期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：8
页码：15688
DOI：10.15680/IJIRSET.2016.0508185
出版社：S&S Publications
摘要：Many existing buildings lack the seismic strength and detailing requirements of IS1893:2002 and IS13920:1993, because they are designed for only gravity loads or built prior to the implementation of these codes. Inpresent, study two buildings 8 and 12 storied are considered. Which are designed for only gravity loads according to IS456:2000 without ductile detailing as well as same buildings are designed as per seismic loading according to IS1893:2002 and ductile detailing. Seismic evaluation of these buildings is carried out with nonlinear static pushoveranalysis using SAP 2000 software. Moreover, the performance points and performance levels of existing andretrofitting cases are determined by capacity spectrum methods from SAP 2000. Gravity designed buildings are foundin LS-CP range for DBE condition whereas buildings designed for seismic loading according to IS 1893:2002 andductile detailing are at operational (B) to immediate occupancy (IO) level. Then various retrofitting schemes viz. SteelX braces, inverted V braces, shear wall are employed only for gravity designed buildings. For retrofit of the buildings,requirement of immediate occupancy (IO) under design basis earthquake (DBE) is aimed at. The evaluation ofstructural over strength, the global ductility, behavior factor of retrofitted buildings is extracted from pushover curve.Idealized force-displacement capacity curve is evaluated based on the method recommended by FEMA-356 provisions.The results are compared based on performance point, yield strength, lateral stiffness, and overstrength and ductilityparameters. The results show that there is no unique solution and several different schemes can be provided to giveadequate performance. Most increase in the lateral strength and stiffness is related to using steel X braces and shearwall respectively.
关键词：seismic evaluation; performance levels; pushover; steel X bracing; shear wall.
