During punching shear failure process, the stress states near slab-column node are complex and nonlinear characters of reinforced concrete make the problems more complicated. In this paper, by considering nonlinear characters of reinforced concrete, punching carrying capacities of slab-column nodes are to analyze by using nonlinear finite element methods, and then the reasonable reinforcement schemes at slab-column nodes have been determined. The slab-column nodes are strengthened by using CFRP sheets. Compare punching bearing capacities of nodes in reinforcement structure with that in unreinforcement structure, the results show that this strengthened method can effectively improve punching resistance bearing capacities of slab-column nodes.

Study on Punching Resistance of Slab-Column Nodes Strengthened with CFRP Sheets by Nonlinear Finite Element Methods

In order to study the strong column and weak beam effect of the column ends reinforced with carbon fiber reinforced polymer(CFRP),a numerical quasi-static model was established with ANSYS software for a three-storey reinforced concrete frame structure.The results for traditional joints specified in the design code and for the joints retrofitted with CFRP were compared.It was found that the stress in the reinforce bars for slab close to the beam increases significantly with the applied top displacement of the structure in horizontal direction,but increases slightly for slab far from the beam.For the joints retrofitted with CFRP,the yielding of column reinforce bars will be delayed,while the number of cracks on beams increases,which tend to exhibit a failure type closer to the beam-pivot or ductile mode.

Research on the efficiency of strong column and weak beam design for reinforced concrete frame retrofitted with hybridized CFRP

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Research on the efficiency of strong column and weak beam design for reinforced concrete frame retrofitted with hybridized CFRP