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Experimental studies on behavior of fully grouted reinforced-concrete masonry shear walls

Earthquake Engineering and Engineering Vibration 2015年第4期14卷 743-757页

作者： Zhao Yan Wang Fenglai Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

An experimental study is conducted on fully grouted reinforced masonry shear walls (RMSWs) made from concrete blocks with a new configuration. Ten RMSWs are tested under reversed cyclic lateral load to investigate the influence of different reinforcements and applied axial stress values on their seismic behavior. The results show that flexural strength increases with the applied axial stress, and shear strength dominated by diagonal cracking increases with both the amount of horizontal reinforcement and applied axial stress. Yield displacement, ductility, and energy dissipation capability can be improved substantially by increasing the amount of horizontal reinforcement. The critical parameters for the walls are derived from the experiment: displacement ductility values corresponding to 15% strength degradation of the walls reach up to 2.6 and 4.5 in the shear and flexure failure modes, respectively; stiffness values of flexure- and shear-dominated walls rapidly degrade to 17%–19% and 48%–57% of initial stiffness at 0.50 D_max (displacement at peak load). The experiment suggests that RMSWs could be assigned a higher damping ratio (～14%) for collapse prevention design and a lower damping value (～7%) for a fully operational limit state or serviceability limit state.

关键词： reinforced-concrete masonry shear wall shear strength ductility stiffness degradation energy dissipation equivalent viscous damping ratio

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Transformer-based large vision model for universal structural damage segmentation

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Automation in Construction 2025年 176卷

作者： Xu, Yang Zhang, Chuao Li, Hui 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 Key Lab of Structures Dynamics Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

Current structural damage segmentation models are often trained based on substantial pixel-level labels for specific structural components and damage types. To address this issue, this paper establishes a transformer-based large vision model for universal structural damage segmentation, incorporating a pre-trained transformer-based frozen backbone and a fine-tuned CNN-based segmentation head. A synthetic loss function of correlation loss and contrastive loss is proposed. A self-supervised correlation learning procedure is designed to ensure cross-level feature alignment. The contrastive loss across student-teacher networks is designed to learn intra-instance similarity and inter-instance separability. A contrastive learning strategy is employed to fine-tune the segmentation head by exponential moving average with momentum updating. The proposed method is validated on a multi-scale image dataset for cable-supported bridges, concrete bridges, and post-earthquake buildings. The recognition accuracy, generalization ability, robustness under complex background, and superiority to conventional supervised and unsupervised segmentation models are demonstrated. © 2025 Elsevier B.V.

关键词： Image segmentation

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High strength concrete-filled cold-formed high strength steel built-up box-section stub columns: Testing, numerical modeling and design

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Thin-Walled structures 2025年 214卷

作者： Zhang, Jiahao Yang, Hua Jiang, Ke Su, Andi Key Lab of Structures Dynamic Behaviour 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 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Nanning530004 China Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand

This paper reports testing and numerical modeling program on high strength concrete-filled S700 cold-formed high strength steel (HCFHSS) built-up box-section stub columns to investigate their cross-sectional behavior and resistance. Twelve stub column tests were performed on HCFHSS built-up box-sections designed with three grades of high strength concretes, i.e. C60, C90 and C120. The ultimate loads, axial load–end shortening curves and failure modes of all test specimens were reported. The numerical program was then performed, in which stub column finite element models were developed and validated against the experimental observations, accounting for the confinement effect. Parametric studies incorporating 160 finite models were carried out for generating further numerical data. The test and numerical results were used to evaluate the applicability of the existing European Code (EC4), American Specification (AISC) and Chinese standard (GB) to HCFHSS built-up box-sections. The EC4 yielded overly conservative yet consistent predictions with a mean overprediction of 32 %, while the AISC design provisions were generally conservative by 26 % on average and exhibited notable inaccuracy, particularly for slender sections. In contrast, the GB design provisions provided the most accurate but unsafe predictions. To address the shortcomings, modified design provisions were thus proposed for HCFHSS built-up box-section stub columns and shown to yield improved design accuracy and consistency. © 2025 Elsevier Ltd

关键词： Ultra-high performance concrete

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Resilience assessment and optimization method of city road network in the post-earthquake emergency period

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 765-779页

作者： Wang Haoran Xiao Jia Li Shuang Zhai Changhai 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 TechnologyHarbin Institute of TechnologyHarbin 150090China

The post-earthquake emergency period,which is a sensitive time segment just after an event,mainly focuses on saving life and restoring social *** improve the seismic resilience of city road networks,a resilience evaluation method used in the post-earthquake emergency period is *** road seismic damage index of a city road network can consider the influence of roads,bridges and buildings along the roads,*** road capacity after an earthquake.A function index for a city road network is developed,which reflects the connectivity,redundancy,traffic demand and traffic function of the *** optimization model for improving the road repair order in the post-earthquake emergency period is also developed according to the resilience evaluation,to enable decision support for city emergency management and achieve the best seismic resilience of the city road *** optimization model is applied to a city road network and the results illustrate the feasibility of the resilience evaluation and optimization method for a city road network in the post-earthquake emergency period.

