Abstract
A research is carried out to investigate the cyclic behavior of beam-to-column connections. Three different typologies were tested, which represent frequent applications in steel construction. The specimens are submitted, in a multi-specimen testing program, to constant amplitude displacement histories, in order to develop a cumulative damage model. Such a model is based on the Ballio-Castiglioni hypothesis and Miner's rule, and lead to the assessment of possible classes of fatigue resistance for the examined typologies of beam-to-column connections. Based on the experimental results of this and previous research programs carried out, a general failure criterium is proposed for steel components under low-cycle fatigue. This chapter presents preliminar results of a research program on low-cycle fatigue of semi-rigid beam-to-column connections. After identifying a limited number of structural steel details, they were realized and tested under low cycle fatigue. The aim of the research is to try to establish classes of (low cycle) fatigue resistance for connections, similar to those existing for structural details under high cycle fatigue.
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