STEEL FRAMED BUILDING CONSTRUCTION

Steel Framed Building Construction



Steel Framed Building Construction

Only certain material properties of steel are discussed here—specifically, those that have bearing on the structural behavior of steel members. The most obvious, and important, structural properties are those relating force to deformation, or stress to strain. Knowing how a material sample contracts or elongates as it is stressed up to failure provides a crucial model for its performance in an actual structure. Not only is its ultimate stress (or strength) indicated, but also a measure of its resistance to strain (modulus of elasticity), its linear (and presumably elastic) and/or nonlinear (plastic) behavior, and its ability to absorb energy without fracturing (ductility).

Ductility is important in a structural member because it allows concentrations of high stress to be absorbed and redistributed without causing sudden, catastrophic failure. Ductile failures are preferred to brittle failures, since the large strains possible with ductile materials give warning of collapse in advance of the actual failure (Barry, 1999, pp.96).

A linear relationship between stress and strain is an indicator of elastic behavior—the return of a material to its original shape after being stressed and then unstressed. Structures are expected to behave elastically under normal “service” loads; but plastic behavior, characterized by permanent deformations, needs to be considered when ultimate, or failure, loads are being computed.

Stage 1: Planning

Buildings & houses are one of the oldest construction activities of human beings. The construction technology has advanced since the beginning from primitive consturction technology to the present concept of modern house buildings. The present construction methodology for buildings calls for the best aesthetic look, high quality & fast construction, cost effective & innovative touch (Barry, 1999, pp.96).

India being a developed country massive house building construction is taking place in various parts of the country. Since 30% of Indian population lives in towns and cities hence construction is more in the urban places. The requirement of housing is tremendous but there will always be a shortage of house availability as the present masonary construction technology cannot meet the rising demand every year. Hence one has to think for alternative construction system like pre-engineered steel buildings. India has an installed steel capacity of 35 to 40 million tonnes & apparent steel consumption is around 27 to 30 million tonnes (Barry, 1999, pp.123). There is a surplus capacity of flat steel products available in India particularly of hot and cold rolled sheets. These steel components can be utilised in the construction of pre-engineered building components. In pre-engineered building concept the complete designing is done at the factory and the building components are brought to the site in knock down condition. These components are then fixed / jointed at the site and raised with the help of cranes. The pre-engineered building calls for very fast construction of buildings and with good aesthetic looks and quality construction. Pre-engineered Buildings can be used extensively for construction of industrial and residential buildings. The buildings can be multi storeyed (4-6 floors). These buildings are suitable to various environmental hazards ...