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High-strength bolted connection structure with no fire protection

  • US 20040050013A1
  • Filed: 09/12/2003
  • Published: 03/18/2004
  • Est. Priority Date: 09/12/2002
  • Status: Abandoned Application
First Claim
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1. A high-strength bolted connection structure with no fire protection, the high-strength bolted connection structure having the fire resistance of a steel structure comprising columns and/or beams, characterized in that ultra-high-strength bolts having a bolt tensile strength (TS) at room temperature of 1200 N/mm2 or higher and excellent fire resistance with a bolt shear proof stress (bτ

  • t) at 650°

    C. satisfying the relation <

    1>

    below, are used;



    t≧

    μ

    ×

    N
    0/(ν

    ×

    bAs)  



    <

    1>

    where bτ

    t;

    bolt shear proof stress at high temperature (N/mm2) bτ

    t=TSt/{square root}3 TSt;

    tensile strength of the bolts at high temperature (N/mm2) μ

    ;

    coefficient of slip at room temperature N0;

    design bolt tension (N) ν

    ;

    safety factor for long-term load bAs;

    cross-sectional area of bolt shank (mm2).

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