AUTOMATIC MONITORING OF CONTINUOUS RIGID FRAME BRIDGES BY A MAGNETO-ELASTIC EFFECT METHOD

Xiaogang Li, Jianting Zhou, Liyong Zhang, Jun Yang, and Yangjian Xiao

Keywords

Magnetoelastic effect method, continuous rigid frame bridge, prestress, monitoring, automatic

Abstract

Because lack of long-term effective technical means to test prestressing loss for continuous rigid frame bridges, an automation monitoring system based on the principle of megneto-elastic effect method had been built for testing prestressing loss and applied in the Niu Lan river bridge to fulfil long-term, online and automatic monitoring. Application shows that prestressed loss measured values consistent with the theoretical analysis values, and with good agreement. The tension error is smaller. It can be better controlled and meet the specification requirements, which shows that the magnetic bomb effect method is stable and reliable and it can effectively guide the construction. It is verified that the magneto-elastic detection method for continuous rigid frame bridge is the feasibility and rationality of automatic monitoring system.

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