Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
para structural » para estructuras (Expander búsqueda), para estructurar (Expander búsqueda), para estructura (Expander búsqueda)
concrete » concreto (Expander búsqueda)
para structural » para estructuras (Expander búsqueda), para estructurar (Expander búsqueda), para estructura (Expander búsqueda)
concrete » concreto (Expander búsqueda)
1
artículo
Publicado 2012
Enlace
Enlace
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
Enlace
Enlace
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
Enlace
Enlace
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 2020
Enlace
Enlace
From the acquisition of a press for Concrete Earth Blocks (CEB) that is in disuse and as part of the project of a workshop for a small construction company, this research is carried out on the production process of these Interlocked Concrete Earth Blocks, the selection of suitable soils and stabilizers selected for its elaboration, the execution of masonry with this type of block, the study of its production costs and comparison with the costs of other masonry.
5
artículo
Publicado 2020
Enlace
Enlace
From the acquisition of a press for Concrete Earth Blocks (CEB) that is in disuse and as part of the project of a workshop for a small construction company, this research is carried out on the production process of these Interlocked Concrete Earth Blocks, the selection of suitable soils and stabilizers selected for its elaboration, the execution of masonry with this type of block, the study of its production costs and comparison with the costs of other masonry.
6
artículo
It is getting more frequent the deteriorated work rehab, the corrections of design flaws or poor constructive process. Because of this, it is required not only to rehabilitate but to rearrange the structures taking into consideration that that intervention have to fulfill the mechanic improvements. This research intents to make known the benefits that the reinforced polymer composite systems with carbon fiber give to improve the mechanical performance of structural concrete elements. The results of the resistance to the compression trials at 28 days of the unreinforced specimens was of 12 MPa, and with the incorporation of the reinforced polymer with carbon fiber (RPCF) at 100% it improves 2.67 times its resistance (32.04 MPa), while the reinforced specimens at 50%, improves 1.57 times its resistance (18.84 MPa). It can be concluded that the application of the RPCF, considerably increase...
7
artículo
It is getting more frequent the deteriorated work rehab, the corrections of design flaws or poor constructive process. Because of this, it is required not only to rehabilitate but to rearrange the structures taking into consideration that that intervention have to fulfill the mechanic improvements. This research intents to make known the benefits that the reinforced polymer composite systems with carbon fiber give to improve the mechanical performance of structural concrete elements. The results of the resistance to the compression trials at 28 days of the unreinforced specimens was of 12 MPa, and with the incorporation of the reinforced polymer with carbon fiber (RPCF) at 100% it improves 2.67 times its resistance (32.04 MPa), while the reinforced specimens at 50%, improves 1.57 times its resistance (18.84 MPa). It can be concluded that the application of the RPCF, considerably increase...
8
artículo
Publicado 2020
Enlace
Enlace
Ash is a waste product of different commercial activities. For the paper industry, the disposal of this residue, which results from the combustion of the coal used in the production process, represents a problem. For this reason, its use in the production of concrete blocks has been evaluated. The objective of this study is to compare the thermographic response of industrially-manufactured, non-structural concrete blocks that have been prepared with this ash. Additionally, the mechanical behavior of the blocks is compared when the ash is replaced on a percentage basis with cement. Likewise, substitutions of 10, 20, 30 and 40% of ash for cement were made for blocks that were prepared in accordance with quality control requirements of a concrete block plant. Specialized techniques such as X-ray diffraction and microscopy demonstrated the absence of toxic substances in the ash. The study re...
9
artículo
Publicado 2021
Enlace
Enlace
In this research named “Baked clay as a fine aggregate to improve the mechanical properties of structural concrete”, it was taken into consideration the relations water/concrete between 0.55 and 0.65 for a resistence to the axial compression of f´c =210 kg/cm2. In the present investigation it was taken into account that the material is affected by the precense of high concentrations of chlorides and sulfates, because of its high porosity and permeability that make it fragile and weak not recommendable for structures with armed reinforcement. The natural fine aggregate was replaced by baked clay on different proportions (0, 15, 20 and 25%) analyzing the clay chemical properties, as well as the hardened concrete mechanical properties (flexion, tension and compression at 28 days). The outcomes of the trials indicate the viability of using ground baked clay as a fine aggregate in ...
10
artículo
Publicado 2021
Enlace
Enlace
In this research named “Baked clay as a fine aggregate to improve the mechanical properties of structural concrete”, it was taken into consideration the relations water/concrete between 0.55 and 0.65 for a resistence to the axial compression of f´c =210 kg/cm2. In the present investigation it was taken into account that the material is affected by the precense of high concentrations of chlorides and sulfates, because of its high porosity and permeability that make it fragile and weak not recommendable for structures with armed reinforcement. The natural fine aggregate was replaced by baked clay on different proportions (0, 15, 20 and 25%) analyzing the clay chemical properties, as well as the hardened concrete mechanical properties (flexion, tension and compression at 28 days). The outcomes of the trials indicate the viability of using ground baked clay as a fine aggregate in ...
