1. Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, 1 University Station C1761, Austin, TX 78712-0278.
2. Department of Civil and Environmental Engineering, Arizona State University, Room ECG252, Tempe, AZ 85287-5306.
3. ETH Zurich, IVT ETH, Honggerberg, HIL F 32.3, Wolfgang Pauli Strasse 15, 8093, Zurich, Switzerland.