Analysis of Building Structure Under Impact Load

The paper presents the analysis of progressive collapse in a building under impact load. The building with four-story frame structure and underground car park is taken into consideration. The car park structure consist of reinforced concrete columns. The above-ground part of the building consist of reinforced concrete slabs supported by steel columns. Two cases are considered: the impact of a car on a reinforced concrete columns of the car park, and the impact of the car on a steel columns on the ground floor. The computational analysis are carried out using two methods: equivalent static approach, and simplified dynamic approach according to EN 1991-1-7, Eurocode 1—Actions on structures—Part 1-7: General actions—Accidental actions, 2. Mitigation of the risk of progressive collapse in steel and composite building frames under exceptional events, D3-1: Design recommendations against progressive collapse in steel and steel-concrete buildings. In the equivalent static method the impact force is replaced with an equivalent static force, and internal forces in the structure are calculated using static analysis. In the dynamic approach, the structure is loaded with a dynamic force from the vehicle impact, and dynamic analysis is conducted using a linear-elastic material model. The calculation results include: values of internal forces, values of stress ratio, values of displacement at certain points (nodes) in the structure. Additionally, the paper presents the guidelines of designing buildings for the effects of vehicle impact included in EN 1991-1-7.