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Earthquakes and Structures
  Volume 3, Number 1, January 2012, pages 37-57

Seismic behavior of interior RC beam-column joints with additional bars under cyclic loading
Xilin Lu, Tonny H. Urukap, Sen Li and Fangshu Lin

    The behavior of beam-column joints in moment resisting frame structures is susceptible to damage caused by seismic effects due to poor performance of the joints. A good number of researches were carried out to understand the complex mechanism of RC joints considered in current seismic design codes. The traditional construction detailing of transverse reinforcement has resulted in serious joint failures during earthquakes. This paper introduces a new design philosophy involving the use of additional diagonal bars within the joint particularly suitable for low to medium seismic effects in earthquake zones. In this study, ten full-scale interior beam-column specimens were constructed with various additional reinforcement details and configurations. The results of the experiment showed that adding additional bars is a promising approach in reinforced concrete structures where earthquakes are eminent. In terms of overall cracking observation during the test, the specimens with additional bars (diagonal and straight) compared with the ones without them showed fewer cracks in the column. Furthermore, concrete confinement is certainly an important design measure as recommended by most international codes.
Key Words
    reversed cyclic loading; beam-column joint; plastic hinge; additional diagonal bars; displacement ductility; column shear force; crack propagation
Xilin Lu: State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China

Tonny H. Urukap, Sen Li and Fangshu Lin: College of Civil Engineering, Tongji University, Shanghai, China

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