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首页> 外文会议>First International Conference on Advanced Polymer Composites for Structural Applications in Construction, Apr 15-17, 2002, Southampton University, UK >Effect of curvature on the bond between concrete and CFRP sheets
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Effect of curvature on the bond between concrete and CFRP sheets

机译：曲率对混凝土与CFRP板之间粘结力的影响

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摘要

FRP sheets or laminates are widely utilized for flexural and/or shear strengthening of beams, for confining concrete columns and improving joints performance, mostly in seismic areas. The success of retrofitting techniques depends on more extent on the bond performance between FRP reinforcement and concrete. In fact, under both service and ultimate conditions the interface behaviour plays a fundamental role; cracking and deformations are influenced from bond laws as well as, at the ultimate state, the bond failure can cause an unexpected collapse of the concrete elements. In particular, when curved concrete members are strengthened with FRP sheets, a combination of shear and normal stresses is transferred at the interface. Such combination involves, in many cases, a premature failure of bond. In this paper an experimental investigation, aimed to analyse the bond between FRP sheets and curved concrete elements, is reported. At this aim a bending test (modified RILEM test) has been performed on curved elements reinforced with CFS (Carbon Fiber Sheet). In particular the state of stress and strain at the interface is analyzed varying the curvature of the elements and the stiffness of the reinforcement. Obtained results are discussed and compared with those regarding concrete members without curvature.
机译：FRP薄板或层压板广泛用于梁的抗弯和/或抗剪加固，用于约束混凝土柱并改善接头性能，主要用于地震地区。改造技术的成功在很大程度上取决于FRP增强材料与混凝土之间的粘结性能。实际上，在服务和最终条件下，接口行为都起着根本性的作用。开裂和变形受粘结定律的影响，在极限状态下，粘结破坏会导致混凝土构件的意外塌陷。特别是，当用FRP板加固弯曲的混凝土构件时，剪切应力和法向应力的组合会在界面处传递。在许多情况下，这种结合涉及键的过早失效。在本文中，进行了一项旨在分析FRP板与弯曲混凝土构件之间粘结力的实验研究。为此，已经对用CFS（碳纤维片）增强的弯曲元件进行了弯曲测试（改进的RILEM测试）。尤其是分析了界面处的应力和应变状态，从而改变了元件的曲率和加强件的刚度。对获得的结果进行了讨论，并与无曲率混凝土构件的结果进行了比较。

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