Modelling and analysis of a wall-frame structure according to EC8

In order to harmonize the standards for design of structures in Europe the family of Eurocode standards has been developed. Eurocode 8 (EC8) represents the standard for design of earthquake resistant structures. This standard has been translated and will soon be adopted as Slovenian standard SIST EN 1998-1. The application of this standard for analysis of a reinforced concrete frame-wall building was the main goal of this diploma work. We focused on chapters on structural analysis. The analyses were performed by the computer program ETABS. In the structural models prepared and analysed with ETABS we followed the EC8 requirements and used different methods included in the standard. The frame of the analyzed frame-wall building contributed more than 15% to building’s stiffness and according to that we cannot design the frame as a secondary seismic member. We also found out that the lateral force method of analysis is not appropriate for the investigated building because it gives very different results from the modal response spectrum analysis. The reason is in non-uniform distribution of stiffness between stories and in the effect of higher modes. It turned out that defining the torsional radius, secondary seismic members and torsional moments caused some problems. Other than that the part of EC8, applied in our work, seems to be quite clear and simple. Computer program ETABS, which was used for analyzing the building, proved to be contemporary and user-friendly