Performance Evaluation of a Vertically Irregular RC Building

Abstract eng:
The earthquake performance of a vertically irregular existing building, which has been retrofitted afterwards, is investigated herein this study. This type of irregularity, which is due to non-coinciding longitudinal axes of the columns on the periphery and only corner columns for two neighboring stories, generally exists between the ground and the first floors. A six-story reinforced concrete (RC) building with structural materials of C20 class concrete and S420 class reinforcing steel, which was designed considering the Turkish Earthquake Resistant Design Code 1975 (TERDC-1975) regulations, has the mentioned type of irregularity with console length and console depth of 1.25m each. The building has four and three spans at x-x and y-y directions, respectively. Story heights are same and equal to 3.0m. The 3D model of the structural system is used for numerical solutions by the use of SAP2000 and ZEUS-NL softwares. Pushover analyses are carried out for each of the x-x and y-y directions and capacity spectrum method, which is based on static pushover analysis, is used to obtain the performance levels of the existing structural systems. The strengthened system is analyzed similarly and performance evaluation is realized, based on the demand and capacity curves. Furthermore, comparisons are carried out and discussed in details.

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