大掺量粉煤灰箱梁C55高强混凝土导温系数研究OA

To systematically evaluate the applicability of existing calculation methods for thermal diffusivity in box girder mass concrete,this study took the zero-block of a long-span cable-stayed bridge box girder as an engineering background.Using the MIDAS FEA platform,finite element simulations of the temperature field during construction were conducted.Two sets of thermal diffusivity values were employed:One inverted using the artificial bee colony algorithm,and the other recommended by current codes.The simulation results were then compared and verified against the field-measured temperature data on site.The results indicate that except for the values specified in GB 50496-2018"Standard for Construction of Mass Concrete",the thermal diffusivity recommended by other current codes leads to simulated temperature responses that deviate significantly from the measured values.In contrast,the thermal diffusivity obtained from the artificial bee colony algorithm yields simulations in good agreement with the measured temperature responses.The findings provide a theoretical basis for the rational selection of thermal diffusivity in temperature field analysis of mass concrete for box girder,and offer a reference for the temperature control design in similar engineering projects.