Civil Engineering and Architecture Vol. 12(2), pp. 840 - 849
DOI: 10.13189/cea.2024.120213
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Influence of Vertical Geometric Irregularities of Reinforced Concrete Buildings on the Time Period for Different Bay Widths and Building Heights

Sandeep G. S. , Jagadisha H. M. ^*, Sindhu V. N.
Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, India.

ABSTRACT

Seismic activities have proven to be devastating and cause immense loss of life and property. To minimize the impact of such activities, earthquake-resistant design of structures plays a major role. Analysis and design of earthquake-resistant structures need a better understanding of the building's response to seismic forces through static or dynamic analysis. The fundamental time period is one of the important parameters for understanding the seismic response of any building. Construction of buildings with irregularities has become common and inevitable in the present urban scenario. The Indian standard code recommends linear dynamic analysis of analytical models to obtain design lateral forces for all types of buildings. As per the code, the fundamental time period used in the calculation of base shear is mainly dependent on the height and base dimension of a building irrespective of building irregularities. In this paper, an attempt has been made to analyze the effect of vertical geometric irregularities for different bay widths and building heights on the fundamental time period of a building through Eigenvalue analysis. Extended Three-Dimensional Analysis of Building Systems (ETABS) software has been used to model 198 buildings with different vertical irregularities to determine the variation in the time period values in comparison with regular buildings. The effect of various parameters like number of storeys, bay widths and vertical geometric irregularities has been studied. It has been observed that the time period of the buildings is significantly influenced by the specific type of vertical geometric irregularity. Higher dependency on the number of building storeys and lesser dependency on bay widths for all types of vertical irregularities have been observed.

KEYWORDS
Dynamic Analysis, Eigenvalue Analysis, ETABS, Time Period, Vertical Geometric Irregularity

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Sandeep G. S. , Jagadisha H. M. , Sindhu V. N. , "Influence of Vertical Geometric Irregularities of Reinforced Concrete Buildings on the Time Period for Different Bay Widths and Building Heights," Civil Engineering and Architecture, Vol. 12, No. 2, pp. 840 - 849, 2024. DOI: 10.13189/cea.2024.120213.

(b). APA Format:
Sandeep G. S. , Jagadisha H. M. , Sindhu V. N. (2024). Influence of Vertical Geometric Irregularities of Reinforced Concrete Buildings on the Time Period for Different Bay Widths and Building Heights. Civil Engineering and Architecture, 12(2), 840 - 849. DOI: 10.13189/cea.2024.120213.