Equivalent loading due to airplaine impact taking into account the non-linearities of impacted reinforced concrete buildings

The object of the paper is to present a numerical method of determining the dynamic response at characteristic points of the building taking into account the non-linear behaviour of locally impacted cracked damaged concrete. The method is based on the determination of a verified load function (VLF) which, applied to a linear elastic model of the structure, leads to the same response of the building (far from the impact point) as that due to the RLF impact force applied to a more realistic non-linear model of the reinforced concrete building. The practical advantage of using this procedure is that it avoids long and costly non-linear time integration of a full structural model. In order to obtain the VLF one only performs non-linear explicit calculations locally which include the main physical phenomenon occuring in an impacted reinforced concrete structure. (orig./HP)