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

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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Comparjsion of seismic performance of rc precast fabricated shear wall with different infillled opening

Comparjsion of seismic performance of rc precast fabricated ...

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2015 fib Symposium: Concrete - Innovation and Design

作者： Zhai, Ximei Hu, Wenbo Key Lab. of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin Heilongjiang150090 China

A new method to infill the opening in the RC precast fabricated concrete shear wall was applied in China. In this paper, three geometrically identical RC precast fabricated shear wall specimens were experimented under constant axial load and quasi-statie cyclic lateral loading. The methods to infill the opening of the wall were respectively integration infill, masonry infill and without infill. Hysteretic curves, skeleton curves, failure process, variation of rebar strain, stiffness, ductility and energy-dissipating capacity were obtained. The results showed that the integration shear wall owns good seismic performance. Its bearing capacity, stiffness, energy-dissipating capacity are excellent while ductility is relatively poor. Masonry infilled wall and wall without infill also own good seismic performance. Meanwhile, numerical simulation of three specimens was conducted by using finite element (FE) software OpenSees. Based on the reasonable modeling and the application of multi-layer shell element, the FE results were verified with the experimental results.

关键词： Shear walls

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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 lab.ratory 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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A novel tuned heave plate system for heave motion suppression and energy harvesting on semi-submersible platforms

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Science China(Technological Sciences) 2016年第6期59卷 897-912页

作者： LIU Kun OU Jin Ping School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Institute of Ocean Deep Water Engineering Dalian University of Technology

Deepwater offshore structures such as semi-submersible platforms suffer powerful ocean waves due to their location and site condition. The long distance away from the shore also brings many difficulties to energy supply for the platform operation. How to reduce the response of the platform and convert the wave energy into electrical power is a meaningful topic. In this paper, a tuned heave plate system(THP) is presented and designed to be employed on a semi-submersible platform for heave motion suppression and energy harvesting. This THP system is composed of spring supports, a power take-off system(PTO), and a heave plate. The PTO system is a permanent magnet linear generator(PMLG), which could directly convert the kinetic energy of the heave plate into electronic power. The stiffness of the spring supports is designed based on the principle of the tuned mass damper(TMD). The numerical model of the platform and the THP system is established according to the hydrodynamic analysis results of the platform. The model is tested and modified by scale model tests on the platform in the wave tank. A parameter study, including the size, tuned period, and damping ratio of the THP system, is conducted systematically based on the numerical model. The optimal parameters of the THP are selected due to the maximum heave motion reduction under severe wave conditions in South China Sea. The performance of the semi-submersible with and without the THP system under different wave conditions is analyzed. It is demonstrated that this novel tuned heave plate system could reduce the heave motion of the semi-submersible platform significantly and generate considerable power, which makes the THP system have a broad prospect for development.

关键词： heave motion semi-submersible wave energy harvesting wave energy converter TMD

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Experimental study on seismic performance of reinforced concrete frame columns supported with post-build wing walls

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Open Civil Engineering Journal 2017年 11卷 82-91页

作者： Fan, Yang Ying, Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090 China

Six specimens of concrete frame columns reinforced by post-build wing walls on the opposite faces were designed and fabricated to investigate their seismic performance. Axial compression ratio was considered as the critical factor and divided into 0.31, 0.36, and 0.40 before reinforcement. HRB400 steel grade was used to the longitudinal bar and the ratio of longitudinal reinforcement divided into 1.23%, 1.05% and 0.82%, stirrup reinforcement ratio was 0.6%, and the stirrups were made by HPB300 steel grade. To meet with requirement of ‘strong shear, weak bending’, the ratio of the shear span to effective depth of columns was equal to 2.4. All specimens were subjected into cyclic reversing load. The testing results showed that wing walls reinforced significantly increased the seismic bearing capacity of the specimens and the wing walls damaged seriously, but the columns were not. The limited drift was ranged from 0.021 to 0.033. The post-build wing walls under horizontal motion may dissipate energy effectively while ensuring that the existing columns without obvious damage under vertical loads and earthquake strong motion. © Fan and Ying;Licensee Bentham Open.

关键词： Anti-seismic reinforcement Axial compression ratio Concrete frame column Energy consumption Post-build wing wall

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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： Yang, Kaiyun Zhai, Ximei Gao, Huaxiao 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

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. © 2025

关键词： Buckling modes

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Study of the mechanics of progressive collapse of FPB isolated beam-pier substructures

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 718-728页

作者： Jingcai ZHANG Yong DING Xinchun GUAN 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 Disasters of the Ministry of Industry and Information Harbin Institute of TechnologyHarbin 150090China

The horizontal stiffness of the isolated layer is reduced substantially by a friction pendulum bearing(FPB)toprotectthe structure from potential damages caused by ***,horizontal stiffness is essential to progressive collapse resistance of *** paper presents a simplified model to assess the progressive collapse response of beam-pier substructure isolated by *** collapse resistance by flexural action of the beam and additional resistance owing to the horizontal restraining force was *** influences of the equivalent radius and friction coefficient of the FPB,the applied axial force on the FPB,and span-depth ratio of the beam on the additional resistance were *** were conducted to verify the proposed *** results show that progressive collapse resistance provided by horizontal restraining can be reduced as large as 46%and 88%during compressive arching action(CAA)and catenary action(CA),*** equivalent radius of the FPB shows limited effect on the progressive collapse response of FPB isolated structures,but friction coefficient and applied axial force,as well as depth ratio of the beam,show significant influences on the additional progressive collapse resistance *** element method(FEM)results are in good agreement with the result obtained by the proposed method.

