Backward Analysis of the Existing Prestress of Structure

• Main Authors: TZU-HAN YEN, 顏子涵
• Other Authors: Chung Yue Wang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/93aq65

碩士 === 國立中央大學 === 土木工程學系 === 106 === This research develops the inverse calculation method of existing prestress in a PC beam. Simulate the prestressed beam vibration by compatibility of deformation between steel tendon and concrete beam. and the prestressed force is calculated by the initial prestressed state of the beam. The analysis model uses the Euler-Bernoulli beam to simulate the prestressed beam in-to the pre-loading phase and the external loading phase. Firstly, the pre-loading phase is used to investigate the camber deformation of the tendon by the steel in bonded, and the external loading stage is used to discuss the steel in camber. The external force applies on the beam, and the deformation of the concrete beam affects the curvature of the steel tendon, and the tendon state will be change, which indirectly causes the pre-stress state of the beam to be different and affects the deformation. At the same time, the dynamic response of the external loading stage is also discussed. The initial internal force state of the beam is placed into the frequency equation to establish the relationship between frequency and prestressed force. If the above method does not consider the camber state, the equivalent stiffness method is used to stiffen the beam to achieve the purpose of pre-force backward calculation.