1. Graduate Research Assistant and Ph.D. Student, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado at Boulder, Boulder, CO 80309.
2. Assistant Professor, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado at Boulder, Boulder, CO 80309 (corresponding author).
3. Associate Professor, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado at Boulder, Boulder, CO 80309.