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Numerical analysis and design on the embedded column base for circular CFST under seismic loads

Engineering structures 2025年 340卷

作者： Shasha Tan Lanhui Guo Ou Zhao Chen Jia 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 School of Civil and Environmental Engineering Nanyang Technological University Singapore

The type and configuration of column base significantly affects the seismic behavior and design of concrete-filled steel tube (CFST) structures. This paper presents a numerical investigation into the seismic performance of embedded column bases for CFST structures. Finite element (FE) models for seismic analyses of embedded column bases were developed, with the modeling techniques and parameters detailed, and validated against available test results. On the basis of the obtained numerical results, the working mechanisms of embedded column bases under seismic loads, including failure modes, load transfer mechanisms, and interaction stress distributions among different components, were discussed in detail. Parametric studies were subsequently conducted to investigate the influence of a series of identified key parameters. The results revealed that the embedded depth ratio, steel ratio, and cross-section diameter of CFST significantly affected the failure mode, ultimate strength, and energy dissipation capacity of embedded column bases, whereas the endplate dimensions and shear studs influenced only the energy dissipation capacity. Additionally, the anchor bolt ratio and foundation concrete strength showed minimal effects for the investigated parameter ranges. Finally, calculation methods for the ultimate strengths of both deeply and shallowly embedded column bases were established, and the seismic design method and process for embedded column bases were also proposed and validated.

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Compressive Strength Evaluation of Concrete Confined With Spiral Stirrups by Using Adaptive Neuro-fuzzy Inference System (ANFIS)

Research Square

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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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An engineering-oriented multi-fidelity surrogate modeling approach using multisource data aggregation in data-scarce environments

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Journal of Building Engineering 2025年 108卷

作者： Wang, Zhaoyong Cao, Zhengfeng Mulyanto, Joshua Adriel Wu, Yue Zheng, Chaorong School of Civil Engineering Harbin Institute of Technology Harbin150090 China China Construction Machinery Co. LTD Hebei Langfang065000 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

The multi-fidelity surrogate (MFS) model has become an emerging hotspot in engineering prediction and optimization. However, this model typically relies on abundant low-fidelity data (LF data) and a limited amount of high-fidelity data (HF data). In practical engineering, data-scarce environments make it difficult to obtain sufficient LF data, leading to a significant decline in MFS model performance. To address this issue, we propose a multi-fidelity surrogate model based on multi-source data aggregation (MDA-MFS), which effectively balances predictive accuracy and modeling cost. Firstly, we utilize a combination of LF data and HF data to construct a data augmentation strategy, generating medium-fidelity data (CF data), which increases the data diversity and fidelity categories without increasing the sample size. Secondly, we build the MDA-MFS model that integrates LF, CF, and HF data, achieving a balance between modeling efficiency and cost through innovative MFS modeling strategies. We validate the practicality of the MDA-MFS model in the engineering application of wind pressure prediction. Finally, through testing on high-dimensional functions (dimensions of 10, 30, and 100), we demonstrate that the MDA-MFS model has good generalizability and scalability. Our findings are encouraging in that the MDA-MFS model demonstrates excellent prediction accuracy and robust generalization performance. Compared with the MFS model, the MDA-MFS model significantly reduces modeling costs while markedly improving modeling efficiency. More importantly, in light of the growing desire for efficient solutions to prediction or optimization problems in data-scarce environments, our results hold broader significance. © 2025 Elsevier Ltd

关键词： Work simplification

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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.

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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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Buckling behaviour of S700 high strength cold-formed steel built-up I-section columns

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Journal of Constructional Steel Research 2025年 233卷

作者： Zhuo Wang Chicheng Ma Hua Yang Andi Su 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 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Nanning Guangxi 530004 China

High strength cold-formed steel (CFS) built-up sections have been widely used in the construction sector, mainly due to high load-bearing capacities and flexible cross-section shapes. To further broaden the knowledge and develop efficient design provisions for high strength CFS built-up sections, experiments and numerical simulations were conducted to investigate the local–flexural interactive buckling behaviour and resistances of S700 high strength CFS built-up I-section columns. In the physical experiments, two identical unlipped channel sections were adopted to assemble each built-up I-section in a back-touching configuration with self-tapping screws. Material testing and measurements of initial geometric imperfections were first conducted; nine column specimens of two cross-sections – 90 × 70 × 2.9 and 160 × 100 × 2.9 were employed and then tested under pin-ended boundary conditions. In the numerical simulations, finite element (FE) models were developed and observed to precisely capture experimental observations. A parametric study was then conducted to derive additional numerical data across a wider range of geometric parameters and member slenderness. After that, the effective width method (EWM) in the European code and American specification, and the direct strength method (DSM) in the American specification were assessed, according to the experimental and numerical results, for their applicability to S700 high strength CFS built-up I-section columns failing by minor-axis local–flexural interactive buckling. The assessment results showed that the EWM yielded scattered and conservative results, while the DSM resulted in relatively accurate but still overall conservative resistance predictions. Therefore, a revised AISI design approach was proposed to improve design consistency and accuracy, with its reliability also verified.

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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.

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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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Progressive collapse mechanism of three-dimensional self-centering precast concrete frame with infill walls and slabs

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Engineering Failure Analysis 2025年

作者： Haoran Wang Shuang Li Feng Lin School of Civil Engineering Shenyang Jianzhu University Shenyang 110168 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 Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Department of Structural Engineering Tongji University Shanghai 200092 China Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education Shanghai 200092 China

In this study, the effects of infill walls and slabs on the progressive collapse resistance of three-dimension (3D) self-centering precast concrete (PC) frame under corner column failure, middle column failure and internal column failure scenarios were numerically investigated. Based on the verified numerical modeling methods, the failure modes and collapse mechanism of twelve 3D self-centering PC frames were analyzed. The results indicated that the number of spans connected to the failure column will directly influence the progressive collapse resisting-capacity of 3D self-centering PC frames. Compared with slabs, infill walls improved the progressive collapse resistance of 3D self-centering PC frame more obviously. For failure span with small aspect ratio, the presence of infill walls and slabs did not alter the failure mode of the structure. With the aspect ratio of the failure span increased, for 3D self-centering infilled PC frame, the stronger constraint of surrounding frame enhanced the overall stiffness of the infill walls, resulting in a change in the failure mode of the frame. When the slab was arranged, since the larger stiffness of the slabs improved the shear capacity of the beam section, the main concrete damage were still concentrated at the beam ends. A simplified calculation method considering the resistance contribution of structural and non-structural members was proposed to predict the vertical resistance of 3D self-centering PC frame structures under different failure column scenarios in the compressive arch action (CAA) stage.

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