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IS CODE

NATIONAL BUILDING CODE OF INDIA

PART 6 STRUCTURAL DESIGN

Section 7 Prefabrication, System Building and

Mixed/Composite Construction:

7B Systems Buildings and Mixed/Composite Construction

1. SCOPE

This sub-section covers recommendations regarding modular planning, component size, joints, manufacture, storage, transport and erection of prefabricated elements for use in buildings and such related requirements for systems building and mixed/composite construction.

2.TERMINOLOGY

2.1 For the purpose of this sub-section, the following definitions shall apply.

2.1.1 Authority Having jurisdiction – The Authority which has been created by a statute and which, for the purpose of administering the Code/Part, may authorize a committee or an official or an agency to act on its behalf; hereinafter called the ‘Authority’

2.1.2 Basic Module – The fundamental module used in modular co-ordination, the size of which is selected for general application to building and its components.

NOTE- The value of the basic module has been chosen as 100 mm for the maximum flexibility and convenience. The symbol for the basic module is M.

2.1.3 Cellular Concrete – The material consisting of an inorganic binder(such as anime or cement or both) in combination with a tinely ground material containing siliceous acid (such as sand), gas generating material (for example, aluminum powder), water and harmless additives (optional); and steam cured under pressure in autoclaves.

2.1.4 Components – A building product formed as a distinct unit having specified sizes in three dimensions.

2.1.5 Composite/Mixed Construction – Construction involving two or more components, such as, prefabricated structural units of steel, prestressed concrete or reinforced concrete and cast in-situ concrete, timber, masonry in brickwork and block-work,glass and glazing connected together in such a manner that they act integrally.

2.1.6 Increments – Difference between two homologous dimensions of components of successive sizes.

2.1.7Module – A unit of size used in dimensional co-ordination.

2.1.8 Modular Co-ordination – Dimensional co-ordination employing the basic module or a multi- module.

NOTE – The purpose of modular co-ordination are:

a) to reduce the variety of component sizes produced, and

b) to allow the building designer greater flexibility in the arrangement of components.

2.1.9 Modular Grid – A rectangular coordinate reference system in which the distance between consecutive lines is the basic module or a multi – module. This multi – module may differ for each of the three orthogonal dimensions of the grid, two in plan and one in vertical direction.

2.1.10 Multi- module – A module whose size is a selected multiple of the basic module.

2.1.11 Prefabricate – To fabricate components or assembled units prior to erection or installation in a building.

2.1.12 Prefabricated Building – The Partly/fully assembled and erected building, of which the structural parts consists of prefabricated individual units or assemblies using ordinary or controlled materials, including service facilities; and in which the service equipment may be either prefabricated or constructed in-situ.

2.1.13 sandwich Panels – Panels made by sandwiching a layer of insulation material between two outer layers of hard durable materials like steel, dense concrete, plastic, cement based sheet, ceramic, etc. The hard coverings on two outer faces may be of same or different materials; the three layers being bonded with each other to behave as a composite panel.

2.1.14 Self- Compacting Concrete – Concrete that is able to flow under its own weight and completely fill the voids within the form-work, even in the presence of dense reinforcement without any vibration, whilst maintaining homogeneity without segregation.

2.1.15 Shear Connectors – Structural elements, such as anchors, studs, channels and spirals, intended to transmit the shear between the prefabricated member and the cast in-situ concrete and also to prevent separation at the interface.

2.1.16 System – The method of construction of buildings with certain order and discipline and repetitive operations using the prefabricated components, tunnel form or engineered shuttering, where the work is organized and follows a defined procedure.