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    Department of Civil Engineering

    NED University Engineering & Technology

    Building

    Prof Sarosh Lodi

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    Department of Civil Engineering

    NED University Engineering & Technology

    TOPICS COVERED

    Intro

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    Department of Civil Engineering

    NED University Engineering & Technology

    FLEXURAL MEMBERS OF SMRFGeneralClear span not less than 4 times effective depth

    Width/depth ratio not less than 0.3

    Width not less than 10 in

    Width not more than width of supporting member plus distance on each side

    of supporting member equal to of the depth of flexural member

    Cont.

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    Department of Civil Engineering

    NED University Engineering & Technology

    FLEXURAL MEMBERS OF SMRFLongitudinal ReinforcementReinforcement ratio not less than 200/fy

    Reinforcement ratio not more than 0.025

    Two bars should be continuous in top and bottom

    +ve moment strength at joint face should not be less than ofve moment

    strength

    +ve orve moment strength at any section should not be less than of

    strength at joint face

    Lap allowed only with hoop or spiral reinforcementLap splices are not allowed

    within joints

    a distance of 2d from joint face

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    Department of Civil Engineering

    NED University Engineering & Technology

    FLEXURAL MEMBERS OF SMRFLongitudinal Reinforcement

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    Department of Civil Engineering

    NED University Engineering & Technology

    FLEXURAL MEMBERS OF SMRFTransverse ReinforcementMaximum hoop spacing shall not exceed

    d/4

    8 times dia of smallest longitudinal bar

    24 times dia of hoop bar

    12 in

    Examples of hoops are

    Cont.

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRFGeneralShortest cross-sectional dimension is 12 in.

    Ratio of shortest dimension to perpendicular dimension shall not be less

    than 0.4

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRFReinforcementLongitudinal reinforcement ratio not less than 0.01 and not more than 0.06

    Concrete cover for transverse reinforcement shall not exceed 4 in.

    Spacing of rings (s) shall not exceed

    s= of minimum column dimension

    s=6 times dia of longitudinal bar

    s=4+[(14-hx)/3] 4< s

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRFReinforcementSpacing (S1) for the rest of column length is smaller of

    6 times longitudinal bar dia

    6 in.

    Example of rings is

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRF

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRF

    h l

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRF

    i i i i & h l

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    Department of Civil Engineering

    NED University Engineering & Technology

    COLUMNS FOR SMRFJoints

    Beam longitudinal reinforcement must be extended to the far face of column

    and anchored

    Column dimension parallel to the beam reinforcement not be less than 20

    times bar dia

    Transverse reinforcement shall be provided in joint

    NED U i i E i i & T h l

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    Department of Civil Engineering

    NED University Engineering & Technology

    INTERMEDIATE MOMENT RESISTING FRAMEBeams

    +ve moment strength at joint face should not be less than 1/3 ofve moment

    strength

    +ve orve moment strength at any section should not be less than 1/5 of

    strength at joint face

    First hoop provided at 2 in. from face of support

    Maximum hoop spacing shall not exceed

    d/4

    8 times dia of smallest longitudinal bar

    24 times dia of hoop bar

    12 in

    NED U i i E i i & T h l

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    Department of Civil Engineering

    NED University Engineering & Technology

    INTERMEDIATE MOMENT RESISTING FRAMEColumns

    Hoops provided at spacing (s) over length (L) from both ends

    s should be smallest of

    8 times dia of smallest longitudinal bar

    24 times dia of hoop bar

    of smallest dimension of frame member

    12 in

    L should be largest of

    1/6 of clear span of column

    Minimum dimension of column

    18 in

    NED U i it E i i & T h l

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    Department of Civil Engineering

    NED University Engineering & Technology

    INTERMEDIATE MOMENT RESISTING FRAMEColumns

    Hoops provided at spacing (s) over length (L) from both ends

    s should be smallest of

    8 times dia of smallest longitudinal bar

    24 times dia of hoop bar

    of smallest dimension of frame member

    12 in

    L should be largest of

    1/6 of clear span of column

    Minimum dimension of column

    18 in