International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Jul -2017
p-ISSN: 2395-0072
www.irjet.net
COMPARISON OF SOIL STRUCTURE INTERACTION FOR REGULAR AND IRREGULAR BUILDINGS WITH DIFFERING FLOOR LEVELS AND SOIL STRATUM Dheekshith K1, Anusha2, Babitha B3, 1,2Assistant
Professor, Department of Civil Engineering, Srinivas School of Engineering, Mangaluru Student, Department of Civil Engineering, Srinivas School of Engineering, Mangaluru ---------------------------------------------------------------------***--------------------------------------------------------------------3M.Tech
Abstract - In the current work, an effort is done to study
these soil structure interactions when the structure is built on different soil stratums for regular and irregular buildings with various floor levels. In this project, chosen two different soil layers for the analysis and the building is resting on isolated footing with Ground floor, (G+2) and (G+4) regular and irregular building is considered. Equivalent static analysis is carried out in order to study the displacement, Von Mises stress and stresses in X, Y and Z directions developed in the structure.
Key Words:
ANSYS MECHANICAL APDL, SOIL STRUCTURE INTERACTION, REGULAR AND IRREGULAR BUILDING, EQUIVALENT STATIC ANALYSIS
1. INTRODUCTION The greater part of the civil engineering structure includes some kind of structural component with direct contact with ground. At the point when these exterior forces, for example, seismic effects, act on these systems, neither the structural displacements nor the ground displacements are independent of each other. The method in which the reaction of the earth influences the action of the structure and the action of the structure influence the reaction of the soil is expressed as soil- structure interaction. It has normally considered that soil-structure interaction beneficially affects on the reaction of structure. Taking into account soil structure interaction makes the structure more flexible and accordingly rising the normal period of the structure compared to the inflexibly supported structure. The conventional overview is suitable only for certain class of structures and soil conditions, for example, light structures in moderately rigid soil. This statement does not constantly hold true. The soil structure interaction can enclose a damaging effect on the structural reaction and neglecting soil structure interaction in the study may direct to dangerous design for both superstructure and groundwork. The contact between the building, groundwork and soil layer underneath the footing modify the genuine performance of the building significantly acquired by considering the structure alone. Flexibility of soil layer beneath footing reduces generally, hardness of the structure. In the conservative investigation of a building, the base loads are computed without considering soil settlement. The structure is assumed as completely flexible structure in this kind of © 2017, IRJET
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Impact Factor value: 5.181
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study. The stress- strain features of soil layers are accountable for differential settlement. The forces of the structural members may change because of differential settlement. It is essential to consider building frame, base and soil as single important structural unit.
2. BUILDING DESCRIPTION Table -1: Description of RC framed structure Descript ion
Mode l-1
Mode l-2
Mod el-3
Mod el-4
Mod el-5
Mod el-6
No. of stories
Grou nd floor
Grou nd floor
(G+2 )
(G+2 )
(G+4 )
(G+4 )
Total floor height
3.2m
3.2m
9.6m
9.6m
16m
16m
Dimensio n of structure
16m x 20m
16m x 20m
16m x 20m
16m x 20m
16m x 20m
16m x 20m
Table -2: Material Properties of Concrete and Steel Property
Value
Grade of steel (N/mm2)
Fe 415
Grade of concrete for all structural members (N/mm2)
M-25
Modulus of elasticity of concrete (kN/m2)
Ec = 5000√fck = 5000√25 = 25x106
Poisson’s ratio for concrete
0.15
Concrete density
25 kN/m3
Table -3: Material Properties of soil Soil Type
Modulus of elasticity (kN/m2)
Poisson’s ratio
Hard Soil
65x103
0.3
Soft Soil
15x103
0.4
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