l2v2s05 truss testing - sbca truss knowledge online · develops better truss design assumptions,...

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


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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

6

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

4

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


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2 ft


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Load ShoesLoad Shoes

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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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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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QuizQuiz

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