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Simulation of RC beams with mechanically fastened FRP strips

机译：机械固定的FRP条带模拟RC梁

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摘要

A common approach to the strengthening of RC beams is by attaching fibre reinforced polymer (FRP) strips to the beams' soffit by either externally bonding (EB), or rapid attachment with mechanical fasteners (MF). Simulating an RC beam with an MF-FRP strip is complex as a full member analysis is required to determine the developed strains in the FRP strip between fasteners. Moreover, as no direct interaction between the concrete and strip exists, strain compatibility does not apply and thus a conventional full-interaction (FI) approach becomes reliant on an empirically derived member behaviour. This paper presents a member analysis in which a segmental M/θ approach is used to determine beam deformations and forces in beams with prestressed and unprestressed MF-FRP strips. Being mechanics based the approach incorporates residual strain partial-interaction (PI) theory to directly simulate the effects of tension-stiffening and a size-dependent stress-strain model to simulate the concrete wedge formation associated with concrete softening. Furthermore PI theory allows directly for the influence of concrete creep and shrinkage. The approach can be used in the design of members to quantifying the number and spacing of fasteners resulting in strengths exceeding conventional EB systems, and thus can be used to develop design guidelines.
机译：加固RC梁的常用方法是通过外部粘结（EB）或通过机械紧固件（MF）的快速连接，将纤维增强聚合物（FRP）条连接到梁的拱腹。用MF-FRP条模拟RC梁是复杂的，因为需要进行全成员分析来确定紧固件之间FRP条中产生的应变。而且，由于在混凝土和带材之间不存在直接相互作用，因此应变相容性不适用，因此常规的完全相互作用（FI）方法依赖于经验得出的构件行为。本文介绍了一种成员分析，其中使用分段M /θ方法确定具有预应力和非预应力MF-FRP条形梁的梁变形和力。作为基于力学的方法，该方法结合了残余应变局部相互作用（PI）理论来直接模拟拉伸刚度的影响，并结合尺寸依赖的应力应变模型来模拟与混凝土软化相关的混凝土楔形物。此外，PI理论直接考虑了混凝土蠕变和收缩的影响。该方法可用于构件的设计中，以量化紧固件的数量和间距，从而获得超过常规EB系统的强度，因此可用于制定设计准则。

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  • 来源
    《Composite Structures》 |2014年第8期|99-106|共8页
  • 作者

    Daniel Knight; Phillip Visintin; Deric J. Oehlers; M.S. Mohamed Ali;

  • 作者单位

    School of Civil, Environmental and Mining Engineering, The University of Adelaide, South Australia 5005, Australia;

    School of Civil, Environmental and Mining Engineering, The University of Adelaide, South Australia 5005, Australia;

    School of Civil, Environmental and Mining Engineering, The University of Adelaide, South Australia 5005, Australia;

    School of Civil, Environmental and Mining Engineering, The University of Adelaide, South Australia 5005, Australia;

  • 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

    Mechanically fastened; FRP; Numerical analysis; Partial-interaction; Prestress; Reinforced concrete;

    机译：机械固定;玻璃钢;数值分析;部分互动;预应力;钢筋混凝土;

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