Blast Mitigation of Masonry Walls by Various Retrofit Technologies

Masonry buildings exhibit the vulnerability of poor blast-resistant capacity with little ductility. Aiming to find effective strengthening solutions to enhance masonry walls against explosion, this roject focused on studying the performance of retrofitting techniques, such as EB FRP and NSM FRP. However, the performance of the EB and NSM strips retrofits on masonry walls against blast loading is poor. This research shows that, such retrofits failed in shear or bending between strips. Hence, several other new materials, such as spray-on polyurea and aluminium foam, were also studied for mitigation of blast effect. To increase ductility of the wall, a new technique known as spray-on polyurea was employed. It was found that the capability of absorbing stain energy was the key factor that influenced performance of blast mitigation. A new energy absorbing material, aluminium foam, was applied to the masonry walls. To investigate the effectiveness of different types of retrofitting materials, debonding failure level and wall failure level were identified and then extended to greater range of pressure and impulse relationship.

Autorentext

Mr. Yu Su is a Ph.D. candidate in the School of Civil, Environmental & Mining Engineering at the University of Adelaide. He has been studying the weapon effects on masonry and concrete material by using the finite element analysis for over four years since he commenced his Master of Engineering Science degree at the university in 2006.