| Author(s) | Ahmed B. Shuraim |
| Affiliation | Department of Civil Engineering, College of Engineering, King Saud University, P. O. Box 800, Riyadh, 11421, Saudi Arabia |
| Title | Applicability of Code Design Methods to RC Slabs on Secondary Beams. Part II: Moment Variations |
| Source | Journal of King Saud University. Engineering Sciences. Volume 15, No 2. (2003/1423) |
| Abstract | Abstract. Reinforced concrete slabs on secondary beams differ from two-way slabs on beams in the fact that the latter has vertical supports at the intersection of the beams whereas the former does not. In the absence of specific code provisions for the former, it is usually designed in accordance with the provisions developed for the latter. The numerical distributions of moments over five beam-slab systems with different beam to slab depth ratios are examined to assess the applicability of relevant code provisions for design. Moments from the numerical analysis are employed to evaluate two assumptions. First, the secondary beams are assumed rigid, and hence making the beam-slab systems similar to two-way slab on beams. Second, the secondary beams are assumed flexible, hence the systems are considered as single panels. The former representation shows that the error exceeds 200 % in positive bending moments. This means that slab on secondary beams should not be treated as the traditional two-way slab on beams. The latter representation shows that the beam-slab systems essentially behave as single panels. Accordingly, treating the entire floor as a single panel seems to be an essential element in devising a design methodology for this type of construction. Keywords: Reinforced concrete slabs, Design methods, Secondary beams, Beam-slab systems, Mathematical modeling, Codes of practice. |
