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    Design of Lintels

    Uploaded by

    AbheeshekGoel
    The document discusses design considerations for lintels over openings in masonry walls. It addresses: 1) The distribution of concentrated loads over lintels should not exceed 30 degrees from vertical; 2) For arching action to transfer loads around openings, the masonry units must have sufficient shear strength and be laid in a suitable bond pattern, and the mortar must be of good quality; 3) When designing lintels, assumptions include loads distributing uniformly over supports and arching transferring loads to the sides of openings, within certain length limits depending on wall and floor/roof geometry.

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    Design of Lintels

    Uploaded by

    AbheeshekGoel
    294 views6 pages
    The document discusses design considerations for lintels over openings in masonry walls. It addresses: 1) The distribution of concentrated loads over lintels should not exceed 30 degrees from vertical; 2) For arching action to transfer loads around openings, the masonry units must have sufficient shear strength and be laid in a suitable bond pattern, and the mortar must be of good quality; 3) When designing lintels, assumptions include loads distributing uniformly over supports and arching transferring loads to the sides of openings, within certain length limits depending on wall and floor/roof geometry.

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    Design of Lintels

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    The document discusses design considerations for lintels over openings in masonry walls. It addresses: 1) The distribution of concentrated loads over lintels should not exceed 30 degrees from vertical; 2) For arching action to transfer loads around openings, the masonry units must have sufficient shear strength and be laid in a suitable bond pattern, and the mortar must be of good quality; 3) When designing lintels, assumptions include loads distributing uniformly over supports and arching transferring loads to the sides of openings, within certain length limits depending on wall and floor/roof geometry.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    294 views6 pages

    Design of Lintels

    Uploaded by

    AbheeshekGoel
    The document discusses design considerations for lintels over openings in masonry walls. It addresses: 1) The distribution of concentrated loads over lintels should not exceed 30 degrees from vertical; 2) For arching action to transfer loads around openings, the masonry units must have sufficient shear strength and be laid in a suitable bond pattern, and the mortar must be of good quality; 3) When designing lintels, assumptions include loads distributing uniformly over supports and arching transferring loads to the sides of openings, within certain length limits depending on wall and floor/roof geometry.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 6

    Design of lintels:

    Distribution of Loads: The angle of distribution of concentrated


    loads shouldnt exceed 30 degrees with the vertical.

    Arching action: The phenomenon by which part of the load


    over an opening in the wall gets transferred to the sides of the
    opening in masonry is called arching. For arching to be effective:

    Masonry unit must have sufficient shear strength and must


    be laid in suitable bond
    The mortar must be of good quality

    Design of Lintel:
    Assumptions:
    1. Load from the lintel gets uniformly distributed over the
    supports
    2. Due to arch action masonry and floor loads above the
    triangle PRQ get uniformly distributed over the stretches of
    masonry CD and EF at the soffit level of the lintel and over
    the stretches GH and JK at the floor level.
    3. CD and EF being limited in length to L/2 while GH and JK
    limited in length to L or (L-H)/2 whichever is less.
    4. For the assumption of the arching action to be valid:
    a. Length of walls on both sides of an opening should be
    at least half the effective span of the opening
    AND
    b. Floor slab and roof slab doesnt fall into the triangle
    AND
    c. The is no opening intercepting the triangular region
    AND
    d. There is no concentrated load within the triangular
    portion
    5. In violation of any of these conditions lintel should be
    designed for full load over the opening up till the height of
    the floor slab.

    In this case less, lintel


    should be designed for
    full load over the
    opening regardless of
    the height of the floor
    slab shown

    The lintel is designed


    for load of masonry
    contained in the
    equilateral triangle plus
    load from the floor
    falling within the
    triangle.
    Permissible Stresses:

    Permissible stress: fb kskakp

    fb = Basic compressive strength based on crushing strength


    of masonry unit and grades of mortar, assuming:

    S R not exceeding 6
    Zero Eccentricity
    masonry unit having height to width ratio ( as laid ) equal
    to 0.75 or less

    Alternatively basic compressive stress may be based on


    results of prism test on masonry made from masonry
    units and mortar to be actually used in a
    particular job.

    Stress reduction factor

    Slenderness ratio of the element


    The eccentricity of loading.
    Area reduction factor - Smallness of the sectional area of
    the element and is applicable when sectional area of the
    element is less than 0.2 m2.

    The factor, k, = 0.7 + 1.5 A, A being the area of section in


    m2.

    Shape modification factor - Height to width ratio (as laid)


    this factor is applicable for units of crushing strength up to 15
    N/mm%

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