International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
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SEISMIC ANALYSIS OF RC STRUCTURE BY CONSIDERING SOIL STRUCTURE INTERACTION (SSI) Sushant khot1, Dr. M. V. Waghmare2 1Department of civil engineering, AISSMS College of Engineering, Pune, India.
2Department of civil engineering, AISSMS College of Engineering, Pune, India.
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Abstract - During the past years, researchers have
by beam on nonlinear Winkler foundation with soil structure interaction on tall ground story building0. Seismic ponding effect by considering soil structure interaction is performed and which results in increase in displacement demand for ponding and significant changes in story drift demand reduction0. The series of shake table experiment for understanding seismic response of Nuclear Power Plant with soil raft foundation in clay on scale down model for same foundations0. Study on effect of soil structure interaction on building with braced system for near and far field earthquake is studied along with different types of bracing methods, there are 49 types of strong back system is design for SSI effect[7]. The story drift for both the field earthquakes are investigated. Comparison between conventional and base isolation using soil structure interaction studied and results as increase in Storey drift 0. The effect of seismic isolators on steel asymmetric structure by considering SSI was studied by Radkia et al. and they observed the base isolators reduces the effect of SSI 0. Three types of soil were considered for soil modeling with base isolators. Base isolation on soft soil with layers is considered for steel structure for pile model, isolation model and pile plus isolators combinations. The effects of soil structure interaction for soil from different location in layered condition have not been considered. In this present study, G+10, G+15 and G+20-story structures for fixed base and flexible base condition developed using SAP 20000 with soft soil. The whole model is have been analyzed, under the various soil condition like soft clay from different locations considering in different layers.
investigated the behavior of structural response during earthquake with soil structure interaction (SSI). Accordingly, basic consideration of fixed-base condition analysis by neglecting the effect of soil behavior is carried out for seismic design of structure. Therefore, the effect of soil behavior is an important thing for the design considerations. The basic concept is known as the structure is resting on various types of soil underlying as the base for the foundation of that structure. For evaluate the natural behavior of building with soil interaction effect for the various types of soils and different layers of soil need to be considered for investigation. Accordingly, in this paper the seismic behavior of the RC structures for different types of soil individually and different soils in layer are carried out. For the study 3 different types of soil was tested for fundamental properties of that soil. The results after the analysis indicate that the storey deformation in individual soil increases. While the time period of building increases up to 61% for SSI model. Therefore neglecting SSI effect could be dangerous during earthquake. Key Words: Soil Structure Interaction, different location soil, layered soil.
1. INTRODUCTION A large portion of the structural building includes some sort of basic component with coordinate contact with ground. At the point when the earthquake forces (i.e. external forces), acts on these frameworks, the results are depends on relation between structural displacements and ground motion. Within the evaluation of structure subjected to earthquake force, it is generally assumed that the base of structure is conventionally fixed. The analytical formulations for the interaction between BI and SSI reported that stiffness ratio between period elongation and structures damping is increase[1]. As per Forcellini, the structural behaviour changes as base isolation is incorporated with SSI, it affect as change in lateral deflection and floor drift. The effect of the mutual behavior between the structure, the foundations and the soil in the various directions is studied using 3D numerical models and fragility curves for probability-based approach are described 0. Site amplification and soil structure interaction combine effect on fragility curve for different load resisting frame structure and different soil material 0. For the open ground story effect with SSI is studies precisely, Seismic assessment of irregular building
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1.1METHODOLOGY In this study used the finite element method(FEM), specifically SAP 20000 software, to analyse the behavior of symmetric Ordinary RC moment resisting frame (OMRF) structure models. The models of G+10, G+15, G+20 will be generated by considering soil mass. Total 15 models are there for different type of considerations. The structural models are generated as per IS codes 00. Soil sample from 3 different locations is collected and tested to obtain the soil properties which are required modeling the soil profile. Then all soil properties were used in 3 different layers with different models comparing with conventional type model i.e. without SSI. The models are prepared for the SSI effect.
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