|TO:||K. N. Kirker/Z. Y. Fahoum|
|DATE:||March 2, 1994|
|SUBJECT:||AASHTO Section 5.5.5,F. S. of Sliding for Retaining Walls|
Please prepare a letter for Myint Lwins signature to AASHTO requesting clarification on the 1.5 factor of safety. We use a 1.5 factor of safety for DL + LL + EP but reduce this value to 1.1 for DL + DP + EQ. This allows for sliding of the wall during an earthquake to relive seismic force buildup on the wall.
If you have any questions, please contact John VanLund for clarification. I have attached a copy of a memo from John.
cc: J. VanLund