عنوان مقاله [English]
نویسندگان [English]چکیده [English]
According to non-existence of accurate inspection tools on various steps of design and construction of buildings in the past, also due to any change in function of some structures and finally of seismic activities of residential regions of the country, vulnerability assessment of existing structures is necessary. Evaluation of vulnerability of the structures is classified in two categories, quantitative and quantitative methods. In qualitative methods, the vulnerability of the structures is investigated exactly and in details. In this paper a quantitative method based on Japanese structural code is used to evaluate the vulnerability of a few concrete buildings in Urmia city. In this method, two parameters named structural seismic capacity index Is and lateral load capacity index q are introduced for each story. Then, by determining limitation for these two parameters the vulnerability of the buildings can be assessed.