Diagnosis and Assessment of Deep Pile Cap Foundation of a Tall Building Affected by Internal Expansion Reactions

Silva, Fernando A. N.; Delgado, J. M. P. Q.; Tahlaiti, Mahfoud; Khelidj, Abdelhafid; Nascimento, N.; Lima, António G. B.

doi:10.3390/buildings11030104

Cited by 4 publications

(4 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The next direction or development of the field of bending piles discussed in this paper could involve the areas described below. One development could be the solution of a group of piles for common foundation structures as outlined in [28], in terms of the design of the pile itself, the reinforcement of the pile could be addressed in detail. The optimal reinforcement of the pile as outlined in [29] may be relevant for sustainable development.…”

Section: Discussionmentioning

confidence: 99%

Analysis of a Bending-Stressed Pile in Interaction with Subsoil

Jendželovský

Tvrdá

2023

Buildings

View full text Add to dashboard Cite

This study explored reinforced concrete piles located in a flexible half-space and loaded with external loads, considering various contact elements and the connection between the pile and the ground massif. Piles are mainly solved as axially loaded elements stressed by a vertical force. However, there are also several cases in the construction industry where a pile is stressed by a horizontal force or by a bending moment, producing a bending loaded pile. A static model of a pile and the surrounding subsoil was constructed using software based on FEM. The pile was modelled from 3D finite elements that were rotationally symmetric around the vertical axis of the pile. Additionally, the flexible half-space was modelled from 3D elements that were rotationally symmetrical around the piles. The boundary conditions were applied on the surfaces around the perimeter and at the bottom of the ground massif. The flexible half-space was modelled up to the area where there was zero deformation. The presented analysis focused on the description of different types of contact elements between the surface of the reinforced concrete pile and the surrounding ground mass. This interaction was modelled as a fixed connection or as point-to-point contact, and a contact surface. In the next part, different boundary conditions on the pile bottom were considered. Floating piles, supported by joints or firmly woven into the ground massif, were considered. All these outputs based on FEM were compared with the analytical solution of the bent pile that was published in the 1980s. The deformations and internal forces during different modelling of the contact between the edge of the concrete pile and the surrounding ground mass were compared. The higher values of the studied quantities were for rigid connections, which is logical. For contact elements, the property of the contact was considered. This property introduces less stiffness, and thus, the resulting values were lower compared to those for a fixed connection. The presented analysis of the FEM analytical and numerical solution is also very valuable for engineers working in construction.

show abstract

Section: Discussionmentioning

confidence: 99%

Analysis of a Bending-Stressed Pile in Interaction with Subsoil

Jendželovský

Tvrdá

2023

Buildings

View full text Add to dashboard Cite

show abstract

“…Assessment of the structural behavior of the material under mechanical and environmental loads usually requires consideration of its viscosity, elasticity, and plastic behavior. Thus, the material can be considered as an elasto-viscoplastic material, and its deformation properties can result from shrinkage, creep, and damage phenomena (in compression or tension) [2].…”

Section: Introductionmentioning

confidence: 99%

Chemical and Creep Models Applied to Concrete Damaged by Alkali–Silica Reactions

Roma,

Silva,

Bourbatache

et al. 2023

Buildings

Self Cite

View full text Add to dashboard Cite

Concrete structures that experience internal swelling reactions are often affected by other deleterious mechanisms, such as creep and shrinkage. In Brazil and many other countries around the world, numerous cases of building foundations and concrete dams were investigated due to the damage associated with internal expansions. Macroscopic models for the numerical representation of these expansions must take into account the influence of key environmental parameters such as temperature, degree of saturation, and the rate of development of the chemical reaction. To be relevant in structural applications, concrete creep models must consider several important phenomena, such as non-linearity, multi-axiality, and thermal and drying effects. In order to prevent these pathologies, to plan rehabilitation work, and to develop new design procedures, numerical simulation using the finite element method (FEM) is a very useful tool. This work aimed to implement a chemical model to simulate the advancement of the internal expansion reactions and a mechanical model to simulate creep and shrinkage phenomena in COMSOL Multiphysics® to reassess concrete structures suffering from these mechanisms. Both models were implemented separately to evaluate their responses and compare them with the theoretical results and experimental benchmarks proposed by the developers of these models. The numerical results obtained presented an excellent agreement with the experimental results, with a deviation of less than 10%, which showed that the implementation of the developed numerical models was very efficient. Moreover, this research holds significant importance as the mathematical models used to simulate internal expansions in concrete are currently only available in limited-use FEM software’s. Therefore, demonstrating the successful implementation of these models in widely used finite element programs and their ability to produce reliable results would be a valuable contribution.

show abstract

“…The cracking caused by internal chemical reactions, such as delayed etrringite formation and alkali silica reaction (ASR), is one of the major durability problems in concrete structures [ 1 , 2 , 3 ]. ASR has been viewed as a ‘cancer’ in concrete structures since it was firstly discovered and named by Stanton in the 1940s [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

et al. 2021

View full text Add to dashboard Cite

The microstructure of alkali-reactive aggregates, especially the spatial distribution of the pore and reactive silica phase, plays a significant role in the process of the alkali silica reaction (ASR) in concrete, as it determines not only the reaction front of ASR but also the localization of the produced expansive product from where the cracking begins. However, the microstructure of the aggregate was either simplified or neglected in the current ASR simulation models. Due to the various particle sizes and heterogeneous distribution of the reactive silica in the aggregate, it is difficult to obtain a representative microstructure at a desired voxel size by using non-destructive computed tomography (CT) or focused ion beam milling combined with scanning electron microscopy (FIB-SEM). In order to fill this gap, this paper proposed a model that simulates the microstructures of the alkali-reactive aggregate based on 2D images. Five representative 3D microstructures with different pore and quartz fractions were simulated from SEM images. The simulated fraction, scattering density, as well as the autocorrelation function (ACF) of pore and quartz agreed well with the original ones. A 40×40×40 mm3 concrete cube with irregular coarse aggregates was then simulated with the aggregate assembled by the five representative microstructures. The average pore (at microscale μm) and quartz fractions of the cube matched well with the X-ray diffraction (XRD) and Mercury intrusion porosimetry (MIP) results. The simulated microstructures can be used as a basis for simulation of the chemical reaction of ASR at a microscale.

show abstract

Diagnosis and Assessment of Deep Pile Cap Foundation of a Tall Building Affected by Internal Expansion Reactions

Cited by 4 publications

References 30 publications

Analysis of a Bending-Stressed Pile in Interaction with Subsoil

Analysis of a Bending-Stressed Pile in Interaction with Subsoil

Chemical and Creep Models Applied to Concrete Damaged by Alkali–Silica Reactions

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

Contact Info

Product

Resources

About