Performance assessment of framed Structural system retrofitted with Different lateral load resisting elements a Parametric study

Abstract

The principle objective of this project is to analyze the Regular and Irregular newline(Vertical-VI and Horizontal-HI) building by Linear analysis, Nonlinear newlineanalysis considering Lateral load resisting system (LLRS) with soil structure newlineinteraction (Modified Winkler method -MWM and Continuum method-CM) newlineusing appropriate software. newlineEarlier most of the multi-storey existing building was designed for gravity newlineload. However later only linear analysis considering design were adopted. newlineThe Linear analysis gives results corresponding to Base Forces and newlineDisplacement up to yield point. Practically speaking an existing building can newlineresist force beyond yield point also. However this aspect is not identified in newlinelinear analysis. Further if the building is subjected to Lateral loads, failure of newlinethe building takes place which needs to be strengthened by providing LLRS newlineor other techniques. Strengthening the building and analyzing again by newlineLinear analysis may hardly give results with reduced displacement and newlinegreater base force up to yield point. In order to predict results beyond yield newlinepoint, nonlinear analysis such as Pushover analysis should be performed newlinewhere the results beyond yield point is achieved. The pushover analysis newlinegives clear picture of different stages of the building before collapse and also newlineat collapse (i.e., results of base force and displacement with failure states newlinesuch as A-B, B-IO, IO-LS, and LS-CP). It gives results of Demand and newlineCapacity of the building also. Observing the results gives an idea to adopt newlineretrofitting techniques or not. Retrofitting an existing building should be newlineanalyzed considering the nonlinearity of the materials also. The retrofitting newlinetechniques like Shear wall and Bracings are adopted in many buildings. The newlinebuilding is analyzed after retrofitting to compare the results before and after newlineretrofitting. It is observed that building with provision of LLRS would newlineenhance the capacity of the building. newlineIn the present study, existing building of 10 storeys with Fixed and Flexible newlinebase (MWM and CM) for differ