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Enhancing Ductility of One-Way Concrete Slabs Reinforced with Welded Wire Reinforcement

机译:增强电焊丝增强单向混凝土板的延展性

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摘要

A series of research studies have recently identified an issue called strain localization in welded wire reinforced (WWR) members. This phenomenon reportedly concentrates strains at welded cross wire locations and severely limit ductility. Those that identified the phenomenon used it to imply that WWR is unsafe because it does not warn of failure. This dissertation is investigating details to mitigate the strain localization effect and demonstrate the WWR can be used safely. A moment curvature analysis is developed using Response2000 program and calibrated using experimental data. Parametric study was developed to present a recommendation of details and minimum reinforcement required for WWR slabs. The effect of different types of WWR coating on mechanical properties were investigated. The dissertation next examined the effects of strain rate on the mechanical properties of WWR and traditional rebar.;In total, fifty four slabs have been constructed using WWR and rebar with various cross wire spacing, using a realistic design. The strain localization phenomenon was not demonstrated, but WWR slabs are somewhat less ductile than traditionally reinforced members. The WWR members were shown to provide adequate ductility for warning of impending failure visually and with a well-accepted ductility measure. The WWR members were also shown the ability of load redistribution.;The effect of coating demonstrates that both galvanizing WWR and coating WWR with epoxy has a positive effect on mechanical properties, along with adding corrosion resistance.;The effect of strain rate shows that increase in loading rate tend to increase the yield and ultimate stresses and percent area reduction, however the loading rate increase does not have a significant effect on elastic modulus, elongation and uniform elongation.
机译:最近的一系列研究确定了一个问题,即焊丝增强(WWR)构件中的应变局部化。据报道,这种现象将应力集中在焊接的交叉线位置,并严重限制了延展性。那些发现这种现象的人用它来暗示WWR是不安全的,因为它不会警告失败。本文正在研究减轻应变局部化效应并证明WWR可以安全使用的细节。矩曲率分析是使用Response2000程序开发的,并使用实验数据进行了校准。进行了参数研究,提出了有关WWR平板所需的详细信息和最少加固的建议。研究了不同类型的WWR涂层对机械性能的影响。接下来研究了应变速率对WWR和传统钢筋力学性能的影响。总体上,采用现实设计,使用WWR和不同横线间距的钢筋建造了五十四个平板。应变局部化现象没有得到证实,但是WWR平板的延展性比传统的增强构件要小。已显示WWR成员具有足够的延展性,以视觉方式警告即将发生的故障,并具有公认的延展性措施。 WWR构件还显示了载荷的重新分配能力。涂层的效果表明,镀锌的WWR和用环氧树脂涂层的WWR都对机械性能产生积极的影响,同时增加了耐腐蚀性。加载速率的增加趋向于增加屈服和极限应力并减少面积百分数,但是加载速率的增加对弹性模量,伸长率和均匀伸长率没有显着影响。

著录项

  • 作者

    Shwani, Mohamed K.;

  • 作者单位

    Utah State University.;

  • 授予单位 Utah State University.;
  • 学科 Civil engineering.;Environmental engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 362 p.
  • 总页数 362
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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