| Repairing and strengthening concrete structures with Carbon Fiber Reinforced Polymer (CFRP) is now a new technique popularized greatly in the domestic field of structure rehabilitation. Because of its high performance such as light weight, high strength, simple procedures of construction and its good anti-decay property, CFRP is being used extensively in international and domestic civil engineering.In this paper , experimental research on the flexural behavior of nine RC two-way slabs reinforced with CFRPS and one RC slab was carried out. The size of each slab was 1800mm×1500mm×70mm.Load was distributed to each slab through 4 loading points. In the test, many factors were considered, such as method of strengthening, the quantity of CFRPS, layer number of CFRPS, anchorage way, weather or not being secondarily loading .The theory of failure and type of failure of the strengthened slabs were analyzed and a simple and practical calculating formula was proposed.The experimental results indicate that after reinforced, the ultimate bearing capacity of slabs and stiffness were improved, and the width of cracks become smaller. According to the type of failure of reinforced slabs, three yield line patterns were presented and simple and practical calculating methods were proposed. The calculation results agree with the experimental results and when the modified coefficient was considered ,as compared with experimental value, the calculation results is on the conservative side. In addition, debonding failure is a very important factor in the strengthening test, we must find out a reasonable way to eliminate the effect of debonding failure on reinforced members in future.
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