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Wind-induced vibration control of Hefei TV tower
with fluid viscous damper
Zhiqiang ZHANG , Aiqun LI , Jianping HE , Jianlei WANG ,
Front. Struct. Civ. Eng.. 2009, 3 (3): 249-254.
https://doi.org/10.1007/s11709-009-0038-x
The Hefei TV tower is taken as an analytical case to examine the control method with a fluid viscous damper under wind load fluctuation. Firstly, according to the random vibration theory, the effect of fluctuating wind on the tower can be modeled as a 19-dimensional correlated random process, and the wind-induced vibration analysis of the tower subjected to dynamic wind load was further obtained. On the basis of the others’ works, a bi-model dynamic model is proposed. Finally, a dynamic model is proposed to study the wind-induced vibration control analysis using viscous fluid dampers, and the optimal damping coefficient is obtained regarding the wind-induced response of the upper turret as optimization objectives. Analysis results show that the maximum peak response of the tower under dynamic wind load is far beyond the allowable range of the code. The wind-induced responses and the wind vibration input energy of the tower are decreased greatly by using a fluid viscous damper, and the peak acceleration responses of the upper turret is reduced by 43.4%.
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Experiment and calculation on seismic behavior
of RC composite core walls with concealed steel truss
Wanlin CAO , Weihua CHANG , Changjun ZHAO , Jianwei ZHANG ,
Front. Struct. Civ. Eng.. 2009, 3 (3): 255-261.
https://doi.org/10.1007/s11709-009-0043-0
To improve the seismic performance of reinforced concrete core walls, reinforced concrete composite core walls with concealed steel truss were proposed and systemically investigated. Two 1/6 scale core wall specimens, including a normal reinforced concrete core wall and a reinforced concrete composite core wall with concealed steel truss, were designed. The experimental study on seismic performance under cyclic loading was carried out. The load-carrying capacity, stiffness, ductility, hysteretic behavior and energy dissipation of the core walls were discussed. The test results showed that the seismic performance of core walls is improved greatly by the concealed steel truss. The calculated results were found to agree well with the actual measured ones.
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Probabilistic model for vessel-bridge collisions
in the Three Gorges Reservoir
Bo GENG , Hong WANG , Junjie WANG ,
Front. Struct. Civ. Eng.. 2009, 3 (3): 279-285.
https://doi.org/10.1007/s11709-009-0044-z
Based on a field observation on vessel transit path of three bridges over the Yangtze River in the Three Gorges Reservoir, and an analysis of the geometric probabilistic model of transiting vessels in collision probability calculation, the aberrancy angle and vessel velocity probabilistic model related with impact force, a probabilistic model is established and also verified by goodness-of-fit test. The vessel transit path distribution can be expressed by the normal distribution model. For the Three Gorges Reservoir, the mean and standard deviation adopt 0.2w and 0.1w, respectively (w is the channel width). The aberrancy angle distribution of vessels accepts maximum I distribution model, and its distribution parameters can be taken as 0.314 and 4.354. The velocity distribution of up-bound and down-bound vessels can also be expressed by the normal distribution model.
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Dynamics simulation of bottom high-sediment sea
water movement under waves
Xueyi YOU , Wei LIU , Houpeng XIAO ,
Front. Struct. Civ. Eng.. 2009, 3 (3): 312-315.
https://doi.org/10.1007/s11709-009-0037-y
The movement of bottom high-sediment sea water under water waves, especially that of the high-sediment water layer close to the sea bottom, is important to the resuspension and settlement of sediment. Supposing that the high-sediment sea water is a Newtonian fluid, based on Navier-Stokes (N-S) theory, the movement of the interfaces of air-water and water-sediment water was tracked by the volume of fluid (VOF) method. The velocity field of sediment water was simulated by considering the effect of water waves. The results show that the movement of sediment water is very different from that of sea water, which provides a solid basis for understanding the resuspension and settlement of sediment and the formation of bottom stripe, and the VOF method can trace the movement of the two interfaces simultaneously; the movement of the air-water interface has a strong effect on that of the water-sediment water interface, while the effect of the water-sediment water interface movement on the air-water interface is not obvious.
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Calculation of diagonal section and cross-section
bending capacity for strengthening RC structure using high-performance
ferrocement laminate
Shouping SHANG , Fangyuan ZHOU , Wei LIU ,
Front. Struct. Civ. Eng.. 2009, 3 (3): 330-338.
https://doi.org/10.1007/s11709-009-0046-x
Because there is a great demand of reinforcement and retrofitting of aged structures nationwide, as well as the rapid development of innovative building materials, the adoption of strengthening RC structures using new inorganic materials has become possible. High-performance ferrocement laminate (HPFL) is an effective method of strengthening concrete structure. High-performance ferrocement laminate is a new type of inorganic material with the advantages such as high strength, small contraction, good bonding properties, etc. This paper introduces the formula of cross-section bending capacity for strengthening concrete beams with HPEL. A comparative analysis of experimental data, as well as the calculation of diagonal section bearing capacity of concrete members, is given.
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15 articles
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