The Experimental Study On Compression Performance Of Concrete Columns Strengthened With Prestressed Steel Strip

Column is one of the main load-bearing elements in reinforced concretestructures. If own inadequate bearing capacity, ranging from lead to the tilt of thebuilding, while in a whole building collapsed, the consequences are serious. Andconcrete columns in the true sense of the uniform compression very little probabilities,even if the theoretical axial compression column construction error may cause someeccentric, eccentric compression is the most common concrete column form of force. Inthis paper is that a new type of prestressing steel strip reinforcement technology, itsfundamental theory is weak, therefore it is necessary to start with a basic steel stripreinforced concrete columns under axial compression and bias performance testresearch, draw the prestressing steel strip confined concrete columnsaxial strength ofthe model, to lay the foundation for the establishment and application of the subsequenttheoretical formula.This article completed eight steel strip reinforced concrete columns under axialcompression test, examine steel strip spacing and strip layers of steel strip reinforcedconcrete bearing capacity and ductility impact. The test results show that: theprestressing steel strip can significantly increase the carrying capacity and ductility ofthe concrete square columns. Spacing decreases with steel strip, or the number of layersincreases, the bearing capacity increases linearly with the trend.But the increase in thenumber of layers, the bearing capacity enhancing effect is not doubled, while theductility has been greatly improved, more and more gentle in descent stage.Analyze thestrip constraint mechanism, establish The prestressed steel strips constraint axial compressive strength of concrete model,and fit drawn prestressing steel stripreinforcement the square concrete short columns pressure compressive strength formula.Using the finite element ANSYS to carried out the simulation of the reinforcement testpiece, simulation of results with the experimental data anastomosis is better, enrichedthe prestressed, steel tape axial compression, reinforcement the research results.This article also completed9prestressed steel strip composite reinforcement of RCcolumns eccentric compression test. In the way of this reinforcement, the steel plate towithstand vertical load, due to the peripheral strip bondage plate is not easy todisengage. Strip constraint section of the test piece, improved compressive strength, andbetter ductility of the specimen in the falling section. The results showed that: comparedwith the contrast column, although the steel plate is peeled off before the peak load, butbecause of the presence of strip binding effect, the use of prestressed steel and steelcomposite reinforcement will still be effective to improve the bearing capacity ofreinforced concrete eccentric compression column, and the ductility also been greatlyimproved, more portentously destruction；finally deduced that type composite thereinforcement bias columns reinforcement formula.