关键词： friction pendulum bearing progressive collapse horizontal stiffness compressive arching action catenary action

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Numerical investigation on prestressed shear key splice connections for onshore wind turbine foundations

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Engineering structures 2025年 339卷

作者： Zhang, Dongliang Liu, Wantong Wang, Fei Yu, Zhe Wu, Xiangguo Li, Tianhao Fu, Kun Magar, Anish Thapa Hwang, Hyeon-Jong Xian, Xiangping PowerChina Huadong Engineering Corporation Limited Hangzhou311122 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Department of Architecture and Civil Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Tong999077 Hong Kong College of Civil Engineering Fuzhou University Fuzhou350108 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 the Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Architecture Konkuk University Seoul05029 Korea Republic of

Prestressed shear key splice connections are used for the assembly of prefabricated foundation modules in wind turbine towers. This study proposed a simplified section analysis to estimate the flexural moment strength of the shear key splice connections. The proposed method considered the structural deformation and unbonded prestressing tendon effect. Further, to investigate the effects of loading type, initial prestressing force, and shear span-to-depth ratio on the structural performance of the shear key splice connections, finite element analysis was performed on the precast segmental beams using the shear key splice connections. The section analysis results were compared to the finite element analysis results of the precast segmental beams under various initial prestressing forces, and the section analysis results agreed with the finite element analysis results. The shear span-to-depth ratio significantly affected the structural performance of the shear key splice connections. As the shear span-to-depth ratio decreased, the shear resistance increased because the failure mode changed from flexural failure due to the separated shear keys to direct shear failure of the shear keys. © 2025 Elsevier Ltd

关键词： Structural dynamics

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Study on the effect of ground motion direction on the response of engineering structure

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Earthquake Engineering and Engineering Vibration 2016年第4期15卷 649-656页

作者： Sun Menghan Fan Feng Sun Baitao Zhi Xudong Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology School of Civil Engineering Harbin Institute of Technology Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration

Due to the randomness of earthquake wave magnitude and direction, and the uncertain direction of strong axis and weak axis in the construction of engineering structures, the effect of the direction of ground motion on a structure are studied herein. Ground motion records usually contain three vertical ground motion data, which are obtained by sensors arranged in accordance with the EW （East -West） direction, NS （South- North） direction and perpendicular to the surface （z） direction, referring to the construction standard of seismic stations. The seismic records in the EW and NS directions are converted to Cartesian coordinates in accordance with the rotation of θ = 0°-180°, and consequently, a countless group of new ground motion time histories are obtained. Then, the characteristics of the ground motion time history and response spectrum of each group were studied, resulting in the following observations：（1） the peak and phase of ground motion are changed with the rotation of direction θ, so that the direction θ of the maximum peak ground motion can be determined; （2） response spectrum values of each group of ground motions change along with the direction θ, and their peak, predominant period and declining curve are also different as the changes occur; then, the angle θ in the direction of the maximum peak value or the widest predominant period can be determined; and （3） the seismic response of structures with different directions of ground motion inputs has been analyzed under the same earthquake record, and the results show the difference. For some ground motion records, such as the Taft seismic wave, these differences are significant. Next, the Lushan middle school gymnasium structure was analyzed and the calculation was checked using the proposed method, where the internal force of the upper space truss varied from 25% to 28%. The research results presented herein can be used for reference in choosing the ground motion when checking the actual damage to struct

关键词： direction of grotmd motion structure effect coordinate transformation response spectrum

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Experimental validation of a signal-based approach for structural earthquake damage detection using fractal dimension of time frequency feature

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Earthquake Engineering and Engineering Vibration 2014年第4期13卷 671-680页

作者： Tao Dongwang Mao Chenxi Zhang Dongyu Li Hui Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Center of Structural Monitoring and Control School of Civil Engineeing Harbin Institute of Technology

This article extends a signal-based approach formerly proposed by the authors, which utilizes the fractal dimension of time frequency feature （FDTFF） of displacements, for earthquake damage detection of moment resist frame （MRF）, and validates the approach with shaking table tests. The time frequency feature （TFF） of the relative displacement at measured story is defined as the real part of the coefficients of the analytical wavelet transform. The fractal dimension （FD） is to quantify the TFF within the fundamental frequency band using box counting method. It is verified that the FDTFFs at all stories of the linear MRF are identical with the help of static condensation method and modal superposition principle, while the FDTFFs at the stories with localized nonlinearities due to damage will be different from those at the stories without nonlinearities using the reverse-path methodology. By comparing the FDTFFs of displacements at measured stories in a structure, the damage-induced nonlinearity of the structure under strong ground motion can be detected and localized. Finally shaking table experiments on a 1：8 scale sixteen-story three-bay steel MRF with added frictional dampers, which generate local nonlinearities, are conducted to validate the approach.

关键词： earthquake damage detection time frequency feature fractal dimension signal-based shaking table test frictional damper

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