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学者姓名:周宏元
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Abstract :
Foam-filled honeycombs have been widely applied due to their excellent load transfer mitigation and energy absorption capacity. In the present study, a layered graded foam concrete-filled auxetic honeycomb was proposed by tuning its overall compression deformation mode to layer-by-layer deformation mode to realize multi-level structural protection. The effect of the honeycomb cell-wall thickness gradient (with an average thickness of 0.25 mm, thickness gradients of 0.30:0.25:0.20, 0.35:0.25:0.15 and 0.40:0.25:0.10, and corresponding positive gradients) and the foam concrete filler density gradient (408:575:848, 848:575:408) on the response mode, load transfer, energy absorption, and Poisson's ratio of the proposed composite was systematically investigated. The results showed that the graded composite exhibited an obvious layered deformation mode and a negative Poisson's ratio effect under relatively low and moderate loading rates (1 m/s, 10 m/s, respectively), especially with the foam concrete density gradient. Under a high loading rate (100 m/s), the graded composite demonstrated progressive collapse initiating from the loading end with a layer-by-layer crushing mode, regardless of the thickness and density gradient. In the response of the composite with a 0.2:0.2:0.2 thickness ratio and a 408:575:848 foam concrete gradient subjected to 1 m/s crushing, the first-layer, second-layer, and third-layer foam concrete absorbed 94.62%, 88.72%, and 86.94% of the total foam concrete energy absorption in the corresponding crushing stage, respectively. Compared with the counterpart homogeneous composites, although the graded composite had an insignificant improvement on energy absorption (less than 5%), it was able to significantly reduce the peak load (as high as 30%) to mitigate the load transfer to the protected structure. The effective Poisson's ratio of the first layer in the composite with positive gradient (408:575:848) increased to -2 then converged to -0.6 under 2 m/s and 10 m/s crushing, and ranged from -0.4 to -0.1 under 50 m/s and 100 m/s crushing, respectively. The effective Poisson's ratio of the middle and bottom layers increased to -2 initially and converged to range -0.4 to -0.1, regardless of the crushing speed. The staged response mode of the graded composite facilitated the realization of multi-level structure protection with significantly reduced peak load transferred to the protected structure and tuned energy absorption.
Keyword :
impact mitigation impact mitigation auxetic honeycomb auxetic honeycomb structure protection structure protection energy absorption energy absorption foam concrete foam concrete
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GB/T 7714 | Wang, Xiaojuan , Jia, Kuncheng , Liu, Yan et al. In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs [J]. | MATERIALS , 2023 , 16 (2) . |
MLA | Wang, Xiaojuan et al. "In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs" . | MATERIALS 16 . 2 (2023) . |
APA | Wang, Xiaojuan , Jia, Kuncheng , Liu, Yan , Zhou, Hongyuan . In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs . | MATERIALS , 2023 , 16 (2) . |
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Abstract :
To dissipate a large amount of blast energy as well as realize a reasonable load transfer to the beam and column instead of the vulnerable wall in the frame structure, this study employs a novel double-layered system to protect the infilled vulnerable masonry wall to resist blast loads. The system comprises a sacrificial cladding directly exposed to the blast to dissipate energy and connectors to facilitate load transfer and mitigation. Based on the quasi-static compressive test on the connector, the field blast test on the sacrificial cladding and frame structure with an infilled masonry wall, their respective numerical models are established and validated with ANSYS/LS-DYNA, which facilitates the model establishment of the frame structure protected by the double-layered system subjected to blast load. The numerical results indicate that the system effectively mitigates the damage to the masonry wall and reduces the load transferred to the frame compared to that without protection. However, large bending deformation of the sacrificial cladding may still result in collision damage to the vulnerable wall which makes it difficult to be applied in engineering practice. To improve the protective performance of the double-layered system and reduce the possibility of the occurrence of a collision between the sacrificial cladding and the wall, several measures, including connector layout optimization, rear plate strengthening with stiffeners, and appropriate connector height determination have been proposed. The numerical results demonstrate that installing connectors at four edges, adding 5 x 5 stiffeners on the rear surface of the sacrificial cladding, and appropriately designing the height of the connector can significantly enhance the double-layered system's protective performance, which has practical significance in protecting vulnerable masonry wall in frame structure from blast loads.
