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波形钢腹板组合箱梁振动频率分析与试验

, PP. 102-107

Keywords: 桥梁工程,波形钢腹板组合箱梁,能量变分法,振动频率

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Abstract:

？为了获得波形钢腹板混凝土组合箱梁弯曲振动频率的解析公式,运用能量变分法与Hamilton原理建立了该类型箱梁弯曲振动的控制微分方程和自然边界条件。利用控制微分方程,得到了3个广义位移函数W(x),φ(x),ξ(x)的表达式,并代入到相应的自然边界条件中,得到了波形钢腹板混凝土组合箱梁在简支体系下弯曲振动频率的解析公式。对解析公式分析可知,箱梁剪力滞效应、波形钢腹板的剪切效应以及两者的耦合效应是影响其弯曲振动频率的3个重要因素。采用有限元方法和室内模型试验验证了所得解析公式的正确性。研究结果表明:剪力滞效应与耦合效应对该类型箱梁弯曲振动频率的影响较小,而波形钢腹板的剪切效应对该类型箱梁弯曲振动频率的影响显著。

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