Estimating dynamic response from pushover type analysis through a semi-empirical approach

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dc.contributor.advisor Basu, Dhiman Kota, Tejaswi 2015-04-21T16:04:43Z 2015-04-21T16:04:43Z 2015
dc.identifier.citation Kota, Tejaswi (2015).Estimating dynamic response from pushover type analysis through a semi-empirical approach (M Tech Dissertation). Indian Institute of Technology, Gandhinagar, pp.249 (Acc No: T00053) en_US
dc.description.abstract Performance evaluation of buildings against a given level of seismic hazard is usually carried out using a displacement-based approach, called pushover analysis. Among its several variations, Modal Pushover Analysis (MPA) has become increasingly popular owing to its ability of accounting for the recorded ground motion explicitly. Structural performance parameters are usually expressed in terms of displacement and drifts. However, structures are often equipped with non-structural elements which are sensitive to the design response parameters like acceleration, velocity etc. Pushover analysis does not provide any information on the likely dynamic response parameters. In such a case, Incremental Dynamic Analysis (IDA) can be considered as a viable approach, which however is computationally expensive and rarely practiced in a routine job. In this thesis, a semi-empirical method is proposed which uses the modal pushover response to predict an approximate estimate of design dynamic response parameters such as, acceleration and velocity. While doing so, frequency at each analysis stage (i.e., Peak Ground Acceleration (PGA) level) is first estimated from the pushover curve. Variation of maximum absolute acceleration across the height is estimated semi-empirically using the response of linear time history analysis, and frequency and base shear calculated in MPA. Variation of absolute maximum velocity across the height is estimated in an analogous way using that of the absolute maximum displacement response, frequency and modal mass participation factor at the stage of analysis considered. In order to illustrate the methodology, three test-beds are considered: 1) a ten-storeyed building designed conforming to Indian seismic code 2) a seven- storyed existing building located in seismic zone-IV of India and 3) a ten storey unsymmetric building designed as per Indian seismic code. Three seismic events recorded at the Large Scale Seismic Testing (LSST) array in Lotung, Taiwan are used for the purpose of illustration. Absolute acceleration and velocity distributions across the height using the proposed approach are found in well agreement with that from rigorous IDA. en_US
dc.description.statementofresponsibility by Tejaswi Kota
dc.format.extent xxii, 249 p.; col.; ill; 24 cm. + 1 CD-ROM
dc.language.iso en en_US
dc.publisher Indian Institute of Technology, Gandhinagar en_US
dc.subject Seismic Performance Evaluation en_US
dc.subject Seismic Performance Levels en_US
dc.subject Modal Pushover Analysis en_US
dc.subject Incremental Dynamic Analysis (IDA) en_US
dc.subject Peak Ground Acceleration (PGA) Level en_US
dc.subject Large Scale Seismic Testing (LSST) en_US
dc.title Estimating dynamic response from pushover type analysis through a semi-empirical approach en_US
dc.type Thesis en_US
dc.contributor.department Civil Engineering M.Tech.

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