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近场爆炸时混凝土桥梁压力场与响应分析

Keywords: 桥梁工程,混凝土桥梁,数值仿真,近场爆炸荷载,比例距离,约束效应,压力场

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Abstract:

?为研究近场爆炸条件下混凝土桥梁的力学响应,基于爆炸基本理论,采用数值仿真方法,开展不同比例距离、桥面爆炸、桥下爆炸等近场爆炸条件下混凝土桥梁的压力场分布研究,并通过具体的实桥分析验证研究成果的有效性。研究结果表明:在装药量或装药距离相同条件下,比例距离变小,超压峰值将显著增大,装药的缩尺会存在明显的畸变效应;桥梁下方爆炸时梁肋间冲击波多次反射作用和密闭空间约束效应明显,且越接近翼板部位,冲击波的封闭效应越显著;车载炸药在桥面上方爆炸时车体钢板对冲击波传播的阻挡效应非常明显,进而可能使桥面板出现剪切破坏、弯剪破坏、弯曲破坏或直剪破坏等破坏区域。

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