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Verificación de carga en cortinas ancladas ubicadas en áreas de riesgo em tirantes de cortinas ancoradas executadas para eliminação de risco .. “Análise numérica do comportamento de cortinas atirantadas em solos”. More, J. Z. P. Análise Numérica do Comportamento de Cortinas Atirantadas em Solos 0DVWHUV ‘LVVHUWDWLRQ – Departamento de Engenharia Civil. Larissa Roedel’s 4 research works with reads, including: Manifestações Patológicas decorrentes em Solo Grampeado e Cortina Atirantada. Larissa.

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The simulated residual loads on the tie rods after 50 years for the same anchored curtains are shown in Figure 8 blue line. Using this geotechnical solution, it is possible to overcome any height and situation, but there are disadvantages, which include high implementation costs due to its time-consuming execution. The soil tends to settle over time, and the distributions of the grain particles and voids occupied by water are readjusted, which cause the material to consolidate and its resistance to increase.

Considering the uncontrolled growth in informal real estate uphill and surrounding these containment structures, soil contamination by aggressive agents such as sulfuric acid, which is highly corrosive to steel reinforcements, occurs in addition to increased overloads.

The conclusion is that the Plaxis 8. Portuguese term or phrase: Tese de Doutorado, Eng.

cortina atirantada

Table 2 Material properties of the anchored curtain. They are basically composed of reinforced concrete panels with pile foundations that are anchored to the ground using prestressed steel tie rods and that support the vertical loads of the contained slopes. The execution of an RLVT is shown in Figure 7 ; the test was performed during the structural recovery of the hillside containment structure, which had already accumulated additional overloads over the 50 years since it was built.

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Table 1 presents the geotechnical parameters used in the numerical modeling of the soil layers and earthwork for each anchored curtain.

Figure 7 Residual load verification testing underway. After comparing the results of the practical tests and the theoretical tests developed using the Plaxis 8.

These elements are only subjected to tensile stresses and are thus characterized by the axial stiffness AS. Its primary advantage is its potential application without having to cut anything beyond that necessary. This geotechnical solution constitutes the most adequate technical solution for containing the high horizontal forces resulting from deep excavations with minimum displacements of soil mass and structures located in the vicinity.

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In this case, the axial stiffness AS and the bending stiffness BS are determined by equations 34 and 5where is the modulus of elasticity, and t is the thickness of the curtain. The material property parameters used for modeling the reinforced concrete curtain are shown in Table 2.

A large presence of pathological manifestations was found, indicating that the service lives of the anchored curtains are less than the minimum of 50 years after their execution.

Portuguese PRO pts in category: It is necessary to atirantaads, evaluate, and classify the degree of aggressiveness of the environment and to know the concrete and qtirantadas of the structure, thus establishing the correspondence between both, i. Those results were compared corrtinas results obtained from residual load verification tests.

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Another important consideration in the case analysis is that it is hard to obtain information regarding the informal properties located uphill from the anchored curtains or their residents, either due to high resident turnover or the construction dynamics of the houses.

Patents, Trademarks, Copyright Law: Figure 4 Initial plasticity of the soil Plaxis.

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In the modeling carried out for the 20 anchored curtains, the soil behavior was investigated in relation to the shear strength, its plastification at the time of the execution of the structure, and its projection after 50 years of service life.

This is due to the fact that the curtain has three rows of tie rods, which impart a smaller variation on the forces on the soil structure. The execution of anchored curtains, although old, is among the most modern containment methods. Their main characteristic is the absence of adequate technical standards, often without surrounding urbanization and without important public services such as sanitary sewage and household waste collection.

It has been verified that there is no plastification of the soil in the upper section of the panel. Therefore, neither the elastic nor plastic behaviors of the soil change with increasing overload over time and although the boundary zone between the two soil behaviors cannot be determined, one concludes that it also does not undergo significant changes.

The Tijuca massif has the highest occupational density. The comparison shows that although the theoretical simulations indicate increases in loads over 50 years due to the additional overloads, the tie rods tend to lose load, even with increased overloads in the anchored curtains. Eneida Martins KudoZ activity Questions: It can be seen that the two lines that represent the tests simulated using the Plaxis computational system blue line and residual load verification test red line do not meet for any of the 20 anchored curtains surveyed over five years during this research.