1. Graduate Research Assistant, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado Boulder, 1111 Engineering Dr., Boulder, CO 80309 (corresponding author).
2. President Teaching Scholar and Beavers Endowed Professor of Construction Engineering, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado Boulder, 1111 Engineering Dr., UCB 428, Boulder, CO 80302.