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RISS 인기검색어
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- 저자 : Chengxun (검색결과 6 건)
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Dynamic responses of a freestanding bridge tower under wave and wave-current loads
Chengxun Wei,Wenjing Wang,Daocheng Zhou 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.4
A model experiment with a scale of 1:150 has been conducted to investigate the dynamic responses of a freestanding four-column bridge tower subjected to regular wave, random wave and coupled wave-current actions. The base shear forces of the caisson foundation and the dynamic behaviors of the superstructure were measured and analyzed. The comparisons of the test values with the theoretical values shows that wave-induced base shear forces on the bridge caisson foundation can be approximated by using a wave force calculation method in which the structure is assumed to be fixed and rigid. Although the mean square errors of the base shear forces excited by joint random wave and current actions are approximately equal to those excited by pure random waves, the existence of a forward current increases the forward base shear forces and decreases the backward base shear forces. The tower top displacements excited by wave-currents are similar to those excited by waves, suggesting that a current does not significantly affect the dynamic responses of the superstructure of the bridge tower. The experiment results can be used as a reference for similar engineering design.
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Model test method for dynamic responses of bridge towers subjected to waves
Chengxun Wei,Songze Yu,Jiang Du,Wenjing Wang 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.6
In order to establish a dynamic model test method of bridge pylons subjected to ocean waves, the similarity method of hydroelastic model test for bridge pylons were analyzed systematically, and a model design and production method was proposed. Using this method, a dynamic test model of a bridge pylon was made, and then a free vibration test on the model structure and a dynamic response test of the model structure under wave actions were conducted in a wave flume. The results of the free vibration test show that the primary natural frequencies of the structure by the model test are close to the design frequencies of the prototype structure, indicating that the dynamic characteristics of the bridge pylon are well simulated by the model structure. The results of the dynamic response test show that wave induced base shear forces and motion responses on the model structure are consistent with the numerical results of the prototype structure. The model test results confirm that the proposed model test design method is feasible and applicable. It has application and reference significances for model testing studies of such marine bridge structures.
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Research Progress of Antibiotic Pollution and Adsorption Materials in Aquatic environment
Zheng, Kun,Deng, ChengXun,Deng, Xu,Yu, ZhiMin Urban Science Institute 2019 도시과학 Vol.8 No.2
China is the great powers of use and production of antibiotics.The current process of sewage treatment plants can not effectively remove antibiotics in water. Chinese scholars have detected different kinds of antibiotics in major waters of the country, which have potential harm to human body. Among all kinds of antibiotic treatment technologies, adsorption removal technology has the advantages of simple operation, low cost and high removal efficiency. It is a widely concerned antibiotic removal technology. However, at present, few materials have been put into practical application, and more materials with low cost and high efficiency need to be found. Different adsorptive materials have different adsorptivity to different antibiotics. For different antibiotics, different adsorptive materials can be integrated in the future, and the theory can be extended to application.
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Application and Development of Activated Carbon Adsorption in Wastewater
Zhang, DianYa,Deng, ChengXun,Deng, Xu,Yu, ZhiMin Urban Science Institute 2019 도시과학 Vol.8 No.2
With the continuous progress of modern science and technology and the rapid development of economy, with the continuous development of society, the treatment of industrial and domestic sewage has become a hot concern. Toxic substances and non-degradable pollutants in wastewater also have a great impact on the environment. This paper mainly expounds the current environmental situation and the adsorption mechanism of activated carbon. And the application and development of activated carbon adsorption in wastewater.
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Frequency analysis of a tower-cable coupled system
Moo Yeol Park,김석현,백인수,Chengxun Cui 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6
This study considers the prediction of natural frequency to avoid resonance in a wind turbine tower- cable coupled system. An analytical model based on the Rayleigh-Ritz method is proposed to predict the resonance frequency of a wind turbine tower structure supported by four guy cables. To verify the validity of the analytical model, a small tower-cable model is manufactured and tested. The frequency and mode data of the tower model are obtained by modal testing and finite element analysis. The validity of the proposed method is verified through the comparison of the frequency analysis results. Finally, using a parametric study with the analytical model, we identified how the cable tension and cable angle affect the resonance frequency of the wind turbine tower structure. From the analysis results, the tension limit and optimal angle of the cable are identified.
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