Scribd
Upload
83 views2 pages

Check Decking Bending Strength

This document summarizes checks performed on the bending strength and deflection of 90 x 35 pine decking with a 600mm span and 100mm load width. It was found that: 1) The decking has sufficient bending strength (0.23kNm) to resist the calculated maximum moment (0.011kNm). 2) The calculated deflection (0.1mm) is less than the maximum allowable deflection of 2mm. 3) The decking would have sufficient strength (deflection of 15.6mm) if the mid support settled by up to 15mm.

Uploaded by

avmurugan87
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
83 views2 pages

Check Decking Bending Strength

This document summarizes checks performed on the bending strength and deflection of 90 x 35 pine decking with a 600mm span and 100mm load width. It was found that: 1) The decking has sufficient bending strength (0.23kNm) to resist the calculated maximum moment (0.011kNm). 2) The calculated deflection (0.1mm) is less than the maximum allowable deflection of 2mm. 3) The decking would have sufficient strength (deflection of 15.6mm) if the mid support settled by up to 15mm.

Uploaded by

avmurugan87
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

B.

DESIGN DECKING

CHECK DECKING BENDING STRENGTH

(Strength Limit State)

Decking Span = 600mm Load Width = 100mm

• For 90 x 35Pine
fb = 14MPa
E = 6900Mpa
I = bd3/12 = (90)(35)3/12 = 32.1 x 104
Zc = bd2/6 = (90)(35)2/6 = 18375

W = 1.2G + 1.5Q
= [(1.2)(0.25) + (1.5)(1.5)](0.1)
= 0.26kN/m

M* = WL2/8 = (0.26)(0.6)2/8 = 0.011kNm

ФM = Фk1k4k6k9k11k12fbZ
= (0.9)(0.94)(14)(7260)
= 0.23kNm > M* (0.011kNm) ∴ OK

CHECK DECKING DEFLECTION

(Serviceability)

W = G + 0.7Q
= [(0.25) + (0.7)(1.5)](0.1)
= 0.13 kN/m

∆ = 5WL4/384EI = (5)(0.13)(600)4/(384)(6900)(32.1 x 104) = 0.1mm

Limit ∆max = L/300 = 600/300 = 2mm ∆ < ∆max ∴ OK

Neil McKenzie & Associates – 11-225 Floating Foundation Deck System 11


CHECK DECKING MAX DEFLECTION IF MID SUPPORT BLOCK SETTLED

(Strength Limit State)

ФM = 0.23 kNm

W = 8ФM/L2 = (8)(0.23)/1.22 = 1.28kN/m

∆able = 5WL4/384EI = (5)(1.28)(1.2)4/(384)(6900)(32.1 x 104) = 15.6mm < 15mm ∆allow

∴ Decking is OK if mid support is settled < 15mm

Hence under the strength limit state, deckings are strong enough to span 1200mm at

15.6 deflection.

Neil McKenzie & Associates – 11-225 Floating Foundation Deck System 12

You might also like