A new measuring method of friction losses of prestressed tendon in post-tensioning

摘要

This article is based on the basic principle of the calculation of friction losses of prestressed tendon in post-tensioning, and it also put forward a new method which can measure effectively coefficient of friction (μ), wobble factor (k) and the friction loss rate of anchorage zone. With the measured actual elongation of prestressed tendon and the known jacking force, the method can get the unknown parameters by solving nonlinear equations. This method does not need to use stress sensor, and the test can be done with the only need of common measuring tools and equipment, and the process is simple. It has important reference value to construction and detection of post-tensioning system.