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Your search keyword '"Shen, Yongkang"' showing total 26 results
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26 results on '"Shen, Yongkang"'

2. Design of an Image Segmentation System Based on Hierarchical Density-Based Spatial Clustering of Applications with Noise for Off-Road Unmanned Ground Vehicles

Author

Wang, Jingguo, Wang, Yiquan, Wang, Jiandong, Shen, Yongkang, Zhao, Xijun, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Fu, Wenxing, editor, Gu, Mancang, editor, and Niu, Yifeng, editor

Published
2023
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9. Force analysis of grouting connection section of offshore wind turbine three pile foundation structure

Author

Zhong, Weiqiu, Guo, Qi, Shen, Yongkang, Li, Wuxu, Zheng, Longlong, and Chen, Weiping

Abstract

ABSTRACTOffshore wind farms are located in marine environments with complex hydrological, meteorological and submarine geological conditions, which pose difficulties for wind turbine foundation design and construction. Therefore, the study of the key technologies of offshore wind turbine foundation design has important theoretical value and practical significance for the assurance of structural safety, the optimization of structural design and the extension of structural service life. In this paper, a numerical simulation model of three pile foundation is established, and a detailed FEA model of grouted area is calculated and analyzed, and influence of grout on performance under different loading conditions is calculated and analyzed. The results show that it is feasible to use the p-y curve method to describe the pile-soil interaction of the three-pile foundation of the offshore wind turbine, the stress check of the whole foundation structure under ultimate load conditions and normal load conditions meets the requirements of the DNV specification, and the result of the fatigue damage check is that the fatigue strength requirement is met in 26.7 years, which indicates that the three-pile foundation structure of the offshore wind turbine is safe and reliable and can be operated safely.

Published
2024
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15. Effect of SiO2 Methyl Modification on the Performance of Nondispersible Underwater Concrete and Reinforcement Mechanism.

Author

Zhong, Weiqiu, Zheng, Longlong, Shen, Yongkang, Li, Wuxu, and Zeng, Lingwei

Subjects
FOURIER transform infrared spectroscopy, CONTACT angle, SURFACE tension, FREE surfaces, CONCRETE
Abstract

The effect of SiO2 methyl modification (CH3-NS) on various properties of the nondispersible underwater concrete (UWC) was evaluated. The fluidity and antiwashout resistance of the UWC mixture were evaluated by various tests. Concrete specimens were designed in the two different damage states, i.e., P-type and Z-type. The compressive strength test, contact angle test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques were performed to analyze them. The experimental results showed that adding CH3-NS increased the fluidity of the UWC. When too much CH3-NS was added, the antiwashout resistance was reduced The CH3-NS doping should not exceed 3.0%. For P-type specimens, adding uncalcined CH3-NS improved the strength of the reinforced specimens compared to calcined CH3-NS, the value was 17.9%. And the peak and ultimate stresses of the specimens were shifted forward by 18.1 and 4.8%, respectively. The polar force component magnitude of the surface tension of the specimen was the major factor affecting the surface free energy of P-type specimens. Different CH3-NS statuses and the properties of specimens were the major factors affecting the surface free energy of Z-type specimens. Contact angle measurements, FTIR, and SEM showed that uncalcined CH3-NS enhanced the hydrophobicity and reduced the surface free energy while increasing the density of UWC and thus enhancing its compressive strength. [ABSTRACT FROM AUTHOR]

Published
2023
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17. Analysis and optimization of seismic performance of high-rise residential building

Author

Wang, Na, Chang, Xuemin, Kong, Fanna, Shen, Yongkang, Wang, Na, Chang, Xuemin, Kong, Fanna, and Shen, Yongkang

Abstract

In order to improve the seismic performance of high-rise buildings, a friction damper installation scheme was proposed in the paper. Through numerical simulation and experimental testing, the vibration reduction effect was compared and verified. Herringbone structure was applied to install friction damper in the bearing wall. Based on this vibration reduction scheme, the finite element model of high-rise building was established, and the influence of damper on the modal characteristics of building frame was analyzed. It can be known that the damper has little influence on the natural frequency, but has a great influence on the amplitude range of the excitation response. In the finite element model, two kinds of seismic waves were applied, the strength and dynamic response was simulated and calculated, and the maximum deformation and stress results were obtained. Compared with the initial model, it can be known that the more intense the vibration is, the more obvious the damping effect of the damper is. A seismic excitation simulation system based on acceleration sensor detection is designed and applied to the wall vibration test. The results show that the maximum vibration acceleration of the measured point is reduced by 26.3 % by the damper, and the stable seismic effect can still be maintained during the impact of extension. Compared with the traditional hardness and volume reinforcement scheme, the friction damper can reduce the production cost and improve the adaptability to seismic wave excitation, which provides an important basis for seismic research in other fields.

