Entity

Time filter

Source Type


Wang D.-Y.,Guangzhou University | Zhou Y.,Guangzhou University | Tan P.,Earthquake Engineering Research and Test Center
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2011

This paper investigated resistance characteristics and spatial wind-pressure distribution characteristics of three-dimensional rectangular bluff body by large eddy simulation (LES). Both mean and fluctuating wind velocity were calculated and adopted as inlet boundary condition to improve accuracy and credibility of numerical simulation. Pressure distributions and vertical and lateral velocity profiles of different models were then investigated and assessed separately in detail. Results show that wind profiles of weak regions are influenced mostly. Influence intensity of flow around bluff bodies shows a gradual decrease from the middle to both sides. Stable mean pressure coefficients can be observed on the front faces. Asymmetric eddy generation and separation in weak regions will have significant influence on the flow impact, separation, and reattachment of both sides of bluff body. The weak regions have the least influence areas in cases of α=45° or α=135°, and then increase gradually when is closing to α=0°, α=90° and α=180°. Source


Wei J.,Earthquake Engineering Research and Test Center | Tan P.,Earthquake Engineering Research and Test Center | Kuang Z.,Earthquake Engineering Research and Test Center | Zhou F.,Earthquake Engineering Research and Test Center
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

This paper presents elastoplastic time history analysis of a high-rise prefabricated structure with inter-story isolation system. A fiber model for a real high-rise prefabricated structure was developed using PERFORM 3D, and the nonlinearity of isolation system, superstructure and substructure are taken into consideration. In order to investigate the seismic performance of the high-rise prefabricated structure under rare earthquakes, incremental dynamic analysis (IDA) is carried out for various ground motions. Seismic responses of the high-rise prefabricated structure with inter-story isolation system were analyzed. Furthermore, damage mechanism and failure mode of the inter-story isolation structure is studied, which is helpful for promoting the development of the high-rise inter-story isolation technology. Source


Chen Y.,Earthquake Engineering Research and Test Center | Tan P.,Earthquake Engineering Research and Test Center | Heisha W.,Earthquake Engineering Research and Test Center | Zhou F.,Earthquake Engineering Research and Test Center
Journal of Earthquake Engineering and Engineering Vibration | Year: 2013

Based on the theory of continuous beam with distributed parameters and with boundary condiction of concentrated parameter, a solving procedure for time-history responses of single column and mass (SCM) systems used to seismic isolated regular bridge is developed. The equivalent foundation spring and the deformation compatibility conditions of the isolation layer at the column top are introduced to the governing equations. The real modes are given analytically, and the frequencies are calculated by the newton method. To handle the coupling effect of non-proportional damping problem, the additional damping of the seismic isolation layer is redistributed to each real mode and thus the system real modal decoupling is derived approximately. Then the mode superposition method can be introduced for solving the time-history response. Finally, the present procedure is applied to study the seismic response of SCM system used to a seismic isolated regular bridge. The comparison with numerical result by the finite element method shows the effectivity of the present method. The solutions also make clear that the structural response can be significantly reduced. Therefore, the seismic isolation strategy at pier top for SCM system shows considerable seismic reduction effectiveness. Source


Chen Y.,Earthquake Engineering Research and Test Center | Tan P.,Earthquake Engineering Research and Test Center | Chen J.,Earthquake Engineering Research and Test Center | Li W.,Earthquake Engineering Research and Test Center | Zhou F.,Earthquake Engineering Research and Test Center
Journal of Earthquake Engineering and Engineering Vibration | Year: 2013

A technical approach of vibration isolating barrier by polyurethane fast injecting technique is presented in this paper. Based on references for controllable density and stiffness , elastic-plasticity , rapid taking shape , waterproofing durabilityandsafety thevibrationisolatingbariercanbedesigned. Thedirectionalfracturinggrouting method and the curtain grouting method can be developed and adopted to build underground continuous polymer barrier to achieve effective vibration isolation. Under the guideline of the present scheme , test and contrast analysis iscompleted. Testresultshowsthatthevibrationisolatingbarierbyfracturinggroutingconstructiont echnologycan make the peak value of response velocity reduce in three directions , by 31% , 56% and 35% respectively. Preliminary experiment basis thus is provided for feasibility of vibration isolating barrier by polymer grouting technology. And the preliminary foundation for further the oretical research and analysis is laid. Source

Discover hidden collaborations