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 ORCID:

Fei ZHOU

https://orcid.org/0000-0001-6368-0259

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Journal of Zhejiang University SCIENCE A 2024 Vol.25 No.8 P.650-669

http://doi.org/10.1631/jzus.A2300338


Numerical study on local failures of reinforced concrete slabs against underwater close-in explosions


Author(s):  Fei ZHOU, LI Hedong, WU Hao

Affiliation(s):  College of Civil Engineering, Tongji University, Shanghai 200092,, China; more

Corresponding email(s):   wuhaocivil@tongji.edu.cn

Key Words:  Reinforced concrete slab (RC), Underwater close-in (UWCI) explosion, Saturated concrete, Failure modes, Numerical simulation


Fei ZHOU, LI Hedong, WU Hao. Numerical study on local failures of reinforced concrete slabs against underwater close-in explosions[J]. Journal of Zhejiang University Science A, 2024, 25(8): 650-669.

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Abstract: 
Reinforced concrete (RC) slabs are the primary load-carrying member of underwater facilities. They can suffer severe local failures such as cratering, spalling, or breaching as a result of underwater close-in (UWCI) explosions. In this study, we established a fully validated high-fidelity finite element analysis approach to precisely reproduce the local failures of RC slabs after a UWCI explosion. A recently proposed dynamic constitutive model is used to describe wet concrete. The effects of free water content on the material properties, including the tensile/compressive strength, elastic modulus, strain rate effect, failure strength surface, and equation of state, are comprehensively calibrated based on existing test data. The calibrated material parameters are then verified by a single-element test. A high-fidelity finite element analysis (FEA) approach of an RC slab subjected to a UWCI explosion is established using an arbitrary Lagrangian-Eulerian (ALE) algorithm. Simulating previous UWCI explosion tests on RC orifice targets and underwater contact explosion tests on saturated concrete slabs showed that the established FEA approach could accurately reproduce the pressure-time history in water and damage patterns, including the cracking, cratering, and spalling, of the RC orifice target and saturated concrete slab. Furthermore, parametric studies conducted by simulating an RC slab subjected to a UWCI explosion showed that: (i) the local failure of an RC slab enlarges with increased charge weight, reduced standoff distance, and reduced structural thickness; (ii) compared to a water-backed RC slab, an air-backed RC slab exhibits much more obvious local and structural failure. Lastly, to aid the anti-explosion design of relevant underwater facilities, based on over 90 simulation cases empirical formulae are summarized to predict local failure modes, i.‍e., no spall, spall, and breach, of water- and air-backed RC slabs subjected to a UWCI explosion.

水中近场爆炸下钢筋混凝土板局部破坏模式数值模拟研究

作者:周飞1,李贺东2,吴昊1
机构:1同济大学,结构防灾减灾工程系,中国上海,200092;2浙江理工大学,建筑工程学院,中国杭州,310018
目的:钢筋混凝土板是水下设施的主要承重构件,在水中近场爆炸下可能遭受严重的局部破坏,如开坑、震塌及开裂。本文旨在通过高精度数值仿真方法探讨水中近场爆炸下爆距、炸药质量、结构厚度和结构背面空气/水介质对混凝土板损伤破坏的影响规律,并总结水中近场爆炸下混凝土板破坏模式评估公式。
创新点:1.采用作者前期建立的新型混凝土动态本构模型,系统标定了含水混凝土本构模型参数;2.采用任意拉格朗日-欧拉算法,建立钢筋混凝土板在水中近场爆炸下的高精度模拟方法;3.建立水中近场爆炸下钢筋混凝土板损伤破坏分析模型,开展参数分析并归纳出损伤破坏评估方法。
方法:1.基于现有试验数据,对自由水含量对混凝土的抗拉/抗压强度、弹性模量、应变率效应、强度面和状态方程的影响进行综合标定;2.通过模拟现有混凝土隧洞靶的水中近场爆炸试验和混凝土板的水下接触爆炸试验,对所建立的有限元分析方法再现水中爆炸荷载以及混凝土的开坑、开裂等损伤破坏的能力进行验证;3.通过参数分析,明确爆距、炸药质量、结构厚度和结构背面空气/水介质对混凝土板损伤破坏的影响规律;4.基于大量仿真分析,归纳出水中近场爆炸下混凝土板破坏模式评估公式。
结论:1.系统标定的本构模型参数可准确描述饱和混凝土的动态力学性能;2.建立的高精度数值模拟方法可准确描述近场爆炸作用下混凝土板的开坑、开裂及震塌破坏;3.水中近场爆炸下混凝土板的局部破坏随着炸药质量的增加、爆距的减小和结构厚度的减小而增大;4.与背面水介质相比,背面空气介质的混凝土板损伤破坏显著增加;5.归纳的水中近场爆炸作用下混凝土板损伤评估方法,可用于相关水下设施的抗爆设计。

