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Abstract The author wishes to express his sincere gratitude and appreciation to Dr. Ibrahim Mahfouz M. Ibrahim, Professor and Head Department of Civil Eng., Zagazig University, Banha Branch, shoubra, for his guidance and valuable suggestions during this research work. The author also wishes to express his sincere gratitude and appreciation to Dr. Mostafa Kamel Zidan, Associate Professor of Structural Eng., Faculty of Eng., Ain Shams University, for his constant assistance during courses and research work of this thesis. The author wishes to express his sincere gratitude and appreciation to Dr. Amin Saleh Aly, Associate Professor of Structural Eng., Faculty of Eng., Ain Shams University, for his precious advice and constant assistance and encouragement throughout this research work. Thanks are also due to author’s El-mahdy and Ashraf Abd-alaa, for preparing the final shape of this friends, their thesis. author wishes to thank Mr. Ismail Aly for drawings of this work. Engs. Osama assistance in Finally, the producing the |