RECENT DEVELOPMENTS IN FRP-BASED HYBRID STRUCTURES
Fiber-reinforced polymer (FRP) composites are formed by embedding continuous fibers in a polymeric resin matrix which binds the fibers together. These materials possess excellent corrosion resistance and a high strength-to-weight ratio; in addition, their properties in different directions can be tailored to achieve the best structural performance. These materials also have a number of disadvantages including a low modulus-to-strength ratio, linear-elastic-brittle stress-strain behavior, poor performance in fire, and a relatively high material cost. Over the past twenty years, FRP composites have gradually become accepted as a new generation of construction material. In particular, external bonding of FRP composites has become a popular technique for the strengthening of structures. In strengthening applications, the advantages of FRP composites are fully exploited; their disadvantages such as poor fire resistance impose some limitations on applications, but are outweighed by their advantages. FRP composites also hold great potential for the construction of sustainable new structures. Here, some of the disadvantages of FRP composites, particularly their brittle behavior and poor fire resistance, become greater obstacles to overcome. For FRP composites to become widely used in new structures, it is very often necessary to combine FRP with traditional materials, instead of using FRP alone; it is also often imperative to create new structural forms that can make the best use of the advantages of FRP composites. Against this background, new forms of hybrid structures incorporating FRP composites have been explored by researchers around the world and a number of these forms have shown great promise. This paper provides a review of recent developments in such FRP-based hybrid structures where FRP is used in combination with concrete or in combination with both concrete and steel. For each form, the structural rationale is explained and its advantages as well as limitations are examined. In particular, a detailed discussion is provided of FRP-concrete-steel double-skin tubular members developed by the authors group. The paper concludes with some general observations on the development and practical application of FRP-based hybrid structures.
Jin-Guang Teng
Department of Civil and Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China
国际会议
厦门
英文
178
2011-10-28（万方平台首次上网日期，不代表论文的发表时间）