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The paper describes the analysis of steel structure, supporting three bells in the belfry of St. Trinity Church in Krosno. The structure is dated from 1928 and has a form of riveted space truss, with slender members. The total mass of all bells, coming from the 17th century, is nearly equal to 4200 kilograms, so the dynamic forces coming from bells swinging are quite large. The paper describes specific problems associated with assessing the resistance of old steel structure, treated as a relic. The analysis covered technical condition assessment of the structure, evaluation of actions and environmental influences, mechanical parameters prediction of steel and rivets by non-destructive methods and also static and dynamic analysis of the structure. According to many years of exploitation, the fatigue verifications were also performed using the classification method.

RESISTANCE AND DURABILITY ANALYSIS OF STEEL SUPPORTING STRUCTURE ON THE BELL TOWER OF ST. TRINITY CHURCH IN KROSNO