IS 875 (Part 1) : 1981 | Download Civil Engineeing Code

DESIGN LOADS (OTHER THAN EARTHQUAKE)

FOR BUILDINGS AND STRUCTURES

About IS 875 (Part 1) : 1981

This Indian Standard (Part 1) (Second Revision) was adopted by the Bureau of Indian Standards on 30 October 1987, after the draft finalized by the Structural Safety Sectional Committee had been approved by the Civil Engineering Division Council.

A building has to perform many functions satisfactorily. Amongst these functions are the utility of the building for the intended use and occupancy, structural safety, fire safety; and compliance with hygienic, sanitation, ventilation and daylight standards. The design of the building is dependent upon the minimum requirements prescribed for each of the above functions. The minimum requirements pertaining to the structural safety of buildings are being covered in this code by way of laying down minimum design loads which have to be assumed for dead loads, imposed loads, snow loads and other external loads, the structure would be required to bear. Strict conformity to loading standards recommended in this code, it is hoped, will not only ensure the structural safety of the buildings which are being designed and constructed in the country and thereby reduce the hazards to life and property caused by unsafe structures, but also eliminate the wastage caused by assuming unnecessarily heavy loadings.

This Indian Standard code of practice was first published in 1957 for the guidance of civil engineers, designers and architects associated with planning and design of buildings. It included the provisions for the basic design loads (dead loads, live loads, wind loads and seismic loads) to be assumed in the design of buildings. In its first revision in 1964, the wind pressure provisions were modified on the basis of studies of wind phenomenon and its effect on structures, undertaken by the special committee in consultation with the Indian Meteorological Department. In addition to this, new clauses on wind loads for butterfly type structures were included; wind pressure coefficients for sheeted roofs both curved and sloping, were modified; seismic load provisions were deleted (separate code having been prepared) and metric system of weights and measurements was adopted.

                                                With the increased adoption of the code, a number of comments were received on provisions on live load values adopted for different occupancies. Simultaneously, live load surveys have been carried out in America and Canada to arrive at realistic live loads based on actual determination of loading (movable and immovable) in different occupancies. Keeping this in view and other developments in the field of wind engineering, the Sectional Committee responsible for the preparation of the standard has decided to prepare the second revision in the following five parts:

Part 1 Dead loads

Part 2 Imposed loads

Part 3 Wind loads

Part 4 Snow loads

Part 5 Special loads and loads combinations 

Earthquake load is covered in a separate standard, namely IS: 1893-1984 which should be considered along with the above loads.

This standard deals with dead loads to be assumed in the design of buildings and same is given in the form of unit weight of materials. The unit weight of other materials that are likely to be stored in a building are also included for the purpose of load calculations due to stored materials.

a       This standard incorporates  IS: 1911 published  in 1967. The unit  weight  of  materials incorporated in this standard are based on information available through published Indian Standards and various other publications.

b    This edition 3.1 incorporates Amendment No. 1 (December 1997). Side bar indicates modification of the text as the result of incorporation of the amendment.

c        The values given in this standard have been rounded off in accordance with  IS : 2 - 1960

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