1. Assistant Professor, Civil Engineering Dept., FayoumUniv., Kiman Fars, Fayoum 63514, Egypt (corresponding author).
2. Associate Professor, Civil Engineering Dept., Fayoum Univ., Kiman Fars, Fayoum 63514, Egypt.
3. Professor, Dean of Engineering, Structural Engineering Dept., Cairo Univ., EL-Gamaa St., Giza 12613, Egypt.