caa a22 4500 445847514 CHVBK 20180317145403.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10518-010-9223-5 doi (NATIONALLICENCE)springer-10.1007/s10518-010-9223-5 An assessment of IS codal provisions for the design of low rise steel moment frames through incremental dynamic analysis [Elektronische Daten] [Puneet Patra, Baidurya Bhattacharya] The current Indian Standard (IS) code for seismic design of structures (IS 1893:2002) specifies the use of time history analysis for structures with height greater than 40m. However, for structures less than 40m it recommends the concept of equivalent static analysis. This study attempts to investigate the adequacy of the current design code when it comes to the actual evaluation of structures shorter than 40m subjected to seismic loading using dynamic analysis as opposed to the code specified static analysis. Incremental dynamic analysis, which subjects a structure to a progressively increasing series of intensity measures, has been adopted here for the purpose. Three 2D moment resisting steel structures under the 1991 Uttarkashi and the 2001 Bhuj earthquakes (both of which predate the current IS1893) have been studied—a single storeyed portal frame, a 2 storey 3 bay frame and a 3 storey 2 bay frame. While it can be argued that two records are never enough for any generalization, and that only a full probabilistic analysis can determine if the limiting collapse prevention probability has been exceeded for these structures, the IS code in both cases does significantly under predict the seismic demands on the structures. At the same time, and perhaps why the codal provisions usually work, the structural capacities are in most cases underestimated as well. These suggest that a thorough study is in order and that there is scope for rationalization in the IS codal provisions. Springer Science+Business Media B.V., 2010 Base shear nationallicence Steel nationallicence Deflection nationallicence Collapse nationallicence Earthquake nationallicence Incremental dynamic analysis nationallicence Indian Standard code nationallicence Pushover analysis nationallicence Capacity demand ratio nationallicence Ak : Design horizontal seismic coefficient for mode k nationallicence Ah : Design horizontal seismic coefficient (calculated according to IS code) nationallicence Φ ik : Mode shape of the ith floor due to kth mode nationallicence ω n : Natural (fundamental) vibration frequency of structure nationallicence EDP : Engineering Damage Parameter (also called Damage Measure) nationallicence hi : Height of the floor (storey height) nationallicence I : Importance factor associated with the structure nationallicence IDR : Inter-storey Drift Ratio (Defined as storey displacement/storey height) nationallicence IM : Intensity measure nationallicence MDOF : Multi degree of freedom nationallicence Pk : Modal participation factor nationallicence PGA : Peak Ground Acceleration nationallicence PGV : Peak ground velocity nationallicence Qik : Shear force on ith floor in kth mode nationallicence R : Response reduction factor nationallicence Sa : Spectral acceleration (pseudo spectral acceleration in true sense) nationallicence Sd : Spectral displacement nationallicence Se : Elastic slope of Sa-IDR graph nationallicence SDOF : Single degree of freedom system nationallicence UDL : Uniformly distributed load nationallicence Vb : Base Shear nationallicence Wi : Seismic weight of ith floor nationallicence Ws : Seismic weight of the structure nationallicence Z : Zone in which a structure is located nationallicence Patra Puneet Indian Register of Shipping, 52-A Adi Shankaracharya Marg, 400072, Powai, Mumbai, India aut Bhattacharya Baidurya Department of Civil Engineering, Indian Institute of Technology Kharagpur, 721302, Kharagpur, WB, India aut Bulletin of Earthquake Engineering Springer Netherlands 9/2(2011-04-01), 581-602 1570-761X 9:2<581 2011 9 10518 https://doi.org/10.1007/s10518-010-9223-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10518-010-9223-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Patra Puneet Indian Register of Shipping, 52-A Adi Shankaracharya Marg, 400072, Powai, Mumbai, India aut NATIONALLICENCE 700 1- Bhattacharya Baidurya Department of Civil Engineering, Indian Institute of Technology Kharagpur, 721302, Kharagpur, WB, India aut NATIONALLICENCE 773 0- Bulletin of Earthquake Engineering Springer Netherlands 9/2(2011-04-01), 581-602 1570-761X 9:2<581 2011 9 10518 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer