Measurement specimen and measurement method for interface characteristic of embedded rib reinforced concrete beam
A technology of concrete beam and interface characteristics, which is applied in the direction of testing material strength by applying a stable bending force and preparation of test samples, and can solve problems such as not considering the influence of dense strain gauge interface characteristics
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[0052] Example 1
[0053] See attached figure 1 , 2 , The present invention is a sample for measuring the interface characteristics of a concrete beam reinforced with embedded reinforcements. The sample includes a combined reinforcement 11, and a through groove 13 is provided along the axis direction at the center of the cross section of the combined reinforcement 11; On the inner wall of the through groove 13, strain gauges 12 are uniformly distributed along the axial direction of the through groove;
[0054] The combined reinforcing ribs are carbon fiber reinforced plastic ribs, the reinforcing ribs are produced by Nanjing Haituo Composite Materials Co., Ltd., and the product name is Lica-200;
[0055] The cross section of the through groove 13 is square.
Example Embodiment
[0056] Example 2
[0057] The difference between the second embodiment and the first embodiment is that a row of strain gauges 12 is attached to a set of opposite inner surfaces of the square through groove 13, and the positions of the same row of strain gauges 12 are on the same straight line along the axial direction of the through groove.
[0058] The preparation method of a specimen for measuring the interface characteristics of reinforced concrete beams with embedded reinforcement is briefly described below: two CFRP bars are processed on a planer to obtain two CFRP bars with a semicircular cross section; on the cross section of the semicircular bar , Slotting along the CFRP ribs; Paste strain gauges on one side of the slot or take the axis of the slot as the axis of symmetry, and paste two rows of strain gauges evenly on the inner wall of the slot, and the positions of the same row of strain gauges are on the same straight line; then , Re-bond two semicircular CFRP ribs into ...
Example Embodiment
[0059] Example 3
[0060] A method for measuring interface characteristics of reinforced concrete beams with embedded reinforcements, including the following steps:
[0061] (1) Design and manufacture of test beams.
[0062] The specification of the concrete beam is 150mm×300mm×2600mm, and the longitudinal reinforcement at the bottom of the beam is 2 14. The erecting rib is 2φ8(A s ′=101mm 2 ), the thickness of the net protective layer of the longitudinal bars c=30mm, a s =30+8+7=45mm, the net protective layer thickness of the vertical bars c′=25mm, a s ′=25+8+4=37mm, then the effective height of the concrete beam is h 0 =255mm, choose φ8@150 stirrups at the 1 / 3 length of the beam span, choose φ8@100 stirrups at both ends of the beam near the 1 / 3 of the support for shear resistance, the concrete strength grade is C30, and a total of 12 concrete beams are poured root.
[0063] (2) Contrast group concrete beam test.
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