Bearing capacity computation for a ring foundation using the stress characteristics method

Keshavarz, Amin; Kumar, Jyant

doi:10.1016/j.compgeo.2017.04.006

Cited by 58 publications

(19 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Boushehrian and Hataf [6] conducted an experimental study on the bearing capacity of circular and ring footings resting on reinforced sand. Keshavarz and Kumar [7] performed a study on a ring footing using the stress characteristics method, concluding that the bearing capacity reached a maximum level when n = Di/D is 0.1-0.5 (n is the ratio between the internal and outer diameter of the ring), which appears to be rather relaxing. Budania et al [8] observed that the optimum depth of the first layer of geogrid was 0.5 B (B is the width of the rectangular footing).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Bearing Capacity of a Ring Footing on Geogrid Reinforced Sand

2021

View full text Add to dashboard Cite

A ring footing is found to be of practical importance in supporting symmetrical constructions for example silos, oil storage container etc. In the present paper, numerical analysis was carried out with explicit code FLAC3D 7.0 to investigate bearing capacity of a ring footing on geogrid reinforced sand. Effects of the ratio n of its inner/ outer diameter (Di / D) of a ring footing, an optimum depth to lay the geogrid layer were examined. It was found that an intersection zone was developed in soil under inner-side (aisle) of ring footing, contributing to its bearing capacity. Substantial increase of bearing capacities could be realized if ratio n of a ring footing was around 0.6. Numerical results also showed that, bearing capacity of a ring footing could increase significantly if a single-layer geogrid was laid at a proper depth under the footing. Similar contribution was found if a double-layer geogrid was implemented. However, such increases appeared to be rather limited if a triple-layer geogrid or a four-layer geogrid was used. A double-layer geogrid was recommended to increase the bearing capacity of a ring footing; the depth to lay this double-layer geogrid was also discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Bearing Capacity of a Ring Footing on Geogrid Reinforced Sand

2021

View full text Add to dashboard Cite

show abstract

“…[3] and more recently Razavi and Hataf [4] have also studied the behaviour of hollow circular footings and its parameters. Gholami and Hosseininia [5] and Keshavarz and Kumar [6] derived the three bearing pressure factors (Nc, Nq, Ny) for ring footings. Masoud Makarchian and Ehsan Badakhshan [7], in their paper stated that for the unreinforced condition, the square and circular footings having the same area almost have equal ultimate bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Load Settlement Behaviour of Ring Footings for Different Internal Diameter Keeping the Contact Surface Area Same

Rupani¹,

Bhoi²

2019

World Congress on Civil, Structural, and Environmental Engineering

View full text Add to dashboard Cite

In some practical cases during the design of a foundation, ring configuration can be more preferred in comparison to the solid circular footing due to some field or topographical constraints. To address such issues and to reach a viable solution an experimental program was undertaken. This paper depicts the experiments conducted to study the load-settlement behaviour of ring footings on granular soil; under axial loading condition through Plate Load Test. The chosen ring footing was the special cases of the solid circular footing (Diameter 150mm); both having same contact area. The ring diameters chosen to achieve the same surface area are (in terms of Dinner-Douter) 60-160mm, 100-180mm, 200-250mm. The ring Diameter ratio for each are n=0.375, 0.555, and 0.8 respectively. The Objective was to analyze the effect of increasing ring diameter ratio on the load-settlement behaviour while keeping the contact surface area same. The results show that bearing capacity of footing starts decreasing reasonably up to n=0.375 and afterward there is a steep decrease for n=0.555 and n=0.8.

show abstract

“…Kumar and Chakraborty [5] used finite element analysis along with upper and lower bound theories to determine the bearing capacity factors. Recently, Gholami and Hosseininia [6] and Keshavarz [7] and Kumar [5] derived all three bearing capacity factors for rigid hollow circular footings using stress characteristics method. Numerical analysis through FLAC was performed by Zhao and Wang [8], Benmebarak et al [9] and Hosseininia [6] to obtain the bearing capacity factors of solid ring footings for a range of soil friction angles.…”

Section: Introductionmentioning

confidence: 99%

“…These analyses were performed under axi-symmetric condition instead of three-dimensional analysis due to the geometry of the solid ring footings. In the domain of experimental studies, the behaviours of rigid hollow circular footings resting on granular soils were studied by small-scale laboratory or field tests [5][6][7][8][9]. Based on the experiments, it has been shown that the bearing capacity of the hollow circular footing is a function of the ring diameter ratio i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the experiments, it has been shown that the bearing capacity of the hollow circular footing is a function of the ring diameter ratio i.e. ratio of inner diameter to the outer diameter, such that the bearing capacity increases up to the ring diameter ratio of 0.3-0.4, afterwards it decreases as the diameter ratio increases [5][6][7][8][9]. All the above mentioned works gives the data about the bearing capacity of ring footings under vertical loading condition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of Bearing Capacity and Settlement Behaviour of Solid Circular and Hollow Circular Footings on Granular Soil

Patel¹,

Bhoi²

2019

World Congress on Civil, Structural, and Environmental Engineering

View full text Add to dashboard Cite

This paper presents the experimental study of bearing capacity of isolated model footings which are hollow circular and solid circular in shape subjected to axial loading. The ring footing shape is characterized by outer diameter Do and the inner diameter Di, defined by ring diameter ratio, n= (Di/Do). In this study, behaviour of one solid circular footing (n=0) and four ring footings with n=0.166 (Di=2.5cm), n=0.333 (Di=5cm), n=0.666 (Di=10cm) and 0.866 (Di=13cm) were investigated to analyze the effect of increasing inner diameter while keeping outer diameter constant (Do=15cm). A relationship between load intensity, footing pressure, ring diameter ratio and settlement is developed for each type of footing to determine the influence of the above-mentioned parameters on the bearing capacity and settlement of the footing. These relationships depict that the bearing capacity varies with the change in ring diameter ratio. An efficiency factor is derived from the stress-settlement relation for different ring diameter ratio. It is found that for the hollow circular footings having n=0.166 and n=0.333, the failure pattern is comparable to the solid circular footing having identical bearing capacity and the load-settlement curve, this may be due to the more confining effect up to certain ring diameter ratio; suggesting the use of hollow circular footings over solid footings thereby making savings in volume of material used and the cost incurred.

show abstract

Bearing capacity computation for a ring foundation using the stress characteristics method

Cited by 58 publications

References 11 publications

Numerical Analysis of Bearing Capacity of a Ring Footing on Geogrid Reinforced Sand

Numerical Analysis of Bearing Capacity of a Ring Footing on Geogrid Reinforced Sand

Experimental Study of Load Settlement Behaviour of Ring Footings for Different Internal Diameter Keeping the Contact Surface Area Same

Study of Bearing Capacity and Settlement Behaviour of Solid Circular and Hollow Circular Footings on Granular Soil

Contact Info

Product

Resources

About