BEHAVIOR OF REINFORCED HIGH STRENGTH CONCRETE BEAM- COLUMN JOINT; PART II: NUMERICAL SIMULATION By Ahmad El-Nabawy Atta, Salah El-Din Fahmy Taher*, Abdel-Hakim A. Khalil and Salah El-Din El-Metwally Structural Engineering Department, Faculty of Engineering, Tanta University, Egypt. ABSTRACT Design provisions of many international codes for beam column joints is limited to ordinary strength concrete. The experimental work presented in Part I of the paper has indicated significant difference in behavior of normal concrete joints from those made of hybrid or monolithic high strength concrete joints. To conduct an extensive parametric study, nonlinear three-dimensional finite element analysis has been carried out for external reinforced concrete Type-1 joints under quasi-static monotonic loading. The computational model has been verified and validated against several experimental tests. The numerical work aimed at providing more insight about the behavior and determining the fundamental mechanisms of load transfer within the joint. The basic parameters included the effects of geometrical aspects as well as the reinforcement amounts and detailing in column, girder and joint. Also the strength parameters, existence of axial column load, presence of vertical haunches and the restraining effects by transverse elements have been considered in the analysis. The present study indicated that the modes of failure and shear behavior of high strength concrete connections behaved differently from normal strength concrete connections at various axial loading levels. KEYWORDS: Reinforced concrete, Beam-column joint, Connections, High strength concrete, Experimental, Nonlinear finite element. ___________________________ * Author to whom correspondence should be addressed at 23a Anas Ibn Malik St., Al-Mohandseen 12411, Giza, Egypt. E-mail: sftaher@yahoo.com.