Increase of In-Plane Compressive Forces Due to Inertia in Wall Panels Subjected to Air Blast Loading (Oekning av Normalkrafter P G A Masstroeghet i Vaeggar Utsatta foer Luftstoetvagsvelastning)

摘要

If a load bearing wall in a building is subjected to a lateral dynamic load the in-plane compressive forces and thus the resistance will increase due to inertia from the mass of storeys above the wall. Consequently it is appropriate to introduce a dynamic resistance function that will vary with the intensity of the dynamic load. The procedure has been theoretically simulated and dynamic resistance functions of load bearing brick masonry walls with different strength and mass load have been calculated. Isodamage curves concerning walls with dynamic resistance functions are presented and compared to traditionally representation. If the response time of a structure loaded by the blast wave from an explosion is considerably longer than the duration of the positive (overpressure) loading phase, which is the case for many load bearing walls in ordinary dwelling houses subjected to explosions from conventional weapons, the negative (underpressure) loading phase will restrain the deflection and needs to be considered.