Defects of concrete piles can occur at any point during the construction of piles. Most common ty... more Defects of concrete piles can occur at any point during the construction of piles. Most common types of pile integrity issues are; presence of voids, inconsistency in concrete mix, entrapped groundwater or slurry, and geometric dislocation. These defects can be categorized based on the place in the construction sequence at which the defect occurs. This research introduces several numerical models of defected piles with various scenarios in order to identify, locate, and quantify the necking occurring in these piles. The finite element software (ADINA) is used to simulate the studied models. The soil domain is modeled as an axisymmetric space around the concrete pile. Five diameters of piles (40, 60, 80, 100 and 120 cm) are studied. Necking is modeled at three different locations along the pile namely; upper, middle, and bottom third. Four ratios between the necking diameter and pile diameter are also studied. The dynamic force used in this research is that simulating the pile integr...
The soil of Tina Plain in Sinai is classified as very soft to soft clay. Buildings on this type o... more The soil of Tina Plain in Sinai is classified as very soft to soft clay. Buildings on this type of soil experience excessive settlements. Thus, deep foundations are considered as the most suitable type to support building loads. Another option is to use a light-weight material as a partial replacement under footings to decrease the stress on soil and consequently reduce the expected settlements. Expanded polystyrene (EPS) Geofoam blocks have been used as a light-weight-fill material under lightly loaded footings on soft clay soil to reduce settlements. An experimental study has been performed to assess the behavior of footings resting on soft clay, improved with EPS geofoam partial replacement. The experimental study of this research is divided into two parts; the first part is a laboratory program to investigate the mechanical properties of Geofoam. The second part is a field load testing program on small-scale model isolated footings founded on soft clay partially replaced by Geof...
Folded foundations have been used as an alternative to the conventional flat shallow foundations,... more Folded foundations have been used as an alternative to the conventional flat shallow foundations, in situations involving heavy loads or weak soils. They can be geometrically shaped in many forms especially for continuous footings such as strip footings. The purpose of this study is introducing an alternative foundation shape that reduces the cost of foundations by reducing the amount of reinforcing steel through choosing the most effective folded strip footing shape. The study is performed in two main phases. First, experimental study is performed using eighteen (18) half scale footings of which nine (9) footings are of rectangular shape and nine (9) footings are of folded shape by a folding angle of 20. The experimental setup is composed of steel tank with dimensions of 2.5m length * 2.5m width * 2.10m height. The tank is filled with medium dense sand. A numerical study using the finite element software ADINA is also performed in which the soil underneath the footing is modeled wi...
Static and dynamic behavior of above-ground steel storage oil tanks resting on end bearing piles ... more Static and dynamic behavior of above-ground steel storage oil tanks resting on end bearing piles or stone columns are studied and analyzed using ADINA (2019) program. The studied soil profile is an upper soft clay soil layer, followed by an extended dense sand layer. The main purpose of this research is to explore to what extent stone columns can be used as an effective alternative to concrete piles under steel storage tanks. Therefore, many three-dimensional numerical models are conducted to analyze and study the performance of such tanks in both static and dynamic cases. Ten of the studied cases are steel tanks resting over stone columns with different numbers and properties. On other hand, one model studied the behavior of steel tank resting on large diameter concrete piles. Results indicate that stone columns can be used instead of end bearing piles as long as the computed settlements are safe. In addition, stone columns are behaving better than concrete piles in decreasing of h...
Defects of concrete piles can occur at any point during the construction of piles. Most common ty... more Defects of concrete piles can occur at any point during the construction of piles. Most common types of pile integrity issues are; presence of voids, inconsistency in concrete mix, entrapped groundwater or slurry, and geometric dislocation. These defects can be categorized based on the place in the construction sequence at which the defect occurs. This research introduces several numerical models of defected piles with various scenarios in order to identify, locate, and quantify the necking occurring in these piles. The finite element software (ADINA) is used to simulate the studied models. The soil domain is modeled as an axisymmetric space around the concrete pile. Five diameters of piles (40, 60, 80, 100 and 120 cm) are studied. Necking is modeled at three different locations along the pile namely; upper, middle, and bottom third. Four ratios between the necking diameter and pile diameter are also studied. The dynamic force used in this research is that simulating the pile integr...
The soil of Tina Plain in Sinai is classified as very soft to soft clay. Buildings on this type o... more The soil of Tina Plain in Sinai is classified as very soft to soft clay. Buildings on this type of soil experience excessive settlements. Thus, deep foundations are considered as the most suitable type to support building loads. Another option is to use a light-weight material as a partial replacement under footings to decrease the stress on soil and consequently reduce the expected settlements. Expanded polystyrene (EPS) Geofoam blocks have been used as a light-weight-fill material under lightly loaded footings on soft clay soil to reduce settlements. An experimental study has been performed to assess the behavior of footings resting on soft clay, improved with EPS geofoam partial replacement. The experimental study of this research is divided into two parts; the first part is a laboratory program to investigate the mechanical properties of Geofoam. The second part is a field load testing program on small-scale model isolated footings founded on soft clay partially replaced by Geof...
Folded foundations have been used as an alternative to the conventional flat shallow foundations,... more Folded foundations have been used as an alternative to the conventional flat shallow foundations, in situations involving heavy loads or weak soils. They can be geometrically shaped in many forms especially for continuous footings such as strip footings. The purpose of this study is introducing an alternative foundation shape that reduces the cost of foundations by reducing the amount of reinforcing steel through choosing the most effective folded strip footing shape. The study is performed in two main phases. First, experimental study is performed using eighteen (18) half scale footings of which nine (9) footings are of rectangular shape and nine (9) footings are of folded shape by a folding angle of 20. The experimental setup is composed of steel tank with dimensions of 2.5m length * 2.5m width * 2.10m height. The tank is filled with medium dense sand. A numerical study using the finite element software ADINA is also performed in which the soil underneath the footing is modeled wi...
Static and dynamic behavior of above-ground steel storage oil tanks resting on end bearing piles ... more Static and dynamic behavior of above-ground steel storage oil tanks resting on end bearing piles or stone columns are studied and analyzed using ADINA (2019) program. The studied soil profile is an upper soft clay soil layer, followed by an extended dense sand layer. The main purpose of this research is to explore to what extent stone columns can be used as an effective alternative to concrete piles under steel storage tanks. Therefore, many three-dimensional numerical models are conducted to analyze and study the performance of such tanks in both static and dynamic cases. Ten of the studied cases are steel tanks resting over stone columns with different numbers and properties. On other hand, one model studied the behavior of steel tank resting on large diameter concrete piles. Results indicate that stone columns can be used instead of end bearing piles as long as the computed settlements are safe. In addition, stone columns are behaving better than concrete piles in decreasing of h...
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