Experimental Study And Finite Element Analysis On Reinforced Concrete Columns Strengthened With Transverse CFRP

Concrete structures strengthening with CFRP is a new type technology of structural reinforcement and reconstruction. Application of this technology to strengthen RC structure is able to restore and improve the carrying capacity and capacity of the existing or damaged structures, to extend the structure life and to suffice the follow-up use. Not only will this eliminates the security risk of the structure, to consolidate the using function of the structure, but also save a lot of funds. Therefore, the huge social and economic benefits are gained. In this paper, the reinforced concrete columns strengthened with thedifferent layers transverse CFRP are mainly researched by shaking table test. The main achievements of this study could be summarized as follows:1. First and foremost, this paper introduces some basic properties and characteristics of FRP. Besides, it reviews the development course, application and research status of FRP at home and abroad, and looks forward to the future and trend of FRP. Last but not least, the significance of subject and the research of this article are shown.2. A total of four single layer flat-slab floor constructions have produced as test models. One of which has been made to reinforce is comparative model, and the others are respectively wrapped with one-layer, two-layer and three-layer transverse CFRP. Inputting single direction seismic EI-Centro(N-S) waves observe the damage of various models. The displacement and acceleration of shaking table and the top of model are measured by displacement gauge and accelerometer. It is showed that the transverse CFRP can be well improving the ductility of column by test results analyzing.3. The seismic performance of the concrete column reinforced with CFRP is studied by modal analysis for the test model. By analyzing changes of natural frequencies and damping ratios of four models after the shaking table test, it is found that although the reinforced concrete columns strengthened with transverse CFRP cannot effectively enhance the strength of the concrete column, it can prevent crack appearance and development so as to increase the shear capacity of the concrete column. The test results show that the more CFRP is used, the better reinforcement effect is.4. The test process is numerically simulated using the finite event software ANSYS10.0. In this paper, the whole process which the test models reinforced with one-layer, two-layer and three-layer transverse CFRP respectively are subjected to the seismic wave with peak acceleration of 0.33g is calculated numerically. The finite element model is constructed and the theoretic modal analysis is performed to generate natural frequencies. The vibration process of test models is simulated to obtain relative displacement time history curve with the method of time history response analysis. The numerical calculations results are compared with test ones.