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It has been more than twenty years since the application of GFRP bridge decks in construction fields. Recently, a few studies by governments and individual researchers have investigated in-use GFRP bridge decks. Areas of trouble include the problems of cracking, spalling and the de-bonding of the pavement or the wearing surface on GFRP bridge decks, all of which affect the long-term durability and serviceability of these new construction materials. Related to these problems, reflective cracks on asphalt pavement are directly related to pultruded GFRP bridge decks. This study investigates the behavior of an adhesive joint under weak-axis bending by tests and FE analyses to identify the causes of pavement cracks in in-use pultruded GFRP bridge decks. In detail, the flexural stiffness and the load-carrying capacities in strong and weak axes are measured during bending tests on pultruded GFRP decks. Next, tensile local failures of an epoxy adhesive due to the concentration of deformations at adhesive joints are identified via a weak-axis bending test. Finally, the tensile failure of an epoxy adhesive due to the local concentration of deformation at an adhesive joint under weak-axis bending is verified through a finite element analysis.
1. 서 론
2. 인발성형 GFRP 교량 바닥판
3. 약축 휨 시험
3.1 시험개요
2.2 접착연결부 단부 에폭시의 균열거동
2.3 휨강성과 휨내하력 비교
3. 유한요소해석
3.1 해석모델
3.2 해석모델에 따른 약축 휨강성 비교
3.3 약축 휨하중에 의한 표면 변형률 분포
3.4 접착연결부 단부의 응력검토
References
