09 فروردین 1403
محمد واقفي

محمد واقفی

مرتبه علمی: دانشیار
نشانی: دانشکده مهندسی - گروه مهندسی عمران
تحصیلات: دکترای تخصصی / مهندسی عمران
تلفن: 077-31342401
دانشکده: دانشکده مهندسی

مشخصات پژوهش

عنوان
تاثیر کمانش میلگرد بر شاخص خرابی دیوار برشی بتن مسلح
نوع پژوهش مقالات در همایش ها
کلیدواژه‌ها
Buckling of bar, damage index, shear wall, nonlinear analysis
پژوهشگران سیدشاکر هاشمی (نفر اول) ، افسانه یزدانپناهی (نفر دوم) ، محمد واقفی (نفر سوم)

چکیده

Damage in a reinforced concrete member is a process due to loading. In case of load increase, this process accelerates and leads to member destruction. Damage assessment in the reinforced concrete members such as shear walls is of great importance. Damage index represents the structural damage. Besides, the structural damage or complete demolition in a member is a result of different factors such as concrete fracture, damage of reinforcing bars or continuity between concrete and reinforcing bars. A simplifying assumption in the modeling and non-linear analysis of shear walls is to assume that longitudinal bars will not buckle between two transversal reinforcements or ties. As a matter of fact, when the longitudinal bar under compression inclines to buckle and in the other hand this behavior is not considered in numerical modeling, this assumption will lead to a considerable difference between the analytical and experimental results. In this research, by means of calculating the damage index and considering buckling effect of longitudinal reinforcement related to transversal reinforcements, the non-linear behavior of shear walls assessed. The buckling effect of longitudinal reinforcements applied in stress-strain curve and the model of Park-Ang is used to estimate damage index in reinforced shear walls. The numerical results show that considering the buckling effect leads to a considerable difference in the damage index and the structure reaches its destruction limit sooner but more effect of buckling for large damage indices (DPA>=2) can be seen.