rigid arch bridges;  load transverse distribution coefficient;  structural analysis;  The law of change

Combined with the structural characteristics of rigid arch bridge, ANSYS is used to establish its spatial structure analysis model, using the deflection method to find the lateral distribution coefficient of the load at each calculation point, and drawing various charts according to the calculation results, the results show that the transverse distribution coefficient of the load of the rigid arch bridge has different longitudinal and transverse changes along the longitudinal and transverse laws of the bridge, and when a single transverse load transverse distribution coefficient is calculated, it will have a large deviation from the actual situation. The basic value principle of the transverse load distribution coefficient in the simplified calculation of rigid arch bridge is summarized: the transverse distribution coefficient of the span load of the secondary side arch piece can be calculated by taking the solid abdominal section beam and the middle abdominal hole beam and the main arch leg (including arch foot). The lateral load distribution coefficient obtained by the middle arch support point and the lever principle method can be safely calculated by the side ventral beam.