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Glass fiber reinforced plastic (GRP) pipes buried underground are attractive for use in harsh environments, such as for the collection and transmission of liquids which are abrasive and/or corrosive. In this paper, we present the result of investigation pertaining to the structural behavior of GRP flexible pipes buried underground. In the investigation of structural behavior such as a ring deflection, experimental and analytical studies are conducted. In addition, vertical ring deflection is measured by the field test and finite element analysis (FEA) is also conducted to simulate behavior of GRP pipe buried underground. Based on the results from the finite element analyses considering soil-pipe interaction the vertical ring deflection behavior of buried GRP pipe is predicted. In addition, analytical and experimental results are compared and discussed.
For the design of curved composite T-girder bridges, the torsion analysis is essential. In general. the concrete slab of this type of bridges is connected with the upper flange of steel plate girder by the shear connectors and they behave as a unit against external loads. In the torsion analysis of the composite T-girder bridges the concrete slab is usually assumed as a thin-walled member. But the area of concrete slab section is much larger than the cross sectional area of the flange. Therefore, analytical and experimental investigations on the torsional behavior of the cross section is an important field of further research. In this paper, the analytical torsion analysis is presented, and in the analysis the concrete slab is assumed as a solid member, and the corner effect of membrane of the cross section is taken into account for the formulation of torsion constant. By the application of four different methods the torsion constants, twisting angles, and normal stresses at the bottom flange tip due to torsional moment are evaluated and the graphical form of results for the illustrated structure for comparrison is also presented. The twisting angle and normal stress at the flange tip of composite T-girder section which is assumed as a solid member are always larger than the results obtained by other methods. But the differences are not significant(less than 7%) when the slab to flange width and slab to flange thickness ratios are larger than ten.
Pile foundations constructed by the fiber reinforced polymer plastic piles have been used in coastal and oceanic regions in many countries. Generally, fiber reinforced polymer plastic piles are consisted of filament winding FRP which is used to wrap the outside of concrete pile to increase the axial load carrying capacity or pultruded FRP which is located in the core concrete to resist the bending moment arising due to eccentric loading. In this paper, the analytical procedures of hybrid concrete filled FRP tube flexural members are suggested based on the CFT design method. Moreover, the analytical results are compared with the experimental results to obtained by the previous researches. The results of comparison analyses are performed to estimate the accuracy of the analytical procedure for hybrid FRP-concrete composite compression test, members under eccentrical loading.
Presented in this paper are the results of an analytical investigation pertaining to the elastic buckling behavior of transversely isotropic plate with variable width subjected to unequal uniaxial compression forces at the ends and in-plane shear forces at the sides. The existing analytical solution developed for the isotropic plates is extended so that the transversely isotropic material properties can be taken into account in the plate buckling analyses. For the derivation of buckling equation the power series solution is employed. Graphical forms of results for finding the buckling strength of tapered plates are presented. In addition, the finite element analysis is also conducted. The results are compared and discussed. 본 연구는 폭이 변하는 transversely isotropic 판에서 평행한 변에 서로 크기가 다른 면내 축방향 압축력이 작용하며, 경사진면에는 면내 전단력이 작용하는 경우 판의 탄성좌굴거동에 관한 해석적 연구결과이다. 폭이 변하는 등방성판의 좌굴해석을 위해 개발된 기존의 이론적 해를 확장하여 transversely isotropic 재료의 역학적 성질을 고려한 좌굴해석을 할 수 있도록 하였다. 이론식은 power series를 사용하여 유도하였으며, 유한요소해석을 부가적으로 수행하고 그 결과를 이론식을 사용한 해석결과와 비교, 검토하였다.
In this study, FRP wrapping effect for the seismic performance enhancement of RC bridge pier having lap-spliced region is experimentally evaluated. Reinforcement by FRP wrapping is conducted by hand or wrapping machine. In construction procedure, the RC pier is wrapped by the glass fiber impregnated by epoxy resin. To confirm the seismic performance enhancement of FRP wrapped pier, the quasi-static test is conducted. As a result of test, the displacement ductility and energy dissipation capacity of the FRP wrapped RC pier specimen are increased so the enhancement effect of FRP wrapping is confirmed. In addition, because of the relationship between the amount of FRP reinforcement and seismic capacity is not directly proportional, the optimum amount of FRP reinforcement design may be needed for enhancement of pier with lap-spliced region. 이 연구는 지진하중 작용시 RC 교각의 겹침이음부에서 발생할 수 있는 종방향 철근의 부착파괴를 방지하기 위한FRP 래핑 보강공법에 관한 실험적 연구이다. FRP 래핑공법은 수작업 또는 장비를 이용해 교각에 유리섬유를 래핑하고 에폭시수지를 이용해 고정시키는 공법이다. FRP 래핑공법의 내진성능 보강효과를 확인하기 위해, 겹침이음부가 존재하는 6개의 교각실험체에 대해 준정적실험을 수행하였다. 실험결과 FRP 래핑공법으로 보강한 교각은 변위연성도 및 에너지소산 능력이 증가하였으며, 무보강 실험체에 비해 연성거동함을 확인하였다. 또한, FRP 래핑 보강량과 보강효과는 선형비례하지 않으므로 최적 설계를 통해 교각을 보강하는 것이 효과적임을 확인하였다.