Numerical Simulation Of Reinforced Concrete Structure Collapsed High-rise Collapse Blasting

More and more buildings would be dismantled as the extension and reconstruction of city, which is a new chance for demolition blasting. Meanwhile the difficulty of demolition blasting has increased as the architecture structures become complicated and the space for collapse become narrow gradually. The development of demolition blasting face challenges, it not only meet requirements of collapse and disintegration, but also safety and environmental. As the theory behind practice, most design proposal of demolition blasting engineering were based on experience. Numerical simulation provided a new method for demolition blasting. The practicability of the plan of blasting can be forecasted and optimized by numerical simulation. Through the result of simulation, the collapse process and internal force status, which was the basis for treatment, can be obtained. Most RC models are integrated. Integrated model can not reflect the different failure process of steel and concrete and the error is larger in complex structure. In this paper, an common node separate model may be used to simulate the process of building collapse, the main content includes:(1) The research status of demolition blasting of buildings both at home and abroad are introduced.(2) The theoretical models of demolition blasting are summed up, including the failure of structure, movement of collapse, forward and blowback, touchdown vibration according to the process of collapse, and one of center of gravity instability model was established, which considered turning over. Most of these models did not considered impact failure and calculations were complex, so those models were difficult to apply to the practice of engineering.(3) The mechanism of common node separate model in demolition of blasting was analyzed. The different failure process of the steel and concrete materials under large eccentric compression were reflected well with common node separate model.(4) The common node separate modes were established for previous office building of Kunming municipal government and Zhuwangtuo hotel. These modes were used to simulate the process of collapse in demolition blasting by settting constraint, contact, and gravity.(5) The collapse of Kunming municipal government and Zhuwangtuo hote were analyzed and compared with practical situation by the simulated result.(6) Theinitial buckling process and destruction of the support column were analyzed based the simulated result.(7) The construction technique of micro-orientation blasting was introduced, and mechanism was analyzed by blowback model, compared the simulated result of Kunming municipal government and Zhuwangtuo hote, the effect of micro-orientation blasting were verified...