1. Professor, Dept. of Architectural Engineering, Pennsylvania State Univ., 104 Engineering Unit A, Univ. Park, PA 16802 (corresponding author).
2. Structural Engineer, Walker Parking Consultants, Elgin, IL.
3. Research Associate, Dept. of Architectural Engineering, Pennsylvania State Univ., University , PA.
4. Charles and Elinor Matts Professor, Dept. of Architectural Engineering, Pennsylvania State Univ., University, PA.