Office building in New Delhi

Institute for Steel Development & Growth – India

Building use

Office building

Country/Region

India

Overview

The building consisted of four towers. One tower was constructed as steel-concrete composite and the rest were RC construction. The purpose of the tower was to house the meeting halls and the conference halls and no internal columns were allowed in this tower whose overall dimensions were 21m x 19m.

Basic information (construction date, number of stories, gross floor area, adopted design code, engineer(s), Contractor(s), etc.)

Construction date: 2011
Number of stories: 7
Gross floor area: 2,800m2
Adopted design code: IS11384
Engineer(s): Self and Mr. Shiladitya Chanda
Contractor(s): Central Public Works Department

Issue and/or innovation

The level of all the floors had to match the levels of the similar floors in the other RC towers as all the towers were interconnected. Since those towers had intermediate columns, the headroom for those towers were as per architectural requirements. However, since no intermediate columns were allowed in the composite towers, and to maintain the same head room as the RC towers the composite towers had to be designed in such a way that the overall depth of the steel girders had to be kept at a maximum of 650mm in spite of the total length of cross beam being 19.0m spaced at intervals of 3.5 meters.

Reason for composite solution

To allow for minimum depth of beam (restricted to 650mm) for a span of 19.0m.

Specific solution/technical details

High span induced high deflection at the center. The dead load deflection was taken care of by providing camber and the live load deflection was kept within the limit as prescribed in the code IS11384. The two flanges were kept the same in terms of dimensions. Shear studs were used to ensure composite actions.

Impact or effectiveness

Effectiveness lies in functionality. It served the purpose of provision of column free floors for conference hall and meeting rooms, and also reduced the number of columns which helped in faster construction. Provision of profiled sheets helped in faster construction of floor slabs. Overall, this tower was constructed in half the time compared to the other towers of the same building.