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Inelastic deformation and failure of partially strengthened profiled blast walls

机译：部分加固的爆破墙的非弹性变形和破坏

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摘要

An integral part of a typical offshore module is the surrounding profiled blast walls that separate the potentially hazardous regions of the topside. Many of the blast walls in operation were designed to resist lower loads than those envisaged today [1 ] rendering them currently non-functional, thus it is desirable to upgrade their blast resistance in a cost-effective and non-intrusive manner. One proposal is to retrofit the existing blast walls partially with centrally located composite patches. This study presents the development of a rapid assessment tool which provides understanding of the effect of a composite patch on the blast resistance of profiled blast walls. The tool is based and is an improvement upon a previous analytical formulation for unstrengthened walls with realistic connection systems [2]. Numerical simulations of a proposed retrofitted wall are performed to gain insight into the failure progression of the wall. Damage in the composite patch is modelled using the Hashin damage model, and the numerical simulations showed that fibre fracture did not occur and that the small amounts of matrix failure occurring at the composite patch edges did not result in significant loss of in-plane stiffness and strength. Based on these observations the rapid assessment tool, analytically formulated to incorporate the effect of the composite patch which strengthens the wall and moves the plastic hinge locations away from the wall centre to the composite-steel edge, is deemed a suitable tool. The assessment tool and the numerical simulations are partially validated by the experimental results presented in [1] for unstrengthened blast walls. The tool runs quickly and provides reasonable predictions for the deformation response of the walls, and enables the user to quickly assess the effect of adding a composite patch. It allows for multiple deformation modes in the panels and the development of plastic hinges at the composite-steel edges and the wall connections, providing a significant advantage over conventional single-degree-of-freedom models. The numerical simulations and the rapid assessment tool give reasonable agreement for different loading regimes, given the anticipated use of the analytical approach.
机译：典型海上模块的一个组成部分是周围的异形爆破墙，这些爆破墙分隔了顶侧的潜在危险区域。设计中的许多爆破墙设计用于抵抗比当今设想的更低的载荷[1]，从而使其目前无法正常工作，因此，希望以经济高效且非侵入的方式提高其爆破性能。一种提议是用位于中心的复合材料块来部分改造现有的爆破墙。这项研究提出了一种快速评估工具的发展，该工具可帮助您了解复合补片对异型爆炸墙的抗爆炸性的影响。该工具基于先前的分析公式，是对具有实际连接系统的未加固墙的分析公式的改进[2]。对建议的翻新墙进行了数值模拟，以深入了解墙的破坏进程。使用Hashin损伤模型对复合贴片中的损伤进行建模，数值模拟表明未发生纤维断裂，并且在复合贴片边缘处发生的少量基体破坏不会导致面内刚度和强度。基于这些观察结果，快速评估工具被认为是一种合适的工具，该评估工具经过分析制定，以体现复合补片的作用，该补片可增强墙壁强度并使塑料铰链位置从墙壁中心移至复合材料钢边缘。评估工具和数值模拟在[1]中针对未增强的爆破墙的实验结果得到了部分验证。该工具可以快速运行并为墙的变形响应提供合理的预测，并使用户能够快速评估添加复合贴片的效果。它允许面板中出现多种变形模式，并在复合钢边缘和墙壁连接处开发塑料铰链，与传统的单自由度模型相比，具有明显的优势。在预期使用分析方法的情况下，数值模拟和快速评估工具为不同的加载方式提供了合理的一致性。

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  • 来源
    《Engineering Structures》 |2013年第1期|671-686|共16页
  • 作者

    E. Nwankwo; A. Soleiman Fallah; G.S. Langdon; L.A. Louca;

  • 作者单位

    Department of Civil and Environmental Engineering, Skempton Building, South Kensington Campus, Imperial College, London SW7 2AZ, UK;

    Department of Civil and Environmental Engineering, Skempton Building, South Kensington Campus, Imperial College, London SW7 2AZ, UK;

    Blast, Impact and Survivability Research Unit (BISRU), Department of Mechanical Engineering, University of Cape Town, Private Bag, Rondebosch 7701, South Africa;

    Department of Civil and Environmental Engineering, Skempton Building, South Kensington Campus, Imperial College, London SW7 2AZ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hybrid; composite; strengthening; blast resistant design; analytical model; finite elements method;

    机译：杂种综合;强化;防爆设计;分析模型有限元法;

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