Published
2022

20. Experimental Study on Compressing and Insulation Performance of Recycled Fiber Concrete

Author

Zhang Zengli, Shen Yongkang, and Yang Huan

Subjects
History, Computer Science Applications, Education
Abstract

In order to study and explore the related changes of crack resistance, compressive strength and thermal insulation performance of recycled fiber concrete blocks with polyester fiber as the main component. The test blocks were designed and manufactured in the laboratory, three kinds of concrete test blocks with different specifications were obtained after curing for 28 days. Through experiments, three kinds of test blocks with different specifications were tested for thermal insulation performance, crack resistance and compressive strength. With the help of the electronic universal testing machine controlled by microcomputer, relevant data are obtained. The results show that the fiber concrete with polyester fiber as the main component has good crack resistance and thermal insulation performance, which can prevent new cracks and delay the development of cracks in matrix materials to a certain extent. In addition, waste clothes are used as raw materials for research to solves the problems of cost and environmental pollution of traditional fiber concrete, and reduces the pollution of traditional waste clothes treatment. Waste fabric is also a form of waste of social resources. Therefore, rational utilization of this potential huge resource is the inevitable requirement of a conservation-oriented society and a low-carbon life, and the only way for sustainable development.

Published
2022

23. Bearing Capability for Mirco-Pile with Concrete-Filled Steel Tubular Reinforced Building Foundation

Author

Zhong Weiqiu, Shen Yongkang, Guotong Qu, and Li Wuxu

Subjects
Engineering, Bearing (mechanical), law, business.industry, Foundation (engineering), Geotechnical engineering, business, Pile, law.invention
Abstract

In general, the bearing capability is strength capability for mirco-pile. The stability bearing capability for mirco-pile with concrete-filled steel tubular becomes important in reinforced building foundation. The theory of buckling stability is applied to study the bearing capability of mirco-pile. According to the character of concrete filled steel tubular, the Euler force and the friction between pile and soil are combined for the buckling bearing capability of mirco-pile with concrete-filled steel tubular. The equation of mirco-pile with concrete-filled steel tubular is confirmed by some test data and numerical simulation. The slenderness ratio and material strength took great effects on the bearing capability of mirco-pile with concrete filled steel tubular. The equation on bearing capability mirco-pile with concrete filled steel tubular is applied for reinforce building foundation and referred to other application of concrete filled steel tubular.

Published
2021

24. Seismic Performance Evaluation on Eccentrically Brace Steel Frame by Capacity Spectrum Method

Author

Shen Yongkang and Wang Zheng-zhong

Subjects
Engineering, Capacity spectrum method, business.industry, Seismic loading, General Medicine, Structural engineering, Brace, Displacement (vector), Seismic analysis, Steel frame, Geotechnical engineering, business, Ductility, Intensity (heat transfer)
Abstract

According to the seismic demand spectra form the code for seismic design of buildings, seismic performances of eccentrically braced steel frames (EBF) in frequently, fortification and seldom occurred different intensity earthquakes were evaluated by the Capacity Spectrum Method (CSM). The capacity curves derived from base force-top displacement curves of structures subjected to the lateral seismic load of seismic codes were obtained from pushover analysis by applying sap2000 software and transformed to the spectrum curves, seismic performance were evaluated according to the intersection between the seismic demand spectra and the capacity spectrum. Seismic performances of 15 EBFs designed according to the Chinese design codes were evaluated by CSM. The certain ductility and displacement capacity of EBF in accordance with the China corresponding design codes are shown and some reference is suggested.

Published
2012

26. Feedback Control of Grazing-Induced Chaos in the Single-Degree-of-Freedom Impact Oscillator

Author

Shen, Yongkang, Yin, Shan, Wen, Guilin, and Xu, Huidong

Abstract

Based on the special dynamical property of continuous transition at certain degenerate grazing points in the single-degree-of-freedom impact oscillator, the control problem of the grazing-induced chaos is investigated in this paper. To design degenerate grazing bifurcations, we show how to obtain the degenerate grazing points of the 1/n impact periodic motions by the existence and stability analysis first. Then, a discrete-in-time feedback control strategy is used to suppress the grazing-induced chaos into the 1/n impact periodic motions precisely by the desired degenerate grazing bifurcation. The feasibility of the control strategy is verified by numerical simulations.

Published
2018
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