Shear failure mechanism III in cross laminated timber : Numerical investigations of fracture behaviour

• The paper deals with numerical investigations of load-bearing capacity and fracture behaviour of CrossLaminated Timber at in-plane shear loading. Focus is on shear failure mechanism III, i.e. failure in the crossing areasbetween flatwise bonded laminations, and on evaluating test methods for that failure mode. In current design provisions,this failure mode is characterised by the rolling shear strength, fv,R , and the torsional shear strength, fv,tor , and thereforetesting including both transverse (rolling) shear and torsional shear is needed. Two such test set-ups are investigated, oneaiming at evaluating torsional shear strength and one aiming at evaluating rolling shear strength. Full 3D finite elementanalyses applying a cohesive zone model approach were used to study the strength and fracture behaviour. Failure criteriafor structural design, material strength parameters, and the suitability of the two test configurations to determine strengthparameters are discussed in relation to findings from the numerical investigations. One main conclusion from theinvestigation is that expected test results using the torsional test set-up are less size dependent as compared to test resultsusing the transverse set-up. The numerical analyses suggest a very small influence from tensile loading perpendicular tothe crossing area, for both test set-ups.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Building Technologies (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Tillförlitlighets- och kvalitetsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Reliability and Maintenance (hsv//eng)

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