Flexural Cracking of Concrete Flat Plates


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Title: Flexural Cracking of Concrete Flat Plates

Author(s): Jan C. Jofriet

Publication: Journal Proceedings

Volume: 70

Issue: 12

Appears on pages(s): 805-809

Keywords: concrete slabs; crack width and spacing; crack-ing (fracturing); flat concrete plates; flexural strength; ser-viceability; structural design.

Date: 12/1/1973

Serviceability of concrete flat plates is examined. It is shown that the high negative moments that occur in the vicinity of the support columns may lead to excessively wide cracks and high local steel stresses if the negative column strip reinforcement is evenly distributed over the width of the column strip. A design check on serviceability is difficult to carry out unless the magnitude of the actual service load moments is known. It is suggested that a code provision that requires twice as much top steel to be placed in the center half than in the remaining part of the column strip region would enhance the serviceability performance of concrete flat plates.