ABSTRACT
Due to the low design bearing capacity, large explosion impact surface and poor flexural tensile performance of masonry structure, brittle fracture failure is easy to occur under explosion impact load. For the purpose of anti explosion protection transformation of existing walls, the numerical simulation method is used to study the unreinforced and masonry sandwich steel plate concrete composite reinforced infilled walls, and the dynamic responses of the two walls under explosion impact are qualitatively analyzed and compared. The results show that the protective effect of steel plate sandwich blast-wall is related to the core material. The higher the strength of steel plate and the greater the thickness, the better the protective effect; Compared with reinforced concrete reinforced masonry wall, steel plate sandwich masonry wall has better explosion resistance; When the steel plate thickness of the steel plate sandwich blast-wall is less than 20mm, the maximum plastic displacement of the wall is greater than 0.015m; when the steel plate thickness is greater than 30mm, the maximum plastic displacement of the wall is less than 0.008m; When the thickness of steel plate is less than 10mm, the central speed of explosion point is greater than 58m/s; when the thickness of steel plate is greater than 30mm, the central speed of explosion point is less than 30m/s; Due to the improvement of ductility by sandwich steel plate, the damage of steel plate sandwich masonry wall is obviously better than that of reinforced concrete reinforced masonry wall.
