Numerical Analysis of Existing Foundations Underpinned by Micropiles

Kamash, Walid El; Han, Jie

doi:10.1061/(asce)gm.1943-5622.0000833

Cited by 27 publications

(10 citation statements)

References 6 publications

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“…However, it is observed that the effect of micropiles reinforcement on IL is low compared to that of micropile inclination angle. This finding is similar to that presented by El Kamash and Han (2017) who stated that the performance of floating micropiles under vertical loads seemed to be little affected by the micropile elastic modulus.…”

Section: Percentage Of Increase In Lateral Load Capacitysupporting

confidence: 91%

The effect of combined loading on the behavior of micropiled rafts installed with inclined condition

Elsawwaf

Nazir

Azzam

2022

Environ Sci Pollut Res

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One of the major disadvantages of micropiles is their low lateral stiffness and flexural rigidity due to the small diameter. This limitation can be handled in current practice, by installing the micropile with inclined condition or providing a steel casing. Additional steel casings will increase the lateral load capacity of micropiles but increase the project cost as well. Thus, inclination of micropile which is relatively simple and cheap is recommended. In this paper, a comprehensive numerical analysis is conducted on the behavior of micropiled rafts installed with inclined condition under combined vertical and lateral loading. A FEM calibrated against full-scale axial and lateral field tests is used to conduct the analysis. The soil profile is soft clay soil underlain by a layer of dense sand. The study investigates the impact of several parameters which are as follows: magnitude of vertical loading, reinforcement type, inclination angle of micropiles, and number of inclined micropiles. The study reveals that increasing vertical loads causes continuous decrease in the lateral load capacity of micropiled rafts. When all micropiles installed are inclined, the positively inclined micropiles carry 79–86% of the total lateral load carried by micropiles, whereas the negatively inclined ones carry 14–21%. Inclined micropiles offer greater lateral load sharing ratio (αh) than that of vertical ones, largest at θ = 45°. The effect of micropile reinforcement on improving the lateral performance is low compared to the effect of micropile inclination angle.

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Section: Percentage Of Increase In Lateral Load Capacitysupporting

confidence: 91%

The effect of combined loading on the behavior of micropiled rafts installed with inclined condition

Elsawwaf

Nazir

Azzam

2022

Environ Sci Pollut Res

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“…The finite element method was applied in some studies on mico-steel tubular pile of concrete filled steel tubular.Some FEA softwares such as FLAC, ADINA, or Aboqus were used to analyze steel tubular pile refilled concrete, these analysis results might be referenced to some standards on mircosteel tubular pile refilled concrete. An existing foundation underpinned was reinforced by micro-steel tubular piles refilled concrete and analyzed by 3D finite-difference method.The analysis results also shows that the modulus of micropiles had less effects than the initial pressure ratio for underpinning and the length of micropiles [3]. The bearing capability of mirco cast-in-place steel tubular pile under shaft load was researched by finite element method [4].…”

Section: Numerical Simulation Analysis Methodmentioning

confidence: 99%

Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Yong-kang

Zhong

Xiong

2022

J. Phys.: Conf. Ser.

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Steel tubular pile technology is an effective method to reinforced foundation in retrofitting of existing buildings. Mirco-steel tubular pile is constructed with concrete filled steel tubular, the infilled concrete could reinforced the strength of mirco-pile and prevented the local-buckling of steel tubular. According to ANSYS software, a mode of finite element analysis was built with some function between mirco-pile and soil foundation, the mode was confirmed by some test data. The slenderness ratio and material strength were two important factors for the bearing capability of mirco-pile with concrete filled steel tubular. The bearing capability and some influence factors on concrete filled mirco-steel tubular piles were analyzed by factors analysis method. The mode of finite element analysis and factors analysis method on were applied for reinforced building foundation and referred to other application of concrete filled steel tubular.

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“…At present, the truss-arch model is widely used in the shear calculation of concrete structures [16,17]. It is considered that the shear capacity of reinforced concrete structures is composed of the shear force of Advances in Civil Engineering the truss tie rod, the shear force of the truss strut, and the shear force assumed by the arch [18][19][20][21]. e shear-bearing capacity of the underpinning structure can be expressed as follows:…”

Section: E Formulation Of Practical Eoretical Formulas For Pile Foundmentioning

confidence: 99%

Experimental and Application Study on Underpinning Engineering of Bridge Pile Foundation

Liu

Wang

Chen

et al. 2018

Advances in Civil Engineering

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In order to study the theory and application of the pile foundation underpinning technology, 3 local node models of underpinning structures with a similarity ratio of 1/1 were made and the progressive repeated static loading tests were conducted. The shear and antislip properties of the joint are studied, and the improved formula for calculating the shear capacity is proposed. The results show that a planting bar plays a major role in shear resistance, and the hoop rate can improve the shear capacity of the interface. The new formula for calculating the shear-bearing capacity is proposed, and the calculation results of the formula of shear-bearing capacity are in good agreement with the experiment results. It is completely feasible to use this formula to calculate the shear-bearing capacity of the pile foundation underpinning structure. During the test, the bearing capacity of the model is good, which proves the reliability of the underpinning technology is good, and it can provide experimental and theoretical basis for the underpinning of similar projects.

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Numerical Analysis of Existing Foundations Underpinned by Micropiles

Cited by 27 publications

References 6 publications

The effect of combined loading on the behavior of micropiled rafts installed with inclined condition

The effect of combined loading on the behavior of micropiled rafts installed with inclined condition

Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Experimental and Application Study on Underpinning Engineering of Bridge Pile Foundation

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