Techno Press

Steel and Composite Structures   Volume 19, Number 3, September 2015, pages 735-757
New technique for strengthening reinforced concrete beams with composite bonding steel plates
Su-hang Yang, Shuang-yin Cao and Rui-nan Gu

Abstract     [Full Text]
    Composite bonding steel plate (CBSP) is a newly developed type of structure strengthened technique applicable to the existing RC beam. This composite structure is applicable to strengthening the existing beam bearing high load. The strengthened beam consists of two layers of epoxy bonding prestressed steel plates and the RC beam sandwiched in between. The bonding enclosed and prestressed U-shaped steel jackets are applied at the beam sides. This technique is adopted in case of structures with high longitudinal reinforcing bar ratio and impracticable unloading. The prestress can be generated on the strengthening steel plates and jackets by using the CBSP technique before loading. The test results of full-scale CBSP strengthened beams show that the strength and stiffness are enhanced without reduction of their ductility. It is demonstrated that the strain hysteresis effect can be effectively overcome after prestressing on the steel plates by using such technique. The applied plates and jackets can jointly behave together with the existing beam under the action of epoxy bonding and the mechanical anchorage of the steel jackets. The simplified formulas are proposed to calculate the prestress and the ultimate capacities of strengthened beams. The accuracy of formulas was verified with the experimental results.
Key Words
    composite bonding steel plate; reinforced concrete beam; prestressed steel plates; u-shaped steel jackets; epoxy bonding; ultimate capacity
(1) Su-hang Yang, Shuang-yin Cao:
School of Civil Engineering, Southeast University, Nanjing, Jiangsu, 210096, China;
(2) Rui-nan Gu:
Jiangsu Research Institute of Building Science CO., LTD., Nanjing, 210008, China.

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