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波纹钢腹板组合箱梁偏心增大系数计算方法

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Keywords: 桥梁工程,偏心增大系数,畸变,波纹钢腹板箱梁,扭转刚度

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Abstract:

为了简化计算波纹钢腹板组合箱梁在汽车偏心荷载作用下的变形和内力,针对波纹钢腹板组合箱梁抗扭刚度较弱,在偏心荷载作用下会产生较大扭转和畸变变形的特点,参考普通混凝土箱梁偏心增大系数的计算原理和方法,针对等高度和变高度2种结构形式的波纹钢腹板箱梁,推导了单位扭矩作用下扭转角和畸变角的解析计算公式,得到了考虑畸变变形情况下波纹钢腹板组合箱梁偏心增大系数的理论计算公式。结合某模型试验结果可以看出,实测值与理论计算值比较接近,误差范围为0.5%12.3%,说明了所推导理论公式的正确性。并且,把试验数据与普通混凝土箱梁偏心增大系数经验值相比较,说明了波纹钢腹板箱梁抗扭刚度较低,由箱梁扭转和畸变会引起较大的偏心增大系数,从而会引起较大的变形和内力,在实际设计中应引起充分重视。

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