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Experimental Evaluation of a Bottom Flange Friction Device for a Self Centering Seismic Moment Resistant Frame with Post-Tensioned Steel Moment Connections

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Abstract

This thesis evaluates the development of an energy dissipation (ED) device for earthquake resistant self-centering steel moment resisting frames (SC-MRFs) with posttensioned steel moment connections (PT connections). This work is part of the research being conducted by a group led by Lehigh University in collaboration with Princeton and Purdue Universities under the NSF funded NEESR-SG research program. Previous work demonstrates that steel MRFs with PT connections can achieve good performance under the design earthquake by reducing inelastic deformations and returning the structure to its pre-earthquake position. However, additional research is required with respect to energy dissipation (ED) of the connections. The scope of this study included the assessment of various ED devices for use in a PT connection. The ED devices were evaluated based on: energy dissipation capability, material characterization, distortion, capacity, device constructability, and lifecycle /maintenance characteristics. Various devices were assessed and friction devices were chosen for use as an ED device for the connection in the form of a bottom flange friction device (BFFD). The BFFD consists of a vertically oriented slotted plate shop welded to the bottom beam flange as well as two outer built-up angles field bolted to the column. Sandwiched between the two outer angles are brass friction plates on each side of the slotted plate. The slots are over-sized in order to allow for rotation of the connection. High strength bolts with disc-spring washers provide the normal force, compressing the entire assembly together. The BFFD is simple to construct and install, lacks interference with the composite slab, and has good energy dissipation characteristics.

A simple analytical model for expressing the cyclic moment-relative rotation behavior of a PT connection with a BFFD was developed. A series of large-scale tests were conducted to experimentally evaluate th

Cite this work

Researchers should cite this work as follows:

  • Michael Wolski (2013), "Experimental Evaluation of a Bottom Flange Friction Device for a Self Centering Seismic Moment Resistant Frame with Post-Tensioned Steel Moment Connections," https://nees.org/resources/6866.

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