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为研究梁格法计算双室箱梁剪力滞效应的精度,采用梁格法建立单箱双室简支箱梁的梁格分析模型,研究了单箱双室箱梁在竖向集中力以及均布荷载作用下的弯曲效应。采用有机玻璃模型进行实测研究,并建立基于板壳有限元的数值计算模型。将梁格解的剪力滞系数与板壳数值解、实验实测的剪力滞系数进行比较,得出的结论主要有:1采用梁格法计算单箱双室箱梁的剪力滞效应时,横截面的剪力滞系数呈台阶状分布,由于台阶数量过少,使得梁格法很难真实反映单箱双室箱梁的剪力滞效应;2集中荷载作用下,梁格法计算的峰值剪力滞系数偏小,跨中顶板截面与实验值最大相差10.5%;3均布荷载作用下,梁格解与板壳数值解的剪力滞系数在跨中顶板截面最大相差20.7%,峰值剪力滞系数的最大差率为-12.9%,且随着宽跨比的减小,梁格解的剪力滞系数逐渐增大。
In order to study the accuracy of calculating the shear lag effect of double-chamber box girder by the beam-grid method, the beam lattice analysis model of single box double-chamber simple box girder is established by using the beam grid method. The effects of vertical concentrated force and uniform load on the single- Under the bending effect. The plexiglass model was used to carry out the measured research, and the numerical calculation model based on the shell and shell finite element was established. The results of the comparison between the shear lag coefficient of the beam lattice and the numerical solution of the shell and the experimental shear lag coefficient are as follows: 1 The beam lag method is used to calculate the shear lag effect of the single-box double- Because of the small number of steps, it is very difficult for the beam method to truly reflect the shear lag effect of single-box double-chamber box girder. Under the action of concentrated load, the peak shear lag coefficient Under the uniform load, the shear lag coefficient of the solutions of the beam lattice and the shell is about 20.7% of the maximum in the mid-span roof cross-section, and the peak shear lag coefficient The maximum rate of difference is -12.9%, and as the ratio of width to span decreases, the shear lag coefficient of the solution increases.