SPECTRUM COMPATIBLE TIME HISTORY WITH FLING AND ITS EFFECTS ON STRUCTURE

Abstract

In order to study site specific vulnerability of structures against earthquakes, first and foremost requirement is determination of realistic ground motion. But most of the times recorded ground motion is not available and if it is available there is question regarding its repeatability. Hence it becomes necessary to generate an artificial time history. This problem is more complicated since a true representation of the earthquake ground motion requires careful consideration of different aspects of time histories. Fling is one of such important factor and needs to give consideration. Hence the objective of the work is to generate spectrum compatible time histories with and without flings and to study the effect of fling on structures. Two different methods to develop spectrum compatible time histories with and without fling but with same target response spectrum are presented. Six time histories which contains fling from Chi Chi earthquake (1999) are taken as reference to develop spectrum compatible time history with fling. Six time histories with fling and without fling but with same target response spectrum are developed by each method. Total twenty four time histories, twelve with fling and twelve without fling are developed. Six different types of the structures (Symmetric and Asymmetric) are considered for linear time history analysis and four different types of the structures (Symmetric and Asymmetric) are considered for the non linear time history analysis. Linear time history analysis is carried out by using software ETABS and Non linear time history analysis is performed by using software SAP. Finally, Base shear response, Column Moment response and Peak Storey Displacement response of the Structures are considered and compared for studying the effect of fling on the structures. Surprisingly, fling does not found to have any effect on the linear and non linear structural response.