IS 1343 -1980 Code Book PDF free download

IS 1343 -1980 Code Book PDF free download


This Indian Standard ( First Revision) was adopted by the Indian Standards Institution on 30 December 1980, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council.  This standard was first published in 1960. This revision was taken up with a view to keeping abreast with the rapid development in the field of concrete technology and also to bring in further clarifications and modifications in the light of experience gained while applying the provisions of the earlier version of the code to practical situations.  The format and arrangement of clauses in the code have been changed from the earlier version. The matter has now been divided into four sections as follows: Section 1 General Section’ 2 Materials, Workmanship, Inspection and Testing Section 3 General Design Requirements Section 4 Structural Design: Limit State Method  In this revision, an attempt has been made to unify the coda1 provisions between prestressed concrete structures and reinforced concrete structures, as is necessary. As a result, many of the provisions in Section 2 Materials, Workmanship, Inspection and Testing and Section 3 General Design Requirements of IS : 456-1978” apply to prestressed concrete structures and, therefore, only reference has been made to such provisions in this code.  In some clauses, the code recommends reference to specialist literature, since the current knowledge on some aspects of design has not yet crystallized. This has also been done in order to avoid burdening the code with a lot of details which may not be required for the design of great majority of structures.  Units have been used in this code, the values of stresses being in units of N/mm*. While converting the values from the earlier units of kg/cm2, the values have been rationalized rather than giving the exact conversion. While deciding on the symbols used in this code, the recommendations of IS0 3898-1976* have been taken into consideration. However, considering the convenience of the users of the code, the familiar symbols of the old version have been retained to the extent possible. This revision incorporates a number of important changes. The major changes in this revision are on the following lines: a) The concept of limit state which provides a rational approach, taking into account variations in material strengths and loads on semi probabilistic basis, has been introduced. This, in fact, is a rationalization of the ultimate load method, covered in the earlier version. b) Provision for intermediate degrees of prestress (partial prestress) has been included. Consequentlv, the code covers 3 types of structures, the types being associated with the permissible tensile stress in concrete. C) The method of design for shear and torsion has been completely revised, incorporating the results of the latest research on the subject. d) Recommendations regarding transmission length of prestressing tendons have been elaborated. e) Recommendations for ensuring lateral stability during handling and erection have been modified. f ) Considerations regarding durability have been detailed with guidance concerning minimum cement content and maximum water-cement ratio for different environmental conditions,  including types of cement to be used for resisting sulphate attack. Limitations on total chloride and sulphate content of concrete have also been given. In IS : 456-1978?, major changes have been incorporated in provisions relating to materials, workmanship, inspection and testing, and general design requirements. In view of the attempt at unification between the provisions of reinforced concrete and prestressed concrete codes, these changes are relevant to prestressed concrete code also wherever reference has been made to related provisions of IS : 456-19787. In this code, it has been assumed that the design of prestressed concrete structures is entrusted to a qualified engineer, and that the execution of the work is carried out under the direction of an experienced supervisor.  The Sectional Committee, responsible for the preparation of this standard, has taken into consideration the views of manufacturers, users, engineers, architects, builders and technologists and has related the standard to the manufacturing and trade practices followed in this country in this field. Due weightage has also been given to the need for international co-ordination among standards prevailing in different countries of the world. These considerations led the Sectional Committee to derive assistance from the following: AC1 318-77 AC1 Standard building code reauirements for reinforced concrete. American ConcreteInstitute. ’ CP 110 : Part I : 1972 Code of practice for concrete: Part I Design, materials and Standards Institution. AS 1481-1974 SAA Prestressed concrete code. of Australia. the structural use of workmanship. British Standards Association Assistance has also been derived from the published documents of the following organizations: Comite Euro – International Du Beton International Standards Organization For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accorda.nce with IS : 2-1960”. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.



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