Calculation method of strengthened RC beam oblique section with FRP based on the effective pasting length

Present study is aimed at the insufficient consideration of some key factors of recommended formula of the various countries standard about strengthened RC beam oblique section with FRP at present.Based on the effective bond length of FRP and the slipping characteristic of bond layer,the paper introduced FRP stress distribution coefficient,initial stress revise coefficient and FRP stress reduction coefficient,then provided a kind of new formula of strengthen RC beam oblique section finally.Based on the collection of 60 RC beam test data where oblique section is strengthened with FRP.It also predicted the result of the recommendation formula of this text and presented guide for the design and construction of externally bonded FRP systems for strengthening concrete structures(ACI440)etc.The result indicates,the predicted results of this text are accurate and effective to other formula, and there are certain reference meanings to the further research in this field.