关键词： city road network post-earthquake emergency period traffic demand resilience evaluation optimization model

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Carbonaceous ceramic nanofibrous aerogels for high-temperature thermal superinsulation

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Nano Research 2023年第4期16卷 5047-5055页

作者： Shubin Fu Dizhou Liu Yuanpeng Deng Jingran Guo Han Zhao Jian Zhou Pengyu Zhang Hongxuan Yu Shixuan Dang Jianing Zhang Hui Li Xiang Xu Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China

Ultralight ceramic aerogels are attractive thermal superinsulating materials,but display a formidable tradeoff between low and high temperature thermal conductivity(κ)due to their low-density *** carbon species as infrared opacifier in ultralight ceramic aerogels can substantially reduce the thermal radiation heat transfer without compromising the ultralow solid ***,the oxidation resistance of embedded carbon species still remains inadequate to prevent thermal etching at high ***,we report a carbonaceous design and synthesis of ceramic nanofibrous aerogels with amorphous carbon embedded in the yttrium-stabilized zircon nanofibers to achieve a high-temperature thermal superinsulating performance with robust thermomechanical *** aerogels display one of the lowestκof 95 mW·m^(−1)·K^(-1)at 1,000℃in air among ultralight material family,as well as robust mechanical flexibility with up to 95%compressive strain,30%non-linear fracture strain,and 99%bending strain,and high thermal stability with ultralow strength degradation less than 1%after sharp thermal shocks(240℃·s^(-1))and working temperature up to 1,200℃.The combined high-temperature thermal superinsulating and thermomechanical properties offer an attractive material system for robust thermal insulation under extreme conditions.

关键词： carbonaceous ceramic aerogels radiation opacification thermal insulation mechanical flexibility thermal stability

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Seismic behavior of FRP-retrofitted rectangular RC columns subjected to oblique horizontal earthquake actions

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Construction and Building Materials 2025年 482卷

作者： Zhu, Furui Zhang, Mengjie Zhang, Dawei Wang, Daiyu Wang, Zhenyu Zhang, Yaodong 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 Department of Civil Construction and Environmental Engineering North Dakota State University Fargo58102 United States School of Civil Engineering Yantai University Yantai264005 China

Externally wrapped fiber-reinforced polymer (FRP) confinement has proven effective in improving the seismic performance of reinforced concrete (RC) columns. However, existing seismic design recommendations are primarily based on quasi-static cyclic test results applied along the principal axis of the column section, which cannot accurately reflect the true characteristics of earthquakes. In this study, two 1/2-scale FRP-retrofitted rectangular RC columns were subjected to shaking table tests with ground motion input directions at 30° and 60° to the strong axis of the cross-section, respectively. The seismic performance, including damage mode, natural frequency, acceleration, displacement and strain response, torsional effect, and energy dissipation, was thoroughly analyzed. The result found that FRP-retrofitted rectangular RC columns exhibited completely different damage modes under shaking table tests compared to quasi-static loading, from previous ductile flexural failure to unfavorable flexural-shear-torsional failure, with more and wider cracks, more significant deformation, and more severe damages. These findings suggest that conclusions drawn from quasi-static tests tend to overestimate the retrofitting effect of FRP, and retrofitting only the plastic hinge zone of RC columns is insufficient to ensure structural safety, which should be considered in future seismic strengthening design criteria for RC structures. © 2025

关键词： Earthquake effects

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Experimental study on square RC short columns strengthened with corrugated steel jacket under axial compression

arXiv

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arXiv 2025年

作者： Fan, Yang Ligui, Yang Yuyin, Wang Yong, Fang Shuangshuang, Jin Yunwen, Chen Qilong, Xia No.3 Construction Co. Ltd. Chongqing Construction Engineering Group China School of Civil Engineering Chongqing Jiaotong University Chongqing400074 China Key Lab of Structures Dynamic Behaviour and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

In the long-term service of life, structural columns may experience mechanical performance degradation due to environmental erosion, various hazards, and functional modifications. This study proposes a novel concrete column reinforcement method utilizing square corrugated steel jackets as external confinement components, which significantly enhances both bearing capacity and ductility of original members. To investigate the mechanical performance improvement mechanisms and load-carry mode, 10 axially compressed short column specimens were designed. Detailed analyses were conducted surrounding the effects of connection methods for corrugated sheets, corrugated steel thickness, and damage levels on load-displacement curves, as well as stress and strain development patterns. A computational model for ultimate bearing capacity of reinforced sections was established. key findings include: (1) The use of corrugated steel sleeves can enhance the ultimate bearing capacity of the original short columns by 34.6% to 67.3%. (2) Considering that the confinement effect of square sleeves is not optimal, it is more material-efficient to use thinner corrugated steel plates to achieve similar results. (3) There is no significant difference in the effects of connection types on mechanical performance. (4) The cracking and softening of damaged concrete can enhance the confinement effect in corrugated steel-strengthened reinforced concrete columns. (5) The confined concrete strength model can be used to accurately predict the ultimate bearing capacity. Copyright © 2025, The Authors. All rights reserved.

