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为了克服基于应力的传统剪力滞系数的缺陷,提出了基于挠度的剪力滞系数。以剪力滞效应下箱型梁的附加挠度代替传统的剪力滞函数,建立箱梁翼板截面的纵向位移表达式;根据能量变分法建立了箱梁在剪力滞效应下的挠度计算表达式。利用挠度和附加挠度定义了箱型梁截面的剪力滞系数,据此分析了不同支撑条件对箱型梁剪力滞效应的影响。研究结果表明,基于应力的传统剪力滞系数难以正确反映箱梁截面的剪力滞效应,本文建立的基于挠度的剪力滞系数正确揭示了如下规律:剪力滞效应与箱梁支撑条件密切相关,固定端的剪力滞效应最大,简支端次之,自由端最小,而且距受约束边界越远,剪力滞效应越小。
In order to overcome the defect of the traditional shear lag coefficient based on stress, the shear lag coefficient based on deflection is proposed. Based on the energy variation method, the deflection of the box beam under the shear lag effect is established based on the additional deflection of the box beam instead of the traditional shear lag function under the shear lag effect. expression. Deflection coefficient and additional deflection are used to define the shear lag coefficient of the box girder section. Based on this, the influence of different supporting conditions on the shear lag effect of the box girder beam is analyzed. The results show that the traditional shear lag coefficient based on stress can not correctly reflect the shear lag effect of the box girder section. The shear lag coefficient based on the deflection established in this paper correctly reveals the following laws: The shear lag effect is closely related to the support condition of the box girder The shear lag effect of the fixed end is the largest, followed by the simple support, the minimum free end, and the farther away from the constrained boundary, the smaller the shear lag effect.