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Analysis of RC Building Frame with Flexible Isolated Footing Subjected to Seismic and Gravity Load

Author(s):

Vindhya Lodhi , IES Institute of Technology and Managment Bhopal; Pradeep K.T.V., IES Institute of Technology and Managment Bhopal

Keywords:

RC Building Frame, Seismic and Gravity Load

Abstract

Reinforced concrete building consists of horizontal structural members such as beams and slabs and vertical structural members such as columns and walls that are supported by foundation system. The foundation support is assumed as either fixed or hinge support where the foundation transmit the loads from the structure to the soil medium which undergoes a settlement depending on the characteristics of the soil medium, which in turn causes vertical settlement and differential settlement and rotation of the footings, that results in redistribution of the column loads, the amount of which depends on the rigidity of structure and the load-settlement characteristics of the soil. Thus, the concept of soil-structure interaction comes into existence. In the present work, an attempt is made to analyse and study the multi-storeyed reinforced concrete building frames supported on isolated footings considering soil-structure interaction system, defining soil medium by springs of equivalent stiffness, subjected to gravity and dynamic loadings. A seven storey number of building frames are analysed and types of soil as medium sand supporting the foundation system to observe the more generalised effect of soil-structure interaction on building frames. The results obtained by analysis are used to study the effects of soil compressibility on foundation settlement, support reactions, column and beam forces in the building frames. The study reveals that vertical and differential settlements are found more critical in seismic loading compared to gravity loading and the values of critical support moment are observed to be more in flexible base system than that of fixed base system. This study also reveals that the variations in bending moments is found more in lower storey as compared to upper storey of buildings in gravity as well as in seismic loading.

Other Details

Paper ID: IJSRDV8I10139
Published in: Volume : 8, Issue : 1
Publication Date: 01/04/2020
Page(s): 1298-1301

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