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1
artículo
Publicado 2012
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The objective of this work is to provide a reliable numerical model using the finite element method (FEM) for the dynamic analysis of reinforced concrete (RC) structures. For this purpose, a computer program based on a strain-rate sensitive elasto-plastic theory is developed using 3D brick finite elements. The implicit Newmark scheme with predictor and corrector phases is used for time integration of the nonlinear system of equations. In addition, the steel reinforcement is considered to be smeared and perfectly adhered to concrete and represented by membrane finite elements. Two benchmark examples are analyzed with the present numerical model and results are compared with those obtained by other authors. The present numerical model is able to reproduce the path failure, collapse loads and failure mechanism within an acceptable level of accuracy.
2
artículo
Publicado 2012
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The objective of this work is to provide a reliable numerical model using the finite element method (FEM) for the dynamic analysis of reinforced concrete (RC) structures. For this purpose, a computer program based on a strain-rate sensitive elasto-plastic theory is developed using 3D brick finite elements. The implicit Newmark scheme with predictor and corrector phases is used for time integration of the nonlinear system of equations. In addition, the steel reinforcement is considered to be smeared and perfectly adhered to concrete and represented by membrane finite elements. Two benchmark examples are analyzed with the present numerical model and results are compared with those obtained by other authors. The present numerical model is able to reproduce the path failure, collapse loads and failure mechanism within an acceptable level of accuracy.
3
artículo
Publicado 2005
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The present report focuses on the behaviour of reinforced concrete structures under loads maintained constant in tinte. A procedure for combining linear short-time behaviour of concrete with nonlinear and linear creep functions is presented for analyzing plane franle structures. Creep produces stresses and strains redistribution over time in a reinforced concrete cross- section. In the case of statically indeterminate structures, this redistribution produces a variation in the final force diagrams. Also, creep relaxes induced stresses by a movement of a support with time as it is shown later. In comon structures, creep is more related to the control of defiexions, however. For that reason, some typical structures were analyzed by using a simplified and step-step method proposed by Ghali & Favre. The results show that there is not significance change in the final force diagrams of the...
4
artículo
Publicado 2018
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The purpose of this research is to contribute to preservation of our historical heritage represented in this study by the Cathedral of Tacna, making an analysis of the cathedral with emphasis on the dome through a model in a specialized software, using the Finite element tool. From the structural analysis carried out, it was determined that the dome of the cathedral of Tacna would fail in several points, for which reason the respective reinforcement with the Geosteel 2000 material is proposed, whose inclusion in the model realized results in an improvement in its capacity resistant. Finally it is concluded that it is necessary to reinforce the dome and the proposed material fulfills the function of improving the resistant capacity of it.
5
artículo
Publicado 2018
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The purpose of this research is to contribute to preservation of our historical heritage represented in this study by the Cathedral of Tacna, making an analysis of the cathedral with emphasis on the dome through a model in a specialized software, using the Finite element tool. From the structural analysis carried out, it was determined that the dome of the cathedral of Tacna would fail in several points, for which reason the respective reinforcement with the Geosteel 2000 material is proposed, whose inclusion in the model realized results in an improvement in its capacity resistant. Finally it is concluded that it is necessary to reinforce the dome and the proposed material fulfills the function of improving the resistant capacity of it.
6
artículo
Publicado 2018
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The purpose of this research is to contribute to preservation of our historical heritage represented in this study by the Cathedral of Tacna, making an analysis of the cathedral with emphasis on the dome through a model in a specialized software, using the Finite element tool. From the structural analysis carried out, it was determined that the dome of the cathedral of Tacna would fail in several points, for which reason the respective reinforcement with the Geosteel 2000 material is proposed, whose inclusion in the model realized results in an improvement in its capacity resistant. Finally it is concluded that it is necessary to reinforce the dome and the proposed material fulfills the function of improving the resistant capacity of it.
7
artículo
Publicado 2024
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Reinforced concrete exposed to high temperatures, such as in a fire, poses a serious threat to buildings by weakening the concrete and reducing the structure's stiffness. Therefore, the article investigated the structural behavior of reinforced concrete when subjected to elevated temperatures in Peru, where many structures are not designed to withstand high temperatures, leading to irreparable damages such as loss of human lives and changes in material properties. To enhance the heat resistance of reinforced concrete, carbon fibers were added, and a percentage of ultra-high-strength concrete was incorporated. The material was analyzed using the finite element method. Different frames were evaluated, focusing on the use of matrices and nodes. The proposal involved adding new materials; carbon fibers were added at 0.06%, and ultra-high-strength concrete at 20%. These quantities were chosen...
