EFFECTS OF IRREGULARITIES ON THE SEISMIC RESPONSE OF A MEDIUM RISE STRUCTURE
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Abstract:
Structural engineers often come across buildings, which exhibit certain degrees of plan asymmetry. It may in fact even exist in a nominally symmetric structure, because of the uncertainty in the distribution of floor loads, uncertainty in the evaluation of the centre of mass and centre of stiffness, inaccuracy in the measurement of dimensions of the structural elements, or lack of precise data on the material properties. The performance of asymmetric buildings under seismic excitation is very poor and its behaviour is highly complex when compared to that of regular buildings. This paper focuses on the seismic induced torsion in asymmetric RC buildings. Equivalent Lateral Force Method (ELF) is adopted as per IS:1893(Part-1)-2002 codal provisions to study the induced torsion. ETABS software package is used to carry all the static and dynamic analysis by keeping these models in different seismic zones from Zone II to Zone V. The discontinuities in a lateral force resistance path, such as vertical offsets, are also considered here. The main framework involved studying the effect of irregular distribution of mass, asymmetric distribution of stiffness and irregular plan configurations and comparing it with the seismic response of a regular structure. The results showed that Base shear and lateral displacement were increasing with increase in the seismic intensity from Zone II to Zone V. Also the Base shear for mass irregularity is found more compared to all other irregularities.
Language:
English
Published:
Asian journal of civil engineering, Volume:18 Issue: 8, Dec 2017
Page:
1307
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