Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

Okhovat, Mohammad Reza; Feng, Shi‐Jin; Maekawa, Koichi

doi:10.3151/jact.7.439

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…The ASR-induced expansion model used in this study is formulated based on multi-scale poro-mechanics by Takahashi et al (2014Takahashi et al ( , 2015b, which has been also used widely in geotechnical engineering applications such as the consolidation and liquefaction of soil foundations (Biot 1963;Okhovat et al 2009). In the field of structural concrete mechanics, the multi-scale mechanics has been applied to fatigue life assessment of reinforced concrete members with stagnant water (Maekawa et al 2015).…”

Section: Appendixmentioning

confidence: 99%

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Takahashi

Ogawa

Tanaka

et al. 2016

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This study set out to investigate the effect of gel migration through micro-pores and cracks on concrete expansion caused by alkali-silica reaction (ASR). First, sensitivity analyses with permeation of produced silica gel were conducted by using a computational scheme of multi-scale poro-mechanics. Then, silica gel movements were found to substantially affect the ASR expansion of concrete with the possibility of its scale effect being rooted in the drugging force when the silica gel is in motion. With accelerated ASR tests of mortar, the predicted scale effects were experimentally verified and the permeation of gel was inversely identified in terms of multi-scale mechanics. Here, the effect of alkali ion leaching on the scale-dependency was also discussed in view of chemo-physics as well as mechanics of produced gel migration. The measured characteristic scale-dependency in the experiment can be also simulated by nonlinear analysis of smeared cracks coupled with gel generation, migration and alkali ion leaching.

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Section: Appendixmentioning

confidence: 99%

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Takahashi

Ogawa

Tanaka

et al. 2016

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“…The yield strength of each fictitious component denoted by F m varies with the updated magnitude of confinement in accordance with Mohr-Coulomb's frictional rule [31]. The volumetric confinement may fluctuate and affect the local shear strength of soil skeleton in foundation analysis.…”

Section: Constitutive Modelsmentioning

confidence: 99%

“…So, the joint interfaces modeling have minor roles on the structural damage analysis. This joint interface model was previously applied to the drained and undrained states of liquefiable soil [31].…”

Section: Constitutive Modelsmentioning

confidence: 99%

Seismic interaction of underground RC ducts and neighboring bridge piers in liquefiable soil foundation

2015

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A coupled system of an underground reinforced concrete (RC) duct and a neighboring bridge pier supported by group piles is numerically investigated in sandy soil at both drained and undrained liquefiable states under seismic ground excitations. Parametric studies are conducted to evaluate influencing factors on seismic performances of these neighboring interactive structural systems. The numerical simulations are performed with the finite element code COM3 (COncrete Model for 3D) (Maekawa, Pimanmas and Okamura in Nonlinear mechanics of reinforced concrete, 2003), which is capable of simulation of inelastic performance of RC structure and high nonlinearity of soil medium, especially on the liquefiable loose sand. It is mechanically pointed out that liquefaction-induced uplift of underground ducts is substantially influenced by the presence of on-ground bridges. Alternatively, inertial forces induced to the onground bridge pier are also noticeably affected by the presence of the neighboring underground RC duct. It is pointed in practice of design that these nonlinear interacting responses between these neighboring infrastructures are greatly magnified on liquefiable soil foundations.

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“…If it is less than unity, shear failure may take place before yielding of main reinforcement and a brittle collapse against the axial forces will be initiated (Okhovat et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…According to experiments on sandy soils, the following formulae are adopted, (Okhovat, et al 2009). (Okhovat, et al 2009 …”

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confidence: 99%

Global and Local Impacts of Soil Confinement on RC Pile Nonlinearity

Mohammed

Maekawa

2012

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Greater confinement of the soil foundation may globally reduce the shear span length, which may raise the risk of shear failure of RC piles. On the other hand, soil confinement may improve the flexural ductility of the pile section locally. This study discusses these global and local impacts of soil confinement on the RC-pile mechanistic behaviors, experimentally and analytically. Small-scale mortar-based piles were newly produced as a mockup of real-scale reinforced concrete so as to obtain the consistent nominal shear strength by reducing the shear transfer along cracks to overcome the size effect. Then, the global impact of soil confinement on pile shear failure is reproduced inside the small-scale experimental devices with soil. The soil-pile interaction test also shows the local impact of soil confinement in terms of increasing the flexural ductility of the miniature pile section by suppressing cover spalling and local buckling of reinforcement. It is confirmed that the coupled local and global effects of soil confinement can be consistently taken into account in 3D computational simulation without reducing the degree of freedom for strain fields.

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Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

Cited by 10 publications

References 19 publications

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Scale-Dependent ASR Expansion of Concrete and Its Prediction coupled with Silica Gel Generation and Migration

Seismic interaction of underground RC ducts and neighboring bridge piers in liquefiable soil foundation

Global and Local Impacts of Soil Confinement on RC Pile Nonlinearity

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