Measuring method of actual stress of reinforcement in existing reinforced concrete shear walls and columns

Abstract

A method for measuring the actual stress of steel bars in existing reinforced concrete shear walls and columns, to obtain the elastic modulus E and yield strength f of steel bars in non-important parts y and ultimate tensile strength f u ; Chisel off the concrete to expose a section of the steel bar to be tested; grind off the oxide layer on the surface until it is smooth and clean it, and attach four strain gauges in the circumferential direction of the same section; before being cut off, obtain the initial strain ε 30 , ε 40 , ε 50 and ε 60 , and the initial strain value obtained from the mean value after being cut off, respectively to obtain the release strain ε 31 , ε 41 , ε 51 , ε 61 , and the released strain value is obtained from the average value, the strain difference Δε of the steel bar under test before and after being cut; the actual stress value σ is obtained by using the difference between the sum and the value; comparative analysis σ, f y and f u The size relationship of the measured steel bar and determine the stress state at the steel bar under test; reconnect the steel bar under test. The method can effectively detect the actual stress state of the steel bars in the existing reinforced concrete shear walls and columns.

Description

technical field [0001] The invention belongs to the technical field of safety detection of the stressed state of reinforced concrete shear walls and columns, in particular to a method for measuring the actual stress of steel bars in existing reinforced concrete shear walls and columns. Background technique [0002] With the progress and development of society, high-rise buildings have gradually become the main structural form. Shear wall and shear column structures have the advantages of good integrity, high lateral rigidity, and mature technology, and are widely used in high-rise buildings. Nowadays, earthquakes occur frequently in some areas, and shear wall and shear column structures are used as earthquake-resistant structures. The first line of defense plays a vital role in the overall structure of the building. At present, with the continuous improvement of people's living standards, there are higher requirements for the functions of building structures. It is necessar...

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Problems solved by technology

[0003] For the completed buildings, there are many uncertain factors in the use of the shear wall and shear column structure, which makes the actual stress and the original design value have a certain gap

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