-compression) to brittle (shear-tension). Finally, the experimental shear capacities of the PCBSBs exceeded the predictions of the GB, ACI, EN, and CSA standards for beams with a/d ratios of 1.5 and 2.0. However, discrepancies were observed for beams with a/d of 3.0, where flexural behavior becomes more dominant. Based on these findings, a preliminary design recommendation was proposed. Further studies were recommended to investigate the performance of beams with shorter a/d ratios and varying dimensions to optimize connection efficiency.

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Big-data driven building retrofitting: An integrated support vector machines and fuzzy c-means clustering method

Big-data driven building retrofitting: An integrated support...

引用

World Sustainable Built Environment - Beyond 2020, WSBE 2020

作者： Lu, Weizhuo Feng, Kailun Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Sweden Department of Construction Management Harbin Institute of Technology Harbin150009 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 Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

It has become a mainstream to use physical models to quantify expected energy savings from alternative retrofit methods and technologies. However, they are not suitable for predicting energy use of buildings when detailed and specified input parameters are unavailab.e. The overall purpose of the research is to support the stakeholders in taking decisions on refurbishments options when not all of physical information is availab.e, in order to achieve the Swedish Energy Agency's measurements of near-zero energy buildings. The research will transfer big data from Swedish Energy Performance Certificates for building retrofitting. A Support Vector Machines and Fuzzy C-means clustering (SVM-FCM) integrated machine learning algorithm is used directly to extract the case-specific knowledge from EPC big data regarding building characteristics and energy saving of retrofit measures. It enables to prioritize retrofit measures and compute their expected energy savings for buildings. This proposed data driven method is an attempt of taking advantage of big data for practical building retrofit selection. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Support vector machines

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A new numerical scheme for simulating non-gaussian and non-stationary stochastic processes

arXiv

引用

arXiv 2020年

作者： Zheng, Zhibao Dai, Hongzhe Wang, Yuyin Wang, Wei Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

This paper presents a new numerical scheme for simulating stochastic processes specified by their marginal distribution functions and covariance functions. Stochastic samples are firstly generated to automatically satisfy target marginal distribution functions. An iterative algorithm is proposed to match the simulated covariance function of stochastic samples to the target covariance function, and only a few times iterations can converge to a required accuracy. Several explicit representations, based on Karhunen-Loève expansion and Polynomial Chaos expansion, are further developed to represent the obtained stochastic samples in series forms. Proposed methods can be applied to non-gaussian and non-stationary stochastic processes, and three examples illustrate their accuracies and efficiencies. Copyright © 2020, The Authors. All rights reserved.

关键词： Stochastic systems

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A sample-based stochastic finite element method for structural reliability analysis

arXiv

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arXiv 2020年

This paper presents a new methodology for structural reliability analysis via stochastic finite element method (SFEM). A novel sample-based SFEM is firstly used to compute structural stochastic responses of all spatial points at the same time, which decouples the stochastic response into a combination of a series of deterministic responses with random variable coefficients, and solves corresponding stochastic finite element equation through an iterative algorithm. Based on the stochastic response obtained by the SFEM, the limit state function described by the stochastic response and the multidimensional integral encountered in reliability analysis can be computed without any difficulties, and failure probabilities of all spatial points are calculated once time. The proposed method can be applied to high-dimensional stochastic problems, and one of the most challenging issues encountered in high-dimensional reliability analysis, known as Curse of Dimensionality, can be circumvented without expensive computational costs. Three practical ex- Copyright © 2020, The Authors. All rights reserved.

关键词： Reliability analysis

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