Seismic performance evaluation of dual reinforced concrete systems design according to Turkish seismic code, 2007

Abstract

The aim of this study is to investigate the dual reinforced concrete frame systems of mixed ductility level which are described in Turkish Seismic Code, 2007, (TSC '07) by using Nonlinear Static Analysis (Pushover Analysis) for evaluating the seismic performance of these reinforced concrete buildings. For this purpose, a sample reinforced concrete structure is used accordihg to Turkish Seismic Code, 2007, (2.5.4.1(c)), to evaluate the performance where the ratio of the sum of base shear developed at the bases of solid structural walls under seismic loads to the total base shear developed for the entire building is between the values 0.4 and 213 (0.4<as(2/3). The sample structure has six storey with one-way ribbed slab system having two shearwalls in both x- and y-direction of high ductility level and it is also symmetrical to both x- and y-axes. In the Nonlinear Static Analysis, modal load pattern procedure is used. The fundamental first mode is taken into account while evaluating the performance of the sample structure. Pushover Analysis including the capacity spectrum method (CSM) demonstrates how the building will behave when subjected to major earthquakes where it is assumed that the elastic capacity of the structure will be exceeded. By performing the Pushover Analysis, interstorey drift ratios, hinge rotations and curvatures are obtained. The strain values of hinges were calculated by using the curvatures and these strain values are compared with the limit strain values described in TSC '07 (7.6.9). Life safety (LS) structural performance level is chosen as a target for the model structure subjected to a design earthquake that may be exceeded within a period of 50 years with 10% probability. Comparing these values, the structure performance is evaluated and the results are shorn in the tables.