A Study of Post-Tensioned Precast Beam-Column Joints

• Main Authors: Chien Hsun Huang, 黃建勳
• Other Authors: S.J. Hwang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/69827241885384720033

碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === In this research, five reinforced concrete specimens with or without energy dissipating devices were tested to study the energy dissipating capacity and the damage of concrete. Three exterior joint specimens LPTC, HPTC and HPTC-M used steel plates as the energy dissipating device. Interior joint specimen PTC had different lateral steel configurations for the left and right connected beams. Another interior joint specimen Hybrid PTC used partially unbonded mild steel bars as the energy dissipating device. The RC column dimensions were 650×650 mm and the RC beam dimensions were 500×600 mm. The spacing of lateral reinforcement #4 was 100mm in the region of beam-column joint to avoid shear failure. The ends of columns were held with actuators to simulate hinge ends. The force was applied to beam ends under displacement control. The displacement followed a cyclic loading history from small drift levels to large drift levels. The energy dissipating devices suggested in this research can be used in the unbonded post-tensioned precast reinforced concrete beam-column joints and the specimens performed good self-centering ability and good energy dissipating ability. The steel plates used to protect the contact surfaces of beam-column joints caused the concrete only had minor cracks. The steel plates used as energy dissipators need special cares to prevent their buckling and sliding.