Prestress Loss Test and Analysis of Long Span Continuous Rigid Frame Bridge
Abstract
Prestress loss has a great influence on working performance of bridge structure, which is concerned highly by the engineers. In this paper, based on a large span continuous rigid frame bridge, the prestress change during the construction and prestress loss after closure is tested and analyzed by laying the magnetic flux sensor. The test and calculation results show that during segmental cantilever construction process, the measured values is very close to the theoretical value, indicating that the magnetic sensor is reliable. After the whole bridge is closed, the prestress value of T10, D6 and D2’ decreases with time, and the change trend is basically the same for 150 consecutive days for which have no any construction work on the bridge deck. This result has a high reference value for the design and construction of long-span prestressed continuous beam (rigid) bridge.
Keywords
Continuous beam (rigid frame) bridge, Prestress loss, Test and analysis, Magnetic sensor
DOI
10.12783/dtmse/icmsea/mce2017/10841
10.12783/dtmse/icmsea/mce2017/10841
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