Investigating the Practical Conditions to Utilize Brick Stair Wall Method as a Supporting Structure in Urban Excavation

Beizaei, Mahsa; Hosseininia, Ehsan Seyedi; Morovatdar, Ali

doi:10.1061/9780784482797.042

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…Therefore, improving the ductility of concrete is very important, especially due to the fact that concrete structures may experience extreme loadings during their lifetime [11][12][13][14]. To address such a deficiency, a continuous reinforcing bar has been applied to resist the tensile force imposed on the structure [15][16][17][18]. Unlike continuous reinforcing bars, fibers are short, discontinuous, and randomly distributed throughout the concrete to produce a more ductile and crack control matrix.…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Gebretsadik

Jadidi

Farhangi

et al. 2021

Eng. Technol. Appl. Sci. Res.

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This study investigates the feasibility of the application of ultrasonic measurement to characterize Steel-Fiber-Reinforced Concrete (SFRC). Specifically, the effects of steel fiber content, age, moisture content, and fiber orientation on Ultrasonic-Pulse-Velocity (UPV) were investigated. In this regard, beam and cylindrical samples were fabricated with different steel fiber contents. The result indicated that for beam specimens the UPV increases with the addition of fiber up to 2% and decreases for higher fiber percentages. Additionally, the fiber orientation within the beam specimens influences the UPV measurements. For cylindrical samples, the rate of UPV decreased with the addition of steel fiber reinforcement. In addition, it was discovered that the curing period affects the magnitude of UPV.

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Section: Introductionmentioning

confidence: 99%

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Gebretsadik

Jadidi

Farhangi

et al. 2021

Eng. Technol. Appl. Sci. Res.

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“…Fifteen node triangle axisymmetric elements were used in the simulation of the concrete shaft, soil layers, and caliche. The element stiffness matrix was evaluated by numerical integration, using a total of three Gauss stress points [49][50][51][52]. The installed O-cell hydraulic jack in the shaft was simulated as a one-foot empty void.…”

Section: Plaxis Finite Element Analysismentioning

confidence: 99%

Effect of Competent Caliche Layers on Measuring the Capacity of Axially Loaded Drilled Shafts Using the Osterberg Test

2020

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This study investigates the effect of the location of an O-cell hydraulic jack along the length of a drilled shaft in a full-scale Osterberg test performed in soils containing layers of caliche. The location of the hydraulic jack with respect to caliche layers influences the measurements obtained from the Osterberg test and the subsequent interpretation of drilled shaft capacity. In this study, drilled shaft capacities were derived utilizing data from 30 Osterberg full-scale field load tests in soils containing caliche layers. The hydraulic jack was placed at the midpoint of the drilled shaft length. Additionally, the Osterberg test data was used to calibrate a numerical model by Plaxis finite element software for drilled shaft analysis. Using the calibrated model, several scenarios of hydraulic jack location were simulated. The scenarios included hydraulic jack locations at several distances above and below a caliche layer. The results of the simulations indicate that in cases where the O-cell was installed far from the caliche layer, the Osterberg tests results showed lower pile resistance capacity compared to the top-down test. However, in cases where the O-cell was installed close to the caliche layers, the Osterberg tests results showed comparable pile resistance capacity compared to the top-down tests. This study recommends installing the hydraulic jack as close as possible to the caliche layers for more reliable interpretation of the Osterberg field tests which leads to a cost-effective design approach by reducing the required shaft length.

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Tunnel Reinforcement in Soft Grounds Using Umbrella Arch Method

Morovatdar

Palassi

Behnia

2021

Advances in Innovative Geotechnical Engineering

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Investigating the Practical Conditions to Utilize Brick Stair Wall Method as a Supporting Structure in Urban Excavation

Cited by 6 publications

References 12 publications

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Effect of Competent Caliche Layers on Measuring the Capacity of Axially Loaded Drilled Shafts Using the Osterberg Test

Tunnel Reinforcement in Soft Grounds Using Umbrella Arch Method

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