Rotation Capacity of MR Beam-To-Column Joints Under Cyclic Loading (original) (raw)

2004

Abstract

Actual design codes and recommendations for ductile Moment Resisting Steel Frames in seismic zones require to beam-to-column joints to sustain a total rotation of 0.035 rad (in Europe) to 0.040 rad (in United States). The problem is that in codes, there are no analytical methods to predict the rotation capacity of MR connections, not even for monotonic loading, which is simpler then compared with seismic action of cyclic type. Even if last years appeared some proposals for analytical or numerical based methods to evaluate rotation procedure for their qualification in terms of ductility, still remain the prequalification tests, both for static and seismic actions. In the present paper, based on extended experimental studies, comparatively conducted under monotonic and cyclic loading on different types of connections, both for steel and composite MR frames, a reduction factor to be applied to monotonic rotation capacity is proposed in the purpose of evaluation of cyclic rotation capac...

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