Abstract
In this research, an experimental study is conducted to investigate the behavior and strength of high strength reinforced concrete corbels externally bonded with CFRP fabric sheets and Plates with different patterns taking into account the effect of adopted variables in enhancing the ultimate strength; the effect of shear span to effective depth (a/d), configuration, type and amount of bonding. Eleven high strength reinforced corbels were cast and tested under vertical loads. Test results showed there was an improvement in the behavior and load carrying capacity of all strengthened corbels. An increasing in the ultimate strength of strengthened corbel by inclined CFRP strips reached to (92.1%) while the increasing reached to (84.21%) for using one horizontal CFRP Plates compared to un-strengthened reference specimen. Also, it can be conducted that the increase of (a/d) ratio from (0.6 to 0.8) resulted in decreasing by 21.05% in ultimate load capacity of corbels and from (0.4 to 0.6) by 31.25% and 58.69% in cracking and ultimate loads respectively.
Highlights
Corbels are structural members which are commonly used in reinforced concrete structures and in precast structures [1]
The experimental program included testing of eleven high strength reinforced concrete corbels subjected to vertical loads only .The work is divided into two parts; the first part consists of three un-strengthened specimens tested with varied a/d ratio (0.6,0.4, 0.8),while the second part includes strengthening of corbels with Carbon Fiber Reinforced Polymer (CFRP) fabric sheets and plates
(50mm) width diagonal mirrored of angle 45o CFRP plate on two opposite faces of corbel only, while specimens as shown in Fig.3. (CON1, CON2, CON3) were kept without strengthening to study the effect of shear span to effective depth ratio (a/d), CON1 was considered as control corbel for comparison
Summary
Corbels are structural members which are commonly used in reinforced concrete structures and in precast structures [1] They are short cantilevers with shear span to effective depth ratio lower than one, generally built monolithically with columns or walls [2]. The test results show increase in ultimate and cracking loads for strengthened and repaired specimens with CFRP strips [14]. Six of them under monotonic and fourteen under non-reversed repeated loads to study strengthening with CFRP strips. The results obtained that strengthening increasing the cracking and failure loads in addition to the ultimate deflection for the monotonically and the non-reversed repeated loaded [15]
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