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I'm struggling to define the use of the modification factor K12 in timber design and what it accounts for. Can you guys explain it or point me in the right direction? I know that its based on the modulus of elasticity and slenderness factor but I have no idea why exactly its needed or what it...

Hey. Can anyone really explain the use of K12 modification factor in timber designing? I know that its based on the modulus of elasticity and the slenderness ration but i don't understand how its really important when designing a timber structure.

This is what I have so farhttps://files.engineering.com/getfile.aspx?folder=00530beb-a13c-4a2c-9b88-6efbc5e07512&file=so_far.docx

A compacted earth fill is constructed on a soft, saturated clay (figure below). The fill was compacted to an average dry unit weight of 19 kN/m3 and water content of 15%. The shearing strength of the fill was determined by CU tests on samples compacted to representative field conditions. The...