Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental studies on reinforced concrete interior beam-column joints strengthened by unsymmetrical chamfers
Highlights Unsymmetrical chamfers are effective to protect BCJ against failure at joint core. Loading capacity of BJC is increased by over 30% after installing 300 mm chamfers. Failure mode is shifted from joint-shear to column-flexure after strengthening. The chamfer size is more crucial compared with reinforcement providing in chamfer.
Abstract Beam-column joints (“BCJ”) are critical members in low-rise to mid-rise buildings. Failure of BCJ may lead to collapse of building. To strengthen non-seismically designed BCJ, a comprehensive study has been commissioned to develop a strengthening strategy for BCJ using unsymmetrical chamfers. Specifically, chamfers are proposed to be installed at beam-column corners and under the soffit only to alleviate the undesirable joint-shear failure. Tests were carried out on four 2/3-scale BCJ, comprising one control specimen and three strengthened specimens including 300 mm chamfers with and without U-bars and 150 mm chamfers with U-bars. The specimens were subjected to moderate level of axial load and loaded to failure under quasi-static cyclic loading. It has been shown that unsymmetrical chamfers are effective to protect a non-seismically designed BCJ against failure at joint core. Mode of failure is shifted from joint-shear in the control specimen to column-flexure in the strengthened specimens. To enhance the performance of BCJ, size of chamfer is more crucial in comparison with providing reinforcements inside the chamfers.
Experimental studies on reinforced concrete interior beam-column joints strengthened by unsymmetrical chamfers
Highlights Unsymmetrical chamfers are effective to protect BCJ against failure at joint core. Loading capacity of BJC is increased by over 30% after installing 300 mm chamfers. Failure mode is shifted from joint-shear to column-flexure after strengthening. The chamfer size is more crucial compared with reinforcement providing in chamfer.
Abstract Beam-column joints (“BCJ”) are critical members in low-rise to mid-rise buildings. Failure of BCJ may lead to collapse of building. To strengthen non-seismically designed BCJ, a comprehensive study has been commissioned to develop a strengthening strategy for BCJ using unsymmetrical chamfers. Specifically, chamfers are proposed to be installed at beam-column corners and under the soffit only to alleviate the undesirable joint-shear failure. Tests were carried out on four 2/3-scale BCJ, comprising one control specimen and three strengthened specimens including 300 mm chamfers with and without U-bars and 150 mm chamfers with U-bars. The specimens were subjected to moderate level of axial load and loaded to failure under quasi-static cyclic loading. It has been shown that unsymmetrical chamfers are effective to protect a non-seismically designed BCJ against failure at joint core. Mode of failure is shifted from joint-shear in the control specimen to column-flexure in the strengthened specimens. To enhance the performance of BCJ, size of chamfer is more crucial in comparison with providing reinforcements inside the chamfers.
Experimental studies on reinforced concrete interior beam-column joints strengthened by unsymmetrical chamfers
Lam, Eddie Siu-shu (Autor:in) / Li, Bo (Autor:in) / Xue, Zhi-hang (Autor:in) / Leung, Kwok-tung (Autor:in) / Lam, Jeffery Yuet-kee (Autor:in)
Engineering Structures ; 191 ; 575-582
26.03.2019
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Behaviour of Strengthened Reinforced Concrete Beam-Column Joints
| British Library Conference Proceedings | 1995