冲击荷载下预应力对混凝土板性能的影响

IF 2.1 Q2 ENGINEERING, CIVIL
Vimal Kumar, M. Iqbal, AK Mittal
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引用次数: 0

摘要

通过试验和数值研究,探讨了单向预张拉混凝土板在冲击载荷作用下的性能。比较了先张拉混凝土和未预张拉混凝土的抗冲击性能、试验结果和损伤情况。M40和M60级混凝土的板试件已预拉伸至混凝土抗压强度的10%和20%的预应力水平。同时,未预张拉混凝土中使用的所有钢筋束都保持无应力状态。钢板在跨中被从0.5米高度降至1.0米高度的钢块(242.85公斤)撞击。相应地,考虑到Holmquist–Johnson–Cook(HJC)和混凝土和钢的金属塑性模型,使用显式有限元代码进行了数值模拟。板的性能由混凝土等级、冲击能和混凝土内预应力水平决定。混凝土中的诱导预应力提高了刚度,从而提高了预张拉混凝土板的抗冲击性。因此,与未预张拉的混凝土相比,预张拉混凝土的冲击力相应增加,挠度相应减少18.1%和11.0%。一旦跌落高度从0.5 m增加到1.0 m,板内的劈裂和冲压裂纹就变得明显。模拟估计峰值冲击力和反作用力的偏差分别在19.7%和15.5%以内。位移和能量吸收是使用与实际结果密切相关的分析方法计算的,偏差分别在18%和14%以内。此外,对双向预拉混凝土进行的模拟表明,与单向预拉混凝土相比,板的性能得到了改善,没有开裂,裂缝分布均匀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of prestressing force on performance of concrete plates under impact loading
An experimental and numerical study has been performed to explore the performance of one-way pretensioned concrete plates against impact loading. The impact resistance, experimental results and damage within the pretensioned concrete have been compared with the non-pretensioned concrete. The plate specimens of concrete grades M40 and M60 have been pretensioned to prestress level 10 and 20% of the compressive strength of the concrete. While, all the tendons employed in the non-pretensioned concrete were kept unstressed. The plates were struck at the mid-span by a steel mass (242.85 kg) dropped from 0.5 to 1.0 m heights. The numerical simulations have been executed using explicit finite element code considering the Holmquist–Johnson–Cook (HJC) and the metal plasticity model for concrete and steel, correspondingly. The performance of the plates is governed by the grade of concrete, impact energy and level of the prestress within the concrete. The induced prestress within the concrete enhanced the stiffness and, consequently, the impact resistance of the pretensioned concrete plates. The pretensioned concrete hence witnessed increased impact force and reduced deflection by 18.1% and 11.0%, correspondingly, compared to the non-pretensioned concrete. The splitting and punching crack within the plates became pronounced once the drop height increased from 0.5 m to 1.0 m. The simulations have estimated the peak impact force and reaction within 19.7% and 15.5% deviation, respectively. The displacement and energy absorption have been calculated using an analytical methodology closely correlated with the actual results within 18% and 14% deviation, respectively. Further, the simulations performed on two-way pretensioned concrete have shown improved performance of the plates witnessing no splitting crack and uniform crack distribution compared to one-way pretensioned concrete.
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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