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The fatigue and fracture behaviour of high loaded bolted bar connectionmade of high strength steel S1100Q is presented. The material parameters for thefatigue crack initiation f’, f’, b and c are determined using low cycle fatigue testaccording to ASTM E 606 standard. The fracture mechanics parameters (the coefficientof Paris equation C and m) are determined according to ASTM E 647 standard. Basedon low cycle fatigue parameters the computational analysis is performed to determinethe number of stress cycles required for the fatigue crack initiation. The remain servicelife up to the final failure is than determined using the known parameters C and m andcalculated stress intensity factor, where 3D numerical analysis is performed. The boltedbars are also experimentally tested. Comparison of computational and experimentalresults shows a reasonable agreement.