1. Professor and L. B. Ryon Chair in Engineering, G. R. Brown School of Engineering, Rice Univ., Houston, TX 77005; presently, Changjiang Chair, Tongji Univ., Shanghai 200092, China.
2. Postdoctoral Research Fellow, Dept. of Civil Engineering, Energy, Environment and Materials (DICEAM), Mediterranea Univ. of Reggio Calabria, Reggio Calabria 89124, Italy (corresponding author).