JSTE_V4_N3_RP3 Gyani Jail Singh Sasankasekhar Mandal Rajesh Kumar Journal on Structural Engineering 2320 - 2343 4 3 18 25 Shear lag phenomenon, Critical Columns, Inflection point In the present study, a 40 storey RCC framed tube building has been examined. The shear lag phenomenon is analysed in the framed tube structures, by various methods and are reported. The detailed investigation of the phenomenon in the tubular buildings is lacking. As the height of the buildings increases, the lateral load (wind load) becomes governing factor for design. Positive and negative shear lag occur in the bottom and top portion of the building, respectively. As the height increases, axial force in column is immediately adjacent to the corner column increase and with further increase in height, it shifts towards central column. Some column of compression flange may also develop tension right from the support depending upon height of the structure. Columns in upper storeys are critical columns for the designer as they may develop tension. The quantitative estimate will help in the design to fix preliminary section dimensions of different structural members. September - November 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3727