ABSTRACT
For these accelerograms the following parameters whose definitions are provided in the literature (Meskouris 2000), have been evaluated: peak ground acceleration (PGA), Arias intensity IA (Arias 1970), root mean square acceleration (RMS), power P0.9, spectral intensity after Housner SIH (Housner 1952), seismic input energy Einp and strong motion duration after Trifunac/Brady SMDTB. The Arias intensity is a measure of the seismic energy content. The RMS is the square root of the mean squared acceleration. The P0.9
1 INTRODUCTION
Steel frame structures with infill wall sub-frames are a rather common type of building type extensively utilized where speed of construction is of the essence. Infill walls, depending on the architectural considerations, cover the whole or part of one or more of the steel sub-frames. Usually, when engineers study the structural characteristics of a frame structure chose to ignore the effect of infill walls taking only under consideration the extra weight they contribute in the load system without incorporating the structural stiffness that comes with such utilization. On the other hand, from site surveys and both analytical and experimental analysis results, it is widely acknowledged that infill walls contribute in the seismic response of the structure. The reasons are related with the contribution of infill walls in the overall building structural stiffness, the structure’s eigenperiod and damping effect. In this paper the numerical relationship between infill wall existence in a steel frame and the overall structural response in case of seismic loading is investigated.
