Determination of the performance level of a residential building based on reinforced concrete walls and designed according to Chilean codes

Abstract

The performance level of a residential building based on reinforced concrete walls was determined. The building was designed according with the current Chilean regulations (DS60, 2011, DS61, 2011). To determine the performance level, the Capacity Spectrum Method CSM was used, which superimposes the capacity and the seismic demand spectra. Capacity spectrum is built from the structural capacity curve of the building, which is obtained by performing a nonlinear static analysis (pushover). To use this tool, nonlinear properties of the materials must be incorporated in the wall elements using constitutive laws (stress-strain relationships). For the pushover analysis, three load patterns were considered. The seismic demand spectra considered in this study was obtained from design seismic movements proposed by Lagos et al. (2012) based on studies of seismic risk in Chilean buildings. Also two ways for the determination of the elastic displacement spectrum were considered: the one provided by the DS61 (2011) and that provided by ATC and FEMA. Different parameters such as displacement and shear by story and stresses in the walls were determined from the performance points obtained. In order to compare the results obtained in this research with those proposed by Vision 2000, the target displacement (ratio between roof displacement and height of the building) was calculated. As a conclusion, for all determined performance points of the building, the objective displacement does not exceed the limits established by Vision 2000. Also the performance level of the building, for all cases considered, does not exceed the operational level, which coincides with the Chilean experience, according to Lagos et al. (2012).