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首页> 外文会议>International Conference on Advances in Building Technology Vol.1, Dec 4-6, 2002, Hong Kong, China >ULTIMATE AXIAL STRAIN OF FRP-CONFINED CONCRETE
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ULTIMATE AXIAL STRAIN OF FRP-CONFINED CONCRETE

机译：FRP约束混凝土的极限轴向应变

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摘要

External confinement by the wrapping of FRP sheets (or FRP jacketing) provides a very effective method for the retrofit of reinforced concrete (RC) columns subject to either static or seismic loads. For the reliable and cost-effective design of FRP jackets, an accurate stress-strain model is required for FRP-conftned concrete. Central to such a model is the determination of the ultimate condition of FRP-confined concrete which is reached when the FRP ruptures. This ultimate condition is characterized by two parameters: the ultimate axial strain and the corresponding stress level which may or may not be the ultimate strength of the FRP-confined concrete (i.e. the axial compressive strength). This paper presents a new equation for the ultimate axial strain of FRP-confined concrete on which there has been much uncertainty and considerable controversy. Both the stiffness and the actual ultimate condition of the FRP jacket are explicitly accounted for in this new equation. The theoretical basis and performance of the equation are discussed in detail. The paper also suggests confined cylinder tests as a standard type of tests to determine the efficiency factor of a particular FRP product in confinement applications, defined as the ratio between the actual hoop rupture strain of FRP in FRP-confined concrete and the ultimate tensile strain from material tests generally conducted using flat coupons.
机译：通过包裹FRP板（或FRP护套）进行的外部约束为钢筋混凝土（RC）柱的静载或地震荷载改造提供了一种非常有效的方法。为了可靠且经济高效地设计FRP护套，需要对FRP掺混混凝土进行精确的应力应变模型。这种模型的核心是确定FRP破裂后达到的FRP约束混凝土的最终条件。该极限条件的特征在于两个参数：极限轴向应变和相应的应力水平，该应力水平可能是也可能不是FRP约束混凝土的极限强度（即轴向抗压强度）。本文提出了一种新的FRP约束混凝土极限轴向应变方程，该方程存在很大的不确定性和很大的争议。在这个新方程式中，FRP护套的刚度和实际极限条件都得到了明确说明。详细讨论了该方程的理论基础和性能。该文件还建议采用密闭圆柱试验作为确定受限条件下特定FRP产品效率系数的标准测试类型，该系数定义为FRP约束混凝土中FRP的实际环向破裂应变与来自FRP的混凝土的极限拉伸应变之比。材料测试通常使用平板试样进行。

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