CORRUGATED BAR COMPANY, 



FLAT SLAB TABLES 



CORR-PLATE FLOORS 



(patented) 



Flat slab floors, or floors in which beam elements are omitted and the slab 

 supported directly on the columns, are the result of the ever-present demand for 

 eflBciency and economy of construction, particularly for buildings in the warehouse 

 and industrial group. This demand has been met by numerous "systems" of flat 

 slab floors, each reflecting the ideas of the designer as to the distribution of the 

 reinforcement; some approaching the ideal distribution and still others varying widely 

 from the mark. 



The Corrugated Bar Company, Inc., has developed through its research and labo- 

 ratory work, accompanied by field tests, a method of design and a system of steel 

 distribution which it is believed meets the conditions of the problem in the most 

 logical manner. This construction is known as Corr-Plate — a flat slab reinforced in 

 two directions in such manner as to conform to the variation in moment that exists in 

 a flat plate on point supports when subjected to load, and for which is claimed the 

 following engineering advantages: 



(a) That it can be accurately designed. 



(b) That the arrangement of reinforcement in two directions, parallel to the sides 

 of the panel, is the best arrangement to meet the stress distribution as observed in 

 laboratory and field tests. 



(c) That the steel distribution adopted varies with the bending moment, being 

 heaviest at the panel margin and gradually decreasing toward mid-panel. 



(d) That having no more than two layers of reinforcement at any one point the 

 length of arm of the moment couple at any section is the greatest possible, thus afford- 

 ing maximum strength and stiffness for a given thickness of concrete. 



(e) The factor of safety being substantially uniform throughout, there results a 

 saving in quantity of concrete and reinforcement. 



Aside from the specific advantages claimed for Corr-Plate Floors, flat slab con- 

 struction in general appeals to the owner and builder from the economic and service 

 standpoint. The advantages may be summed up in the following brief paragraphs: 



(a) No beams or girders. This means saving in forms and by virtue of the flat 

 ceiling, greater economy in the installation of the sprinkler system. 



(6) Saves space. From one to one and a half feet of actual free space is gained in 

 every story. This may amount to a story height in every eight, depending upon the 

 standard of ceiling heights used in the building. The reduction in total height of 

 building means a saving in walls, columns, piping, stairways, elevator structure and 

 in every item in a building that is affected by a change in story height. 



(c) Better light and ventilation. There are no beams to cast shadows or interfere 

 with a thorough diffusion of light. Flat ceilings remove all obstacles to the free move- 

 ment of air currents and to that extent assist in maintaining uniform conditions as to 

 temperature, humidity and the removal of vitiated air. 



(d) Better fire protection. The damage a concrete building sustains by fire bears 

 a direct relation to the number of corners exposed to the action of heat and water. 

 In this respect it is clear that the beamless floor has a decided advantage over the beam 



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