Abstract
The beam-to-column connection and columns in ductile moment-resisting frames must remain essentially elastic throughout the load history to ensure the lateral stability of the structure. This study examines the seismic performance of 4 one-half scale exterior beam-column subassemblages subjected to a large number of cyclic lateral loads to approximate severe earthquake damage. All subassemblages were typical of new structures and incorporated full seismic details from current Eurocode, American Concrete Institute and Greek building codes, such as a weak girder-strong column design philosophy. Results from the cyclic load tests indicate that provisions related to the design of beam-column joints in several of the codes investigated appear to need improvement. Current design procedures could sometimes result in excessive damage to the joint regions and the columns' critical regions. This can lead to premature lateral instability in ductile moment-resisting frames of modern structures.
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