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

Maekawa, Koichi; Zhu, Xiaoxin; Chijiwa, Nobuhiro; Tanabe, S.

doi:10.3151/jact.14.183

Cited by 25 publications

(16 citation statements)

References 25 publications

(32 reference statements)

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“…Although the long-term deformation and the creep capacity of RC were reported (Chijiwa et al 2015;Maekawa et al 2016) for comparatively smaller depth of RC members, large-scale RC is under way in practice. Underground LNG storage tanks, whose base slabs can be of the order of 4~10 m depth and is under sustained uplift underground water pressure from foundation, is such an example.…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Capacity of Large Scale Deep Beams under Sus-tained Loads

Bugalia

Maekawa

2017

ACT

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The aim of this study is to investigate the effect of sustained loads on the capacity of large-scale deep beams as a part of underground reinforced concrete, and to conduct parametric studies by numerical methods. The reduced shear capacity under long-term sustained loads is investigated to be associated with the mode of failure, and the higher timedependency is numerically suggested for deep-beams irrespective of their gain in the short-term static capacity. The main source of the possible decay of shear capacity is analyzed to originate from the creep damage of diagonal compression strut over the web concrete, and a simple expression of the strut-tie analogy is extended to the creep shear rupture of deep beams. Finally, it is concluded that the design safety factor of 1.2~1.3 for shear is appropriate for avoiding the risk of creep failure against long-term sustained loads of about 100 years.

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Section: Introductionmentioning

confidence: 99%

Time-Dependent Capacity of Large Scale Deep Beams under Sus-tained Loads

Bugalia

Maekawa

2017

ACT

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“…On the contrary, the existence of pre-cracks at the corners may initiate the harmful diagonal shear cracks. In fact, the previous research reported that the reason of the excessive deflection of the culvert's top slabs was the occurrence of out-of-plane diagonal shear cracks at the corners [36]. Anyhow, bending actions hardly create cracks at the corners of the slabs.…”

Section: Structural Mechanistic Expressions Of Ann's Weightsmentioning

confidence: 99%

Quantitative Deterioration Assessment of Road Bridge Decks Based on Site Inspected Cracks

et al. 2018

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By integrating a multi-scale simulation with the pseudo-cracking method, the remaining fatigue life of in-service reinforced concrete (RC) bridge decks can be estimated based upon their site-inspected crack patterns. But, it still takes time for computation. In order to achieve a quick deterioration-magnitude assessment of RC decks based upon their crack patterns, two evaluation methods are proposed. A predictive correlation between the remaining fatigue life and the cracks density (both cracks length and width) is presented as a fast judgment. For fair-detailed judgment, an artificial neural network (ANN) model is also introduced which is the basis of the machine learning. Both assessment methods are built commonly by thousands of artificial random crack patterns to cover all possible ranges since the variety of the real crack patterns on site is more or less limited. The built ANN performances are examined by k-fold cross-validation besides checking the prediction accuracy of real crack patterns of bridge RC decks. Finally, the hazard map of the deck’s bottom surface is introduced to indicate the location of higher risk cracking, which derives from the estimated weight of individual neuron in the built artificial neural network.

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“…The would imply that if this critical crack could be identified early (i.e. [27,28]), this could be of practical significance as a means of avoiding undesirable brittle shear failure through direct interventions (i.e. retrofit).…”

Section: Response Under Step-wise Moving Loadmentioning

confidence: 99%

Investigating the Mechanism of Shear Fatigue in Reinforced Concrete Beams subjected to Pulsating and Moving Loads using Digital Image Correlation

et al. 2019

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An experimental investigation on three shear-critical reinforced concrete beams was performed to investigate the mechanism of shear fatigue. The first beam was simply tested to failure under monotonic loading to determine the static capacity, whereas the other two were subjected to repetitive loading below its static capacity to failure. Of these two beams, one was subjected to a stationary pulsating load at midspan while the other was subjected to a step-wise moving load along the span. During each experiment, the crack pattern was monitored throughout using an automated crack mapping employing the digital image correlation technique. The results show that each beam exhibited a unique crack pattern which could be characterised as shear-flexure in nature. It is shown the nature of crack propagation under monotonic loading is dissimilar to that under repetitive loading, especially when the load is not stationary. Moving load is also shown to cause greater damage to the beam than the stationary pulsating load and result in a reduction in fatigue life by almost two orders of magnitude.

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

Cited by 25 publications

References 25 publications

Time-Dependent Capacity of Large Scale Deep Beams under Sus-tained Loads

Time-Dependent Capacity of Large Scale Deep Beams under Sus-tained Loads

Quantitative Deterioration Assessment of Road Bridge Decks Based on Site Inspected Cracks

Investigating the Mechanism of Shear Fatigue in Reinforced Concrete Beams subjected to Pulsating and Moving Loads using Digital Image Correlation

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