The main objective of this paper is to evaluate the seismic response of buildings of\ntypical reinforced concrete frames when concrete starts to deteriorate gradually and\nto make a comparison between the base shear and the displacement at different stages\nof earthquake loading. Typical 5, 15, 20 and 30-storey reinforced concrete frames\nhave been designed for seismicity according to the recently adopted seismic code in\nAbu Dhabi, ACI 318-08/IBC 2009 code. A pushover analysis has been performed to\nthese four buildings by using SAP 2000. Twenty-four models have been created (6\nmodels for each building) by decreasing the concrete strength gradually from 4000\npsi (281 kg/cm2) to 1500 psi (105 kg/cm2). This is to simulate the effect of harsh environment\non the strength of concrete in existing buildings.
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