Mr. Gautam Suri
Building tall with steel also allows more floors per total height of the building. This is due to the fact that the building structure in steel is lighter and more efficient, and has beams and that are not required to be as deep as those of concrete to support the floors. The ability to have lighter sections, allowing the same load bearing capacity per floor, allows space for almost 1.5 extra floors in the same overall external height of the building.
Pre-engineered steel systems, that are our specialty, allow further optimization and further efficiency in multistory steel building design. Delving into the mechanics of high rise building construction, we see that the introduction of hot rolled steel sections, using higher grade steel add more strength to the building. Better steel decking as a construction material brought about a revolution in the steel building space. Composite steel decking laid on each floor adds ability to transfer lateral loads more effectively through the structure aiding the structure to be stronger than conventional rigid materials. This added strength per floor allows the overall core steel structure to be lighter and even more efficient. High-rise frames are constructed of H-columns or box columns, (vertical-support members) and H-beams (horizontal-support members). Cross bracing or shear walls are used to provide a structural frame with greater lateral rigidity in order to withstand wind stresses.
Use of steel makes it possible to create large, column-free internal spaces; thus, these are particularly advantageous for open-plan offices and large auditoriums and concert halls. The steel frame when compared with R.C. frame results in sufficient extra space to accommodate all service conduits without significant loss in head room.
Another significant aspect of pre-engineered steel buildings is that they are faster to erect compared with reinforced concrete frames. The elements of framework are pre-manufactured in the factory under effective quality control thus enabling a better product. The connections for each part are built in and pre-punched into the members and hence pre-engineered design reduces time, on-site activities, materials and labor, causing little disruption to normal life of the community, unlike wet concrete construction process.
The availability of the building in a shorter period of time results in economic advantages to the owner due to shorter period of deployment of capital, without return. In comparison with concrete construction, steel frames are significantly lighter. This results in much reduced loads on foundations. Not to forget, the foundation of high rise building usually consists of concrete piers, piles, or caissons that are sunk into the ground. Subsequent alterations or strengthening of floors are relatively easy in steel frames compared with concrete frames. The framework is not susceptible to delays due to slow strength gain, as in concrete construction.
Although, such construction technology in India is still at a nascent stage, the structural designs and technological development in the Indian pre-engineered construction industry has been geared up and ready provide such building solutions for almost 2-3 years. This form of construction will see widespread application in high rise buildings, infrastructure and housing in the coming years. This is a logical progression of the industry and India has a lot of catching up to do.