Performance of vertically irregular multi-storey structure with influence of angle under seismic displacement demand by 2D ground motion

  Ashok Kumar,  Ankush Kumar Jain

The expectation from the structures, in terms of strength, energy conservation, and aesthetics, have been increased significantly and therefore new modern complex irregular buildings are coming into existence since the beginning of 2000. In order to analyse these irregular buildings, the methods should be more accurate so that any un-happening can be prevented. The aim of this study is to provide a better understanding of analysis of regular as well as irregular frame structure with storey displacement, storey drift and angle of incidence of earthquake under different conditions and limitations. For this study, we developed 3 models for regular and irregular building with similar floor plan, material and configuration. The first model is for regular building, the second model is for 1-stroey setback irregular building and the third model is for 2-storey setback irregular building. Each model was subjected to a real recorded ground motion at 0º, 30º, 45º, 60º, 90º, 120º, 135º, 150º and 180º of building in horizontal direction. A non-linear direct integration time history analysis performed using ETABS software. After dynamic analysis, obtained results shows displacement for each model building under the variation in incidence of angle of 2D ground motions. It can be seen from the obtained results that the displacement in direction of any type of building depends upon the frequency of input ground motions. Also, the response parameter demand increases and more than the allowable limit as per IS 1893:2002 due to variation in incidence of angle of earthquake and increase irregularity. The critical angle of incidence for various buildings is because of the change in geometry, stiffness and fundamental time period of building. The maximum values of the response parameter also depend on the orientation of columns of building. For the same loading in a particular direction, the irregular building has shown superior behavior in comparison to the regular frame.

Keywords- Irregular Building, Regularity index, Time History Function, ETABS.

Unique Identification Number - IJEDR1904059
Page Number(s) - 332-340
Pubished in - Volume 7 | Issue 4 | October 2019
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Ashok Kumar,  Ankush Kumar Jain,   "Performance of vertically irregular multi-storey structure with influence of angle under seismic displacement demand by 2D ground motion", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.7, Issue 4, pp.332-340, October 2019, Available at :http://www.ijedr.org/papers/IJEDR1904059.pdf