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    Chemical and Mechanical Properties of Steel Rebars Manufactured in Pakistan and Their Design Implications

    Source: Journal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 002
    Author:
    Muhammad Masood Rafi
    ,
    Sarosh H. Lodi
    ,
    Amir Nizam
    DOI: 10.1061/(ASCE)MT.1943-5533.0000812
    Publisher: American Society of Civil Engineers
    Abstract: The use of steel to reinforce concrete has been a long tradition, which is made possible by its strength and compatibility with concrete. Steel is also considered an ideal material for carrying out seismic-resistant construction due to its ductility and high-energy-absorption capacity. Raw materials from different sources are used in the manufacturing of steel bars in Pakistan. As a result, chemical composition, crystalline structure, and mechanical properties of these bars can vary from each other. This paper presents the results of chemical and mechanical tests on the cold-twisted ribbed and hot-rolled deformed steel reinforcing bars. Both types of bars are used in the construction industry in Pakistan. Although chemical composition of the bars met the requirements of the respective standards, a significant number of bars were unable to meet the specified strength and elongation requirements. The bar-failure percentage to meet the specified minimum yield strength was as high as 60%. A large variation in the data of rebar strength was noted. Design implications of using these bars were studied and it was found that the failure mode of flexural members may change from ductile to brittle. Therefore, suggestions are made for safe structural design. A reliability analysis is also carried out and modified values of strength-reduction factors in flexure and shear are suggested.
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      Chemical and Mechanical Properties of Steel Rebars Manufactured in Pakistan and Their Design Implications

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/67214
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    • Journal of Materials in Civil Engineering

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    contributor authorMuhammad Masood Rafi
    contributor authorSarosh H. Lodi
    contributor authorAmir Nizam
    date accessioned2017-05-08T21:56:34Z
    date available2017-05-08T21:56:34Z
    date copyrightFebruary 2014
    date issued2014
    identifier other%28asce%29mt%2E1943-5533%2E0000855.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/67214
    description abstractThe use of steel to reinforce concrete has been a long tradition, which is made possible by its strength and compatibility with concrete. Steel is also considered an ideal material for carrying out seismic-resistant construction due to its ductility and high-energy-absorption capacity. Raw materials from different sources are used in the manufacturing of steel bars in Pakistan. As a result, chemical composition, crystalline structure, and mechanical properties of these bars can vary from each other. This paper presents the results of chemical and mechanical tests on the cold-twisted ribbed and hot-rolled deformed steel reinforcing bars. Both types of bars are used in the construction industry in Pakistan. Although chemical composition of the bars met the requirements of the respective standards, a significant number of bars were unable to meet the specified strength and elongation requirements. The bar-failure percentage to meet the specified minimum yield strength was as high as 60%. A large variation in the data of rebar strength was noted. Design implications of using these bars were studied and it was found that the failure mode of flexural members may change from ductile to brittle. Therefore, suggestions are made for safe structural design. A reliability analysis is also carried out and modified values of strength-reduction factors in flexure and shear are suggested.
    publisherAmerican Society of Civil Engineers
    titleChemical and Mechanical Properties of Steel Rebars Manufactured in Pakistan and Their Design Implications
    typeJournal Paper
    journal volume26
    journal issue2
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0000812
    treeJournal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 002
    contenttypeFulltext
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