8
artículo
Publicado 2025
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Visual inspection is a common method for detecting structural damage, but has limitations in terms of subjectivity, time, and access. This research proposes an innovative approach to identify cracks using a 3D model generated from photographs of an unmanned aerial vehicle (UAV) and the use of a convolutional neural network (CNN). These networks are effective in detecting complex patterns, improving the accuracy and efficiency of damage identification based on simple visual inspection. The case study is the old Villena Rey bridge in Lima, Peru. The methodology covers (i) the development of a 3D model of the bridge structure, (ii) the extraction of photographs of the model and its binary segmentation, (iii) the application of deep learning through the training and testing phase of a CNN to achieve crack detection in photographs, and (iv) damage location within the 3D model. An 88.4% accura...
9
artículo
Publicado 2021
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The fire in the structure causes the temperature of the concrete surface to increase, thus reducing its resistance to compression, bending and elastic modulus. Although concrete has a poorer conductor than steel, the constant high temperature on the surface causes gradual heating in its inner layer. As a building material, concrete is widely used due to its high resistance to fire, it is essential to withstand one of the most severe disasters that a structure can withstand in its life. The objective of this document is to carry out a systematic review of the effects that fire has on the mechanical and thermal properties of reinforced concrete structures. 50 articles published in a database indexed between the years 2011 and 2021 were reviewed, distributed as follows: 28 in Scopus, nine in Web of Science, eight in Scielo, three in ScienceDirect and two in EBSCO, referring to concrete resi...
10
artículo
Publicado 2021
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The fire in the structure causes the temperature of the concrete surface to increase, thus reducing its resistance to compression, bending and elastic modulus. Although concrete has a poorer conductor than steel, the constant high temperature on the surface causes gradual heating in its inner layer. As a building material, concrete is widely used due to its high resistance to fire, it is essential to withstand one of the most severe disasters that a structure can withstand in its life. The objective of this document is to carry out a systematic review of the effects that fire has on the mechanical and thermal properties of reinforced concrete structures. 50 articles published in a database indexed between the years 2011 and 2021 were reviewed, distributed as follows: 28 in Scopus, nine in Web of Science, eight in Scielo, three in ScienceDirect and two in EBSCO, referring to concrete resi...
11
artículo
Publicado 2021
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In this investigation, the elasto-plastic behavior and the seismic performance of concrete reinforced frame structures reinforced are evaluated by applying the Pushover method. This evaluation is done on several cases: with high ductility steel (Grade 40), conventional steel (Grade 60) and high strength steel (Grade 75). For the previous, the capacity curve graph obtained from the displacement coefficient method was used to measure the capacity of the structure. In addition, the performance of the structure for different levels of seismic design are evaluated with the resulting values of ductility and rigidity of each case. The results showed that reinforcing a structure with a Grade 40 reinforcing steel increases the energy dissipation capacity, and if reinforced with a Grade 75 reinforcing steel increases the strength capacity in the structure. Finally, the comparative result of the va...
12
artículo
Publicado 2022
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Lima, the capital of Peru, has not suffered from a great earthquake since 1746, making this a prone Mw 8.8 earthquake area according to seismological studies. In this context, seismic structural health monitoring presents an opportunity to assess rapidly buildings after a great earthquake and protect inhabitant from those buildings with high risk of collapse due to aftershocks. A basic seismic structural health monitoring arrangement of a fifteenth-floor residential building is presented using a low-cost sensor called Raspberry Shake 4D. The implemented sensor incorporates both a vertical velocity geophone and three orthogonally positioned microelectromechanical systems accelerometers. The building is a reinforced concrete shear walls structure located in Comas, north of Lima. More than thirty seismic events have been recorded, including the Mw 8.0 Lagunas earthquake (05/26/2019) and the...
13
artículo
Publicado 2024
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Seismic risk is a challenging problem in tall buildings due to the possibility of loss of human life and economic caused by seismic events. Peru is located at the interaction of the South American plate and the Nazca plate, which is why various seismic events of moderate to large magnitude occur. Today there are many ways to solve these problems and it is a very challenging case to reinforce tall buildings. In addition, technological advances in software facilitate and help through programmed models in tall buildings that analyze their structure characteristics such as drift, shear and others. This article proposes a comparative analysis of three types of dissipators: viscous fluid, friction, and metal creep through a Time-History analysis in a 15-story high-rise building located in Peru. The proposed methodology considers three stages: (i) definition of the characteristics and propertie...
