Level II: Section 05 – Version 2.0Copyright © 2003-2006 WTCA
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Level II: Section 05 Truss Testing
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Section DownloadsSection Downloads
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Section DownloadsSection Downloads
Handouts & Slides can be printedVersion 2.0
Course binders are available for purchaseNot required
Download & PrintTTT II Sec 05 Slides
Level II: Section 05 – Version 2.0Copyright © 2003-2006 WTCA
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The Purpose of TestingThe Purpose of Testing
Full-scale load tests determine truss load carrying capacities & deflection behaviors.
Provides better understanding of truss behavior.Develops better truss design assumptions, analogs, & models.
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FullFull--Scale Testing Scale Testing Evaluate QC methodsCompare strength & performance of untreated vs. FRT wood trusses
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QC Testing GoalsQC Testing Goals
Develop quick & simple QC evaluationDetermine key evaluation on critical joints
ANSI/TPI 1-2002 Chapter 3
Section 11
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QC Data CollectionQC Data Collection
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Phase I TestingPhase I Testing-- July 2000July 2000
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QC Phase I Test SetupQC Phase I Test SetupHow do QC defects impact performance?30 trusses straight off the line
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Shear Failure Shear Failure
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Plate WithdrawalPlate Withdrawal
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Plate Withdrawal Plate Withdrawal
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Phase I Testing ConclusionsPhase I Testing Conclusions
Time consuming inspectionsPlate misplacement common occurrence but quick to measure
98% of plates installed with some translation55% installed with translation of ¼-inch or more
The other defects are hard to quickly measure
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Phase II Testing Phase II Testing –– January 2001January 2001
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QC Phase II Test SetupQC Phase II Test Setup
50 truss testsTargeted:
Plate misplacements Gap conditionsRolled teeth
24'
5'-4"
8' 8' 8'
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23
4
57
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8910
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Peak Plate Misplacement Peak Plate Misplacement
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Gap ConditionsGap Conditions
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Gap CreationGap Creation
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Plate PlacementPlate Placement
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Testing ITesting I
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Testing IITesting II
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Testing IIITesting III
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Testing IVTesting IV
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Testing VTesting V
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Testing VITesting VI
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Rolled TeethRolled Teeth
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Rolled TeethRolled Teeth
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Phase II Testing ConclusionsPhase II Testing ConclusionsMisplaced plates reduce truss capacity Small member-to-member gaps are OKFailures occurred in the joints of highest stress
24'
5'-4"
8' 8' 8'
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23
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57
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8910
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Data Enables Targeted ActionData Enables Targeted Action
1%5%% Translation 1˝ & above
2%16%% Translation ¾˝ & above
24%29%% Translation ½˝ & above
76%% Translation below ½˝
13,923hundredsNumber of Joints
In-Plant WTCA QCHouston I & II
71%
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FRT TestingFRT Testing
Comparison of the Laboratory Strength & Performance of Untreated and Fire Retardant Treated Wood Trusses
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FRT Test SetupFRT Test Setup
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23 Trusses
11 Trusses – untreated 2x4 SP 2400F-2.0E
12 Trusses – DFRT 2x4 SP 2400F-2.0E
FRT Test SetupFRT Test Setup
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FRT Test SetupFRT Test Setup
2 ft
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Load ShoesLoad Shoes
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FRT Test SetupFRT Test Setup
15,000 # capacity Load Cells
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Load CellsLoad Cells
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Hydraulic PumpHydraulic Pump
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Electronic Data AcquisitionElectronic Data Acquisition
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Electronic Data AcquisitionElectronic Data Acquisition
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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FRT Test ProcedureFRT Test Procedure
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Testing VideoTesting Video
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ConclusionConclusion
Test results show that the FRT trusses carries an average of 84% of the load carried by trusses using untreated lumber.
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