The Wind Destructible Structure Damage Assessment System And Application In Study Of Mitigation Of Wind-excited Hazard In Shantou City

The job of this thesis is part of the project named GIS-BASED EVALUATION AND DECISION SUPPORT SYSTEM FOR URBAN HAZARD RESISTANCE (59938180), which is sponsored by National Natural Science Foundation of China.Wind hazard is the one which has the widespread influence in the nature disaster, and hurricane hazard is the most devastative and disastrous one. The most destructible structure in the hurricane is the Wind Destructible Structure(WDS) which lacks study in the world.This thesis puts a kind of brand-new approach forward the research of WDS damage assessment and applies it in the study of mitigation of wind-excited hazard in Shantou. The application obtains satisfactory results.This thesis takes the outdoor bill-board as an example, on the basis of a large number of survey and study, sets up the mechanics model of typical WDS and the finite element model adopting Ansys, a kind of powerful finite element software. Seeing that structure characteristic of damage in the wind hazard, non-linear dynamics analysis was carried on, and has proposed the standard of damaging assessment. On this basis, neural network was used to assess the damage of WDS. A large number of samples calculate have been done utilizing FEA analyse. This offers learning samples to neural network method. The relation between the structure damage and the factors of causing disaster was set up. Adopting neural network method avoids carrying on complex analyse one by one to structure. It enhances the efficiency greatly and establishes the foundation for the automative assessment system further.For making the assessment method be used in reality, this thesis set up the Shantou's WDS spatial database after a large amount of survey. Based on basic GIS, applying the standard of WDS damaging assessment, the WDS damage assessment system of Shantou city has been built. The system can simulate the state of WDS's damage when hurricane lands on Shantou city and show the distributing complexion, and forecast,decrease,assess damage. The method that this thesis bring forward can be extended to the research of mitigation of wind-excited hazard for other type ofstructure.