Experimental on positive bending behaviour of composite bridge decks with steel-fiber-reinforced concrete and longitudinal bulb-flat ribs
A composite bridge deck composed of 80 mm steel-fiber-reinforced concrete(SFRC)and longitudinal bulb-flat ribs was investigated by model tests.Two full-scale specimens were designed and fabricated.Positive bending tests were carried out and the variations of stiffness and structural strain during the loading process were obtained.The elastoplastic cross-sectional analysis method,linear elastic analysis method and rigid-plastic analysis method were used to calculate the positive bending resistance and the results were compared with the experimental results.It was found that the composite bridge deck has good ductility when it was subjected to positive bending.At the ultimate limit state,the positive bending resistance is governed by the stress bearing of the bulb-flat ribs and the SFRC has sufficient compressive strength.Increasing the compressive strength of SFRC has little influence on the positive bending resistance.The elastoplastic cross-sectional analysis is more accurate and applicable for the calculation of the positive bending resistance of the composite bridge deck.
万方数据
维普
