Civil Engineering and Architecture Vol. 11(6), pp. 3527 - 3537
DOI: 10.13189/cea.2023.110622
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Dynamic SSI of Regular and Stiffness Irregular Buildings Supported on Pile in Soft Clay

Subramanya K. G. ^1,*, L Govindaraju ², R. Ramesh Babu ^3
1 Department of Civil Engineering, Government Sri Krishnarajendra Silver Jubilee Technological Institute (GSKSJTI), India
² Department of Civil Engineering, University of Visvesvaraya College of Engineering (UVCE), India
³ Department of Civil Engineering, Ramaiah University of Applied Sciences, India

ABSTRACT

The configuration of the structure plays an important role in its seismic behaviour. Irregularities in either the building's plan or elevation have been identified as significant contributors to failure during seismic events, making irregular structures, particularly those in seismic zones, a major concern. In traditional seismic analysis, structures are usually assessed with fixed base, neglecting the dynamic interaction between soil, foundation, and the structure itself. The objective of the study is to analyse the impact of dynamic SSI on the response of a 10-storey model, designed to represent a prototype with both regular and stiffness irregular configurations and to find relation between the lateral deflection of fixed and flexible base through numerical investigations for regular building frames. To achieve this, laboratory experiments were conducted utilizing a shake table and FE analyses were carried out. The behaviour of the model structures was examined under two scenarios: fixed base condition and flexible base condition, considering pile foundation. The experimental findings revealed that the soil-pile-structure system leads to amplified lateral deflections and storey drifts of the superstructure compared to the fixed base condition. Moreover, the model with stiffness irregularity exhibited higher response levels than the regular model under both base conditions. Furthermore, the irregular structure displayed an increased response amplification in the presence of soil-structure interaction, which has the potential to alter the overall performance of the structure. Numerical analysis was carried out considering varied height of the building frames under fixed and SSI condition and an attempt has also been made to relate the response of SSI condition to fixed base condition, which helps the designer to carry out conventional fixed base analysis and estimate the response under SSI for regular buildings.

KEYWORDS
Stiffness Irregularity, Shake Table Studies, Scaled Model Tests, Soil Pile Structure Interaction, Seismic Response

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Subramanya K. G. , L Govindaraju , R. Ramesh Babu , "Dynamic SSI of Regular and Stiffness Irregular Buildings Supported on Pile in Soft Clay," Civil Engineering and Architecture, Vol. 11, No. 6, pp. 3527 - 3537, 2023. DOI: 10.13189/cea.2023.110622.

(b). APA Format:
Subramanya K. G. , L Govindaraju , R. Ramesh Babu (2023). Dynamic SSI of Regular and Stiffness Irregular Buildings Supported on Pile in Soft Clay. Civil Engineering and Architecture, 11(6), 3527 - 3537. DOI: 10.13189/cea.2023.110622.