الفهرس 
Preliminary Analytical StudyOnly 14 pages are availabe for public view
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Abstract
The vast majority of R.C. bridges are constructed above overcrowded roads, so the construction works lead to the aggravation of the traffic congestion. Hence, the more construction time taken the more traffic congestion with its side effects on the national income and public health will be.
This research investigates the behavior and design of two types of pocket connections between circular precast columns and foundations with smooth and rough surface interface. For this type of connection, the applied loads can transfer by bearing and friction without reinforcement splice. The studied connection are subjected to vertical load, horizontal load and bending moment.
The experimental program included the testing of two types of pocket connection specimens (partially embedded - external) with smooth and rough interface. Three specimens with smooth surface, three specimens with rough surface and one control (monolithic) specimen. The specimens were subjected to simultaneous vertical and horizontal loads up to failure from different points of view (cracking load, deformational behavior, joint rotation, ductility, ultimate capacity, failure mode and fixation point at pocket).
The embedded length to column diameter ratio was 2 and 1.33 for smooth specimens, and it was 1.6 and 1.067 for rough specimens.
The experimental observations and results show the effect of the variation of total embedded depth, external stiffener depth on the behavior of the introduced connection with smooth and rough surface interface.
Strut and tie models were developed to simulate the behavior of all connections.