English：

In order to study the lateral distribution coefficient of steel-UHPC composite box girder, afinite element analysis model was established, and the finite element analysis model was compared withthe test results of relevant literature to verify the correctness of the finite element model. On this basis, afinite element analysis model for the lateral distribution coefficient of a steel-UHPC composite box girderbridge formed by multiple main beams was established, and compared with existing theoretical analysismethods. A torsional correction coefficient of the main beam based on the modified eccentric pressuremethod was proposed. The calculation results indicate that it is feasible to use the modified eccentricpressure method to calculate the lateral distribution coefficient of the steel-UHPC composite box girderbridge, and the torsional correction coefficient of the main girder is 0.3. When the width to span ratio ofa bridge is less than or equal to 0.5, the modified eccentric pressure method is more reasonable than theeccentric pressure method. When the width to span ratio of a bridge is greater than 0.8, both theeccentric pressure method and the modified eccentric pressure method are no longer applicable forcalculating the lateral distribution coefficient of load in composite box girders. The compressive strengthand thickness of UHPC bridge deck slab do not affect the load lateral distribution coefficient. When theload position changes from 1 / 4 span section to mid span section, both the eccentric pressure method andthe modified eccentric pressure method can be used to calculate the lateral distribution coefficient of theload for the mid beam. For other main girders, the modified eccentric pressure method is recommended for calculation.