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通过对大比例双层均布荷载作用下单箱三室混凝土伸臂箱梁在弹性范围内的抗弯性能模型试验研究与分析,探讨了双层均布荷载作用下单箱三室混凝土伸臂箱梁剪力滞效应分布规律:在不同荷载工况作用下,其伸臂根部产生正剪力滞效应,1/2伸臂处产生负剪力滞效应;正、负剪力滞临界位置离伸臂根部的距离是伸臂长度的18%~23%,其中在顶板均布加载作用下产生的剪力滞效应最明显,正、负剪力滞临界位置离伸臂根部最近,顶板、底板同时均布加载作用下次之,而底板均布加载作用下最弱;该双层交通混凝土伸臂箱梁抗弯结构在设计时,按照顶板均布加载时产生的剪力滞效应考虑偏安全。
Through the experimental study and analysis of the flexural behavior of single-box three-chamber concrete extensible box girder with a large proportion of double-layer uniform load in the elastic range, the effects of single layer three-chamber concrete extensible box girder Shear lag effect distribution law: under different load conditions, the positive end of the boom produces positive shear lag effect, 1/2 extension arm negative shear lag effect; positive and negative shear lag critical position of the arm The root distance is 18% ~ 23% of the length of the boom, of which the shear lag effect is most obvious under the uniform load on the roof. The critical position of the positive and negative shear lags is the closest to the root of the boom, The load of cloth is the next, and the load of the floor is the weakest under uniform loading. The flexural structure of the double-decked concrete beam is considered safe in the design according to the shear lag effect when the roof is uniformly loaded.