International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 3 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Seismic Behavior of RCC Frame Structure Considering Soil Structure Interaction Prashant Patil1, Abhishek Chaskar2, Pradeep Landage3, Rushikesh Bendre4, Ruturaj Patil5, Mayur Bhondave6 1Asst. Prof., Dept Of Civil Engineering, Sppu, ICEM, Pune, Maharashtra, India. 23456Dept
Of Civil Engg Pursuing Bachelorette Degree, ICEM, Pune, Maharashtra, India
Abstract - Generally, there is a common design practice for dynamic loading, in which it is assumed that the building is fixed at it bases, but in reality the soil medium allows movement to some extent due to its property to deform. Therefore, this may decrease the stiffness of the structure and hence may increase the natural periods of the system. Thus, this behavior of soil and structure affecting the total response of the structure is called as soil structure interaction. In the present work, to study the effects of soil-structure interaction on the seismic response of framed structures, frames with 3, 7 and 15 storey have been considered with base supported as fixed with and without considering the soil structure interaction. Buildings are modeled using STAAD-PRO software. Three types of soil i.e. hard, medium hard, and soft soil are used to SSI study.
are transmitted through soil from the origin and the wave motion of the soil excites the structure. The extent of damage caused by earthquakes depends essentially on the dynamic response of soil deposits, which is governed by the cyclic non-linear and strength characteristics of the soil.
The foundation and the superstructure are typically designed as two independent systems, and the superstructure is fixed at the bottom. The calculated seismic response of the building is generally dependent on the structure above ground level i.e., superstructure. This method is generally simple and convenient, but the energetic characteristics and earthquake response of buildings will be different than those of actual buildings, if we do not consider the flexible property of soil at the foundation as well as the surrounding soil, which may lead to an unsafe design, specially in case of the earthquake design and for the performance analysis of major and valuable structures, such as huge sky scrapers. The foundation designer must consider the behavior of both structure and soil and their interaction with each other. The interaction between the soil and the foundation is very much important for various civil engineering cases and it covers a wide spectrum of problems. These include the study of shallow and deep foundation, floating structure, retaining wall-soil system, tunnel lining, earth structure etc.
Key words: Dynamics of soil, Natural Time Period, Soil Structure Interaction, Stiffness, Staad-Pro.
I.
INTRODUCTION
Since the past 4 decades, there has been a many studies done for understanding the nature of earthquakes and their impact on structures. Considering few earthquakes in recent years, it is observed that the soil-structure interaction (SSI) effects play an important role in determining the behaviour of building structures. The response of a structure at the time of an earthquake mainly depends on the ground characteristics, the surrounding soil medium, its properties and the structure itself. The movements of soil under foundation will interact with the deformations of the structure itself. Soil dynamics involves the estimation of dynamic soil properties and the study of the behaviour of various types of soils under dynamic loads. Seismic waves
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