The IUP Journal of Structural Engineering :
A Study of Behavior of Gravity Columns in RC Building

Article Details
Pub. Date : Oct, 2018
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE41810
Author Name : Aruna S Gorjanal and M Manjunath
Availability : YES
Subject/Domain : Science and Technology
Download Format : PDF Format
No. of Pages : 14

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Abstract

In recent years, a universally encountered problem in construction is expenses of the construction materials. The diminution in sources of these materials has created scarcity, which in turn has led to the upgradation in cost of these materials. Many alternatives to natural construction materials such as M-sand, mineral admixtures, chemical admixtures, etc. are arising in market. With these alternatives, adoption of structural modifications in the building can take construction to the next level of economy. The latest IS code on ductile design and detailing of RC building subjected to lateral loads (IS: 13920-2016) has included a new concept in structural systems, i.e., gravity columns, which are designed to take only gravity loads, and necessary detailing requirements of these columns are also discussed. In the present study, various models, including gravity columns at different heights of the building, have been analyzed with the help of software ETABS 2013, and the performances of the models in terms of parameters base shear, storey displacements, storey drifts, storey stiffness, periods and frequencies of various modes are compared with conventional RC building. Models considered for the study are 12 storey RC buildings with shear walls and moment resisting frames for resisting lateral loads and gravity columns to resist gravity loads as well as the displacements from the lateral loads. The lateral load bearing members are ductile designed as per IS: 13920-2016, and a comparative study on the quantity of steel reinforcement given to all the models and RC conventional building has been done. The paper concludes that adoption of gravity columns in the building has shownreduction in base shear and stiffness of the building, and there is increase in the displacement of building by 3 to 6 mm, i.e., 13.25%. The reduction in reinforcement steel is 26.90% compared to RC conventional building, leading to economic construction.


Description

Gravity columns are the vertical load bearing systems which do not resist any lateral loads on the structure but are capable of taking displacements produced due to lateral loads (Archana, 2017). All the members of the building must be designed ductile when the building is located in zones III, IV, V (Francisco et al. 2016), except gravity columns since they are not taking any lateral loads. The deflection of frame columns resisting both gravity and lateral loads is more under minimum gravity loads than that is taken by the gravity columns due to higher eccentricity of loads (Archana, 2017).In steel structures, continuous gravity columns with partial restrained connections improve the collapse mechanism of the building (Flores et al., 2012). In dual load resisting system 25% of lateral loads are resisted by frame columns and 75% by shear walls (Smith and Alex, 1991). The gravity columns are designed for ‘R’ times the displacements due to factored equivalent static seismic loads and are detailed as per clause-11 of IS: 13920 (2016) as follows (Taranath, 2005; 2010; and Francisco et al. 2014):


Keywords

Gravity columns, Moment resisting frames, Shear walls, Ductile design, M sand, Mineral admixtures, Chemical admixtures

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