An integrated device suitable for rapid and safe diagnosis of small and medium bridges

Abstract

The invention discloses an integrated device applicable to fast and safety diagnosis of middle and small bridges. The integrated device comprises a mobile inspection vehicle, an impact excitation device, a data acquisition device, a data processing device, and an extensible cantilever system at the lower end of the chassis of the mobile inspection vehicle; the impact excitation device comprises a loading bracket and a loading hammer arranged on the loading bracket; the data processing device comprises a force measuring sensor which is arranged on the lower end surface of the loading hammer and used for measuring the time-displacement data of the force formed by impacting the bridge pavement and an accelerometer sensor which is positioned at the tail end of the cantilever system and used for measuring the acceleration response of the bridge; and the data processing device is used for identifying a displacement flexibility matrix of the bridge according to the force time-displacement data measured by the force measuring sensor and the bridge acceleration response data measured by the accelerator sensor. The integrated device can be used for ensuring that the mobile type impact vibration test of the middle and small bridges to smoothly perform, ensuring that the reliability of the structure performance evaluation result obtained by analyzing the measured impact vibration data, and has relatively high advantages in comparison with the conventional method.

Description

technical field [0001] The invention relates to the fields of dynamic testing and safety evaluation of medium and small bridges in civil engineering and traffic engineering. It can carry out rapid impact and vibration tests on bridges to achieve the purpose of carrying capacity evaluation and safety diagnosis of small and medium-sized bridges. Background technique [0002] There are a huge number of small and medium-sized bridges on my country's national highway network. How to ensure their health and safety and avoid bridge collapse accidents has become an urgent scientific problem. Structural bearing capacity is an important indicator of structural safety. Truck static load test is an on-site test method widely accepted by bridge engineers. It completes the effective evaluation of bridge bearing capacity by statically loading the tested bridge and observing the corresponding bridge deformation and other indicators. The Ministry of Communications of my country's "Methods ...

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Problems solved by technology

But its disadvantage is that the test is expensive, time-consuming and labor-intensive, which leads to a long time for the bridge to be closed and open to traffic during the test, which affects traffic, which is the last thing bridge managers want to see.

[0003] There are a large number of small and medium-sized bridges in our country, most of which are in disrepair and have potential safety hazards, but they are faced with the embarrassment of very limited funds and manpower for maintenance

Therefore, the costly and inefficient truck static load test described above cannot be widely used for safety assessment

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