Modeling of structural performances under coupled environmental and weather actions

Maekawa, Koichi; Ishida, Tetsuya

doi:10.1007/bf02480352

Cited by 45 publications

(30 citation statements)

References 12 publications

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“…Meanwhile, the authors have been developing a multi-scale chemo-hygral computation system (Du-COM-COM3, Maekawa et al 2008;Maekawa and Ishida 2002). Based upon the recent updates to deal with the multi-ionic states of equilibrium Ishida 2013, 2014), a strong coupling model of chemical reactions and mechanics has been made (Takahashi et al 2014(Takahashi et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Takahashi

Tanaka

Maekawa

2018

ACT

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To estimate the remaining life of existing RC bridge decks damaged by alkali silica reaction (ASR), multi-scale numerical analysis with chemo-hygral model is integrated with visual inspection data at site. First, the applicability of the poro-mechanical models for ASR expansion in the multi-scale frame are examined with the experiments of the real scale RC slabs and the model is validated to bring about fair prediction of the 3D anisotropic expansion and the fatigue life of the slabs. Second, visually inspected cracks on bottom surfaces of RC decks are converted to space-averaged strains, and the magnitude of ASR is estimated from the vertical deformation, based on which the internal pre-stress and the damage fields are re-produced by numerical predictor-corrector cycles, and the remaining life of ASR damaged RC bridge decks is fairly estimated. By conducting sensitivity analyses in terms of ASR-gel volumes and cracks, allowable error range of site inspection data is clarified to meet the requirement of asset management.

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Section: Introductionmentioning

confidence: 99%

Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Takahashi

Tanaka

Maekawa

2018

ACT

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“…8. Figure 9 shows the FE discretization and the mix proportion and the material properties were used for input information of the integrated thermodynamics (Maekawa et al 2008, Maekawa andIshida 2002) As the moisture migration is in one-way and wetting/drying is defined on the upper and lower faces of the section, comparatively smaller size of elements is specified and the mean sizes of the elements placed around the core of the section are about twice the average size of coarse aggregates in consideration of moisture migration analysis and local moisture exchange between aggregates and surrounding cement paste phases (Yoneda et al 2014). Here, the cement hydration just after the mixing and associated micro-structure formation was computed in time and space, and the timedependent deformation of cement hydrates were simulated with the moisture states kept in the formed micropores.…”

Section: Coupled Differential Shrinkage-swelling and Sustained Loadsmentioning

confidence: 99%

Mechanism of Long-Term Excessive Deformation and Delayed Shear Failure of Underground RC Box Culverts

Maekawa

Zhu

Chijiwa

et al. 2016

ACT

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The aim of this study is to clarify the mechanism of the progressive excessive deformation observed in real underground RC box culverts of about 30 years of age. It was found by the site-inspection, monitoring and the destructive testing that the excessive deflection of top slabs for the culverts, which is almost 10 times the design estimated value, accompanies the out-of-plane shear failure. It is also computationally investigated that the coupling of subsidence of the backfill soil and the combined creep and shrinkage of concrete after cracking is closely associated with the delayed shear failure found in the culvert in service. In order to prove the delayed shear failure under higher sustained loads, the timedependent shear crack propagation was reproduced in the laboratory test and the computational approach used in this study was examined.

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“…The most common model used by most of the researchers (e.g. mentioned before [6][7][8][9][10][11][12][13][14][15][16][17]) as a basic model that determines the depth of carbonation, x after the time of exposure, t can be expressed in the form:…”

Section: Carbonation Models 41 Traditional Approach To Mathematical mentioning

confidence: 99%

Cost-effective design of reinforced concrete with use of self-terminated carbonation model

Woyciechowski

Sokołowska

2016

MATEC Web Conf.

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Abstract. According to Eurocodes EC0 and EC2 designing of concrete structure durable in terms of carbonation is assured by selection of suitable thickness of reinforcement concrete cover. The selection is done on the basis of structure category and concrete strength class, regardless of the concrete material composition or technological type, thus selected value is an estimation, often exaggerated. The paper presents elaborated "selfterminated carbonation model" that includes abovementioned factors and enables to indicate the maximal possible depth of carbonation. The model, in contrast to parabolic models published in the literature, is a hyperbolic function of carbonation depth in time. The paper explains why such model describes the phenomenon of carbonation better than others. The paper contains an example of calculation of the cover thickness using that model.

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Modeling of structural performances under coupled environmental and weather actions

Cited by 45 publications

References 12 publications

Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Assimilation

Mechanism of Long-Term Excessive Deformation and Delayed Shear Failure of Underground RC Box Culverts

Cost-effective design of reinforced concrete with use of self-terminated carbonation model

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