A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Transforming Seismic Performance of Deficient Steel Concentrically Braced Frames through Implementation of Rocking Cores
The use of steel concentrically braced frames (CBFs) has substantially increased recently. However, investigations and observations from past earthquakes suggest that some existing CBFs, particularly the older ones that are still in service but were designed without ductile detailing and compliance with state-of-the-art seismic provisions, may exhibit unfavorable performance during strong earthquake events. This research numerically examines the adequacy of a seismic rehabilitation technology for deficient multistory CBFs. The technology consists of one or multiple rocking cores (RCs) added to an existing CBF to redistribute the seismic forces applied to the frame and reduce the system seismic response. For demonstration purposes, one three-story and one six-story CBF buildings are selected and rehabilitated using the RC technology. Finite-element (FE) models of the considered systems, which explicitly take into account the effect of gusset plates, member yielding, brace buckling, brace rupture, and the effect, are developed and validated. Through extensive nonlinear response history analyses using two suites of ground motions, seismic performance of the rehabilitated systems are evaluated. The results suggest that the RC technology is effective in enhancing seismic performance of low-rise- and midrise-deficient CBFs. Furthermore, the rehabilitated systems can benefit from the use of hysteretic energy dissipating links between RCs and existing CBF frames.
Transforming Seismic Performance of Deficient Steel Concentrically Braced Frames through Implementation of Rocking Cores
The use of steel concentrically braced frames (CBFs) has substantially increased recently. However, investigations and observations from past earthquakes suggest that some existing CBFs, particularly the older ones that are still in service but were designed without ductile detailing and compliance with state-of-the-art seismic provisions, may exhibit unfavorable performance during strong earthquake events. This research numerically examines the adequacy of a seismic rehabilitation technology for deficient multistory CBFs. The technology consists of one or multiple rocking cores (RCs) added to an existing CBF to redistribute the seismic forces applied to the frame and reduce the system seismic response. For demonstration purposes, one three-story and one six-story CBF buildings are selected and rehabilitated using the RC technology. Finite-element (FE) models of the considered systems, which explicitly take into account the effect of gusset plates, member yielding, brace buckling, brace rupture, and the effect, are developed and validated. Through extensive nonlinear response history analyses using two suites of ground motions, seismic performance of the rehabilitated systems are evaluated. The results suggest that the RC technology is effective in enhancing seismic performance of low-rise- and midrise-deficient CBFs. Furthermore, the rehabilitated systems can benefit from the use of hysteretic energy dissipating links between RCs and existing CBF frames.
Transforming Seismic Performance of Deficient Steel Concentrically Braced Frames through Implementation of Rocking Cores
Qu, Bing (author) / Sanchez-Zamora, Francisco (author) / Pollino, Michael (author)
2014-07-21
Article (Journal)
Electronic Resource
Unknown
Seismic performance of concentrically braced steel frames
| British Library Conference Proceedings | 2002
| British Library Conference Proceedings | 2014