الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 211 |  |  |
| | | from | 211 | | |
Abstract
The main purpose of this study is to investigate the behavior of R.C deep beam with web openings retrofitted by ferrocement laminates. Ferrocement as a retrofitting material can be useful because it can be applied quickly to the surface of the damaged element without the requirement of special bonding material and it requires less skilled labor, as compared to other retrofitting solutions presently existing.
To achieve this objective, a total of fifteen simply-supported deep beams were constructed with overall dimensions of 1000 mm length (800 mm clear span), 700 mm height, and 150 mm width. Three specimens were kept as reference specimens (un-strengthened specimens) and the remaining twelve beams were externally strengthened by ferrocement overlays with different strengthening schemes. The essential parameters that were considered include the number and the type of steel wire meshes, thicknesses of plastering mortar, mortar strength and the opening location. The experimental work confirmed that the behavior of RC deep beams with openings has been evidently improved by using ferrocement layer as a strengthening technique. The effect of the number of wire mesh and the mortar strength is essentially important to increase the first crack load, the ultimate load, and to develop the enhanced beam characteristics. It was observed that the ultimate load carrying capacity was reduced by 31% and 16% due to the existence of opening placed at the max shear and max flexural values respectively. The experimental results indicated that the load, ductility ratio and un-cracked stiffness of strengthened specimens with openings in the shear zone were increased by about 85%, 19%, and 65% of the un-retrofitted deep beam with holes respectively.
An analytical model has been carried out using strut and tie method to predict the load capacity of strengthened deep beams. Theoretical results have compared to experimental results obtained from the experimental one. the ultimate load of the theoretical model was in a good agreement with those observed from test results for specimens.