The anchorage contact stiffness identification and the tension test principle of vertical finishing prestressed reinforced bars
Zhong Xingu Zhao Chao Lin Chen Shu Xiaojuan Shen Mingyan Hu Tao
Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control, Hunan Science and Technology University, Xiangtan 411201, China
Abstract：Considering that the anchoring force is transferred through the contact between the prestressed anchor and prestressed anchor plate, and the normal contact stiffness and bending stiffness of nuts are in proportion to the anchoring force, a new dynamic model with two parameters is proposed for the exposed section of vertical finishing prestressed reinforced bars, and the relationship between the normal contact stiffness and the anchoring force is established. The test results of indoor model tests and field tests show that there is a stable linear relationship between the normal contact stiffness and the anchoring force. In additional, the standard method to obtain the relationship curve and the site operation to test the anchoring force on site are provided, which means the problem of tension failure of vertical finishing prestressed reinforced bars can be solved completely.
