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Thanks for the advice Doc. Is there any other way to increase the strength, that is normally applied in actual situation nowadays?

The main members (rafter and ceiling) are 35x100 (mm). 5m span truss with 17.5 and 22.5 pitch. Mostly shear failure at rafter but some rafter seems to "buckle" when we look from the side... thanks

Hello. I'm new here and I found this site greatly helpful to fresh engineers like me. Currently I'm testing few trusses made from relatively light and soft timber. Although they passed minimum requirement for strength, deflection etc given in Standards (BS and AS), they still generally failed at...