爆炸荷载作用下钢-混凝土组合梁的动力响应及破坏形态分析

本文利用LS-DYNA软件对同冲量不同超压峰值不同时间的三种荷载工况下钢-混凝土组合梁的动力响应及破坏模式进行了研究对比，并对梁的变形过程、关键位置点的位移、速度、支座剪力和跨中弯矩进行了详细的分析。结果表明，在爆炸冲击波下，开始阶段混凝土板对钢梁有很好的保护作用，但混凝土易于破碎，钢-混凝土组合梁容易丧失共同工作的能力，剪切破坏是钢-混凝土组合梁的一种重要破坏形式。

Research on the Characteristics of Steel-Concrete Composite Beams Subjected to Blast Loading

In order to understand the behavior of steel-concrete composite beams subjected to explosion loading,proper finite element modes are constructed and investigated under three kinds of blast loading which have the same impulse pattern but different maximum pressure and duration time.The process of deformation of the beams,the displacement and velocity at the main key points of the beams,support shear force and mid-span bending moment are described in detail.It is demonstrated that the steel beam can be protected by the composite concrete plate at beginning.However,the steel-concrete composition will loss the ability of working together because the concrete is liable to brittle.Shear failure is an important failure form for steel-concrete composite beams under blast loading.