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Wang D.,China Earthquake Disaster Prevention Center
Applied Mechanics and Materials | Year: 2013

Earthquake damage prediction is a fundamental topic for working out the urban earthquake disaster prevention planning, improving earthquake emergency plans and preparedness, establishing seismic fortification criterion, and achieving the goal of earthquake preparedness and disaster reduction. It's significant to carry out urban seismic damage prediction. To display and apply the results of damage prediction more scientifically, intuitively, integrally, objectively and fully, the technical methods and ideas of using virtual simulation technology are proposed and studied, and the system requirements, functional design and structural framework are also described in this paper. These studies will provide effective technical support for the damage prediction to serve the urban disaster reduction, improvement of people's awareness of disaster prevention and refuge and so on, and have good application prospects. © (2013) Trans Tech Publications, Switzerland. Source


Zhang Y.-S.,China Earthquake Disaster Prevention Center
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

For the two-dimensional scattering problem of plane SH waves in alluvial valley with a circular-arc section, some researchers proposed a type of closed-form analytical solution, which reduced the scattering problem into the solution of an infinite-dimensional algebraic equation system. The high incident frequency will cause the system coefficient matrix to be ill-conditioned, which limits the usable frequency band of the analytical solution. Here, the method of this solution is followed, however, in the solving procedure, the solution of linear equation system is avoided by selecting coordinate system, with the undetermined coefficients of scattering wave functions possessing definite analytical expressions. As a result, the analytical solution to this scattering problem is presented in a very broad frequency band, and the influence of the properties of the incident wave as well as the valley on the ground motion is discussed. Source


Wang D.,China Earthquake Disaster Prevention Center
Journal of Natural Disasters | Year: 2012

Earthquake disaster has the characteristics of abruptness, hard to predict, wide range and great losses etc. After the occurrence of earthquake, a series of relief efforts and measures, including urgent rescue, emergency wrecking, victims settlement and restoration and reconstruction, etc., need to be carried out and developed immediately, the precondition of which are fast, systematic, and objective investigations and evaluations to the earthquake disasters. Hence, a professional earthquake disaster estimation group with efficiency and capability is necessary, and construction of a network-based earthquake disaster estimation and investigation training system platform is urgently in need. The network domain name of China's earthquake disaster losses investigation and training system (CEDLIATS) is http://www. cedliats. cn, whose functions are as follows; (1) Registration, classification management and online exchanges for workers of earthquake disaster losses investigation; (2) Providing remote training service, including knowledge propaganda, test paper answers, situation deduction, synthetic simulation maneuvers, and many kinds of training modes that can automaticly evaluate training effectiveness; (3) Promoting the data of disaster loss investigation and evaluation report, backup, and share timely; (4) Establishing the linkage system of front and back land during earthquakes, realizing the task decomposition and seamless splice, and effectively improving the whole speed and quality of disaster evaluation. In a word, the efficiency and level of national earthquake disaster estimation and investigation is expected to overall promoted after the system's running. Source


Du P.,China Earthquake Administration | Tan X.,Guangzhou University | Wang D.,China Earthquake Disaster Prevention Center
Journal of Earthquake Engineering and Engineering Vibration | Year: 2014

The point of taking culvert as the vulnerability analysis unit of traffic system, just as road section, bridge, tunnel, etc. is put forward, which considers that the seismic damage impact factors are involved in the traffic system of network connectivity analysis. In order to establish the culvert group vulnerability analysis method, through investigating and counting up the damage to culvert sample located in Longnan Highway after the great Wenchuan earthquake in Sichuan Province of China, the vulnerable parts and performance of culvert in the context of a particular seismic geological disasters can be summarized. The disaster's reason has been analysed, and the damage factors have been obtained. Comparing with the data of culverts in Tangshan earthquake, the damage level division is made, that will lay the foundation of deriving seismic vulnerability formula of highway culvert group at the next step. Source


Zhang Y.-S.,China Earthquake Disaster Prevention Center
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2010

By the method of Fourier-Bessel series expansion of wave functions, the paper presents an analytical solution to the two-dimension stationary dynamic response of alluvial valley containing arbitrary number of circular-arc-shaped layers, excited by incident Rayleigh waves. And not only the convergence of the proposed series-form analytical solution with the truncation number of series terms is analyzed, but also the influence of the number of the terms of the finite Fourier series which determine the free-field displacement and stress of the incident Rayleigh wave, as well as that of the radius of the big arc which simulates approximately the flat half-space surface, on the solution is discussed. The results show that the proposed analytical solution can converge in a very broad frequency band. At last, by the proposed solution, the layering effects of the deposit in the valley, such as the number of alluvial layers, the existence of soft interlayer and its thickness, etc., on the ground motion are investigated in a broad frequency band. Source

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