TIMBER STRUCTURES AND BUILDING …...Dowel type timber joints Connector joints Truss plate joints 7...
Transcript of TIMBER STRUCTURES AND BUILDING …...Dowel type timber joints Connector joints Truss plate joints 7...
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KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association
TIMBER STRUCTURES AND BUILDING CONSTRUCTION
www.kit.edu
Connections for timber structuresHans J. Blass
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Timber Structures and Building Construction2 09.08.2010 Hans J. Blass
Timber bridge in Sneek, NL
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Timber Structures and Building Construction3 09.08.2010 Hans J. Blass
Timber joints
Glued jointsJoints with mechanical fastenersCarpenter joints
Glued joint
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Timber Structures and Building Construction4 09.08.2010 Hans J. Blass
Timber joints
Glued jointsJoints with mechanical fastenersCarpenter joints
Joint with mechanical
fasteners
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Timber Structures and Building Construction5 09.08.2010 Hans J. Blass
Carpenter joint
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Timber Structures and Building Construction6 09.08.2010 Hans J. Blass
Joints with mechanical fasteners
Dowel type timber jointsConnector jointsTruss plate joints
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Timber Structures and Building Construction7 09.08.2010 Hans J. Blass
Connector joint
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Timber Structures and Building Construction8 09.08.2010 Hans J. Blass
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Timber Structures and Building Construction9 09.08.2010 Hans J. Blass
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Timber Structures and Building Construction10 09.08.2010 Hans J. Blass
Johansen‘s model
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Timber Structures and Building Construction11 09.08.2010 Hans J. Blass
Plug shear
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Timber Structures and Building Construction12 09.08.2010 Hans J. Blass
Splitting
a1
a3
a4a2
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Timber Structures and Building Construction13 09.08.2010 Hans J. Blass
Reinforcement using screws with continuous thread
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Timber Structures and Building Construction14 09.08.2010 Hans J. Blass
Screws stop crack growth
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Timber Structures and Building Construction15 09.08.2010 Hans J. Blass
Screws loaded in shear
0,5·F 0,5·F
F
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Timber Structures and Building Construction16 09.08.2010 Hans J. Blass
Inclination of fastener axis
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Timber Structures and Building Construction17 09.08.2010 Hans J. Blass
Truss action
0,5·F 0,5·F
F
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Timber Structures and Building Construction18 09.08.2010 Hans J. Blass
Fax
Fc,90
F0
Ffr
Truss action
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Timber Structures and Building Construction19 09.08.2010 Hans J. Blass
Bolted steel connections in shear
Source: Project KI-Smile
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Timber Structures and Building Construction20 09.08.2010 Hans J. Blass
Bolted steel connections in shear
Source: Project KI-Smile
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Timber Structures and Building Construction21 09.08.2010 Hans J. Blass
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Timber Structures and Building Construction22 09.08.2010 Hans J. Blass
Truss connection
Photo: Wiehag
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Timber Structures and Building Construction23 09.08.2010 Hans J. Blass
Frankfurter Messehalle 11
Photo: Atlas Copco
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Timber Structures and Building Construction24 09.08.2010 Hans J. Blass
Inclined screws in steel-to-timber joints
Photo: Atlas Copco
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Timber Structures and Building Construction25 09.08.2010 Hans J. Blass
Inclined screws in steel-to-timber joints
Photo: Atlas Copco
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Timber Structures and Building Construction26 09.08.2010 Hans J. Blass
Connection test Stuttgart University
Ultimate load per shear plane:Test 1: FU = 6200 kNTest 2: FU = 6600 kN
Photo: Universität Stuttgart
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Timber Structures and Building Construction27 09.08.2010 Hans J. Blass
Failure mode: screw tensile failure
Photo: Universität Stuttgart Photo: Universität Stuttgart
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Timber Structures and Building Construction28 09.08.2010 Hans J. Blass
Screws parallel to member axis
A
B
B
A
glulam
glulam
CLT
A-AB-B
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Timber Structures and Building Construction29 09.08.2010 Hans J. Blass
Glulam
CLT
Threaded rods
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Timber Structures and Building Construction30 09.08.2010 Hans J. Blass
Screws parallel to member axis
A A
B
BB-B
A-A
glulam
CLT
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Timber Structures and Building Construction31 09.08.2010 Hans J. Blass
Axially loaded screws
Preliminary tests led to timber splitting or screw withdrawal after timber reinforcement
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Timber Structures and Building Construction32 09.08.2010 Hans J. Blass
Timber is anisotropic
Avoid perpendicular to the grain stressesDesign for low strength and stiffness perpendicular to the grainReinforcement
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Timber Structures and Building Construction33 09.08.2010 Hans J. Blass
Shear failure parallel to grain
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Timber Structures and Building Construction34 09.08.2010 Hans J. Blass
Fax
Fax
τ σc,90
σc,90
Shear reinforcement
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Timber Structures and Building Construction35 09.08.2010 Hans J. Blass
Crack
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Timber Structures and Building Construction36 09.08.2010 Hans J. Blass
Curved and pitched cambered beams
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Timber Structures and Building Construction37 09.08.2010 Hans J. Blass
Tensile failure perp. to grain
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Timber Structures and Building Construction38 09.08.2010 Hans J. Blass
Curved and pitched cambered beams
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Timber Structures and Building Construction39 09.08.2010 Hans J. Blass
Notched beam supports
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Timber Structures and Building Construction40 09.08.2010 Hans J. Blass
Reinforcement with screws
A
A-A
fully threaded screws
A
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Timber Structures and Building Construction41 09.08.2010 Hans J. Blass
Compression perp. to grain
Photo: Kreuzinger
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Timber Structures and Building Construction42 09.08.2010 Hans J. Blass
Fc,90
σc,90 = fc,90
Compression perp. to grain
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Timber Structures and Building Construction43 09.08.2010 Hans J. Blass
Fc,90
σc,90 < fc,90
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Timber Structures and Building Construction44 09.08.2010 Hans J. Blass
Fc,90
σc,90 < fc,90
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Timber Structures and Building Construction45 09.08.2010 Hans J. Blass
Fc,90
σc,90 < fc,90
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Timber Structures and Building Construction46 09.08.2010 Hans J. Blass
0
50
100
150
200
250
300
0 1 2 3 4 5
displacement in mm
load
R90
in k
N
non-reinforced
8 x 400 mm 8 x 260 mm
7,5 x 180 mm
Bottom view
Bottom view
Reinforcement using screws
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Timber Structures and Building Construction47 09.08.2010 Hans J. BlassThank you very much for your attention !