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Reinforced Concrete Structural Members Under Impact Loading.

机译：冲击荷载下的钢筋混凝土结构构件。

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摘要

The present research investigates the response of load bearing reinforced concrete structural members, and proposes design of deployable honeycomb energy absorber to shield and protect the structures against extreme loading events such as impact and blast loadings. Application of CFRP-composite sheets and honeycomb cellular structure were studied to reduce the damages to the structural members caused by impact loading. This study involves development of three-dimensional complex nonlinear finite element analysis models of as-built and CFRP-strengthened reinforced concrete structural members such as solid slab and slab with openings, beam, single hammerhead bridge pier column, and honeycomb cellular structure using ANSYS and LS-DYNA software programs at the Ohio Supercomputer Center. Finite element results of the proposed models indicated that: (1) Slabs with multiple rectangular and elliptical shape openings with aspect ratio greater than one outperformed the slabs with circular, square, and diamond shape single opening in terms of floor stiffness, and ultimate flexural strength capacity. (2) Peak dynamic impact force of the pier surpassed the AASHTO impact design force. CFRP-wraps applied to the pier helped to contain incurred localized damage and to redistribute the effect of vehicular impact load. (3) U-shaped and complete wrap strengthening were effective in improving the response of reinforced concrete beams under drop hammerhead impact loading. It was observed that the CFRP energy absorption capacity did not vary linearly with the drop hammerhead height and the optimum amount of CFRP-composite energy absorption capacity was governed by the amount of tensile steel bars. (4) Proposed concrete damage scale model improved the concrete softening behavior in the descending branch of the stress-strain curve, and reduced the number of input parameters by 33--52% for the four concrete material models implemented in LS-DYNA software program. (5) Proposed deployable honeycomb energy absorbers DEA-I, DEA-II, and DEA-III increased energy dissipation by 256 to 393% and mean crushing strength by 296 to 429%.
机译：本研究调查了承重钢筋混凝土结构构件的响应，并提出了可展开蜂窝式能量吸收器的设计，以屏蔽和保护结构免受极端载荷事件（例如冲击和爆炸载荷）的影响。研究了CFRP复合板和蜂窝状蜂窝结构的应用，以减少冲击载荷对结构构件的破坏。这项研究涉及使用ANSYS和三维有限元分析对已建成和CFRP加固的钢筋混凝土结构构件（如实心板和带孔板，梁，单锤头桥墩柱和蜂窝蜂窝结构）进行三维复杂非线性有限元分析模型。俄亥俄州超级计算机中心的LS-DYNA软件程序。提出的模型的有限元结果表明：（1）纵横比大于1的具有多个矩形和椭圆形开口的平板在地板刚度和极限抗弯强度方面优于圆形，正方形和菱形单个开口的平板容量。 （2）桥墩的峰值动态冲击力超过了AASHTO冲击设计力。应用于码头的CFRP包裹有助于抑制局部损坏并重新分配车辆冲击载荷的影响。 （3）U形和完全包裹加固有效地改善了落锤头冲击载荷下钢筋混凝土梁的响应。可以看出，CFRP能量吸收能力不会随着锤头高度的下降而线性变化，而CFRP复合能量吸收能力的最佳量取决于抗拉钢筋的数量。 （4）对于LS-DYNA软件程序中实现的四种混凝土材料模型，拟议的混凝土破坏规模模型改善了应力-应变曲线下降分支中的混凝土软化行为，并使输入参数的数量减少了33--52％ 。 （5）提议的可展开蜂窝式能量吸收器DEA-I，DEA-II和DEA-III的能量消耗增加了256％至393％，平均抗碎强度增加了296％至429％。

著录项

  • 作者

    Mohammed, Tesfaye A.;

  • 作者单位

    The University of Toledo.;

  • 授予单位 The University of Toledo.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 213 p.
  • 总页数 213
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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