Autogenous deformation analysis of ultra high pylons concrete structure under multi-field interaction

In practice, due to the intrinsic complexity, it is necessary to assess the service performance of structural concrete which considers the multi-field interaction other than the simple non-coupled impact. In this paper, the physical mechanism of multi-field interaction is addressed in terms of the coupled chemical-thermal-humidity model, which further accounts for the calculation of macroscopic autogenous deformation. The model is applied on the pylons structure of Hutong Bridge Crossing Yangtz River. Results indicate that the maximum strain can reach 350 μ ε induced by the thermal stress. As the distance from the center of pylon structure increases, the thermal expansion decreases. Moreover, autogenous shrinkage is detected with the continued hydration, since relative humidity gradually decreases with the water consumption.