关键词:钢筋混凝土板;水中近场爆炸;饱和混凝土;破坏模式;数值仿真

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]AttardMM, SetungeS, 1996. Stress-strain relationship of confined and unconfined concrete. ACI Materials Journal, 93(5):432-442.

[2]ChenZJ, ZongZH, GanL, et al., 2023. Numerical investigation on dynamic response of air-backed RC slabs subjected to close-in underwater explosion. Ocean Engineering, 273:113962.

[3]ColeRH, 1948. Underwater Explosions. Princeton University Press, New Jersey, USA.

[4]Comite Euro-International Du Beton, 1993. CEB-FIP Model Code 1990: Design Code. London, UK.

[5]CostanzoFA, 2011. Underwater explosion phenomena and shock physics. In: Proulx T (Ed.), Structural Dynamics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, USA.

[6]ForquinP, SallierL, PontiroliC, 2015. A numerical study on the influence of free water content on the ballistic performances of plain concrete targets. Mechanics of Materials, 89:176-189.

[7]HallquistJ, 2006. LS-DYNA Theory Manual. Livermore Software Technology Corporation, Livermore, California, USA.

[8]HuJ, ChenZY, ZhangXD, et al., 2017. Underwater explosion in centrifuge part I: validation and calibration of scaling laws. Science China Technological Sciences, 60(11):1638-1657.

[9]HuangXP, HuJ, ZhangXD, et al., 2020. Bending failure of a concrete gravity dam subjected to underwater explosion. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 21(12):976-991.

[10]KlepaczkoJR, BraraA, 2001. An experimental method for dynamic tensile testing of concrete by spalling. International Journal of Impact Engineering, 25(4):387-409.

[11]KongXZ, FangQ, ChenL, et al., 2018. A new material model for concrete subjected to intense dynamic loadings. International Journal of Impact Engineering, 120:60-78.

[12]KumarV, KartikKV, IqbalMA, 2020. Experimental and numerical investigation of reinforced concrete slabs under blast loading. Engineering Structures, 206:110125.

[13]LiHD, LiYB, PanYF, et al., 2023. Compressive properties of a novel slurry-infiltrated fiber concrete reinforced with arc-shaped steel fibers. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 24(6):543-556.

[14]MagnusD, KhanMA, ProudWG, 2018. Epidemiology of civilian blast injuries inflicted by terrorist bombings from 1970‒2016. Defence Technology, 14(5):469-476.

[15]MalecotY, ZinggL, BriffautM, et al., 2019. Influence of free water on concrete triaxial behavior: the effect of porosity. Cement and Concrete Research, 120:207-216.

[16]MalvarLJ, CrawfordJE, WesevichJW, et al., 1997. A plasticity concrete material model for DYNA3D. International Journal of Impact Engineering, 19(9-10):847-873.

[17]McVayMK, 1988. Spall Damage of Concrete Structures. Technical Report SL-88-22, US Army Corps of Engineers, Waterways Experiment Station, Vicksburg, USA.

[18]Nord Stream Press Releases, 2022. Incident on the Nord Stream Pipeline, 2022-11-14. https://www.nord-stream.com/press-info/press-releases/

[19]RajendranR, LeeJM, 2009. Blast loaded plates. Marine Structures, 22(2):99-127.

[20]RossCA, JeromeDM, TedescoJW, et al., 1996. Moisture and strain rate effects on concrete strength. ACI Materials Journal, 93(3):293-300.

[21]SandersJ, UrgessaG, LöhnerR, 2021. Literature review on the response of concrete structures subjected to underwater explosions. CivilEng, 2(4):895-908.

