附录一 英文翻译 原文 AUTOMATIC DEFLECTION AND TEMPERATURE MONITORING OF A BALANCED CANTILEVER CONCRETE BRIDGE by Olivier BURDET, Ph.D. Swiss Federal Institute of Technology, Lausanne, Switzerland Institute of Reinforced and Prestressed Concrete SUMMARY There is a need for reliable monitoring systems to follow the evolution of the behavior of structures over time. Deflections and rotations are values that reflecthe overall structure behavior. This paper presents an innovative approach to the measurement of long-term deformations of bridg use of inclinometers. High precision electronic inclinometers can be used to follow e long-term rotations without disruption of the traffic. In addition to their accuracy, these instruments have proven to be sufficiently stable over time and reliable for field co The Mentue bridges are twin 565 m long box-girder post-tensioned concrete highway bri under construction in Switzerland. The bridges are built by the balanced cantilever method over a deep valley. The piers are 100 m high and the main span is 150 m. A centraliz acquisition system was installed in one bridge during its construction in 1997. Ever the system records the rotation and temperature at a number of measuring points. The simultaneous measurement of rotations and concrete temperature at several locations clear idea of the movements induced by thermal conditions. The system will be used in combination with a hydrostatic leveling setup to follow the long-term behavior of the Preliminary results show that the system performs reliably and that the accuracy of the sensors is excellent. Comparison of the evolution of rotations and temperature indicate that the structure to changes in air temperature rather quickly. ...