Keyword :
Protective performance Protective performance Blast load Blast load Double-layered system Double-layered system Energy absorption Energy absorption Load transfer Load transfer
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GB/T 7714 | Zhang, Xuejian , Wang, Xiaojuan , Zhou, Hongyuan et al. Improving blast protection of double-layered system for infilled masonry wall in frame structure [J]. | THIN-WALLED STRUCTURES , 2023 , 190 . |
MLA | Zhang, Xuejian et al. "Improving blast protection of double-layered system for infilled masonry wall in frame structure" . | THIN-WALLED STRUCTURES 190 (2023) . |
APA | Zhang, Xuejian , Wang, Xiaojuan , Zhou, Hongyuan , Zhang, Wenxue , Song, Tianyi , Wang, Yonghui et al. Improving blast protection of double-layered system for infilled masonry wall in frame structure . | THIN-WALLED STRUCTURES , 2023 , 190 . |
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Abstract :
A novel cladding-connector system with excellent energy absorption capacity was proposed to protect vulnerable walls in frame structures subjected to blast load in the present study. The cladding-connector system was constructed by combining a sacrificial cladding consisting of an aluminum foam core sandwiched by two steel plates and four connectors made of corrugated steel tubes. On one hand, the cladding absorbed a considerable amount of blast energy. On the other hand, the connectors controlled the load transfer to the protected structure to certain specific pre-defined value. With this approach, both relatively high energy absorption and relatively low load transfer can be achieved simultaneously. Specifically, based on the quasi-static compression test on the connectors and the field blast test on the sacrificial cladding, the numerical model of the proposed system was established with ANSYS/LS-DYNA and validated with the test results. Then the deformation mode, energy dissipation, and load transfer of the cladding-connector systems with flexible or rigid connectors under various charge weights were numerically studied and compared. Results showed that the proposed cladding-connector systems could dissipate a considerable amount of energy under blast, in which the major part was dissipated by the cladding and the rest by the connectors. Particularly, compared to the cladding-connector system with rigid connectors, the cladding-connector system with flexible connectors exhibited superior performance in terms of energy absorption and load transfer, especially under intense blast. With the merits of excellent energy absorption, significant blast intensity reduction, and load shift from the vulnerable walls to the load-bearing components, the proposed cladding-connector system with flexible connectors was more promising to effectively protect the existing frame structures against blast.
Keyword :
Blast load Blast load Cladding-connector system Cladding-connector system Load transfer Load transfer Protective structures Protective structures Energy absorption Energy absorption
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GB/T 7714 | Zhang, Xuejian , Wang, Xiaojuan , Zhou, Hongyuan et al. Blast mitigation performance of a novel cladding-connector system [J]. | THIN-WALLED STRUCTURES , 2022 , 184 . |
MLA | Zhang, Xuejian et al. "Blast mitigation performance of a novel cladding-connector system" . | THIN-WALLED STRUCTURES 184 (2022) . |
APA | Zhang, Xuejian , Wang, Xiaojuan , Zhou, Hongyuan , Du, Xiuli , Zou, Hai-Lin , Song, Tianyi et al. Blast mitigation performance of a novel cladding-connector system . | THIN-WALLED STRUCTURES , 2022 , 184 . |
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Abstract :
This study aims to propose a coupled controller of tuned mass damping (TMD) and nonlinear energy sink (NES) for enhancing the stability and suppressing nonlinear vibrations of slender structures, such as tall buildings subjected to cross airflows. The nonlinear governing equations are established to describe the coupled vibrations of the slender structure with the controller. Subsequently, a linear analysis is performed to indicate the positive effect of proposed controllers on increasing the onset speed of galloping for the slender structure. A nonlinear analysis is conducted to state the mechanism of controllers on reducing oscillations of the slender structure. The results show that the coupled controller has better effects on whether enhancing the onset speed or oppressing the structure's vibration amplitudes. A parametric analysis is then carried out to design an optimal coupled controller. The distributed controllers are designed in the structure, indicating that there is an optimal number for the controller where the onset speed is peak depending on the mass ratio. The present study can provide beneficial guidance and design for controlling the cross-flow-induced vibrations of slender structures in engineering applications.
Keyword :
Nonlinear dynamics Nonlinear dynamics TMD TMD Coupled galloping Coupled galloping NES NES Vibration control Vibration control
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GB/T 7714 | Zhou, K. , Dai, H. L. , Abdelkefi, A. et al. Cross-flow-induced transverse-torsional vibrations of slender structures mitigation via coupled controllers [J]. | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS , 2022 , 142 . |
MLA | Zhou, K. et al. "Cross-flow-induced transverse-torsional vibrations of slender structures mitigation via coupled controllers" . | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS 142 (2022) . |
APA | Zhou, K. , Dai, H. L. , Abdelkefi, A. , Zhou, H. Y. , Wang, L. , Ni, Q. . Cross-flow-induced transverse-torsional vibrations of slender structures mitigation via coupled controllers . | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS , 2022 , 142 . |
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Abstract :
To take advantage of various types of dynamic measurement data for structural damage detection, an identification strategy based on cross-correlation function with data fusion of various dynamic measurements was proposed to improve the accuracy of damage identification in the present study. First of all, the cross-correlation functions among the easily acquired strain, acceleration, and displacement responses were theoretically derived when the structure was subjected to ambient excitations. Furthermore, an identification strategy was proposed for structural damage detection with the objective function of minimizing the difference between the measured and computed cross-correlation function under multiple unknown ambient excitations. In the proposed strategy, four optimization methods, namely, gradient search, genetic algorithm, particle swarm optimization, and the hybrid method of particle optimization method and gradient search were applied as the search engine to identify structural unknown damage index. Moreover, the performance of the proposed identification strategy was examined by the numerical studies on a two-dimensional and a three-dimensional truss as well as the experimental study on a cantilever beam. These results showed that the cross-correlation function among different types of vibration measurements could significantly improve the accuracy of the identification results, meanwhile, the proposed strategy exhibited excellent robustness to the measurement noise. In addition, the performance of the proposed strategy with different combinations of vibration data and the influence of reference data on the accuracy of damage identification results were further investigated.
Keyword :
Multiple unknown ambient excitations Multiple unknown ambient excitations Data fusion Data fusion Structural damage detection Structural damage detection Intelligent optimization algorithm Intelligent optimization algorithm Cross -correlation function Cross -correlation function
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GB/T 7714 | Wang, Xiaojuan , Chen, Feng , Zhou, Hongyuan et al. Structural damage detection based on cross-correlation function with data fusion of various dynamic measurements [J]. | JOURNAL OF SOUND AND VIBRATION , 2022 , 541 . |
MLA | Wang, Xiaojuan et al. "Structural damage detection based on cross-correlation function with data fusion of various dynamic measurements" . | JOURNAL OF SOUND AND VIBRATION 541 (2022) . |
APA | Wang, Xiaojuan , Chen, Feng , Zhou, Hongyuan , Ni, Pinghe , Wang, Lihui , Zhang, Jian . Structural damage detection based on cross-correlation function with data fusion of various dynamic measurements . | JOURNAL OF SOUND AND VIBRATION , 2022 , 541 . |
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Abstract :
以快硬硫铝酸盐水泥为结合剂,与陶粒、预制泡沫混合制备得到陶粒泡沫混凝土.探讨了泡沫混凝土密度与陶粒粒径匹配关系对陶粒泡沫混凝土在静态单轴压缩下的破坏模式、抗压强度、压实应变和能量吸收的影响.结果表明:随着泡沫混凝土密度的提高或陶粒粒径的增大,陶粒泡沫混凝土发生非界面破坏的现象逐渐显著,由此确定出与3种粒径陶粒相匹配的泡沫混凝土的密度范围;随着泡沫混凝土密度的提高,陶粒泡沫混凝土的抗压强度和能量吸收能力均显著提高,压实应变随之减小;随着陶粒粒径的增大,陶粒泡沫混凝土的抗压强度先增后减,压实应变先减后增,能量吸收能力逐渐增强.
