ResearchBib Share Your Research, Maximize Your Social Impacts
Sign for Notice Everyday Sign up >> Login

CFRP Strengthening Of Concrete Slabs With And Without Openings

Journal: International Journal of Scientific & Technology Research (Vol.4, No. 8)

Publication Date:

Authors : ; ;

Page : 132-146

Keywords : Index Terms Reinforced Concrete Two-way slab; High Strength Concrete; One central Opening; Two Opening in the Middle Strip; uniformly distributed load; CFRP Sheets.;

Source : Downloadexternal Find it from : Google Scholarexternal

Abstract

Abstract This paper presents an experimental investigation of reinforced concrete slabs with openings and strengthened with CFRP sheets all slabs tested under uniformly distributed load with simply supports on the four edges by using high strength concrete. The experimental work includes testing of sixteen reinforced concrete slab specimens with dimensions 1050x1050 mm and 80 mm depth as well as a series of tests carried out on construction materials. These slabs were arranged in group 1 to 6 where specimen group 1 is slab without openings and without strengthening all other remaining groups contained three specimens with opening in the middle strip one specimen was unstrengthened and the others were strengthened with CFRP sheets using two different schemes. The experimental work also includes studying the existence of a square opening in the center of slab group 2 and comparing the division of one square opening into two square opening so the total area of them was equal to the area of one square opening in group 2. These opening were placed within the middle strip of slab group 3 was central converging opening center of the middle strip and group 4 was central diverging opening on the side of the middle strip but group 5 and 6 are represented slabs with two opening in the middle strip converging and diverging respectively. Experimental results showed that the presence of the openings the unstrengthened specimens showed a decrease in ultimate load capacity between 20.3 - 29.6 with respect to the control solid slab especially slabs with two converging opening showed a significant decrease in ultimate load capacity. On the other hand the test results clearly demonstrated that the use of CFRP depends on the strengthening scheme which leads to a significant improvements by 33.3 - 87.5 in the cracking load and 26.2 - 55.1 in the ultimate load compared with unstrengthened slab with opening. The experimental tests also showed the slab specimen with two diagonal diverging opening and strengthening with CFRP by second scheme leading to the best results in cracking load by 36.4 and ultimate load 21.8 as compared with the control solid slab.

Last modified: 2015-11-13 18:32:12