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Abstract
It has long been known that fire could dramatically reduce the characteristic strength of the reinforced concrete elements. A significant effort has been devoted to study the effect of fire on the reinforced concrete elements during past decades. Most of the previous studies were focused on evaluating for concrete elements and its fire resistance, and provided some recommendations of structural fire- resistance such as cover thickness, reinforcement ratio and coating materials. A lot of thesis focused on columns, beams and slabs exposed to fire, where less efforts aimed to study the effect of fire on beam column connections Consequently, the main objective of the present work is to study the behavior of reinforced concrete beam-column connections exposed to fire under loading and to evaluate the reduction in concrete strength during fire. To achieve these goals, this research is divided into two parts, the first part is experimental program, and the second is the theoretical analysis. The experimental program include 18 one- third scale specimens half of them casted from normal concrete and other half of SCC. For each concrete type, 3 specimens were exposed to 600 °C for one hour, other 3 specimens exposed to 600°C for two hours and last 3 specimens as a control not exposed to fire. The effect of some parameters on the connection’s behavior like reinforcement ratio, type of concrete (normal or SCC) , amount of stirrups on connection and exposure time were studied. Experimental program extended also to study heat distribution inside beam – column connections by measuring temperature at 65 point Distributors at 5 sections allover connection. Excellent behavior in fresh and hardened states of both normal concrete and SCC was observed for reinforced beam- column connections. SCC has good properties in hardening state when exposed to high temperature compared with normal concrete. Increasing reinforcement ratio and number of stirrups in connections increases its fire resistance Good agreement between analytical and experimental work was observed.