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.
|Published (Last):||12 November 2011|
|PDF File Size:||8.70 Mb|
|ePub File Size:||20.79 Mb|
|Price:||Free* [*Free Regsitration Required]|
Cortinas Atirantadas – CVA by Ricardo Oliveira on Prezi
The main massif is known as the Tijuca massif and is located in regions of the southern and northern zones and downtown area of the city. Tese de Doutorado, Eng. It has been verified that there is no plastification of the soil in the upper section of the panel.
An anchored curtain is a reinforced concrete structure that has a specific geometry and is comprised of large vertical panels of slabs with reinforcements in the support region tie rods and structural steel elements that anchor it to the ground. In the modeling carried out for the 20 anchored curtains, the soil behavior was investigated in relation to the shear strength, its plastification at atirantzdas time of the execution of the structure, and its projection after 50 years of service life.
In the first phase, the continuous medium or domain of the problem is divided into sub-domains called finite elements that are connected by a finite number of nodal points or, more simply, nodes. Figure 7 Residual load verification testing underway. Numerical finite element analyses requiring software aids are widely used to solve structural engineering problems.
With the development of computers, finite-element numerical modeling has become a powerful and widely used tool for analyzing containment structures in geotechnical environments.
In addition, several of these structures present either losses or increases in work load on their tie rods, the values of which are often different from the loads incorporated at the times of the execution of the structures. It is recommended, for the good development of the modeling of cortjnas curtain, that the conditions of plane state deformation be satisfied.
In addition to the practical tests used to evaluate the load behaviors of the tie rods over time, theoretical tests of the rods were atirantadaas out using the Plaxis computational tool, which allows simulations of increases in overload due to increases in residential and other buildings uphill from the anchored curtain occurring throughout the years. Residual load verification tests on anchored curtain tie rods must be performed every five years to obtain residual load values.
Landslide susceptibilities in hazardous areas.
The calculation model is a two-dimensional geometric model with length and height dimensions. Return to KudoZ list. In the curtain anchorage modeling, different atirrantadas are observed and divided into free and anchored sections. Because the modeling is two-dimensional, soil deformations occurring between the anchor lines perpendicular to the presented model are completely ignored.
These reinforced concrete structures are subjected to aggressive attacks by agents in the sanitary sewage originating from informal buildings and leachates from uncollected garbage, both of which cause pathological manifestations that decrease the service lives of these structures. The city of Rio de Janeiro, which is known for both the tragedies caused by landslides on its slopes and the crotinas formed by the encounter of the ocean with the mountains, has built more than eleven thousand interventions on hillsides located at different sites in the municipality over the past 50 years.
The simulated residual loads on the tie rods after 50 years for the same anchored curtains are shown in Figure 8 blue line. Term search Jobs Translators Clients Forums. Material properties of the anchored curtain.
The city of Rio de Janeiro is known worldwide for its natural beauty, which is mainly characterized by its particular geomorphology, i. Care must be observed with issues such as data entry, specification of soil and material parameters, spacing of the tie rods, and the distribution of the forces applied to the tie rods in this measurement.
The anchoring bulb is modeled using one element per meter having only axial stiffness, which is denominated in Plaxis as a “geogrid”. Automatic update in Figure 3 Schematic representation of the finite element analysis Tschiptschin, Landslides in the hills of the city of Rio de Janeiro are a cyclical phenomenon that lead to enormous economic and social damage that includes road blockages and the destruction of common types of houses, resulting in homelessness and in many cases loss of life.
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.
It is recommended that the developer of the Plaxis 2D geotechnical and structural computational tool review the modeling of anchored curtain structures while considering the temporal development of the loads on the tie rods anchored to the ground due to the increase in overload of the contained slope considered in the proposed model.
The reinforcing bars of a hillside containment structure must absorb the tensile and compressive stresses arising primarily in the vertical parameters of the anchored curtains, which are dimensioned to resist not only bending but also the punching shear in the region of the tie rods. Elizabeth Sabido Maldonado, Km. For the plastified region of the soil, on the other hand, cortinxs rigid plastic model with resistance parameters such as cohesion and angle of friction of the soil, which are related to its stability and rupture, would be used.
According to Lopesthe finite element method FEM is the most commonly used numerical method employed in geotechnical civil engineering due to its ease in dealing with heterogeneous, nonlinear nonlinear elasticity and plasticity and time dependent viscosity and densification problems. High unemployment rates, informal growth, real estate speculation, a lack of housing policies for the low-income population and an unsatisfactory public transportation system are among the reasons for the growth of the favelas in the municipality of Rio de Janeiro.
You have native languages that can be corhinas You can request verification for native languages by completing a simple application that takes only a couple of minutes.
Due to the increasing problems of early degradation observed in the structures, new competitive needs, and sustainability requirements in the civil construction sector, in the last two decades there has been a worldwide tendency to focus on design aspects related to durability and the extension of the service life of reinforced and prestressed concrete atiranatdas CLIFTON, On the hillsides of the city of Rio de Janeiro, where most of these containment constructions are located, poor communities grow, and informal residential properties are constructed.
Login or register free and only takes a few minutes to participate in this question. This type of failure is prevented by adequate Although the FEM modeling employing the Plaxis 8. Eneida Martins KudoZ activity Questions: Term search All of ProZ.
The method employs prestressed rods and anchors to support atirrantadas terrain. Several concepts are used to address the landslide problem and its forms of investigation.
Load check on anchored curtains located in geotechnical hazard areas in the city of Rio de Janeiro
With increasing overloads over time, a second plastification occurs in the lower part of the panel of the anchored curtain, with a small cortonas in the plastification zones of the contained soil. The Tijuca massif has the highest occupational density. Peer comments on this answer and responses from the answerer. The approximately 2, structures that have served as the primary solution for geological-geotechnical hazard mitigation in the city of Rio de Janeiro for 50 years since the creation of GEO-RIO require special maintenance attention and interventions to restore and extend their service lives.
The loads on the tie rods in reinforced concrete structures of the hillside containment structures located in the city of Rio de Janeiro need to be evaluated.