Scale model test device and method for monitoring temperature and variable load deformation of continuous rigid frame bridge

Abstract

The invention provides a scale model test device and method for monitoring the temperature and the variable load deformation of a continuous rigid frame bridge. The test device comprises a reduced scale box girder and thin-walled bridge piers for supporting the reduced scale box girder and fixedly connected below the reduced scale box girder; wherein the upper surface of the reduced scale box girder is provided with counterweights; a side of the reduced scale box girder is provided with an opening; a side of the opening side of the reduced scale box girder is provided with a cold and warm airblower disposed toward the opening; the reduced scale box girder has a reaction frame in its span; the end of the reduced scale box girder away from the cold and warm air blower and the lower part ofthe span of the reduced scale box girder are provided with a box girder dial gauge facing the reduced scale box girder and measuring the horizontal deformation of the end portion of the box girder anda box girder dial gauge facing the reduced scale box girder and measuring the vertical deformation of the span of the box girder respectively; the upper-end side portion of the thin-walled bridge pier has a bridge pier dial gauge for measuring the horizontal deformation of the thin-walled bridge pier. The scale model test device and method for monitoring the temperature and the variable load deformation of the continuous rigid frame bridge and can directly monitor the absolute deformation value of the continuous rigid frame bridge, and solve the problem that other monitoring methods cannot directly measure the deformation of the box girder.

Description

technical field [0001] The invention relates to a scale model test device and method for monitoring the temperature and live load deformation of a continuous rigid frame bridge. Background technique [0002] The continuous rigid frame bridge is a continuous girder bridge in which the pier and the main girder are consolidated. Because of its simple and beautiful bridge shape, good integrity, comfortable driving, and relatively mature design theory and construction technology, it is deeply loved by bridge designers. Within the economic span range, it has become one of the most competitive bridge types on highway bridges. However, most of the continuous rigid frame bridges that have been in operation for a period of time have many diseases. Among them, the cracking of the bottom of the box girder caused by the excessive deflection of the mid-span has become the most harmful disease of this bridge type. After the cracking of the bottom of the box girder, the box The stiffness o...

AI Technical Summary

Problems solved by technology

[0004] The present invention improves the above-mentioned problems, that is, the technical problem to be solved by the present invention is that currently the health monitoring of continuous rigid frame bridges generally uses sensors embedded in the bridge structure to carry out long-term real-time online monitoring of the deformation of the bridge structure in operation, Analyze the health status of the bridge based on the monitoring data and evaluate the safety of the bridge. However, the sensor can only collect the relative strain value of the box girder, and then calculate the relative deformation value of the box girder through strain calculation, and cannot directly measure the temperature and vehicle temperature of the box girder. Moreover, due to the complexity of bridge operation and disease problems, the sensors embedded in the box girder are often damaged or invalid after long-term use, and the deformation of the bridge mid-span cannot be accurately monitored.

Images