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http://dx.doi.org/10.5000/EESK.2004.8.3.097

Seismic Performance Evaluation of Inverted V Braced Steel Frames with Considering P-Δ Effects: A Case Study  

Lee, Cheol-Ho (서울대학교 건축학과)
Kim, Jeong-Jae (서울대학교 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.8, no.3, 2004 , pp. 97-103 More about this Journal
Abstract
Most of the columns in centrally braced steel frame buildings are usually designed as the gravity columns to reduce connection cost. For a rational seismic performance evaluation of centrally braced steel frame buildings, it is important to properly incorporate in the analysis  the P-${\Delta}$ effects arising from the gravity columns. An effective scheme for the P-${\Delta}$ effects modeling due to the gravity columns was illustrated based on the concept of fictitious leaning column. Seismic performance evaluation of inverted V braced steel frames with or without P-${\Delta}$ effects modeling was conducted by following the FEMA 273 NSP (Nonlinear Static Procedure). The problem in estimating dynamic P-${\Delta}$ modification factor (C3) in FEMA 273 was discussed. The results of this study indicated that the P-${\Delta}$ effects should be included in the seismic performance evaluation of centrally braced steel frames. This study also showed that the inverted V braced frames, retrofitted by applying the tie bars to redistribute the inelastic demand over the height of the building, exhibit significantly improved seismic performance.
Keywords
centrally braced steel frames; P-${\delta}$ effects; inverted v braced frames; seismic performance evaluation; seismic retrofit; buckling;
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