关键词： Axial compression

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Axial compressive behavior of concrete-filled double-skin steel tubular columns with localized cracks

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structures 2025年 78卷

作者： Tong Zhang Shiqi Huang Shan Gao School of Civil Engineering Liaoning Technical University Fuxin Liaoning 123000 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150000 China

Concrete-filled double-skin steel tubular (CFDST) columns are widely used in a wide range of applications such as high-rise buildings, long-span bridges, offshore platforms, and heavy-duty industrial structures. However, due to the exposed steel tube, the external steel tube of CFDST columns is prone to cracking during long-term service, which affects their normal and safe use. This paper presents the mechanical behavior of CFDST columns with localized cracks. The peak load, failure mode, and full-range load-strain curve were produced according to the FE (finite element) model which were all line up with the findings of the experimental study. The impact of localized cracks on the CFDST stub struts in terms of peak load, stiffness, and flexibility is evaluated. The results indicate that the crack length, crack width, and crack depth exert minimal influence on the ultimate load and stiffness of the specimen. The crack length, crack width, and crack depth significantly impact the specimen's ductility. The ductility of the specimen is rapidly reduced by 30.9 %, especially when the steel tubes are penetrated due to corrosion. The crack angle barely impacts the breaking strength of the specimen. As the crack angle increases, the stiffness gradually decreases and the ductility gradually increases. A predictive technique of an error of less than 6 % is shown for the axial compressive capacity of CDFST pile columns with localized cracks. Finally, the GA-BP neural network model demonstrates its improved accuracy and generalization ability by comparing the genetic algorithm to a standard BP neural network, exhibiting higher the coefficient of determination and lower prediction errors on training and test datasets.

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Aerodynamic design and analysis for offshore wind turbine blade model

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Energy 2025年 330卷

作者： Ziyang Zhang Wen-Li Chen Jiabin Liu 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 Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Model experiments are essential for designing and analysing offshore wind turbines. During the scaling process of the model, the rotor thrust significantly decreases due to the Reynolds number effect. As wind turbines increase in size, blade length also gradually increases. The scaling ratio of the model decreases due to laboratory size constraints, affecting the structural loading characteristics. Therefore, this study performs an aerodynamic design for model blades, considering the Reynolds number effects and geometric dimensions. The optimised blade satisfies the scaled model's thrust requirements when its length is shorter than the scaled prototype blade. We employed the low Reynolds number airfoil SG 6043 to optimise the model blade. The geometric parameters of the optimised blades were calculated using the blade element momentum theory and pattern search method. Wind tunnel experiments were conducted on the optimised blade to analyse the variation characteristics of rotor thrust. The research results show that the numerical calculation results of rotor thrust generally align with the experimental results. The rotor thrust of the optimised blades was significantly enhanced, meeting the scaled model's thrust requirements. The error between the optimised blade's rotor thrust and the scaled target value is less than 2 %.

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Experimental and numerical studies on axial residual capacity of HSCHS tube after lateral impact

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Thin-Walled structures 2025年 215卷

作者： Kaiyun Yang Ximei Zhai Huaxiao Gao 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

In this paper, experimental works of 19 impacted high-strength steel circular hollow section (HSCHS) specimens and one non-impacted specimen were carried out, to obtain their axial residual compressive performance subjected to compressive loading The experiments were performed using an electro-hydraulic servo press, and the results were analyzed in terms of failure mode, load–displacement relationship, strain, and deformation. The effect of impact energy, diameter-to-thickness ratio, axial compression ratio and hammer head type on the axial residual capacity of HSCHS tubes was investigated. The failure modes observed from the tests presented a combination of overall instability and local buckling. The finite element (FE) model of HSCHS tube subjected first to lateral impact and then to axial compression loading was established using nonlinear FE analysis platform ANSYS/LS-DYNA. After verifying the accuracy of the FE model by comparison with the test results, a parameter analysis was conducted to reveal the influence of impact energy, diameter-to-thickness ratio, axial compression ratio, impact location and slenderness ration on axial residual capacity. Finally, based on the FE analysis, two simplified calculation equations were proposed to predict the axial residual capacity of HSCHS tube, providing reasonably good correlation with the experimental results.

关键词： Buckling modes

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