Analysis of Vehicle Load Effects on Asymmetric Three-Arch Rib Special-shaped Tied-Arch Bridge
The Qinhuaiwan Bridge is an asymmetric three-arched rib special-shoped tied-arch bridge with a wide steel box girder.Under the action of vehicle loads,the spatial stress distribution of the bridge is quite complex.Based on a refined solid finite element model,three types of vehicle load distribution patterns were considered:symmetric loading across the entire bridge,eccentric loading across the entire bridge,and unilateral eccentric loading.The effects of longitudinal and transverse stresses,deflections,and hanger forces in the main beam under different load distribution patterns were calculated.The comparative analysis of the calculated results indicates that the eccentric loading condition across the entire bridge leads to the maximum stress response in the top and bottom flanges of the main beam,especially at the junction of the arch foot with the top and bottom flanges of the main beam.Under unilateral eccentric load-ing,the degree of torsion is relatively large,with a torsional angle of 0.040°.The hangers on the C cable plane show the greatest response to the action of vehicle loads,and changes in the forces of the C cable plane should be closely monitored in the later period.
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