FRP cloth material strengthening method for concrete beam-column joint
A beam-column joint and concrete technology, which is applied in building maintenance, construction, building construction, etc., can solve the problems of hard to handle reinforcement, self-heavy reinforcement, poor corrosion resistance, etc., and achieve the effect of easy popularization and use.
Inactive Publication Date: 2017-07-28
GUANGXI UNIV
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Problems solved by technology
[0005] In view of the above-mentioned deficiencies, the present invention provides a reinforcement method of FRP fabric for concrete beam-column joints, which can not only solve the problems of poor corrosion resistance, self-heavy reinforcement and difficult construction in the traditional reinforcement and repair method of damaged concrete beam-column joints Large, especially the reinforcement at the nodes is not easy to handle and many other shortcomings, it can also facilitate construction, reduce pollution, repair the overall performance of damaged nodes, and make it meet the use function
Method used
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[0033] A method for reinforcing concrete beam-column joints with FRP fabrics, such as figure 1 shown, consists of the following steps:
[0034] 1) Remove the failed concrete on the damaged concrete beam-column node 1 that needs to be reinforced;
[0035] 2) Fill the cleared place in step 1) with a filler made by mixing binder and polymer modified cement mortar, and the filling thickness is 20mm;
[0036] 3) Embed epoxy resin in the remaining cracks with a crack width greater than 0.3mm;
[0037] 4) After the filler in step 2) is hardened, grind the surface of the concrete beam-column joint;
[0038] 5) Open holes on the surface of the polished concrete beam-column joint according to the opening distribution spacing range of 100mm, the hole depth is 50mm, and the aperture is 10mm, and remove impurities on the surface of the concrete beam-column joint;
[0039] 6) Paste the L-shaped FRP cloth material 3 on the upper and lower corners of the concrete beam-column joints. The le...
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Abstract
The invention belongs to the field of concrete structure strengthening, in particular to a FRP cloth material strengthening method for a concrete beam-column joint. The method comprises the following steps that 1) disabled concrete on a damaged concrete beam-column joint is cleared; 2) a cleared position is filled with filler; 3) epoxy resin is embedded into rest cracks which are larger than 0.3 mm in slit width; 4) the surface of the concrete beam-column joint is polished after the filler is solidified; 5) holes are formed in the polished surface of the concrete beam-column joint according to designed intervals; and FRP cloth materials are pasted on upper and lower corners, column, beams and beam-column interfaces of the concrete beam-column joint correspondingly, then anchor bolts of fiber anchors are embedded into the holes, air voids are filled with the epoxy resin to be fixed, bulging-out fibers of the fiber anchors are bent and pasted to the surfaces of the FRP cloth materials through epoxy resin adhesive. According to the FRP cloth material strengthening method for the concrete beam-column joint, construction is simple, cost is low, strengthening effect is good; and the method can adapt to each type of beam-column joint, and can be well promoted to be used in the field of concrete beam-column joint strengthening.
Description
technical field [0001] The invention belongs to the field of concrete structure reinforcement, in particular to a reinforcement method of FRP cloth material for concrete beam-column joints. Background technique [0002] Premature failure of reinforced concrete beam-to-column connections can lead to large lateral deformations and subsequent collapse. Inadequate detailing of beam-column joints can lead to punching, shear and anchorage failures, which can lead to soft layer effects, especially if the failure occurs at the column. As key components in structural design, beam-column connections play a key role in bearing seismic loads. However, some earlier buildings were constructed without seismic design or structural detailing. These include inadequate stirrup reinforcement, out-of-length beam bottom reinforcement, or other non-ductile detailing. These structures therefore have to rely on their inherent ductility to respond to seismic excitations, which makes the structures...
Claims
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IPC IPC(8): E04G23/02
CPCE04G23/02E04G23/0218
Inventor 钱凯邓小芳麦艺馨余洋罗达滕晓丹贺盛
Owner GUANGXI UNIV