1. Department of Civil Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Kurdistan, Iran
2. Faculty of Civil Engineering, University of Tabriz, 29 Bahman Blvd., Tabriz 51666, East Azerbaijan, Iran
3. Civil Engineering Department, University of Qom, Qom, Iran
4. The Transtec Group Inc., University of Texas at El Paso Austin, El Paso, TX 78731, USA