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学者姓名：周宏元
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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 ：
碳纳米管（CNT）不仅具有质量轻、强度高等优异的力学性能，而且化学性质稳定、耐酸碱腐蚀，因此被广泛应用于复合材料中. 为探究不同基体中CNT力学增强差异的原因，对CNT增强树脂基和铝合金基两种复合材料进行了准静态拉伸、三点弯和动态冲击实验，进一步揭示了CNT在不同基体中的增强机制. 研究结果表明：CNT可以有效提高树脂材料拉伸强度和冲击吸能，并且发现当CNT质量分数为0.7%时增强效果最佳；而对于铝合金，添加CNT会降低材料强度，并且CNT质量分数越高，材料拉伸强度越低. 金属基和树脂基加入CNT后力学增强效果不同的本质在于CNT与基体的界面结合性不同，树脂基初始状态为液体，固化后CNT可以填充在基体网络缝隙中，进而增强材料力学性能；而铝合金基为粉体，机械力分散使CNT产生损伤且CNT的存在导致粉体间缝隙变大，进而削弱材料力学性能. 研究成果可为CNT复合材料的制备与优化提供参考.
Keyword ：
碳纳米管 碳纳米管 环氧树脂 环氧树脂 拉伸强度 拉伸强度 复合材料 复合材料 铝合金 铝合金
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| GB/T 7714 | 朱秀芳 , 卢国兴 , 马书香 et al. CNT对树脂基和金属基材料的力学增强性能对比 [J]. | 北京理工大学学报 , 2023 , 43 (11) : 1187-1196 . |
| MLA | 朱秀芳 et al. "CNT对树脂基和金属基材料的力学增强性能对比" . | 北京理工大学学报 43 . 11 (2023) : 1187-1196 . |
| APA | 朱秀芳 , 卢国兴 , 马书香 , 周宏元 , 张宏 . CNT对树脂基和金属基材料的力学增强性能对比 . | 北京理工大学学报 , 2023 , 43 (11) , 1187-1196 . |
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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 ：
本发明公开一种抗多灾种可替换式防护构造装置，包括定位钢圈，定位钢圈可拆卸套设在建筑结构柱外侧，定位钢圈上安装有防护结构；防护结构包括若干防护层，若干防护层周向依次安装在定位钢圈上，每个防护层靠近定位钢圈的侧壁上开设有隔热结构。本发明的防护结构安装于地下结构、桥墩等建筑结构柱外围，可减少被保护结构与外界环境的接触，提高地下结构、桥墩等建筑结构柱耐久性。当受火灾、撞击及爆炸荷载作用导致防护结构破坏后，可迅速将其更换，减少了维修的时间，具有很强的经济效益。本发明的防护结构施工方便、成本更低、节能环保，还可以起到抗多灾种效果，更适用于土木工程领域。
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| GB/T 7714 | 周宏元 , 赵鑫宇 , 王小娟 et al. 一种抗多灾种可替换式防护构造装置及其安装方法 : CN202211195413.0[P]. | 2022-09-28 . |
| MLA | 周宏元 et al. "一种抗多灾种可替换式防护构造装置及其安装方法" : CN202211195413.0. | 2022-09-28 . |
| APA | 周宏元 , 赵鑫宇 , 王小娟 , 宋天诣 . 一种抗多灾种可替换式防护构造装置及其安装方法 : CN202211195413.0. | 2022-09-28 . |
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Abstract ：
本发明公开了一种疏油基地聚物复合发泡剂及其制备方法，属于发泡剂技术领域，复合发泡剂由发泡剂A和发泡剂B组成，其中，所述发泡剂A包括如下的重量的组分：水15～25份、食用胶0.1～0.15份和第一起泡剂0.3～0.6份；所述发泡剂B包括以下重量组分：水20～35份、第二起泡剂1～2.5份和稳泡剂1～1.5份。该发泡剂得到的预制泡沫与植物油、机油、脱模油、油性脱模剂等不相溶，成本较低、工艺简单、起泡效率高、泡沫稳定，节能环保且应用广泛。
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| GB/T 7714 | 王小娟 , 崔浩儒 , 周宏元 et al. 一种疏油基地聚物复合发泡剂及其制备方法 : CN202211189375.8[P]. | 2022-09-28 . |
| MLA | 王小娟 et al. "一种疏油基地聚物复合发泡剂及其制备方法" : CN202211189375.8. | 2022-09-28 . |
| APA | 王小娟 , 崔浩儒 , 周宏元 , 刘浩 . 一种疏油基地聚物复合发泡剂及其制备方法 : CN202211189375.8. | 2022-09-28 . |
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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 ：
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 ：
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 ：
The response of monolithic steel plates subjected to blast was extensively studied, and dozens of dimensionless numbers were proposed to predict the response. While the existing dimensionless numbers are not convenient to use in some scenarios with relatively complicated conditions, the dimensionless number proposed for blast loaded steel plates based on dimensional analysis extends the range of application. Different from other dimensionless numbers, the properties of medium with which the blast load transmits are incorporated to extend the application range to more general scenarios. The responses of the plate subjected to both near-field blast with non-uniform load and far-field blast with uniform load, i.e. both the external and internal blasts (for steel boxes), are reasonably predicted. The physical implication of the proposed dimensionless number is clear in that the media properties, geometrical features, characteristics of material, and loading are incorporated, which are readily available in test. A variety of test data are used to validate the applicability and versatility of the proposed dimensionless number.
