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中文摘要：
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。
英文摘要：
In order to study the mechanical response of concrete bridges under close blast loading, this paper employed numerical simulation method to analyze the pressure field distribution on concrete bridges under blast loadings with respect to different scaled distances, over- and underdeck blasts. Then a practical case was studied to verify the simulation results. The results show that the overpressure peak will be increased significantly with the decrease of scaled distance but considerable distortion effect should be taken into account due to the scale of detonation; for an under-deck blast, multi-reflection and confinement effect mainly contribute to the overpressure distribution in the inner space between girders, and the closer to the flanges, the more obvious the confinement effect; for an over-deck blast induced by a truck-bomb, the carriage steel will disturb significantly the shock wave propagation, which may result in shear damage, shear-flexural damage, flexural and/or direct shear damage in different deck areas.
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