Study On Automatic Modeling Method Of RC Frame Structures For Urban Seismic Damage Simulation

Earthquakes occur frequently in China by which a great deal of casualties and property losses are caused.From the experience of earthquake damage it is shown that the collapse of buildings is the most important factor to cause the casualties.With the rapid development of city in our country,a large population and wealth gathered in the city,which leads the city to become increasingly complex and fragile.As the main carrier of city seismic performance of building is vitally important to the seismic capacity of city.Therefore,measures should be taken to minimize the risk of earthquake disaster and to improve the defense capability of urban earthquake disaster in China.At present,numerical simulation has become an important tool for the analysis the seismic behavior of city buildings,especially in the lack of experience of earthquake damage area and can be used for seismic capacity assessment of the city,finding the weak link of the city,and providing the basis for the government to carry out the work of earthquake prevention and disaster reduction.It is one of the important challenges in earthquake damage simulation of urban building groups that how a large number of urban buildings are modeled and the destruction behavior of buildings simulated accurately under earthquakes.For each building structure it is certainly limited and difficult to attain the drawings and detailed information,and the process of establishing the model for numerical simulation and analysising of the calculation are cumbersome and complex,time-consuming and a lot of manpower,material and financial resources,not practical,difficult are required which is impactical.At present,in the city level modeling one by one is mainly based on the simplified store model,and by using GIS data model the city automatically.In order to overcome the lack of consideration of layer model structure factors of failure modes,damage details and injury mechanism,according to the city's most typical structure of reinforced concrete(RC)frame structure,the automatic fine fine fiber modeling method based on model structure is exploreding.The main work of this study includes:(1)Dynamic characteristics and typical damage of reinforced concrete structure under earthquakes are summarized.Different structural damage to the domestic and foreign simulation methods are compared and analyzed.The problems need to be solved in the current research are provided.(2)The fine modeling method of RC frame structure based on fine fiber model is established in which the program is implemented.In the condition of known structure stores,shape of roof and structural area,under is estimated by the structural vibration period experience formula the natural vibration period of the structure,using the dynamics theory and design method of building high-rise structure the structure layer stiffness and beam column size structure are solved obtained.Based on the requirements of the code,a simplified method for the reinforcement of the beam and column sections is proposed and the automatic design method from the limit building information to the reinforcement of each component is realized.(3)Using the technology of nonlinear finite element software MSC.MARC command and the parametric modeling method the automatic modeling procedure is given,and the elastic plastic analysis framework based on THUFIBER user subroutine is realized.(4)Three actual RC frame structures are selected,which are based on manual modeling of drawings and automatic modeling based on the proposed method.By comparing the structural self-vibration period and the inter-story displacement angle under earthquakes.The rationality and feasibility of the RC frame structure automation modeling method proposed in this paper are verified.