爆炸荷载下UHTCC-FRP格栅加固RC板的数值模拟研究  

Numerical Simulation of UHTCC-FRP Grid Reinforced RC Slabs Under Blast Load

作　　者：钟伟 钟正强 Zhong Wei;Zhong Zhengqiang

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《重庆建筑》2023年第10期54-57,共4页Chongqing Architecture

摘　　要：为研究FRP网格-超高韧性水泥基复合材料(UHTCC)加固混凝土板的抗爆性能,用显式动力学软件ANSYS/LS-DYNA,建立了混凝土板、炸药、空气的有限元计算模型,对在空爆作用下未加固以及采用FRP网格-UHTCC加固下的混凝土板的跨中峰值位移以及破坏形态进行了数值模拟,并分析了考虑UHTCC厚度、UHTCC强度、网格间距等加固参数对混凝土板的损伤形态和跨中位移的影响。数值结果显示:混凝土板采用FRP网格-UHTCC加固后抗爆性能提升明显,且UHTCC厚度对混凝土板抗爆性能提升尤为显著,因此,如果想运用这种加固技术提高钢筋混凝土板的抗爆性能,应在规范的要求下,优先考虑增大UHTCC厚度。In order to study the anti-blast performance of FRP grid-ultra-high toughness cement-based composites reinforced concrete slabs(UHTCC),a finite element model consisting of concrete slabs,explosives,and air was established by using the dynamics software ANSYS/LS-DYNA.Numerical simulations were carried out on the mid-span peak displacement and the failure mode of concrete slabs reinforced with FRP grid-UHTCC without reinforcement and with FRP grids under the load of airburst,while analyzing the effect of reinforcement parameters considering UHTCC thickness,UHTCC strength,and grid spacing on the damage pattern and mid-span displacement of the concrete slabs.The numerical results showed that the concrete slab reinforced by FRP grid-UHTCC shows obviously improved anti-explosion performance,and the UHTCC thickness has particularly significant effects on the anti-explosion performance.Therefore,if there is a need to improve the anti-explosion performance of reinforced concrete slabs with such reinforcement technology,priority should be given to increasing the thickness of UHTCC under the requirements of relevant specifications.

关 键 词：钢筋混凝土板 爆炸荷载 FRP网格 超高韧性水泥基复合材料 抗爆性能 

分 类 号：TU375.2[建筑科学—结构工程] U455.6[建筑科学—桥梁与隧道工程]