钢纤维高强混凝土墙基于CONWEP的爆炸响应

Blast response of steel fiber reinforced high strength concrete walls based on CONWEP

针对爆炸荷载下的钢纤维高强混凝土墙,采用显式动力有限元分析软件ANSYS/LS-DYNA建立了墙体1/4模型,对墙体在爆炸荷载下的动力响应和破坏形态进行模拟分析.材料模型采用J-H-C模型,该模型考虑了损伤和应变率效应,模型参数利用文献试验数据计算得出,爆炸荷载采用CONWEP爆炸模型,使用*LOAD_BLAST关键字加载.利用数值模型分析了不同折合距离下墙体的破坏模式以及墙体厚度、高跨比、边界条件和折合距离等墙体动力响应的影响因素,结果表明,折合距离较小时墙体发生剪切破坏,折合距离较大时墙体发生弯曲破坏,此外,墙体厚度、边界条件、高跨比和折合距离均对其动力响应产生明显的影响,与钢筋混凝土墙体对比分析发现同等条件下钢纤维高强混凝土墙体中心位移值较小,体现了钢纤维高强混凝土较高的抗拉强度和抗压韧性对其抗爆能力的显著增强作用.

The dynamic response and failure pattern of the SFRHSC wall under explosion load was simulated and was analyzed by using explicit dynamic finite element analysis software ANSYS/LS-DYNA. The 1/4 wall model is established, and the J-H-C model was used as material model which considered damage and strain rate effect. Model parameters were calculated by using the test of literature data, explosion loaded by CONWEP explosion model by using ＊LOAD_BLAST keyword. Different failure modes under different scaled distance were analyzed and factors like thickness of the wall, depth-span ratio, boundary conditions and scaled distance were considered. The results showed that when the scaled distance was small, shear failure occurred, or when the scaled distance was large, bending failure happens. In addition, thickness of the wall, boundary conditions, depth-span ratio and scaled distance have obvious influence on the dynamic response of SFRHSC walls, and compared with reinforced concrete wall, the displacement in the center of the SFRHSC wall is much smaller under the same condition, which shows the high tensile strength and compressive toughness of SFRHSC wall is significantly enhanced the anti-explosion ability of the wall. The research results of this article can provide certain reference to the design offender wall.