A method for detecting the existing prestress of concrete bridge structure

Abstract

The invention relates to an existing-prestress detection method for a concrete bridge structure. The existing-prestress detection method includes the following steps of 1 selecting a testing section, 2 determining a slotting parameter, 3 determining the detection time, 4 preparing and checking a sensor, 5 arranging the sensor, wherein a measuring piece and a compensation piece are arranged, 6 conducting a slotting test and data acquisition, wherein the step comprises the processes of slotting position positioning and interval, the effective slotting length determination, cutting machine control parameter adjusting and concrete cutting, 7 acquiring data and stabilizing requirements, 8 analyzing the data, wherein when the cutting depth is 34 mm, the existing-prestress of the testing section is calculated according to the formula (please see the formula in the specification) and 9 repairing the tested region portion. The existing-prestress detection method for the concrete bridge structure has the advantages of being standard in operation procedure, high in tested data reality and high in operability of the test process.

Description

technical field [0001] The invention belongs to the bridge detection technical field of bridge engineering, in particular to a method for detecting the existing prestress of a concrete bridge structure. Background technique [0002] The size of existing prestress is the main index to evaluate the bearing capacity of prestressed components. At present, there are obvious deficiencies in the existing prestress detection of prestressed concrete bridges. Relevant literature points out that there is no method that can accurately detect the existing prestress value of prestressed structural members. Existing existing prestress testing techniques include: SSRHT method, shape memory alloy (SMA) technology, acoustic emission technology, electromagnetic effect detection method, gray theory, probability analysis model, research method of structural force status based on sensitivity analysis, dynamic Test method, stress relief method, etc. Some of these methods have a high degree of da...

AI Technical Summary

Problems solved by technology

At the same time, various scholars have conducted research on the release method, and the experimental conclusions they have drawn are not consistent, such as the depth of the stress release being zero, etc., and the selection of sensors is also inconsistent. They agree with the factors that affect the test, such as deflection, Temperature, water, etc., but none of them came up with a good solution

In addition, due to the differences in the selection of cutting tools, the strain data is greatly affected by the disturbance of the cutting tools on the concrete

Restricted by these uncertain factors, although the stress relief method is currently a hot topic in research, there is still a certain distance from the practical application of engineering.

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