爆炸荷载下装配式钢筋混凝土梁动力响应及抗爆性能研究

Study on Dynamic Response and Anti-explosion Performance of Prefabricated Reinforced Concrete Beams Under Blast Load

为了研究灌浆套筒连接的装配式钢筋混凝土梁的抗爆性能,建立了装配式钢筋混凝土梁的数值模型,采用多物质流固耦合算法,分析装配式钢筋混凝土梁在爆炸荷载作用下的破坏形态和动态响应,通过参数化分析方法,研究了混凝土强度和纵筋配筋率以及炸药位置等因素对装配式梁抗爆性能的影响。结果表明:对于装配式钢筋混凝土梁,由于拼装位置处存在新旧混凝土的薄弱接触面,在爆炸荷载下应力波在梁内传递性能减弱,冲击力不能有效地传递给梁两侧,导致局部发生较严重的脆性破坏。提高混凝土强度和纵筋配筋率、改变炸药爆炸位置均能改善装配式钢筋混凝土梁的抗爆性能。

In order to study the anti-explosion performance of prefabricated reinforced concrete beams connected by grouting sleeve,a numerical model of prefabricated reinforced concrete beams was established.The failure modes and dynamic responses of prefabricated reinforced concrete beams under blast loads were analyzed by using multi-material fluid-structure coupling algorithm.The effects of concrete strength,longitudinal reinforcement ratio and explosive position on the anti-explosion performance of prefabricated beams were studied.The results show that for the prefabricated reinforced concrete beam,because there is a weak interface between old and new concrete at the assembled position,the transmission performance of stress wave in the beam is weakened under the explosion load,and the impact force cannot be effectively transmitted to both sides of the beam,leading to serious brittle failure in the local area.Increasing concrete strength,longitudinal reinforcement ratio and changing explosive position can improve the anti-explosion performance of prefabricated reinforced concrete beams.