[22]ShiYC, ChenL, WangZQ, et al., 2015. Field tests on spalling damage of reinforced concrete slabs under close-in explosions. International Journal of Protective Structures, 6(2):389-401.

[23]ShiYC, WangJ, CuiJ, 2020. Experimental studies on fragments of reinforced concrete slabs under close-in explosions. International Journal of Impact Engineering, 144:103630.

[24]Southpointe, 2020. ANSYS Explicit Dynamics Analysis Guide. ANSYS, Inc, Canonsberg, USA.

[25]TuZG, LuY, 2009. Evaluation of typical concrete material models used in hydrocodes for high dynamic response simulations. International Journal of Impact Engineering, 36(1):132-146.

[26](Unified Facilities Criteria)UFC, 2008. UFC 3-340-02 Structures to Resist the Effects of Accidental Explosions, with Change 2. UFC, Department of Defense, USA. https://wbdg.‍org/ffc/dod/unified-facilities-criteria-ufc/ufc-3-340-02

[27]WangH, WangLC, SongYP, et al., 2016. Influence of free water on dynamic behavior of dam concrete under biaxial compression. Construction and Building Materials, 112:222-231.

[28]WangW, ZhangD, LuFY, et al., 2012. Experimental study on scaling the explosion resistance of a one-way square reinforced concrete slab under a close-in blast loading. International Journal of Impact Engineering, 49:158-164.

[29]WenYB, ChiH, LaiZC, et al., 2023. Experimental and numerical investigation on saturated concrete subjected to underwater contact explosion. Construction and Building Materials, 384:131465.

[30]WuSX, ChenXD, ZhouJK, 2012. Influence of strain rate and water content on mechanical behavior of dam concrete. Construction and Building Materials, 36:448-457.

[31]XuH, WenHM, 2013. Semi-empirical equations for the dynamic strength enhancement of concrete-like materials. International Journal of Impact Engineering, 60:76-81.

[32]XuSL, WuP, ZhouF, et al., 2020. A dynamic constitutive model of ultra high toughness cementitious composites. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 21(12):939-960.

[33]YangGD, WangGH, LuWB, et al., 2019. Experimental and numerical study of damage characteristics of RC slabs subjected to air and underwater contact explosions. Marine Structures, 66:242-257.

[34]YangGD, FanY, WangGH, et al., 2022. Blast resistance of air-backed RC slab against underwater contact explosion. Defence Technology, 28:236-250.

[35]YangGD, FanY, WangGH, et al., 2023a. Experimental and numerical investigation on dynamic behavior of RC orifice targets subjected to underwater explosions. Engineering Structures, 279:115541.

[36]YangGD, FanY, WangGH, et al., 2023b. Mitigation effects of air-backed RC slabs retrofitted with CFRP subjected to underwater contact explosions. Ocean Engineering, 267:113261.

[37]ZhaoFQ, WenHM, 2018. Effect of free water content on the penetration of concrete. International Journal of Impact Engineering, 121:180-190.

[38]ZhaoXH, WangGH, LuWB, et al., 2018. Damage features of RC slabs subjected to air and underwater contact explosions. Ocean Engineering, 147:531-545.

[39]ZhaoXH, WangGH, LuWB, et al., 2021. Experimental investigation of RC slabs under air and underwater contact explosions. European Journal of Environmental and Civil Engineering, 25(1):190-204.

[40]ZhouF, ChengYH, PengQ, et al., 2023a. Influence of steel reinforcement on the performance of an RC structure subjected to a high-velocity large-caliber projectile. Structures, 54:716-731.

[41]ZhouF, SuQ, ChengYH, et al., 2023b. Novel constitutive model of UHPC under impact and blast loadings considering compaction of shear dilation. International Journal of Impact Engineering, 173:104468.

[42]ZhouF, SuQ, ChengYH, et al., 2023c. A novel dynamic constitutive model for UHPC under projectile impact. Engineering Structures, 280:115711.

[43]ZhouF, WuH, ChengYH, 2023d. Perforation studies of concrete panel under high velocity projectile impact based on an improved dynamic constitutive model. Defence Technology, 27:64-82.

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