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HMT High Movement Timber Frame Wall Tie
Product code
Minimum cavity (mm)
Maximum cavity (mm)
HMT–50
45
65
HMT–50
Tested Values
Compression (kN)
Y m
Tension (kN)
Y m
Nail end (as received)
1.705
1.15 (3) (buckling of tie – steel failure)
0.895 (nail withdrawal)
1.3 (1)
Masonry end
2.376
1.15 (3) (buckling of tie – steel failure)
2.176 (masonry withdrawal)
3 (2)
(1) from BS EN1995-1-1 table 2.3 connections (fixing withdrawal of tie) (2) from NA to BS EN1996-1-1 table NA.1 (mortar failure of tie) (3) from NA to BS EN1995-1-1 table NA.3 (steel buckling of tie)
Based on the following criteria the following calculations have been done:
In the following examples a factored windload of 1.65kN/m 2 is suggested
Partial factor for variable action
1.5
Combined pressure coefficient
1.1
Peak velocity pressure
= 1.0 kN/m 2
Applied wind load on gable panel
= 1.5 x 1.1 x 1.0
= 1.65 kN/m 2
Failure
Test Result (kN)
Y m
kmod
Result x kmod / Y m (kN)
Compression
1.705
1.15
1.1
1.63
Tension
0.895
1.3
1.1
0.757
Tension
2.176
3
1.1
0.797
Compression
2.376
1.15
1.1
2.272 0.757
*An instantaneous action (kmod value – 1.1) has been used.
Maximum net surface wind pressure for the HMT–50
Product Code
Vertical Tie Spacing (mm)
225
300
375
450
Stud Centres (mm)
600
600
600
600
Maximum Net Surface Wind Pressure
ties/m 2
kN/m 2
ties/m 2
kN/m 2
ties/m 2
kN/m 2
ties/m 2
kN/m 2
HMT–50
5.6
7.4
4.16
5.5
3.33
4.4
2.8
3.7
1000/225 = 4.4444 4.4444x(1000/600) = 7.4 ties/m 2
1000/300 = 3.3333 3.3333x(1000/600) = 5.5 ties/m 2
1000/375 = 2.6666 2.6666x(1000/600) = 4.4 ties/m 2
1000/450 = 2.2222 2.2222x(1000/600) = 3.7ties/m 2
Lowest failure (with Ym & kmod applied)
0.757 x 7.4 = 5.6kN/m 2
0.757 x 5.5 = 4.16kN/m 2
0.757 x 4.4 = 3.33kN/m 2
0.757 x 3.7 = 2.8kN/m 2
Peak velocity pressure (kN/m 2 )
3.39
2.52
2.01
1.69
Based on the above values this could be worked backwards Provide a maximum wind load for 3.7 ties/m 2 = (2.8/1.1/1.5) = 1.69kN/m 2 peak velocity pressure
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