Keyword :
强度匹配 强度匹配 能量吸收 能量吸收 破坏模式 破坏模式 抗压强度 抗压强度 陶粒泡沫混凝土 陶粒泡沫混凝土 压实应变 压实应变
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GB/T 7714 | 王小娟 , 刘路 , 贾昆程 et al. 陶粒泡沫混凝土的力学性能及吸能特性 [J]. | 建筑材料学报 , 2021 , 24 (01) : 207-215 . |
MLA | 王小娟 et al. "陶粒泡沫混凝土的力学性能及吸能特性" . | 建筑材料学报 24 . 01 (2021) : 207-215 . |
APA | 王小娟 , 刘路 , 贾昆程 , 周宏元 . 陶粒泡沫混凝土的力学性能及吸能特性 . | 建筑材料学报 , 2021 , 24 (01) , 207-215 . |
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Abstract :
Swarm intelligence optimization algorithms have been widely used in structural identification due to its powerful search ability, while an unpleasant identification result is regularly achieved with predefined wide search range. To address this issue, a hybrid strategy, initially reducing search space by adaptive sampling test and then identifying the actual structural parameters with improved butterfly optimization algorithm (IBOA) in the reduced search range by adaptive search space reduction method, is proposed and employed in this paper. In one aspect, the clustering competition learning mechanism and the chaotic elite learning mechanism are introduced to improve the performance of butterfly optimization algorithm (BOA). In the other aspect, adaptive sampling test and search space reduction method are also developed for search space reduction of unknown parameters. Genetic algorithm, BOA, IBOA, and proposed hybrid sampling and IBOA (sampling-IBOA) are evaluated by numerical examples of simply-supported beam and truss structure, as well as an experimental test of steel grid benchmark structure for comparative study. In addition, the effect of the window width, four different sampling methods, hybrid Ham-IBOA and gradient search on application of the proposed sampling-IBOA method are further illustrated. The numerical and experimental results demonstrate that the proposed sampling-IBOA method can significantly improve computational efficiency and identification accuracy, especially for Hammersley sequence sampling among the four sampling methods.
Keyword :
Hammersley sequence sampling Hammersley sequence sampling Sampling methods Sampling methods Swarm intelligence methods Swarm intelligence methods Structural identification Structural identification Improved butterfly optimization algorithm Improved butterfly optimization algorithm
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GB/T 7714 | Zhou, Hongyuan , Zhang, Guangcai , Wang, Xiaojuan et al. Structural identification using improved butterfly optimization algorithm with adaptive sampling test and search space reduction method [J]. | STRUCTURES , 2021 , 33 : 2121-2139 . |
MLA | Zhou, Hongyuan et al. "Structural identification using improved butterfly optimization algorithm with adaptive sampling test and search space reduction method" . | STRUCTURES 33 (2021) : 2121-2139 . |
APA | Zhou, Hongyuan , Zhang, Guangcai , Wang, Xiaojuan , Ni, Pinghe , Zhang, Jian . Structural identification using improved butterfly optimization algorithm with adaptive sampling test and search space reduction method . | STRUCTURES , 2021 , 33 , 2121-2139 . |
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Abstract :
Although fruitful research results have been achieved on the investigation of size effect of natural coarse aggregate concrete (NAC), limited research is devoted to the study on size effect of recycled coarse aggregate concrete (RAC). Meanwhile, the feasibility of applying these results on NAC to RAC is questionable. To this end, a synthesis of experimental studies with different recycled coarse aggregate (RCA) substitute rates (0%, 30%, 50%, 70% and 100%), different prismatic sizes of 70 x 70 x 210, 100 x 100 x 300, 150 x 150 x 450 and 200 x 200 x 600 mm are carried out to investigate the size effect of RAC with consideration of the influence of substitute rate. As a powerful complement to the experimental study, the meso-scale numerical simulation is carried out. These results show that increasing the specimen size and RCA substitute rate both leads to decreasing nominal compressive strength of RAC. Furthermore, the meso-scale numerical simulation results show that the oblique concentrated damage zone is more likely to form in the specimens with higher RCA substitute rates, which exhibits more significant size effect. In addition, the size effect law of RAC is established based on the empirical formula and back-propagation neural network, respectively, both providing an accurate prediction of nominal compressive strength of RAC with consideration of specimen size and RCA substitute rate, and the results provide some references for the design specification of RAC members.
