Behaviour of R.C. beams in which the reinforcement not embedded in concrete in tension zone using fiber

from experimental and numerical study of tested beams, the following conclusions and -recommendations are drawn: -(1) The maximum load, which the beams resisted, \vas increased from . (104% to 109%) of reference beams, with changing the exposed length from (OAL to 0.8L).Il. (2) The maximum .deflection of beams was increased with changing. the exposed length from (0.4L to 0.8L).(3) Increasing the transverse reinforcement ratio in the supporting zone will increase the maximum load that the beam resisted from (104% to 108%) for group 3, (104% t0114%) for group 2 and (122% to 142.8%) for group 1.( 4) Increasing the transverse reinforcement ratio in the supporting zone will decrease the maximum deflection of beams from(100% to 92%).(5) The ulti111ate effect of increasing the transverse reinforcement ratio in the supporting zone \vill be most clear in beams with 111axi111Um exposed length.(6) Unbonded beams sho\v a higher ductility than similar bonded beams, \vhere unbonded beams were failed in ductile mode,~”~,but similar bonded beams failed in brittle mode.(7) End detail of flexural reinforcement in the supporting zQne of (B)( -.-J ) shape increase the ultimate load carrying capacity than (A)( ---, ) shape and (C)(- ) shape from (102% to 105%).(8) Changing the shear span-to-depth ratio of the tested beams effects on the maximum load \vhich the beam resisted where the maximum load for beam with (a/ d= 1.62) is greater than (a/d=2.27 and 3.35).(9) The ultimate effect of increasing the number of the transverse reinforcement in the supporting zone \vill be most clear in beams with minimum shear span-to-depth ratio.(10) The volumetric ratio of polypropylene fiber has a insignificant effect on the maximum load but increase the ductility of tested beams and increase initial crack load.