Force transfer of the floor slab in a post-tensioned concrete 3D frame under two-directional lateral loads

• Main Authors: Xin-Hong Chen, 陳信宏
• Other Authors: Chin-Tung Cheng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/60636608424063931171

碩士 === 國立高雄第一科技大學 === 營建工程所 === 96 === The precast and prestressed concrete structural systems utilize unbonded post-tensioned to connect beams and columns together. The structure may return to its original position without residual deformations due to the prestress under earthquake loads (self-centering function). However, floor slabs designed as a rigid diaphragm may reduce the gap-opening in the beam-column interface in practice. Therefore, it is necessary to investigate the force transfer of the slabs in the precast and prestressed concrete structural system. This research aims to invertigate the force transfer of the floor slabs in the precast and prestressed concrete structure under bi-axial loads. For this purpose, a 3D one story sub-structure was constructed, including four columns, four beams and two slabs to form a gravity frame, a post-tensioned frame and slabs in between. In order to simulate the path of force transfer of inertial load during an earthquake, the lateral loads was applied at the column of the gravity frame and then transmitted to the post-tensioned frame through the floor slabs and transverse beams, where prestress was also applied to have self-centering function without interfering the gap-opening in the beam-column interface. The primary invertigating parameters are the prestress level in the slabs and transverse beams. Test results showed that the sub-structural remained elastic all the time without major damage restored its function after eachtest and returned to its original position without residual deformations.