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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PERFORMANCE BASED ANALYSIS OF RC STRUCTURE WITH AND WITHOUT CONSIDERING SOIL STRUCTURE INTERACTION Dr. M Keshava Murthy1, Harini R2 1Professor, Dept of Civil Engineering, University Visvesvaraya College of Engineering, Bengaluru, India 2M.tech student, Dept of Civil Engineering, University Visvesvaraya College of Engineering, Bengaluru, India
---------------------------------------------------------------------***--------------------------------------------------------------------the soil, and therefore, this commerce affects the structural Abstract - There are considerable exchanges amongst
response. Thus, due to the consideration of interaction of soil and the structure remains a very crucial issue in earthquake design. Present study aims to understand the effect of soil inflexibility on various response parameters of erecting frames with and without considering the soil structure interaction.
structural engineers about structural modelling but not important about the modelling of foundation. While modelling any structure, the foundation is modelled in a truly simplistic manner. It's assumed as fixed, roller support. Still, in reality, analogous idealized foundations are truly rare. Ultimate of the foundations are footings, mat, piles, or other bedded structures. In fact, foundations are constantly huge structures by themselves. It may not always be good to simply convert them into single point and also assume them to be fixed or roller. The effect of soil structure interaction (SSI) on the Reinforced Concrete framed structures is directly told by the soil properties of the site. Pushover analysis which is also stated as Non linear static analysis is considerably accustomed procedures for the seismic assessment or evaluation of the structures. In the present work, the pushover model is used to measure the new structures seismic demand or for current structures. Pushover review is carried out by considering G+8 multi- storeyed structure in Zone II, III, IV, and V using ETABSv20 software in all soil types i.e., Hard, Medium and Soft soil.
1.1 Soil Structure Interaction Soil structure interaction is defined as a process where the seismic excitation that occurs in the underground soil not only causes the movement of soil but also affects response of the structure above the soil in turn this change in the structure causes changes in the soil movement. Although the effect of SSI on the rigid soil, structures that are low rise is negligible it's a very important aspect under consideration for soft soil, high rise structures, roadways, heavy structures nuclear power plants, hydraulic structures. This conservative simplification is valid for certain class of structures and soil conditions, similar as light structures in fairly stiff soil. Unfortunately, the supposition doesn't always hold true. In fact, the soil structure interaction can have a mischievous effect on the structural response, and neglecting SSI in the analysis may lead to unsafe design for both the superstructure and the foundation.
Key Words: Soil structure interaction, Modal analysis, Equivalent static analysis, Response spectrum analysis, Performance point.
1. INTRODUCTION
1.2 Approaches for Soil-Structure Interaction analysis
The failure of land compels masterminds to construct structures at site with lower favourable Geotechnical conditions in seismically active regions. Earthquake produces strong ground movements the impact on a structure during an earthquake relies upon the properties of the ground soil, intensity of earthquake and structural system. During an earthquake seismic waves are transmits through soil from the origin of disturbance to the structure the wave motion of the soil excites the structure, which in turn modifies the input motion by its movement relative to the ground. The movements of soil under foundation will interact with the distortions of the structure itself. Thus, a performance- grounded design is needed, which is incompletely satisfied through pushover analysis. Generally for seismic analysis, structures are assumed to be strictly restrained at the foundation position, and thereby neglecting the effect of SSI. But in reality, when a structure is in contact with an earthquake excitation it interacts with © 2023, IRJET
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Impact Factor value: 8.226
1. Methods based on the half-space theory a) Direct approach b) Indirect approach 2. Analytical methods a) Winkler approach b) P-y method c) Elastic continuum approach 3. Numerical Methods a) Finite element method b) Finite difference method c) Boundary element method
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