氏名

リム ソーポーケム

リム ソーポーケム

職名

講師(任期付)

所属

(創造理工学部)

学歴・学位

学位

博士

外部研究資金

科学研究費採択状況

研究種別:

Long-term structural performance assessment of corroded reinforced concrete structures using an integrated approach of probabilistic and finite element method

2019年-0月-2022年-0月

配分額:¥3770000

学内研究制度

特定課題研究

Effects of fiber distribution and orientation on the flexural performance of steel fiber reinforced normal and self-compacting concrete beams

2018年度共同研究者:Ramiz Ahmed Raju, Sopokhem Lim, Takumi Kageyama, Mitsuyoshi Akiyama

研究成果概要:This experimental research presents an effort toimprove the structural performance of fiber reinforced concrete mem...This experimental research presents an effort toimprove the structural performance of fiber reinforced concrete members byutilizing the high-flowability and self-placability properties of self-compactingconcrete to achieve better distribution and orientation of fibers. In the experiment, self-compactingfiber reinforced concrete (SCFRC) was flown into beam molds while steel fiberreinforced concrete (SFRC) with normal concrete was cast into other same-size beammolds. X-ray images were taken over the length of each beam to investigateeffects of flow and normal casting method on the distribution and orientationof fibers. The bending tests were performed to study the flexural performanceof SCFRC and SFRC beams. It wasconfirmed the distribution and orientation of fibers in SCFRCbeams were better than those in SFRC ones since most fibers werealigned to the high flow. As a result, the flexural performance of SCFRCbeams was superior to those of SFRC ones. However, it is challenging to attaina uniform distribution of fibers over the entire beam length. Furtherresearch is needed to find an optimum combination of concrete flow, fiberamount, and casting method by which a uniform distribution of fibers can beachieved over the entire beam length.

22020構造工学および地震工学関連

2018年度共同研究者:Mingyang Zhang, Mitsuyoshi Akiyama, Dan M. Frangopol

研究成果概要:This research aims to study effects of currentdensity on the spatial steel corrosion and to assess the residualload...This research aims to study effects of currentdensity on the spatial steel corrosion and to assess the residualloading capacity of corroded RC beams using finite element (FE) analysis. TwoRC beams were corroded using current density levels of 50 and 500 μA/cm2.The spatial growth in steel weight loss in RC specimens was quantified atdifferent corrosion levels using X-ray and image processing techniques. Theexperimental result shows that low current density (50 μA/cm2) induced more non-uniformsteel corrosion than the high current density (500 μA/cm2). Gumbel distributionparameters were derived from the experimental results to approximately modelthe spatial variability of steel weight loss which is used as the input into FEmodel of corroded RC beams. The FEanalysis result of the RC beam that has rebar samples generated by the Gumbel distributionparameters associated with lower current density provides a more scattering andlower yielding load capacity, compared with that from a specimen with higher currentdensity.

Effects of casting methods and flow-properties of self-compacting concrete on tflexural behavior of fiber reinforced concrete beams using X-ray images

2019年度共同研究者:Ramiz Ahmed Raju, Takumi Kageyama, Syunsuke Amano, Mitsuyoshi Akiyama

研究成果概要:The effect of concrete casting methods and concretemixes having different fiber contents (i.e., 20 kg/m3 and 40 kg/...The effect of concrete casting methods and concretemixes having different fiber contents (i.e., 20 kg/m3 and 40 kg/m3)on the fiber distribution and orientation as well as the structural performanceof self-compacting concrete fiber reinforced concrete (SCFRC) beams were experimentally investigated. In the experimental program, twocasting methods were designed for pouring the concrete into the same beam molds:case 1, concrete cast from a large 35-degree-slope chute into the entire mold atonce, and case 2, concrete cast from a long pipe. It was found that, with thesame casting method, SCFRC beams with fibercontent of 40 kg/m3 showed lower segregation of fibers but fibersare less aligned to the concrete flow than other beams with fiber content of 20 kg/m3.On the other hand, the casting method of case 1 inducedthe larger velocity of concrete flow than that of case 2. Fibers distribute andorientate better in direction of tensile stress in beams in case 1 due to the larger flowvelocity than that in case 2. Therefore, the structural performance of SCFRCbeam with casting method of case 1 is found to be moderately better than thatof case 2.

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