الفهرس | Only 14 pages are availabe for public view |
Abstract Shear forces are among the most dangerous and important forces that must be taken into account when designing concrete beams. Experimental program and numerical analysis have been conducted in order to study the effect of using some shear systems in improving the shear resistance. These systems have been classified into reinforcing steel system (stirrups and bentup bars) and strengthening plates system (steel plates, CFRP plates and UHPFRC plates). Fruitful results were obtained from the study. Although the spiral stirrups system gives better shear resistance than the vertical stirrups system, the performance difference is not sufficiently satisfactory. The inclined stirrups and bent-up bars systems give a significantly higher performance more than the vertical stirrups system (the increase in the shear resistance is about one-fifth). Condensing the stirrups at the shear zone increases the shear resistance by about one-third. Strengthening the maximum shear stresses zone in the beam with 10cm width plate (steel plate, CFRP plate and UHPFRC plate) increases the shear resistance by about 37%, 30%, and 26%, respectively. Strengthening the shear stresses zone in the beam with 39cm width plate (steel plate, CFRP plate and UHPFRC plate) increases the shear resistance by about 77%, 61%, and 77%, respectively. Strengthening the entire span of the beam with (steel plate, CFRP plate and UHPFRC plate) increases the shear resistance by about 95%, 61% and 100%, respectively. |