الفهرس 
USE OF SCC FOR CONJESTED SECTIONSOnly 14 pages are availabe for public view
 |  | from | 254 |  |  |
| | | from | 254 | | |
Abstract
The construction of modern buildings needs to accommodate essential facility services and installation works. That entails providing web openings in reinforced concrete beams. from the structural viewpoint, beams with web openings experience great losses of load-carrying capacity depend on their size and location. In this thesis, the behavior of beams with openings is investigated in terms of load-deflection, crack pattern and stress distribution. In addition to solid reinforced concrete (RC) beam, four different groups have been experimentally tested up to complete failure. These groups included RC beams with different openings size, strengthened RC beams having web openings by using CFRP laminates, strengthened RC beams having web openings by using steel plates & angels and rehabilitated beams using Engineering Cementitious Composites (ECC) material. For this purpose, thirteen RC beam specimens have been cast; one control solid specimen, three specimens with different web opening sizes, while the remaining specimens were strengthened / rehabilitated perforated RC beams using different techniques. Self-compacted concrete has been used in order to avoid honey cambering and to facilitate casting. Steel angles, steel plates, CFRP strips, CFRP wrapping and Engineering Cementitious Composites (ECC) have been used for the applications of strengthening / rehabilitation for perforated beam specimens. The study indicated that, the sharp edges of the rectangular perforations induced high stress concentration that caused shear failure at the first web-post in the perforated beams. Besides, the results highlighted the highest efficiency of using relatively ECC thickness followed by hybrid steel plating techniques. Finally, liner elastic finite element simulation has been performed in order to determine the internal load transfer mechanism and to assess the stress concentrations at the opening corners. Furthermore, simplified vierendeel analysis was found to be an appropriate tool for the study cases.