Near-source ground motions effect on seismic reliability of reinforced concrete framed buildings

Near-source ground motions effect on seismic reliability of reinforced concrete framed buildings

… Download …


Part of #Near-source ground motions effect on seismic reliability of reinforced concrete framed buildings# :

Publishing year : 2011

Conference : 6th National Congress on Civil Engineering

Number of pages : 8

Abstract: Near-Source ground movements have characteristics like a pulse-like feature that makes them distinctive from ordinary records. This paper discusses the near-source ground motions effect on the seismic reliability of reinforced concrete framed buildings. Since there are significant uncertainties in the capacity of structural members and seismic excitations, reliability analysis can be an effective method for evaluating structural system's seismic performance. In this study, the reliability assessment is carried out by response analysis. Nonlinear dynamic analysis is used to evaluate structural seismic demands. Two sets of ordinary and near-source records are selected for focusing on the comparison of near-ground source motion effects with ordinary ones. A vector-valued intensity measure (IM) is adopted for applying ground motions, which takes into account the spectral shape. Four example buildings with different heights are analyzed using three-dimensional nonlinear time history method, and the capacity curves are obtained by incremental dynamic analysis (IDA). The P-Delta effect was considered in nonlinear analysis. In the case of lateral load resisting systems, the moment resisting frame system (MRF) and the dual system consisting of moment-resisting frames and shear walls, in the example buildings there were two different types of lateral load resisting systems . These approaches lead to a more general conclusion about the probability of failure of reinforced concrete framed buildings in near-source ground motions in comparison with ordinary ground motions. The results show that the added shear walls have a very small effect on the reliability of high-rise reinforced concrete framed buildings subjected to near-source ground movements, but the added shear walls are relatively more beneficial for low-rise buildings against near-source ground Motions