Dynamic Response Of Masonry Infilled RC Frame Structures Subjected To Explosive And Impact Loads

Terrorism occurs frequently although nowadays peace and development are the mainstream of modern society. The explosion events occurs more frequently than other terrorist events. The terrorism have threaten the peace of the whole world, so it is the main factor of endanger the security of many countries. Besides explosion brought by the terrorism, there are other explosive accidents, such as explosion of gas, blast of industrial production. Research on the theory and the technology protecting the structure from the blast is a practical and urgent subject. The dynamic response analysis of structure under explosive and impact loads is an important field. Nowadays, the theory on resisting explosive load for structure is incomplete, so it needs further discussion and study.Dynamic response analysis for masonry infilled reinforced concrete frame structures under explosive load were investigated by numerical method in this paper. The numerical model was set up in a finite element software LS-DYNA. The minimum scaled distances required to prevent collapse and damage of the masonry infilled RC structures to airblast load are derived for numerical simulations. The present numerical results are compared with those obtained in a previous study and with the code specifications.In this paper, four cases with varying distance between the wall and the explosive are considered. Given the displacement response, plastic strain, Von Mises stress and displacement response time histories at the different moment. Some conclusions can be obtained as follows. A series of numerical calculations with a scaled distance increment are carried out to estimate structural response and damage to blast loads. Four levers of structural damage are defined. They are: collapse of the RC frame; collapse of the side masonry wall; collapse of the front masonry wall; and excessive damage. With the increase of the scaled distance and the same distance between explosive and structure, the peak pressure and the displacement of component reduced correspondingly.This paper established a model of masonry infilled reinforced concrete frame structure. The minimum scaled distances required to prevent collapse and damage of the masonry infilled RC structures to explosive load are derived for numerical simulations. These results can be used as the structure for protective design.