Ribbed - Ribbed(Waffle)SlabSystem .Theyareeither

Info icon This preview shows pages 1–2. Sign up to view the full content.

Ribbed (Waffle) Slab System Waffle Slab Construction Ribbed floors consisting of equally spaced ribs are usually supported directly by columns.They are either  one-way spanning systems known as ribbed slab or a two-way ribbed system known as a waffle slab.  This form of construction is not very common because of the formwork costs and the low fire rating. A  120-mm-thick slab with a minimum rib thickness of 125 mm for continuous ribs is required to achieve a 2- hour fire rating. A rib thickness of greater than 125 mm is usually required to accommodate tensile and  shear reinforcement. Ribbed slabs are suitable for medium to heavy  loads , can  span reasonable  distances, are very stiff and particularly suitable where the soffit is exposed. Slab depths typically vary from 75 to 125 mm and rib widths from 125 to 200 mm. Rib spacing of 600 to  1500 mm can be used. The overall depth of  the floor  typically varies from 300 to 600 mm with overall  spans of up to 15 m if reinforced, longer if post-tensioned. The use of ribs to the soffit of the slab reduces  the quantity of concrete and reinforcement and also   the  weight of  the floor . The saving of materials will be  offset by the complication in formwork and placing of reinforcement. However, formwork complication is 
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Winter '15
  • Finance, 200 mm, 100mM, 15 m, 375mm, 475mm

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern