الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Fixing new fresh concrete beam to an existing column is considered an important practical investigation work in repair and strengthen field. The relation between the non-monolithic action of the beam-column joints and the shear capacity is dependent on the mechanisms of load transfer between the two interfaces. The bond between the two different age concrete is controlled by the surface preparation forms of the beam -column joints which considered one of the mechanisms of load transfer between the two interfaces. This research study investigated the surface preparation effect of the non-monolithic beam-column joints with shear strength capacity of frame structure. The investigated parameters were, the surface roughness degree, the effect of fabrication a part inside the existing column reaching to the column reinforcement and the effect of using epoxy. The program investigated six non-monolithic frame samples which represented the different cases of joint preparation form techniques in addition to, a monolithic frame sample as a reference. The test results indicate that, the shear resistance of the non-monolithic joints is influenced by the degree of fixation obtained from each technique. Also, the shear resistance of the non-monolithic frames increases when surface roughness increase. The epoxy resin is also considered one of shear resistance sources which increase the joint shear capacity as test results clarified. The experimental work investigated the case of fabricating a part (column cover removal) inside the precast column which get higher increase in shear resistance among all samples. The experimental program recommended the case of creating a part inside the precast column with adding epoxy resin painted along the contact surface between the two interfaces as an optimum technique to get higher shear resistance of the non-monolithic beam-column joints action. The test program results also recorded the shear resistance of the different studied technique compared to the monolithic case.