[1] Univ Cadi Ayyad, Fac Polydisciplinaire Safi, Route Sidi Bouzid,BP 4162, Safi 46000, Morocco
[2] Univ Sharjah, Coll Engn, Dept Civil & Environm Engn, POB 27272, Sharjah, U Arab Emirates
[3] ENSA, Rue Beni Amir,BP 77, Khouribga, Morocco
[4] Univ Sharjah, Coll Sci, Dept Math, POB 27272, Sharjah, U Arab Emirates