Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 1 1 2013 05 26 Prediction of Ultimate Shear Capacity of Reinforced Normal and High Strength Concrete Beams Without Stirrups Using Fuzzy Logic 75 81 EN Abdulkhaliq Abdulyimah Jaafer Civil Engineering Department, College of Engineering, Misan University, Misan, Iraq AJCEA2013142 10.12691/ajcea-1-4-2 2013 04 10 2013 05 25 2013 05 26 The main objective of the present study is to predict the ultimate shear capacity of reinforced concrete beams no contains web reinforcement. Fuzzy inference system (FIS) was developed to predict the shear strength of these beams using Mamadani method. Fuzzy inference system (FIS) model has been proved to be very effective in predicting the ultimate shear strength of concrete beams without stirrups. The regression analysis between the output of the FIS model and the corresponding target, R² = 0.9969 and 0.9509 for training and testing data, respectively. Based on FIS results, a parametric analysis was carried out to study the influence of each parameter affecting the shear strength of beams without stirrups and these results are compared with the provisions of ACI-code.