Keyword :
Uniaxial compression tests Uniaxial compression tests Recycled coarse aggregate concrete Recycled coarse aggregate concrete Static size effect Static size effect Recycled coarse aggregate substitute rate Recycled coarse aggregate substitute rate Back-propagation neural network Back-propagation neural network
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GB/T 7714 | Zhou, Hongyuan , Zhou, Houzhan , Wang, Xiaojuan et al. Static size effect of recycled coarse aggregate concrete: Experimental study, meso-scale simulation, and theoretical analysis [J]. | STRUCTURES , 2021 , 34 : 2996-3012 . |
MLA | Zhou, Hongyuan et al. "Static size effect of recycled coarse aggregate concrete: Experimental study, meso-scale simulation, and theoretical analysis" . | STRUCTURES 34 (2021) : 2996-3012 . |
APA | Zhou, Hongyuan , Zhou, Houzhan , Wang, Xiaojuan , Cao, Wanlin , Song, Tianyi , Qiao, Qiyun . Static size effect of recycled coarse aggregate concrete: Experimental study, meso-scale simulation, and theoretical analysis . | STRUCTURES , 2021 , 34 , 2996-3012 . |
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Abstract :
陶粒泡沫混凝土的力学性能及吸能特性
Keyword :
破坏模式 破坏模式 压实应变 压实应变 强度匹配 强度匹配 陶粒泡沫混凝土 陶粒泡沫混凝土 能量吸收 能量吸收 抗压强度 抗压强度
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GB/T 7714 | 王小娟 , 刘路 , 贾昆程 et al. 陶粒泡沫混凝土的力学性能及吸能特性 [J]. | 王小娟 , 2021 , 24 (1) : 207-215 . |
MLA | 王小娟 et al. "陶粒泡沫混凝土的力学性能及吸能特性" . | 王小娟 24 . 1 (2021) : 207-215 . |
APA | 王小娟 , 刘路 , 贾昆程 , 周宏元 , 建筑材料学报 . 陶粒泡沫混凝土的力学性能及吸能特性 . | 王小娟 , 2021 , 24 (1) , 207-215 . |
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Abstract :
Precast concrete structures have become a popular option among available structural forms for their superior mechanical characteristics, economy and sustainable development as well as architectural versatility. However, some technical problem such as complex load path, uncertainty of structural stiffness of beam-column joints and inconvenience for disassembly hinders the application and development of precast concrete structures. In this study, an innovative hybrid beam-column connection is proposed with hierarchy of strong connection and weak structural members for precast concrete structures. An experimental and numerical study is organized to study the seismic behavior of the proposed connection including hysteretic curves, skeleton curves and dissipation capacity. The experimental results showed that the new hybrid beam-column connection can reduce the stress concentration effect at the joint and achieve comparable mechanical performance with cast-in-site connections. A numerical investigation on the seismic behavior of the hybrid beam-column connection is carried out. The benchmark models are initially created and validated against the test data and after that a small-scale parametric study is organized. The effect of the position of I-sectional connector (d), the length of cladding plates (l) and axial compression ratio (α) on seismic behavior of the hybrid beam-column connection is investigated and analyzed. © 2020 Elsevier Ltd
Keyword :
Concrete buildings Concrete buildings Architectural Concrete Architectural Concrete Concrete construction Concrete construction Stiffness Stiffness Seismic response Seismic response Precast concrete Precast concrete
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GB/T 7714 | Ye, M. , Jiang, J. , Chen, H.M. et al. Seismic behavior of an innovative hybrid beam-column connection for precast concrete structures [J]. | Engineering Structures , 2021 , 227 . |
MLA | Ye, M. et al. "Seismic behavior of an innovative hybrid beam-column connection for precast concrete structures" . | Engineering Structures 227 (2021) . |
APA | Ye, M. , Jiang, J. , Chen, H.M. , Zhou, H.Y. , Song, D.D. . Seismic behavior of an innovative hybrid beam-column connection for precast concrete structures . | Engineering Structures , 2021 , 227 . |
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