多工况荷载组合作用下预制装配式拱式渡槽力学响应分析OA

This study investigated the mechanical response mechanisms of prefabricated arched aqueducts under multiple load combination conditions.A refined 3D finite element model was developed in ANSYS based on Aqueduct No.1 in the Taisu Main Canal of Hualiangting Irrigation District,simulating four operational scenarios:empty slot,design water depth,full-slot water depth,and seismic action.Deformation fields,stress contours,and internal force transfer paths at critical sections were systematically extracted.Results demonstrate that under full-slot conditions,structural deformation was governed by bending effects induced primarily by static water pressure.The peak mid-span displacement of the aqueduct body reached 17.53 mm,with the arch crown displacement being 66.7%of that value.Concurrently,the axial force at the arch foot reached 5246.9 kN 3.47 times that at the arch crown and the peak compressive and tensile stresses were 11.13 MPa and 1.37 MPa,respectively.Seismic excitation triggers internal force reconstruction,increasing mid-span displacement by 32.1%relative to disign water depth conditions to 18.80 mm yet reversely suppressing crown displacement to 8.36 mm,tensile stress increased to 1.46 MPa and 9.0%reduction in arch-foot axial force.Critical concrete sections comply with SL 191-2008 specifications,evidenced by tensile and compressive safety factors of 1.13(seismic)and 1.65(full-slot).The study revealed the fundamental mechanisms:Seismic loads caused a redistribution of internal forces in the arch structure due to inertia,thereby triggering abnormal displacement,and arch axial forces exhibited nonlinear decay along the catenary axis.These findings provide theoretical foundations for disaster-resilient design of prefabricated aqueduct structures.