Reasonable Reinforcement Method Of Reinforced Concrete Frame Joint Core Research

Frame node is the most complex and frame structure of force transmission parts of the key, but it is also the framework of the weakest parts, if frame node failure, in the earthquake will lead to overall instability of frame structure, then a building structure overall collapse. In our country at present there are a large number of frame structure of the need to reinforce, so for the frame node reasonable reinforcement method research is very meaningful. Now for strengthening research rely mostly on test framework node, with the continuous development of the finite element method, using finite element software to simulate the experiment research is a kind of effective method, so this article USES the finite element software Midas- fea finite element analysis of the frame node of the reinforcement. Specific work is as follows:By means of finite element analysis software, the four kinds of finite element model was established, one is compare the node model, an enlarged cross section method is used to reinforce the node model, 2 were respectively by enlarged cross section method and paste layer, two layers of carbon fiber cloth reinforcing node model, at the same time, considering the influence of axial compression ratio on node reinforcement. Because of the constraints,this article first to the unreinforced node, enlarged cross section method and enlarged cross section method and pasting carbon fiber reinforcement node calculated load displacement curve of the ultimate load, ultimate displacement, stiffness, ductility and crack propagation in the node core are analyzed, then the unreinforced node and adopts the different reinforcement method, in not under the action of axial compression ratio of reinforcement effect is analyzed.By analyzing the results get the following conclusion:(1) the enlarged cross section method is adopted and pasting carbon fiber reinforced node is only enlarged cross section method for the ultimate load of a larger increase.Obviously improving the bearing capacity of the node that joint reinforcement method is a kind of effective reinforcement methods.(2) increasing the surface area of the joint core enlarged cross section method, reduction of trabecular effective length, thus improve the shear capacity of joint core, but also effectively suppresses the development of the core concrete cracks.(3) the axial compression ratio on shear properties of the node is influential, when the axial compression ratio, the seismic performance of 0.5 or less time point and axial compression ratio increases. When the axial compression ratio is greater than 0.5 and vibration resistance decreases with the increase of axial compression ratio.(4) paste CFRP layer also is able to enhance the bearing capacity of the node, but when the axial compression ratio of 0.5 or less than paste paste layer of a layer of reinforcement effect is good. When the axial compression ratio more than 0.5 paste layer has no effect on reinforcement effect...