14
tesis de grado
Publicado 2024
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In construction projects, there may be rework and delays associated with construction processes with a low level of industrialization, resulting from the lack of constructability of the designs. To promote industrialization and improve the project's constructability, we implemented the Virtual Design & Construction (VDC) methodology, combined with a system of prefabricated reinforcement cages (PRC) elements in constructing an 870- meter span bridge located in Lima, Peru. The objective was to reduce structural rebars' assembly times, replace the traditional on-site processes of cutting, bending, and assembling steel with an industrial process based on systems of PRC steel elements. As a result, the assembly times of the structural item were reduced by 31%, thanks to the use of PRC elements. In addition, due to the VDC methodology, a 100% buildable design of the PRC elements was achieved.
15
artículo
Publicado 2023
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The essence of this research is the development of a working model in which two fundamental tools that control the quality of a finished product are brought together. In this case, the synergy is between the BIM methodology and the Lean Construction philosophy, which will be applied together to improve the quality control of the finished product of a retail construction project. Retail projects which are large investment projects, for which the owners demand high quality in the final product. The work model proposed in this study aims to solve the problem of customer dissatisfaction or dissatisfaction with the final product of a retail construction project. The disagreement on the part of the end user is mainly due to poor quality control during all stages of the project. Based on academic articles and previous studies, a procedure will be proposed in which both the Lean Construction too...
16
artículo
Publicado 2025
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In highly seismic regions, many buildings lack modern energy dissipation mechanisms, increasing their vulnerability. Therefore, this research aimed to analyze the distribution of seismic energy across the different levels of prototype structures with 3, 6, and 9 stories, retrofitted with CRP-type hysteretic dampers, using the energy balance method. The capacity curves of each structure were initially determined using nonlinear pushover analysis; subsequently, the retrofitted models were evaluated with two types of nonlinear dynamic analyses. The first, using three ground motions scaled to the design level, showed a significant reduction in distortions after retrofitting. The second, with 25 ground motion records scaled up to the collapse threshold, allowed an assessment of the accumulation and distribution of dissipated energy on each floor. The processing of displacement and shear force...
17
artículo
Publicado 2020
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The seismic design of buildings is usually performed using one-way analysis for each of main axes independently. However, seismic events have fairly random behaviour and impose bidirectional solicitations on structures. In this work, the study of the response in structures subjects to earthquake loads with irregularity of l-shaped plan and soft story is carried out. For this, the linear time-story analysis (LTHA) of these has been carried out imposing seismic solicitations in two orthogonal directions. Thus, the structural response with incidence angle variations of 10 is obtained and compared with the response derived from the unidirectional analysis. Variations of up to 50% and 72% are obtained for model structures with l-shaped plan and soft story respectively.
18
artículo
Publicado 2024
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One environment that hinders the performance of reinforced concrete is fire. In most cases, this results in the affected part or the entire structure being rendered useless or completely collapsing. When fire mishaps happen in structures, this is the case. This study reviews green structural retrofitting materials for reinforced concrete buildings in an effort to repair damaged structures in an environmentally friendly manner. The information gathered from earlier laboratory test results is assembled to comprehend the impact of room temperature strength properties and varied concrete mix material composition on the residual mechanical properties of concrete. The performance of various fibers, synthetic and natural, as laminate materials for concrete were evaluated, and the study showed that to a significant extent, distressed structural elements could be repaired with retrofits. However,...
19
artículo
Publicado 2019
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This paper initially describes aspects of the modeling of structures equipped with energy dissipators Shear Link Bozzo (SLB) and develops two iterative design procedures to select these devices. This methodology is applied to a precast 5-story reinforced concrete building. The SLB energy dissipation devices are initially stiff, but ductile with a range of yielding forces from 36 kN to 900 kN characterized by 52 + 52 standard devices. Moreover, these devices can be combined in parallel giving a very wide range of possibilities for selection and corresponding structural response. Therefore, to simplify its automatic selection, this article presents two procedures: (1) direct iteration and (2) inverse or fixed force iteration. Both procedures were implemented in an automatic application or “plugin” for the ETABS program that automates its selection for a specific structural system or ar...
20
artículo
Publicado 2019
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This paper initially describes aspects of the modeling of structures equipped with energy dissipators Shear Link Bozzo (SLB) and develops two iterative design procedures to select these devices. This methodology is applied to a precast 5-story reinforced concrete building. The SLB energy dissipation devices are initially stiff, but ductile with a range of yielding forces from 36 kN to 900 kN characterized by 52 + 52 standard devices. Moreover, these devices can be combined in parallel giving a very wide range of possibilities for selection and corresponding structural response. Therefore, to simplify its automatic selection, this article presents two procedures: (1) direct iteration and (2) inverse or fixed force iteration. Both procedures were implemented in an automatic application or “plugin” for the ETABS program that automates its selection for a specific structural system or ar...
