接触爆炸荷载下钢-混凝土组合梁的破坏模式研究

Research on the Failure Mode of Steel-Concrete Composite Beam under Contact Detonation

运用LS-DYNA软件对接触爆炸荷载下钢-混凝土组合梁的破坏形式进行了数值分析,研究了混凝土板的破坏过程及梁的破坏模式。结果表明,钢-混凝土组合梁以局部变形为主,混凝土易于破碎,钢梁与混凝土板易丧失共同工作的能力,而接触爆炸荷载下钢-混凝土组合梁主要有三种不同的破坏模式,分别为混凝土板的破碎、钢梁的局部大变形和荷载作用区的局部冲切破坏。

In order to understand the behavior of steel-concrete composite beam subjected to contact blast loading, proper finite element models were constructed and investigated. The failure process of concrete plate and the failure mode of beam were described in detail. It was demonstrated that the local deformation is a main deformation form for the steel-concrete composite beam under contact blast loading. However, steel-concrete composite will lose the ability of working together because the concrete is brittle. The failure of steel-concrete composite beam subjected to contact blast loading can generally be classified into three modes, namely, a direct local failure in concrete plate, flexural failure of steel beam and local punching damage.