TY - GEN
T1 - Distributed knee-braced (DKB) system as a complete or supplemental retrofit of soft-story wood-frame buildings
AU - Gershfeld, M.
AU - Chadwell, C.
AU - Van De Lindt, J.
AU - Pang, W.
AU - Ziaei, E.
AU - Amini, M.
AU - Gordon, S.
AU - Jennings, E.
N1 - Publisher Copyright:
© 2014 American Society of Civil Engineers.
PY - 2014
Y1 - 2014
N2 - The NEES-Soft NSF-sponsored project, as one of its objectives, evaluated the performance of various retrofit schemes for "soft-story" light wood-frame buildings subjected to seismic loading. The distributed knee-braced (DKB) system was one of the retrofits evaluated. This system consists of an assembly of light wood-frame knee-braced frames placed so as to reinforce an existing deficient line of resistance. The individual knee-braced frame is constructed by reinforcing existing wall studs with additional stud(s) and connecting them to the existing floor joists with new diagonal 2x wood members. The reinforcement of the members and connections along the knee-braced frame load path are designed to exceed the capacity of the knee-brace to stud and knee-brace to joist connection, thus creating a load fuse. The performance of DKB system was validated using reversed-cyclic testing, numerical modeling, hybrid testing, and shake table testing. The four-frame, 10-ft DKB system was able to develop a maximum lateral load capacity of approximately 2,400 lbs (1088 kg) at 4.5% drift and 1,000 lb (454 kg) at 7.5% drift. The findings suggest that the DKB system can be an effective alternative to other more traditional "soft-story" retrofits by providing strength at very large drift capacities.
AB - The NEES-Soft NSF-sponsored project, as one of its objectives, evaluated the performance of various retrofit schemes for "soft-story" light wood-frame buildings subjected to seismic loading. The distributed knee-braced (DKB) system was one of the retrofits evaluated. This system consists of an assembly of light wood-frame knee-braced frames placed so as to reinforce an existing deficient line of resistance. The individual knee-braced frame is constructed by reinforcing existing wall studs with additional stud(s) and connecting them to the existing floor joists with new diagonal 2x wood members. The reinforcement of the members and connections along the knee-braced frame load path are designed to exceed the capacity of the knee-brace to stud and knee-brace to joist connection, thus creating a load fuse. The performance of DKB system was validated using reversed-cyclic testing, numerical modeling, hybrid testing, and shake table testing. The four-frame, 10-ft DKB system was able to develop a maximum lateral load capacity of approximately 2,400 lbs (1088 kg) at 4.5% drift and 1,000 lb (454 kg) at 7.5% drift. The findings suggest that the DKB system can be an effective alternative to other more traditional "soft-story" retrofits by providing strength at very large drift capacities.
UR - http://www.scopus.com/inward/record.url?scp=84934343771&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84934343771&partnerID=8YFLogxK
U2 - 10.1061/9780784413357.250
DO - 10.1061/9780784413357.250
M3 - Conference contribution
AN - SCOPUS:84934343771
T3 - Structures Congress 2014 - Proceedings of the 2014 Structures Congress
SP - 2863
EP - 2874
BT - Structures Congress 2014 - Proceedings of the 2014 Structures Congress
A2 - Bell, Glenn R.
A2 - Card, Matt A.
PB - American Society of Civil Engineers (ASCE)
T2 - Structures Congress 2014
Y2 - 3 April 2014 through 5 April 2014
ER -