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In this study, two types of connecting method were suggested for modularized internally confined hollow reinforced concrete (ICH RC) beams. To evaluate their performances, bending tests were carried out with a single-body specimen and two modular specimens. The two modular specimens have different connections which are distinguished with the shapes of sheath tube and the existence of connecting steel plates. The four points loading tests were performed to investigate the behavior of the modular specimens and their failure patterns. The test results showed that modular specimens have lower strengths than the single-body specimen in the elastic region, but the modular specimens finally exerted almost equal strengths to the single-body specimen at the plastic region. The maximum loads of the modular specimens were measured as 90%~95% of the single body specimen. Those experimental results are supposed by the discontinuity of the concrete at the joint and the fracture of the reinforced coupler. If these defects are reinforced, a modular ICH RC structure may show similar behavior to a single-body ICH RC structure.

An Experimental Study on the Behavior of Modularized Internally Confined Hollow Reinforced Concrete Beam Joints