Eng. & Tech. Journal, Vol.28, No.9, 2010 * College of Engineering , University of Al-Mustansiriya / Baghdad 1802 Effect of Cross Section Properties on Flat Plate Behavior Awadh O. Ajeel* Received on:22/10/2009 Accepted on:16/2/2010 Abstract On the wise of structural advantages of flat plate slab systems, the researches still deal with punching shear hazards and solution techniques for adopting a rational design comes from experimental investigations. Beside that there is a rapid development in production the high performance concretes using chemical additives and wide spectrum of different features fibers which avail additional options for the structural designers. The present work is an experimental study adopts the comparison between uniform concrete sections with specific strength and hybrid sections (consists of two different layers with different strength in the top half and the bottom one) to provide reinforced concrete flat plate slabs and conclude the more advantage option for improving their behaviors against eventual punching shear failure. Normal strength, high strength and fibrous concrete with (34, 48 and 21) MPa compressive strength respectively are used to produce the slabs in this study. The results revealed the preference of the high strength uniform section in improving the slab behavior besides increasing its ultimate load twice in comparison with a hybrid section contains high strength concrete at the top half only and there is no advantage from increasing the tension zone strength on the hybrid section slab behavior except the ductility. Keywords: flat plate, punching shear, uniform section, hybrid section. ﺍﻟﻤﺴﺘﻭﻴﺔ ﺍﻟﻠﻭﺤﺔ ﺴﻠﻭﻙ ﻋﻠﻰ ﺍﻟﻌﺭﻀﻲ ﺍﻟﻤﻘﻁﻊ ﺨﻭﺍﺹ ﺘﺄﺜﻴﺭ ﺍﻟﺨﻼﺼﺔ ﺍﻷﺒﺤﺎﺙ ﻻﺘﺯﺍل ﺍﻟﻤﺴﺘﻭﻴﺔ، ﺍﻷﻟﻭﺍﺡ ﺒﻼﻁﺎﺕ ﻟﻤﻨﻅﻭﻤﺎﺕ ﺍﻹﻨﺸﺎﺌﻴﺔ ﺍﻟﻤﺯﺍﻴﺎ ﺼﻌﻴﺩ ﻋﻠﻰ ﻤﻘﺒﻭل ﺒﺘﺼﻤﻴﻡ ﺍﻟﺨﺭﻭﺝ ﻟﻐﺭﺽ ﻤﻌﺎﻟﺠﺘﻪ ﻭﺴﺒل ﺍﻟﺜﺎﻗﺏ ﺍﻟﻘﺹ ﻤﺨﺎﻁﺭ ﺒﺨﺼﻭﺹ ﻤﺴﺘﻤﺭﺓ ﺍﻟﻌﻤﻠﻴﺔ ﺍﻟﺘﺠﺎﺭﺏ ﻋﻠﻰ ﺍﻋﺘﻤﺎﺩﺍﹰ. ﻭﺇ ﻋﺎﻟﻴﺔ ﺍﻟﺨﺭﺴﺎﻨﺎﺕ ﺇﻨﺘﺎﺝ ﻓﻲ ﺍﻟﺴﺭﻴﻊ ﺍﻟﺘﻁﻭﺭ ﻓﺈﻥ ﺫﻟﻙ ﺠﺎﻨﺏ ﻟﻰ ﻴﻭﻓﺭ ﺍﻟﻤﺘﺒﺎﻴﻨﺔ ﺍﻟﺼﻔﺎﺕ ﺫﺍﺕ ﺍﻷﻟﻴﺎﻑ ﻤﻥ ﻭﺍﺴﻊ ﻭﻁﻴﻑ ﺍﻟﻜﻴﻤﻴﺎﺌﻴﺔ ﺍﻟﻤﻀﺎﻓﺎﺕ ﺒﺎﺴﺘﺨﺩﺍﻡ ﺍﻷﺩﺍﺀ ﺍﻹﻨﺸﺎﺌﻴﻴﻥ ﻟﻠﻤﺼﻤﻤﻴﻥ ﺇﻀﺎﻓﻴﺔ ﺨﻴﺎﺭﺍﺕ. ﺫ ﻤﻭﺤﺩﺓ ﻟﻤﻘﺎﻁﻊ ﺍﻟﻌﻤﻠﻴﺔ ﺍﻟﻨﺘﺎﺌﺞ ﺒﻴﻥ ﺍﻟﻤﻘﺎﺭﻨﺔ ﻤﺒﺩﺃ ﻋﻠﻰ ﺍﻟﺤﺎﻟﻴﺔ ﺍﻟﺩﺭﺍﺴﺔ ﺘﻌﺘﻤﺩ ﻤﻘﺎﻭﻤﺔ ﺍﺕ ﻹﻨﺘﺎﺝ ﺍﺴﺘﺨﺩﻤﺕ ﻭﺍﻷﺴﻔل ﺍﻷﻋﻠﻰ ﺍﻟﻨﺼﻔﻴﻥ ﺒﻴﻥ ﺍﻟﻤﻘﺎﻭﻤﺔ ﻓﻴﻬﺎ ﺘﺨﺘﻠﻑ ﻤﻬﺠﻨﺔ ﻭﻤﻘﺎﻁﻊ ﻤﻌﻴﻨﺔ ﻟﺘﺤﺴﻴﻥ ﺍﻷﻓﻀل ﺍﻟﺨﻴﺎﺭ ﺍﺴﺘﻨﺘﺎﺝ ﻟﻐﺭﺽ ﻤﺴﺘﻭﻴﺔ ﺃﻟﻭﺍﺡ ﻫﻴﺌﺔ ﻋﻠﻰ ﻤﺴﻠﺤﺔ ﺨﺭﺴﺎﻨﻴﺔ ﺒﻼﻁﺎﺕ ﺍﻟﺜﺎﻗﺏ ﺍﻟﻘﺹ ﻓﺸل ﺘﺠﺎﻩ ﺍﻟﺒﻼﻁﺎﺕ ﺘﻠﻙ ﺴﻠﻭﻙ. ﻋﺎﻟﻴﺔ ﻭﺨﺭﺴﺎﻨﺔ ﺍﻋﺘﻴﺎﺩﻴﺔ ﺨﺭﺴﺎﻨﺔ ﺍﺴﺘﺨﺩﻤﺕ ﻭ ﺍﻟﻤﻘﺎﻭﻤﺔ ﻗﻴﻤﺘﻬﺎ ﺇﻨﻀﻐﺎﻁ ﺒﻤﻘﺎﻭﻤﺔ ﻟﻴﻔﻴﺔ ﺃﺨﺭﻯ) 34 ، 48 ﻭ21 ( ﻨﺕ/ ﻤﻠﻡ2 ﻓﻲ ﺍﻟﺒﻼﻁﺎﺕ ﻹﻨﺘﺎﺝ ﺍﻟﺩﺭﺍﺴﺔ ﻫﺫﻩ. ﺴﻠﻭﻙ ﺘﺤﺴﻴﻥ ﻓﻲ ﺍﻟﻌﺎﻟﻴﺔ ﺍﻟﻤﻘﺎﻭﻤﺔ ﺫﺍﺕ ﺍﻟﻤﻭﺤﺩﺓ ﺍﻟﻤﻘﺎﻁﻊ ﺃﻓﻀﻠﻴﺔ ﺍﻟﻤﺨﺘﺒﺭﻴﺔ ﺍﻟﻨﺘﺎﺌﺞ ﻜﺸﻔﺕ ﺯﻴﺎﺩﺓ ﻤﻥ ﺍﻟﻤﺴﺘﺤﺼﻠﺔ ﺍﻟﺯﻴﺎﺩﺓ ﺒﻘﺩﺭ ﻤﺭﺘﻴﻥ ﺍﻷﻗﺼﻰ ﺍﻟﺒﻼﻁﺔ ﺤﻤل ﺯﻴﺎﺩﺓ ﺠﺎﻨﺏ ﺇﻟﻰ ﺍﻟﺒﻼﻁﺎﺕ ﺍﻟﺸﺩ ﻤﻨﻁﻘﺔ ﻤﻘﺎﻭﻤﺔ ﺯﻴﺎﺩﺓ ﻤﻥ ﻓﺎﺌﺩﺓ ﻓﻼ ﻭﻜﺫﻟﻙ ﺍﻟﻤﻘﻁﻊ ﻤﻬﺠﻨﺔ ﻟﻠﺒﻼﻁﺔ ﺍﻻﻨﻀﻐﺎﻁ ﻤﻨﻁﻘﺔ ﻤﻘﺎﻭﻤﺔ ﺍﻟﻤﻁﻴﻠﻴﺔ ﺨﺎﺼﻴﺔ ﺘﺤﺴﻴﻥ ﻋﺩﺍ ﻤﺎ ﻓﻲ ﺍﻟﻤﻘﻁﻊ ﻤﻬﺠﻨﺔ ﺍﻟﺒﻼﻁﺔ ﺘﺼﺭﻑ ﺘﺤﺴﻴﻥ ﻓﻲ. PDF created with pdfFactory Pro trial version www.pdffactory.com