| The slab column structure is one of the commonly used structural styles in the construction structure,which has the simple structure system, the power transmission way is clear, the floor clearance is high, the handsome appearance is natural, the construction convenience and quickly for a series of merits. Slab column attachment point will transfer shear and unbalanced moment in slab column connection, so the punching resistance capacity of the joint can be reduced and make the joint becoming a weaker link in aseismic engineering.According to five kind of heterogeneous slabs(square shape, rectangle1, rectangle2, L shape, cruciform) which has already occur punching destruction. Chisels the concretes in the punching destruction cone scope, in order to achieve the punching resistance capacity which before the reinforcement, the new design is carried on. Two methods are adopted to carries on the new design, one is to adopt shear reinforcement, another is use carbon fiber. Through carries on the comparison before the reinforcement test result, explained that uses the above punching resistance measures to strengthen the node punching resistance performance are validity.Through experimental study analysis, the slab supporting capacity enhanced 3%~5% and the vertical distortion ability reduced compared with the original slab. CFRP has not restrained nearly to the concretes and the display function is not obvious. The result which obtains by the concrete structure design standard GB50010 2002 in formula computation has certain disparity with test result. Revise the coefficient of punching resistance capacity formula 0.8 to 0.12. The steel bar function which has only displayed 2%~3% is not obvious, so the concrete plays the leading role. The shear reinforcements are too few, and the ratio of reinforcement is only 0.032%, then enhances ratio of reinforcement is suggested. Punching destruction is not in the new old concrete adjoining place, and the majority is in the new concrete place. |
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