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Report on the seismic performance of three-dimensional moment-resisting timber frames with frictional damping in beam-to-column connections

 
: Polocoser, T.; Leimcke, J.; Kasal, B.

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Advances in structural engineering 21 (2018), Nr.11, S.1652-1663
ISSN: 2048-4011
ISSN: 1369-4332
Englisch
Zeitschriftenaufsatz
Fraunhofer WKI ()
damping device; friction; laminated timber; moment frame; seismic; shake table

Abstract
The seismic performance of three-dimensional moment-resisting timber frames with frictional damping devices was investigated experimentally. This article describes a novel three-dimensional beam-to-column connection which was designed to behave rigidly up to moderate seismic intensities and to start the frictional dissipating behavior at higher intensities. The three-dimensional beam-to-column connection component was initially tested under cyclic loading, and then the connection was mounted in a three-level prototype frame and tested on a shake table. From the cyclic loading tests, the energy dissipation of the proposed beam-to-column connection was higher than the equivalent rigid connection. The frame demonstrated self-aligning capabilities without permanent drift at seismic intensities up to 1.4 g and maintained strength up to high seismic intensities of 2 g. Because wood frames allow for large elastic deflections and can exhibit excellent self-aligning capabilities (i.e., connections tolerate large rotations within safe stress levels), the proposed frictional beam-to-column connection is a promising alternative for moment-resisting timber frames that can be used to prevent structural members from reaching critical stresses.

: http://publica.fraunhofer.de/dokumente/N-481233.html