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Effect Of Stiffness Modification Factor on Behaviour of RC Structure

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Effect Of Stiffness Modification Factor on Behaviour of RC Structure

Prof. Ajay Singh, Vaibhav Tyagi

MTech in Structural engineering and construction-Roorkee institute of Technology, Roorkee Uttarakhand India

 

Abstract

In India most of the area are highly prone to seismic forces as when the seismic force hit the structure will cause harmful effect on RC Structure. Due to seismic force time cracks are formed on the non-structural members and so the stiffness of the member can be reduced.

The stiffness modifier concept is recently used in Indian standards (IS 1893: Part-1 2016 and IS 16700: 2017). As Stiffness the s most important property any element which shows capacity of element to resist external force and solidness of an element. In this paper we had studied different values of stiffness modifier given by different researchers and codes for serviceability limit of the structure.

The clause no. 6.4.3.1 of the code defines requirements for structural evaluation. It is mention in the clause that for structural analysis, for column 70% of the gross should be considered and for beam 35% of the gross should be considered. A detail analytical study carried out between building having stiffness modifiers and ordinary building without stiffness modifiers. The response spectrum method is good method can be applied to the models. The mode displacement is acquired by modelling the Structure in the Structure analysis software (ETAB). The main motive was to compare the modified Structure with the ordinary Structure. Parameter has help in comparison of these models. Result of displacement, drift and shear reinforcement were in very higher side when using stiffness modifiers so there is quite scope to classified stiffness modifiers value according to different height of the structure, shape of structure and earthquake zone.

Stiffness modifiers, Response spectrum method structure analysis software ETab seismic forces, Geometry of the structure


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