圆形中空夹层钢管超高性能钢纤维混凝土柱抗爆性能野外实验与数值模拟

发布时间：2018-05-09 09:01

本文选题：中空夹层钢管超高性能钢纤维混凝土 + 爆炸荷载　；参考：《爆炸与冲击》2017年04期

【摘要】：通过6根圆形中空夹层钢管超高性能钢纤维混凝土(UHPSFRCFDST)柱爆炸破坏实验,研究了轴压、折合距离、空心率和迎爆面形状对其动态响应及损伤破坏的影响,并运用LS-DYNA软件建立了爆炸荷载作用下UHPSFRCFDST柱动态响应的有限元模型。在验证了模型有效性的基础上,运用参数化分析方法,研究了轴压比、空心率、含钢率、内层和外层钢管径厚比及其强度等关键参数对圆形UHPSFRCFDST柱抗爆性能的影响。结果表明:有限元模型能够有效地分析UHPSFRCFDST柱在爆炸荷载作用下的动态响应及损伤破坏;在小于临界轴压时,提高轴压比能够提升UHPSFRCFDST柱抗爆性能,但超过临界轴压后继续提高反而会加重其损伤破坏;减小空心率或内、外层钢管径厚比均可有效提升UHPSFRCFDST柱的抗爆性能,提高含钢率或外层钢管强度也能达到相同效果,但提高内层钢管强度对其抗爆性能的提升作用并不显著。
[Abstract]:The effects of axial compression, folding distance, hollow ratio and the shape of explosion face on the dynamic response and damage failure of UHPSFRCFDST columns are studied through the explosion failure experiments of six circular hollow sandwich steel tube columns with ultra-high performance steel fiber reinforced concrete (SFRC). The finite element model of the dynamic response of UHPSFRCFDST column under explosive load is established by using LS-DYNA software. Based on the validity of the model, the effects of the key parameters, such as axial compression ratio, air heart rate, steel content, diameter to thickness ratio of inner and outer steel pipe and their strength, on the anti-explosion performance of circular UHPSFRCFDST columns were studied by means of parameterized analysis method. The results show that the finite element model can effectively analyze the dynamic response and damage failure of UHPSFRCFDST columns under explosive loading, and improve the anti-explosion performance of UHPSFRCFDST columns when the axial compression ratio is less than critical axial compression. However, if it continues to increase beyond the critical axial pressure, it will aggravate the damage and damage. Reducing the air heart rate or the ratio of diameter to thickness of outer steel tube can effectively enhance the anti-explosion performance of UHPSFRCFDST columns, and increase the steel content or the strength of the outer steel tube can also achieve the same effect. However, improving the strength of inner steel tube has no significant effect on its anti-explosion performance.
【作者单位】：天津大学建筑工程学院;天津城建大学天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金面上项目(51278326) 国家科技支撑计划重点项目(2012BAJ07B05) 天津市科技支撑计划重点项目(14ZCZDSF00016)
【分类号】：TU352.13;TU398.9

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