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lrfd 046 - DESIGN ADJUSTMENT FACTORS where KL loading...

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Unformatted text preview: DESIGN ADJUSTMENT FACTORS where: KL : loading condition coefficient shown in Table 4.4. Cgb=[:—:]p; ng =[:—: )q; CE :8: )r l01 : 5-1/8 inches, b2 : width of bending member being checked in inches. For multiple piece width layups. b2 = width of widest piece in the layup. Thus, b2 £ 10.75 in., d1 = 12 inches, (12 = depth of bending member being checked in inches, 121 = 21 feet, t2 = length of bending member being checked between points of zero moment in feet, and Di Cl. r = as defined in Table 4.5. Table 4.4 Loading Condition Coefficients, KL Two e-ual concentrated loads at 1/3 conditions A11 loadin_ Table 4.5 provides the exponent values and reference dimensions for use with reference bending strength or ref- erence bending resistance. Separate exponent values are given for Western species and for Southern Pine. N0 vol- ume adjustment is required for properties other than SimdeS-a'n Beam Concentrated load at midspan Uniformly distributed load noints of sum Continuous or Cantilever Beam reference bending strength or reference bending resistance. Tables 4.7 and 4.8 gives CV values for Western species and Southern Pine glued laminated timbers, respectively, assuming the loading condition coefficient is equal to 1.0. Table 4.5 Exponents for Volume Factor Equation p ' 0.10 q 0.10 r 0.10 4.9 Curvature Factor, c. Exponent s an __ Western S ecies 0.05 0.05 0.05 The curvature factor, (3,, is used to adjust the refer- ence bending strengths and resistances of curved glued laminated timber members only. It takes into account the difference in extreme outer fiber stress between a curved member and a straight prismatic member, as well as any residual stresses that may remain in a lamination that has been bent to the stated curvature. However, the curvature factor, Cc, shall not be applied to reference bending strengths or resistances in the straight portion of a mem— ber, regardless of curvature in other portions. Also, this factor is not applicable to cambered glued laminated tim- ber members or in the design of pitched and tapered curved glued laminated timber members. The curvature factor, Cc, shall be calculated in accordance with the following equation: 0, = 1 —2000 i $2 [42] where: thickness of lamination in inches, R : radius of curvature of inside face of lamination in inches, APA/EWS ...
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