Study on Interlayer Performance of ECO-SMA Pavement on Orthotropic Steel Deck
This study investigates the factors influencing the interlayer performance of the ECO(modified polyurethane concrete)-SMA(stone mastic asphalt)pavement on the orthotropic steel deck.Based on the Tongzi River Bridge of the Jinsha-Renhuai-Tongzi Expressway,a finite element model of similar bridge deck was established,to calculate the maximum shear stress and normal tensile stress between the layers of the deck pavement considering different pavement thickness and longitudinal slope gradient,at temperatures of 15 ℃ and 60 ℃.Additionally,a fitting study on the simplified calculation method for interlayer stress in ECO-SMA steel pavement is conducted.The results demonstrate that under the same pavement thickness and longitudinal slope gradient,the interlayer stress in the pavement measured at a temperature of 60 ℃ is a little smaller than that measured at a temperature of 15 ℃.When ignoring the longitudinal slope gradient of the deck,the maximum shear stress and normal tensile stress between layers of the pavement show sign of decreasing as the pavement thickness increases.The interlayer stress in the pavement is in direct proportion to the increase of the longitudinal slope gradient of the deck,the calculation error between the simplified interlayer stress calculation formula and the finite element modeling in the context of flat slope is only 3.1％,while the error between the calculated and simulated interlayer stresses is within 10％after longitudinal slope gradient modification,proving that the proposed formula can be used for rough prediction of the interlayer stress in the pavement.
pavement on orthotropic steel deckmodified polyurethane concreteSMAinterlayer performanceinfluential factorsimplified calculation methodfinite element method
万方数据
维普
