STRUCTURAL DESIGN OF A RIBBED SLAB AND CRITICAL COMPARISION WITH THE SOLID TYPE.

 ABSTRACT

          Analysis and structural design of a ribbed slab is done using the principles of flanged sections and it is     compared with the conventional solid slab floor and observed closely.

          It was found that, ribs are very efficient, structurally stable, economically good and highly effective where thermal and acoustic insulation are required. It is recommended for light loaded structures, high rise buildings and where large spans are needed such as: residential buildings, hospitals etc, but should not be used in heavily loaded structures like industrial buildings, warehouses, etc.

 INTRODUCTION

 

Ribbed Slab

          This is a very efficient form of slab construction, it is also called a Hollow block / voided slab or pan joist system.

          The main advantage of the ribbed floor is the reduction of the quantity of concrete and hence the considerable savings in the cost. It may be considered as a T – beam in which the space between the tees or the ribs are kept hollow or filled with a lighter structural material and the top contains light concrete. The weight of the structure is reduced considerably and at the same time heat and sound insulation are provided.

 Code Requirements
 

The thickness of the topping of a ribbed slab is kept from 50mm to 80mm.

The width of the ribs should not be less than 65mm

The spacing between the ribs should not be greater than 1.5m c/c. the actual clear spacing depends upon the size of the hollow blocks available, but it should not normally exceed 12 times the thickness of the slab.

The overall depth of the ribbed slab should not exceed 4 times the width of the slab.

The diameter of the bar used in ribbed slab should not be more than 22mm

 Analysis of Flanged Section
 

•Floor systems with slabs and beams are placed in monolithic pour.

•Slab acts as a top flange to the beam;    T-beams, and Inverted L(Spandrel) Beams.

REFERENCES 

  Garber, G. Design and Construction of Concrete Floors. 2nd ed. Amsterdam: Butterworth-Heinemann, 2006. 47. Print.

 Duncan, Chester I. Soils and Foundations for Architects and Engineers. New York: Van Nostrand Reinhold, 1992. 299. Print.

 

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