In order to fully understand the structural performance of continuous U-beams,based on the(35+50+35)m double-line continuous U-beams of the Nanjing-Jurong intercity rail transport engineering,midas Civil and midas FEA are used to build the planar rod model and the three-dimensional solid model respectively.The structural calculations and results of the two models are compared with the construction monitoring data.Analysis shows that the overall trend of results from both the rod and solid models aligns with monitoring data,but the rod model does not account for the shear lag effect on stress dis-tribution across the section,leading to conservative results.The calculation results of the solid model align more closely with the actual situation and can accurately reflect the real stress distributions.By comparing stress distributions under various load conditions in the solid model,the effective width reduction coefficients for the cross-section were derived and applied to adjust the cross-section in the rod model.This confirms the rationality of the effective width and yields a simplified calcula-tion method for the rod model of the"double U+box"composite section continuous U-beams with effective width considered.
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