[1] Univ Washington, Dept Civil & Environm Engn, 201 More Hall,POB 352700, Seattle, WA 98195 USA
[2] Univ Washington, Dept Civil & Environm Engn, 121H More Hall,POB 352700, Seattle, WA 98195 USA
[3] Univ Texas Austin, Cockrell Sch Engn, Dept Civil Architectural & Environm Engn, 301 E Dean Keeton St Stop C1700, Austin, TX 78712 USA