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Structures located in earthquake zones subjected to

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Unformatted text preview: d for use in structures located in earthquake zones subjected to severe damage and for structures subjected to dynamic loading ( other than wind loading ), such as railway and highway bridges ( see IS : 1893-1975* and IS : 1977-1973t ). 0.6 \Velding of reinforcement bars covered in this specification done in accordance with t!le requirements of IS : 2751-1966:. shall be 0.7 In the formulation of this standard, due weightage has been given to international coordination among the standards and practices preva%ng in different countries in addition to re!ating it to the Practices in the field in this country. 0.8 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 accordance with IS : 2-19604. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard ( Part I ) covers the requirements of mild medium tensile steel plain bars in round and square sections reinforcement in concrete. steel and for use as 2. TEBMINOLOGY 2.0 For the purpose of this standard, the following definitions shall apply. 2.1 Bar - A hot-rolled 2.2 Bundle - Two bound together. 2.3 Coil - bar of steel of circular or more One continuous or square ‘ coils ’ or a number of cross-section. lengths properly bar as rolled in the form of a coil. ‘Criteria for earthquake resistant design of structures (r&d rtiiun ). tSpecifi:ation for structural steel ( ordinary quality ) ( sccmdretiion ). $Code of practice for welding of mild steel bars used for reinforced concrete construction. &Rules for rounding off numerical valua ( m&d). 4 IS : 432 ( Part I ) - 1982 2.4 Elongation - Increase in length of a tensile test piece under .stress. The elongation at fracture is conventionally expressed as a percentage of the original gauge len-,th of a standard test piece. 2.5 Nominal Size - The nominal size of a bar shall be the of the diameter of round bars and side of square bars. 2.6 Parcel - Any quantity of bars whether for examination and test at any one time. in coils or bundles, dimension presented 2.7 Ultimate Tensile Stress - The maximum load reached in a tensile test clivi:!ed by the original cro;s-sectional area of the gauge length portion of ihe test piece. 2.8 Yield Stress - Stress ( that is, load per unit cross-sectional area ) at which elongation first occurs in the test piece without increasing the In the case of steels with no such definite yield load during tcn;ile test. point, the yield stress is the stress under the prescribed testing conditions at \v!lich the ohserv-ed increase in the gauge length is l/200 of the gauge length when the rate at which the load applied is not more than 5 N/mm’js when approaching the yield stress. 3. TYPES AND GRADES 3.1 Reinforcement supplied in accordance classified into the following type...
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