الفهرس 
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Abstract
This thesis aimed to investigate the applicability of strengthening reinforced concrete (RC) beams using hybrid SHCC/steel plates. It studied experimentally and analytically the shear performance of reinforced concrete beams strengthed by hybrid SHCC/steel plates. The hybrid SHCC/ steel plates have been prepared, cured, and then used to strengthen shear-deficient reinforced concrete (RC) beams. The used hybrid SHCC/ steel plates have rectangular cross-sections of 100mm width and 20mm thickness made of strain-hardening cementitious composite (SHCC) material and reinforced with mild steel plates of 1 mm thickness having different reinforcement ratios (1.4, 2.8, and 4.2%). The motivation of using such reinforced composite plates is to make use of the mutual benefit between the used materials where the internal steel plate alleviates the cracks localization manifested by plain SHCC material after cracking, while the SHCC material protects the steel plates against corrosion. Experimental test results showed that the use of hybrid SHCC/ steel plates significantly increased the ultimate shear capacity of the strengthened beams. Besides, inclined configuration of the hybrid SHCC/ steel plates showed higher performance compared to that exhibited by vertical configuration from both the ultimate capacity and shear cracks characteristics viewpoints. Beam S3-P56-100-45,strengthened by inclined hybrid SHCC/ steel plates, showed the best performance. It exhibited about 126% increases in the ultimate capacity compared to the control unstrengthened beam. On the other hand, the corresponding increase of similar beam reinforced with vertical plates was about 88%.