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Embedment Strength of New Zealand Cross Laminated Timber

As an innovative engineered timber product, Cross Laminated Timber (CLT) has gained popularity in New Zealand and world-wide over the last couple of decades. However, structural design with CLT is not currently covered by the New Zealand Timber Structures Standard NZS3603:1993 (NZS3603). Connection design with CLT is often a challenging task for designers, due to the cross-wise layup of timber laminations. Embedment strength is an important design parameter in timber connection design, and is not explicitly presented in the current version of NZS3603. Therefore, there is a need to establish and verify current design formulas for CLT embedment strength to give designers the required tools for safe connection design. This paper presents an experimental study evaluating the embedment strength of New Zealand made CLT. A total of 331 specimens with four different CLT layups and three different dowel diameters were subjected to half-hole embedment tests described in the ASTM D5764-97a test standard. The test results showed that the embedment strength formula given in the CLT Handbook, is generally applicable for New Zealand CLT made of radiata pine and the difference between the experimental results and the calculation results was within 5%.

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