Experimental Research On Flexural Behavior Of Aluminium Alloy-CFRP Composite Beams

The aluminum alloy has got the extensive application in actual engineering already. However, the disadvantages of excessive deflection and web crippling would be two of the factors that affecting its application realm. Meanwhile, the application of CFRP in strengthening RC structures has been widely developed, and its theory is sophisticated relatively. In this paper,CFRP sheets are used to strengthen the thin-wall aluminum alloy beams. Main research and conclusions are summarized as follows:1. The bending experiments of two series of test samples have been conducted. It indicates that the ultimate loads of the thin-wall aluminum alloy beams strengthened with CFRP sheets can be increased evidently, and the midspan deflections of them can also be reduced. Therefore, such strengthening method is feasible.2. Based on the analysis of experiment data, a conclusion is drawn that the aluminum alloy-CFRP composite beams approximately obey the assumption of plane crosssetion. And the whole process is devided into three stages: the stages of obeying the assumption completely, approximately and the stage of disobeying the as sumption, respectively.3. The lateral buckling of aluminum alloy-CFRP composite beams accurs suddenly to a certain extent. In this paper, a suggestion of inflection-point and zero-point is proposed, which can forecast the lateral buckling.4. Taking advantage of FEA software ANSYS?, the aluminum alloy-CFRP composite beams are analysed. The ultimate loads, state of failure, stress distribution of CFRP, load-deflection curve, which gained from finite analysis, make a close agreement with experiment data on both numerical value and variation regularity of curve.