SEISMIC EVALUATION OF IRREGULAR REINFORCED CONCRETE STRUCTURES

Seismic evaluation of the behavior of irregular structures is one of the most important steps in the retrofitting process of such structures. Irregularity can be in the elevation or in the plan of a structure. Irregularity in plan shape which is due to the difference between the position of the center of stiffness and the mass center of a structure caused by architectural requirements is usually inevitable. In this study the analytical and experimental models of project CM-4 Structural Retrofit Strategies, part of the Mid-America Earthquake Center Core Research Program under the Thrust Area Consequence Minimization. tested at full scale at the European Laboratory for Structural Assessment (ELSA) of the Joint Research Center (JRC), Ispra, Italy are modeled in the general purpose ABAQUS. The analytical results of the models generated in ABAQUS compare favorably with the experimental and analytical results of the project. Having verified the reliability the accuracy of the adopted analysis methods the seismic behavior of an irregular reinforced concrete building designed according to the Iranian Code of Practice for Seismic Resistant Design of Buildings, Standard No. 2800 has been investigated using the model. The investigated parameters include the capacity of the building, the maximum displacement, the relative displacement of the stories and the dynamic characteristics of the building .

Keywords:

seismic evaluation , irregular structures , maximum displacement , relative displacement