مرکز منطقه ای اطلاع رساني علوم و فناوري - EFFECTS OF THE REBAR CORROSION TO STRUCTURAL SYSTEM BEHAVIOR OF FRAMES

Abstract :

In Turkey, reinforced concrete sections which are suffered corrosion of reinforcement because of inadequate concrete cover, bad material, damaging environmental actions etc. are frequently observed. Reduction in cross-section diameter of reinforcement, loss of bond stress, cracks in concrete, and changes in the mechanical properties of reinforcement are mainly results of corrosion. Negative results of the structural behavior of buildings which have located in earthquake zones should be investigated. The aim of this study is to examine the behavior of reinforced concrete building frame systems exposed to rebar corrosion and earthquake loads. Structural behavior of sound system (the system without corrosion) will be compared with respect to behavior of corroded system. Nonlinear analyses were performed on the sound frame system and on the frame systems exposed to different level of rebar corrosion. These analyses have occurred in two steps. In the first step (the section analysis), normal force-moment (N-M) interaction diagrams and moment-curvature (M-κ) diagrams of column and beam sections for each different corrosion level are drawn. In the second step (system analysis) static pushover analysis were performed for each different corrosion stituation, modal capacity curves were obtained and the target displacement were calculated for each corrosion level. In addition, damages of sections were examined. In analysis, such as ATC-40, FEMA-273, TEC-2007, national and international specifications were benefitted for analysis. According to the results of analysis; type, intensity and location of corrosion affect behavior of structural system negatively. During the seismic evaluation of existing buildings, consideration corrosion effects are suggested as versatile.