计算力学学报2026，Vol.43Issue(3)：481-488,8.DOI:10.7511/jslx20250416005
钢箱梁剪滞分析的剪切和面积等效法对比研究
Comparative study on shear analogy method and equivalent area method for shear lag analysis of steel box girders
摘要
Abstract
To accurately analyze the shear lag effect of ribbed steel box girders under vertical symmetric loads,this study selects the shear-lag-induced additional deflection as the generalized displacement and employs the energy variational method to establish a universal analytical solution for the shear lag effect in steel box girders.Based on the shear flow distribution pattern between U-ribs and the top plate,a shear equivalence method for shear lag analysis of ribbed steel box girders is proposed by integrating shear deformation compatibility conditions and displacement continuity requirements.Leveraging the existing area equivalence method in the literature,with the rib area ratio as the fundamental parameter,the impacts of shear and area equivalence on the accuracy of shear lag effect analysis in steel box girders are comparatively analyzed.Numerical case studies demonstrate that the analytical solution for the shear lag effect in steel box girders calculated by the shear equivalence method aligns better with finite element solutions.As the rib area ratio increases,the discrepancy ratio in shear lag effect calculations between shear and area equivalence methods grows.When the rib area ratio reaches 26％,the longitudinal stress discrepancy ratios at the rib location of the top plate in the mid-span section of simply supported and continuous steel box girders calculated by the two methods are 11.70％and 11.50％,respectively,while the corresponding deflection discrepancy ratios at the mid-span section are 10.25％and 10.18％,respectively.关键词
钢箱梁/剪滞效应/能量变分法/剪切变形/面积等效/参数分析Key words
steel box girder/shear lag effect/energy variational principle/shear deformation/equivalent area method/parametric analysis分类
数理科学引用本文复制引用
赵培培,张玉元,张元海,樊江,武维宏..钢箱梁剪滞分析的剪切和面积等效法对比研究[J].计算力学学报,2026,43(3):481-488,8.基金项目
国家自然科学基金(52368020) （52368020）
甘肃省高校青年博士支持项目(2024QB-047)资助. （2024QB-047）
