[CCMC 11996-L] CCMC Standard compliance evaluation

From: National Research Council Canada

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  Product information

Product name

MT20

Product description

The “MT20” truss plate is manufactured from 20 gauge steel sheet that meets the minimum strength and yield requirements of ASTM A653, SS Grade 40 SQ275 and galvanized with G90 zinc coating per ASTM A924/A924M. The “MT20” truss plate has an uncoated nominal thickness of 0.91 mm and is stamped with 0.0124 teeth per square mm. The teeth are approximately 8.3 mm in length.

Manufacturing plants

This evaluation is limited to products produced at the following plant(s):

  • Bradford, Ontario, Canada

  Technical information

This evaluation is based on demonstrated conformance with the following criteria:

Evaluation requirements
Criteria number Criteria name
CSA-S347-14Method of Test for Evaluation of Truss Plates Used in Lumber Joints
Results of testing the ultimate tensile strength
Grade of steel Uncoated nominal plate thickness (mm) Mean ultimate tensile (MPa) Correction factor
SQ275 0.914 400 0.872

 

Results of testing the lateral resistance of the teeth (hydraulic press)
Direction of load

Specific strength (MPa/Plate)

Specific gravity (SG) = 0.42

Ultimate lateral resistance, nu Lateral slip resistance, ns
Load parallel to grain, plate length parallel to load 2.24 2.37
Load parallel to grain, plate length perpendicular to load 1.80 2.17
Load perpendicular to grain, plate length parallel to load 1.28 1.66
Load perpendicular to grain, plate length perpendicular to load 1.34 1.62

 

Roller press modification factors
Roller diameter Roller feed speed Ultimate strength modification factor, Kpu Slip modification factor, Kps
610 mm (24 in.) 45.7 m/min (150 ft/min) 0.69 0.83

 

Results of testing the tensile strength
Direction of load Unit Limit states design tensile resistance, tp
Plate length parallel to load N/mm/plate 174
Plate length perpendicular to load 164

 

Results of testing the shear strength
Limit states design
Angle (degree) Shear resistance, vp (N/mm/plate) Slots in plate axis
0, 180 107 ^
30T 127 //
30C 88 ^
60T 153 //
60C 69 ^
90 83 //
120T 102 ^
120C 81 //
150T 128 ^
150C 76 //

Administrative information

Disclaimer

This evaluation is issued by the Canadian Construction Materials Centre (CCMC), part of the Construction Research Centre at the National Research Council of Canada (NRC). The evaluation must be read in the context of the entire CCMC Registry of Product Assessments and the legislated applicable building code in effect.

The CCMC was established in 1988 on behalf of the applicable regulator (i.e., the provinces and territories) to ensure—through assessment—conformity of alternative and acceptable solutions to regional building codes as determined by the local authority having jurisdiction (AHJ) as part of the issuance of a building permit.

It is the responsibility of the local AHJs, design professionals, and specifiers to confirm that the evaluation is current and has not been withdrawn or superseded by a later issue. Please refer to the website or contact:

Canadian Construction Materials Centre
Construction Research Centre
National Research Council of Canada
1200 Montreal Road
Ottawa, Ontario, K1A 0R6
Telephone: 613-993-6189
Fax: 613-952-0268

The NRC has evaluated the material, product, system or service described herein only for those characteristics stated herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (i.e., AHJs, design professionals and specifiers). This evaluation is only valid when the product is installed in strict compliance with the stated conditions and limitations of evaluation and the applicable local building code. In circumstances where no applicable local building permit is issued and that no confirmation of compliance ‘for use in the intended field application’ is undertaken, this evaluation is null and void in all respects. This evaluation is provided without representation, warranty, or guarantee of any kind, expressed, or implied, and the NRC provides no endorsement for any evaluated material, product, system or service described herein. The NRC accepts no responsibility whatsoever arising in any way from any and all use and reliance on the information contained in this evaluation with respect to its compliance to the referenced code(s) and standard(s). The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.

Language

Une version française de ce document est disponible.
In the case of any discrepancy between the English and French version of this document, the English version shall prevail.

Copyright

© 2021 Her Majesty the Queen in Right of Canada, as represented by the National Research Council of Canada.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

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