Equipment and method for eccentric pull-out test of frp bars considering the influence of bending-shear stress

A technology of pull-out test and stress, which is applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of complicated test piece production, complicated loading device, not intuitive and accurate enough, and achieve simple and efficient test device and simple test device , the effect of accurate slip value

CN106525717BActive Publication Date: 2019-01-29SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-29

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Abstract

The invention discloses an FRP (fiber reinforced plastic) rebar eccentric pull-out test device considering a bending shear stress effect. The device comprises an outer frame, wherein a concrete block is arranged in the outer frame; an FRP rebar is penetrated through the concrete block from top to bottom, a free end displacement meter is connected to the upper end of the FRP rebar; a universal test machine platform is connected below a bottom plate of the outer frame through multiple screw rods; the universal test machine platform is provided with a pull-out force test load sensor; the lower end of the FRP rebar is clamped by a universal test machine clamping head after penetrating through the pull-out force test load sensor; the universal test machine clamping head is connected with a loading end displacement meter; a bracket is arranged at one side of the outer frame; a lifting jack is arranged on the bracket; a piston rod of the lifting jack is connected with a load sensor for testing a horizontal force through a connecting screw rod; the load sensor for testing a horizontal force is connected with a loading rod; the loading rod is connected with a side surface of the concrete block; and the other side of the concrete block is connected with the outer frame. According to the invention, the stress of the FRP rebar in the test process is identical to the stress of the FRP rebar in practical engineering.
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Description

technical field

[0001] The invention relates to the technical field of pull-out test for building reinforcement, in particular to an FRP tendon eccentric pull-out test device and method considering the influence of bending and shear stress. Background technique

[0002] In a highly corrosive environment, the use of fiber reinforced composite bars (FRP bars) to replace traditional corrosion-prone steel bars will greatly improve the durability of concrete structures and prolong the service life of concrete structures, thereby minimizing the cost of the entire life cycle of the structure. change. The effective bonding between FRP bars and concrete is the key factor to ensure that they work with concrete and work together. The surface morphology of FRP bars is different from ordinary steel bars, and the bonding performance between them and concrete requires a lot of theoretical and experimental research.

[0003] At present, the most commonly used test method for the bond perf...

Examples

Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] like figure 1 Shown, a kind of FRP tendon eccentric pull-out test device of the present invention that considers the influence of bending-shear stress includes steel reaction force frame system, bending-shear stress application system, and pull-out force and bar slip measurement system; figure 2 As shown, the steel reaction frame system includes a rectangular steel frame 1 , a bottom plate 2 , a screw 3 , and a steel bracket 4 . like Figure 7 As shown, the flexural-shear stress application system is composed of a steel T-shaped loading rod 5, a load cell 6 for testing horizontal force, a connecting screw 7 and a jack 8 connected in sequence and placed on a bracket 4 for applying to a concrete block 17. Horizontal force, so that the bending and shearing stress is generated in the concrete block 17, which is used to simulate the actual situation. like figure...