Behavior of Reinforced Concrete Frames with Different Beam-column Joints Types

摘要

The main aim of this investigation is to study the structural behavior of reinforced concrete frames. Four types of the beam-column joints were discussed in this investigation; One of the tested frames was poured monolithically that adopted as a reference specimen, two of specimens were poured monolithically with (0.5%) and (1%) of total volume steel fibers at the joints and the fourth specimen was poured with construction joint at the beam-column connection (non-monolithic way). The frames were geometrically similar, it contain two columns connected together by 120×120mm beam at top and by 120×200mm strip footing at the bottom of the columns. The ultimate carrying capacity, first crack load, ductility and stiffness were increased by about 5.2%, 16%, 27.5% and 18.98% respectively as a result of adding (0.5%) steel fibers at the concrete of joints. On the other hand, the ultimate carrying capacity, first crack load and stiffness were decreased by about 46%, 26.7%, 7% and 36.24% respectively as a result of pouring the frame specimen in non-monolithic way.