1. Department of Civil and Environmental Engineering, University of California Irvine, Irvine, USA
2. Department of Structural Engineering, University of California-San Diego, La Jolla, CA, 92093-0085, USA
3. Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology, Tehran, Iran
4. Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran