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Xiao Y.,Hunan University | Xiao Y.,University of Southern California | Ma J.,Zhejiang Prov Institute Of Architectural Design And Research
Construction and Building Materials | Year: 2012

A fire simulation experiment of a full-scale room unit model was carried out to study the fire safety of lightweight glue-laminated bamboo (glubam) frame buildings. Wooden crib with its quantity determined based on typical fire load intensity for residential buildings was stacked and ignited in the experimental room unit. The test was finished after 1 h. Temperature histories of several points on walls and upper floor slab, fire behavior of the over-all structure and the damage to the members were examined. Numerical simulation was conducted using fire-driven fluid dynamics software Fire Dynamics Simulator (FDS) developed by National Institute of Standards and Technology (NIST). The simulated results were compared with the experimental observations, demonstrating that the FDS is a useful tool to provide visual simulation of the experimental testing. Fire design measures using gypsum boards and rock wool insulation suggested for the new bamboo building are found adequate from this research. © 2012 Elsevier Ltd. All rights reserved.

Li Y.,Zhejiang Prov Institute Of Architectural Design And Research | Chen D.,Zhejiang Prov Institute Of Architectural Design And Research | Liu X.-W.,Zhejiang Prov Institute Of Architectural Design And Research | Zhu H.-Y.,Dongtong Geotechnical technology Ltd Company | Tang D.,Dongtong Geotechnical technology Ltd Company
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

The prestressed assemble steel support system (PASS) is an innovative retaining structure which can effectively increase the stiffness of connection joints between retaining piles and bracings. Compared with the traditional steel support, PASS can be used in larger and higher foundation pits. Basin excavation is proposed to solve the problem that the support system cannot be collided and compacted. The basic structure and principles of PASS are introduced firstly. Then a finished project in mucky soils is described in order to show the construction process of PASS. The monitoring results are also obtained, and unusual lateral displacement curves are found. It is proved by the back-analysis of monitoring data that the support stiffness much lower than the calculated one leads to the largest displacement at the top of retaining piles. The measures to ensure the full-strength connection in the joints are advised.

Hu K.,Zhejiang University | Zhao Y.,Zhejiang University | Wang Z.,Zhejiang University | Wang Z.,Zhejiang Prov Institute Of Architectural Design And Research
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Steel tanks are widely used for the storage of liquefied natural gas, petroleum and other flammable explosive substance. The detonation of these explosives generates high intensity shock wave within a short time, which will cause serious damage to storage tanks and bring catastrophic results. A rational evaluation of the explosion loading is the foundation for structure failure analysis and safety designing of tanks. A CFD model was built up based on turbulence model and eddy dissipation concept(EDC) combustion model by use of computational fluid dynamics software Fluent, which can simulate the changes of explosion flow field in tanks and obtain the overpressure time history at typical positions. Compared with TNT equivalent method, the result by CFD model is closer to the actual situation of flammable gas explosion in tanks. Furthermore, the influences of height-to-diameter ratio, concentration and species of flammable gas and initial pressure were taken into account. It is shown that, the gas reaction rate and explosion loading enhance along with the increase of height-to-diameter ratio, initial pressure and activity of flammable gas. Moreover, a stoichiometric concentration will also cause a higher explosion pressure and gas reaction rate. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

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