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通过分析能量变分原理求解薄壁箱梁剪力滞效应的基本假设,并结合弹性力学中平面应力问题的几何和物理方程,分析薄壁箱梁各板件应力应变关系中弹性模量的合理取值问题,与已有大多数文献中对弹性模量的取值方式相比,按本文修正后的弹性模量的计算结果,能够更好地反映薄壁箱梁剪力滞翘曲的实际情况。材料泊松比是影响两种取值方式的重要因素。通过简支梁算例,对比常用工程材料的不同泊松比数值表明,采用两种取值方式计算所得的应力差值比的最大值均不超过5%,因而,工程实际中按照不修正的简单方式取值也是可行的。
By analyzing the basic assumption of shear lag effect of thin-walled box girder by analyzing the principle of energy variation and combining with the geometrical and physical equations of the plane stress problem in elasticity, the elastic modulus in the stress-strain relationship of the thin-walled box girder is analyzed Compared with the existing methods for calculating the elastic modulus in most literatures, the calculation results of the elastic modulus corrected in this paper can better reflect the actual situation of the shear lag warpage of thin-walled box girder Happening. Material Poisson's ratio is an important factor affecting the two values. Comparing the Poisson's ratio values of commonly used engineering materials with simple beam examples, it is shown that the maximum value of the stress difference ratios calculated by the two methods is no more than 5%. Therefore, according to the uncorrected The simple way to value is also feasible.