In the structural design of subway stations with columns,the small axillary angle as a structural measure has little effect on the structural force,so the effect of axillary angle is not considered in the structural calculation.For haunched large-span flat section without the post station,Midas Gen numerical analysis software was used to model and study the stress laws of the roof and side walls under different working conditions for the no axillary angle,ten percent axillary angle,twenty percent axillary angle,and structural center line.A three-dimensional model was constructed considering the effect of large axillary angles for verification.The results show that the large axillary angle plays an important role in pillarless station.Considering the action of large axillary angle,the roof has a certain lifting effect,which can effectively reduce the mid-span bending moment and vertical displacement of the roof.Considering the action of large axillary angle,the bending moment at the junction of side wall and roof is redistributed;the different axillary angle types and dimensions have significant influence on the structural force.
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