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Method for directly measuring bonding performance of PEC type steel reinforced concrete bonding surface

A technology of bonding performance and concrete, which is applied in the direction of measuring device, electromagnetic measuring device, electric/magnetic solid deformation measurement, etc., can solve the problems of accuracy influence, error, etc., to reduce the test error, reduce the test error, and simplify the operation. Effect

Pending Publication Date: 2019-09-24
INNER MONGOLIA UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

This method is correct in theory, but the accuracy is affected by the empirical formula, and it is still difficult to accurately reflect the size of the concrete strain on the contact surface, and there is a certain error

Method used

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  • Method for directly measuring bonding performance of PEC type steel reinforced concrete bonding surface
  • Method for directly measuring bonding performance of PEC type steel reinforced concrete bonding surface
  • Method for directly measuring bonding performance of PEC type steel reinforced concrete bonding surface

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Embodiment

[0044] This embodiment mainly includes the following steps:

[0045] 1. Arrangement of steel strain gauges

[0046] see Figure 2~3 1. Paste steel strain gauges 4 at corresponding steel strain measurement points outside the flange 110 of the H-shaped steel 1 . Since the two sides of the web 120 are in contact with the concrete, the steel strain gauges cannot be pasted directly on the surface of the web 120, so grooves are made on the surface of the web 120, the steel strain gauges 4 are pasted in the groove 121, and filled with epoxy resin 5 . Considering that the contact between the epoxy resin and the concrete surface will affect the bonding performance between the web and the concrete as a whole, a new type of groove 121 is designed, that is, an inverted "convex" groove 121.

[0047] see image 3 , the groove 121 is divided into two layers. The slotting method is as follows: First, a slot with a width of 4 mm and a depth of 1.0 mm is opened along the longitudinal axis ...

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Abstract

The invention discloses a method for directly measuring the bonding performance of a PEC type steel reinforced concrete bonding surface. The PEC type steel reinforced concrete is formed by arranging H-shaped steel between flanges and pouring concrete at the two sides of a web. The method comprises: step one, pasting a strain gauge pair including a metal strain gauge for measuring the strain of the H-shaped steel and a non-metal strain gauge for measuring the strain of a concrete structure at each measuring point of the H-shaped steel; step two, pouring concrete between the flanges of the H-shaped steel at the two sides the web to obtain a structural steel-reinforced concrete test piece; and step three, loading the structural steel-reinforced concrete test piece, colleting strain values of all metal strain gauges and corresponding non-metal strain gauges, and analyzing the bonding performance of the bonding surface of the PEC type steel reinforced concrete based on the collected strain values. According to the invention, the strain of the concrete on the contact surface between the H-shaped steel and the concrete can be measured directly and accurately, so that the bonding performance of the bonding surface of the PEC type steel reinforced concrete is obtained.

Description

technical field [0001] The invention belongs to the technical field of bond performance measurement of steel concrete, and in particular relates to a method for directly measuring the bond performance of a PEC steel concrete bond surface. Background technique [0002] The PEC column (partially encased concrete composite columns, abbreviated as PEC column) steel-concrete composite structure is formed by pouring concrete between the flanges and on both sides of the web with H-shaped steel. The web of the H-shaped steel is completely wrapped in concrete, and the flange is exposed on the Concrete exterior, so it is also called "partially wrapped concrete structure", see figure 1 . This new type of component can be used not only for the reinforcement and reconstruction of old buildings, but also for the multi-story structure of new buildings. [0003] In reinforced concrete structures, the bonding performance between steel bars and concrete is the basis for the cooperative work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N3/08G01B7/16
CPCG01N19/04G01N3/08G01B7/18G01N2203/0016G01N2203/0003G01N2203/0298G01N2203/0676G01N2203/0682G01N2203/0075
Inventor 王晨霞曹芙波卢志明
Owner INNER MONGOLIA UNIV OF SCI & TECH
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