Keyword ：
Dimensionless number Dimensionless number ground shock ground shock steel plate steel plate blast load blast load underwater explosion underwater explosion dynamic response dynamic response
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| GB/T 7714 | Zhou, Hongyuan , Cong, Pengli , Wang, Xiaojuan et al. A Dimensionless Number for Response of Blast Loaded Steel Plates [J]. | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2021 , 21 (05) . |
| MLA | Zhou, Hongyuan et al. "A Dimensionless Number for Response of Blast Loaded Steel Plates" . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 21 . 05 (2021) . |
| APA | Zhou, Hongyuan , Cong, Pengli , Wang, Xiaojuan , Song, Tianyi , Huang, Xin . A Dimensionless Number for Response of Blast Loaded Steel Plates . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2021 , 21 (05) . |
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Abstract ：
The global response of underground structures subjected to ground shock is investigated theoretically, experi-mentally and numerically. Non-zero rise time of ground shock is taken into account in the theoretical prediction. A scale model field test is conducted to examine the prediction accuracy, suggesting that the conventional method without ground shock rise time may result in over-design, while the present approach with rise time more reasonably predicts the global acceleration response which is the excitation to the affiliated devices inside the structure. Subsequently, shock response spectra of inside devices with mounting are established to evaluate the shock environment within the underground structure. Numerical simulation further complements the study. With combined approach, the key factors influencing the global response and in-structure shock of underground structures are discussed in detail, whose findings facilitate more reasonable design of underground structures in terms of shock environment assessment and mitigation.
Keyword ：
Underground structures Underground structures In-structure shock In-structure shock Ground shock Ground shock Dynamic soil-structure interaction Dynamic soil-structure interaction Global response Global response
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| GB/T 7714 | Zhou, Hongyuan , Cong, Pengli , Wang, Xiaojuan et al. Global response of underground structures subjected to ground shock with consideration of rise time [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 143 . |
| MLA | Zhou, Hongyuan et al. "Global response of underground structures subjected to ground shock with consideration of rise time" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 143 (2021) . |
| APA | Zhou, Hongyuan , Cong, Pengli , Wang, Xiaojuan , Wang, Yonghui , Dai, Huliang , Yu, Shangjiang et al. Global response of underground structures subjected to ground shock with consideration of rise time . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 143 . |
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