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LATERAL RESPONSE OF COLD-FORMED STEEL DIAPHRAGMS WITH VARIABLE SHEATHING

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dc.contributor.advisorKara D. Peterman
dc.contributor.advisorSergio F. Breña
dc.contributor.advisorMeghan Huber
dc.contributor.authorCastaneda, Hernan
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.date2024-03-28T16:22:35.000
dc.date.accessioned2024-04-26T15:55:07Z
dc.date.available2024-04-26T15:55:07Z
dc.date.submittedSeptember
dc.date.submitted2022
dc.description.abstractCold-formed steel (CFS) framed buildings and subsystems have demonstrated safe and reliable performance while under lateral and seismic loads. Combined with their structural efficiency, this makes CFS-framed buildings popular choice even in high seismic zones. However, due to the complexity in response of CFS members and their interaction in subsystem and system levels, more research needs to be conducted to better understand the overstrength in the system, as well as the contribution of non-structural components to the overall response of the building. The lateral force resisting system (LFRS) of CFS framed buildings consist primarily of shear walls and diaphragms. The current AISI S400 North American Standard for Seismic Design of CFS framed systems includes only the design of shear walls and diaphragms sheathed with structural wood panels (AISI 2015). In this design document in combination with provisions in ASCE 7-22, the design of shear walls is limited to seismic demand loads up to a 6-story building. The larger CFS-NHERI effort, of which this work is a part, seeks to expand this to 10 stories. The CFS-NHERI project culminates in a 10-story test on the shake table at UCSD UHPOST. To isolate diaphragm behavior, which can be convoluted in a full-scale building test. The UMass effort examines the performance of diaphragms under lateral load, sheathed with novel sheathings. The best performing of these specimens will be tested also on the shake table, planned for 2023. A total of eight 10 ft by 15 ft CFS diaphragm specimens with variable sheathing on two CFS framing systems were tested following the cantilever test method. For this, a test rig was designed, fabricated, and installed in the structural laboratory to allow in-plane loading of diaphragms. The framing systems are comprised of 54 mils floor joist spaced by 2 ft and 97 mils joist spaced by 4 ft. Specimen sheathings included Oriented Strand Boards (OSB), steel deck, and a new dual structural skin system: structural Fiber Cement Boards (FCB) fastened to steel deck. Specimens were tested under monotonic and cyclic loading. The cyclic loading protocol was adopted from FEMA 461 (FEMA 2007). Results of this work provide a unique characterization of the lateral response of a CFS diaphragm sheathed with the dual skin system in which its behavior and strength are unknown, as well as a detailed progression of failure and failure mechanism in the diaphragms sheathed with form deck. Ultimately, a comparison with current design methods and design recommendations are provided.
dc.description.degreeDoctor of Philosophy (PhD)
dc.description.departmentCivil Engineering
dc.identifier.doihttps://doi.org/10.7275/31023083
dc.identifier.orcidhttps://orcid.org/0000-0003-3895-6932
dc.identifier.urihttps://hdl.handle.net/20.500.14394/18950
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=3773&context=dissertations_2&unstamped=1
dc.source.statuspublished
dc.subjectCFS diaphragms
dc.subjectcantilever test
dc.subjectfiber cement board
dc.subjectsteel deck
dc.subjectseismic design
dc.subjectCFS-NHERI
dc.subjectCivil Engineering
dc.subjectStructural Engineering
dc.titleLATERAL RESPONSE OF COLD-FORMED STEEL DIAPHRAGMS WITH VARIABLE SHEATHING
dc.typeopenaccess
dc.typearticle
dc.typedissertation
digcom.contributor.authorisAuthorOfPublication|email:hercastaneda@hotmail.com|institution:University of Massachusetts Amherst|Castaneda, Hernan
digcom.identifierdissertations_2/2602
digcom.identifier.contextkey31023083
digcom.identifier.submissionpathdissertations_2/2602
dspace.entity.typePublication
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