This report describes the stiffness of the asphalt pavement, considering the temperature effect and stress of orthotropic steel deck. The vehicles loading test is carried out for orthotropic steel deck both in summer and in winter, and we investigate the stiffness of the asphalt pavement by considering the relation between stress and temperature. Moreover, while computing the equivalent stress in every hour from the stress frequency measurement result, the equivalent axle load in every hour was computed using the live-load measurement result by BWIM. This method enabled it to analyze the evaluation of the stiffness of the asphalt pavement which was not able to be performed at elevated temperature by field measurement tests.
