Since you brought this up that composite beams or adding steel plates to the sides of Glu-lams is ineffective fix can someone explain why instead of flooding the expert with questions.
Also the difference in properties (modular ratio) of the material should be taken into account.
David A. Hall, S.E., P.E.
Senior Structural Engineer
David Evans and Associates, Inc.
2828 SW Corbett Ave
Portland, OR 97201