11
artículo
Publicado 2019
Enlace
Enlace
In order to investigate the seismic behavior of the concrete Diagrid structures, 03 models of 06-level buildings are proposed with a typical 30 m x 37.5 m plant located in an area of high seismicity in Peru. A comparative analysis has been made between two structural systems on the one hand the conventional or orthogonal system and on the other the Diagrid system of reinforced concrete, for the latter two types or models that we will call type A and type B, whose modulation will be analyzed, will be analyzed. every 02 and 04 floors respectively. The three models will have the same characteristics; roofed area, dimensions in plan and elevation, construction materials and loading loads, geographical location, soil type, use and importance, Basic Coefficient of Reduction of the Seismic Force (Ro), these characteristics generate the factors that are regulated by E.030.2016 that defines the p...
12
artículo
Publicado 2019
Enlace
Enlace
In order to investigate the seismic behavior of the concrete Diagrid structures, 03 models of 06-level buildings are proposed with a typical 30 m x 37.5 m plant located in an area of high seismicity in Peru. A comparative analysis has been made between two structural systems on the one hand the conventional or orthogonal system and on the other the Diagrid system of reinforced concrete, for the latter two types or models that we will call type A and type B, whose modulation will be analyzed, will be analyzed. every 02 and 04 floors respectively. The three models will have the same characteristics; roofed area, dimensions in plan and elevation, construction materials and loading loads, geographical location, soil type, use and importance, Basic Coefficient of Reduction of the Seismic Force (Ro), these characteristics generate the factors that are regulated by E.030.2016 that defines the p...
13
artículo
Publicado 2019
Enlace
Enlace
In order to investigate the seismic behavior of the concrete Diagrid structures, 03 models of 06-level buildings are proposed with a typical 30 m x 37.5 m plant located in an area of high seismicity in Peru. A comparative analysis has been made between two structural systems on the one hand the conventional or orthogonal system and on the other the Diagrid system of reinforced concrete, for the latter two types or models that we will call type A and type B, whose modulation will be analyzed, will be analyzed. every 02 and 04 floors respectively. The three models will have the same characteristics; roofed area, dimensions in plan and elevation, construction materials and loading loads, geographical location, soil type, use and importance, Basic Coefficient of Reduction of the Seismic Force (Ro), these characteristics generate the factors that are regulated by E.030.2016 that defines the p...
14
artículo
Publicado 2021
Enlace
Enlace
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...
15
artículo
Publicado 2021
Enlace
Enlace
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...
16
artículo
Publicado 2025
Enlace
Enlace
This study analyzes the seismic fragility of Peruvian electrical substations by applying fragility functions generated with multiple nonlinear dynamic time-history analyses, with respect to the structural variability of concrete compressive strength (f'c) and yield strength of the reinforcing steel (fy), and the uncertainty in a seismic factor of peak ground acceleration (PGA). The study, with a quantitative approach and experimental design, was applied and explanatory in scope. The random method was considered for the generation of 2000 samples of structural factors and 2000 artificial accelerograms of spectro-compatible earthquakes compatible with real Peruvian signals. The calculations reveal that maximum displacements (Dmax), maximum drifts (Δmax) and shear forces at the base (Vb) are more conservative than in previous studies, attributable to nonlinear modeling with plastic hinges ...
17
artículo
Publicado 2022
Enlace
Enlace
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...
18
tesis de grado
Publicado 2024
Enlace
Enlace
Este estudio revisa el uso de pruebas no destructivas (NDT) para detectar daños en edificaciones de hormigón armado reforzado con polímeros y fibra. Se destacan metodologías en las cuales se analizaron a texto completo 35 artículos científicos publicados entre el 2020 y 2024 en base datos tales como Scopus, SciELO y Web of Science. Los resultados indican que los instrumentos de las técnicas de pruebas no destructivas (NDT) han avanzado considerablemente en precisión y facilidad de interpretación gracias a los avances en visualización gráfica e imágenes en 3D. Instrumentos como la termografía infrarroja, el radar de penetración terrestre (GPR) y las pruebas ultrasónicas ofrecen un nivel de detalle y confiabilidad que superan a los métodos tradicionales, al permitir la detección de irregularidades internas sin dañar las estructuras. Sin embargo, la falta de métodos de mo...
19
tesis de maestría
Publicado 2012
Enlace
Enlace
El papel de los materiales compuestos en el campo del refuerzo estructural es indiscutible. Numerosos trabajos de investigación y logros prácticos han demostrado la efectividad de la técnica de rehabilitación de edificios y obras de arte al pegar elementos de refuerzo externo. Al principio, las placas de acero se usaban como elementos de refuerzo, pero fueron reemplazadas gradualmente por materiales compuestos. El uso cada vez más frecuente de materiales compuestos puede explicarse, por un lado, por sus mejores propiedades mecánicas y, por otro lado, por el progreso en los procesos de fabricación durante las últimas décadas. Habiéndose vuelto más accesibles económicamente, los materiales compuestos son una solución muy atractiva para satisfacer la necesidad de fortalecer edificios y obras de arte. En este trabajo de investigación, nos interesó el estudio del comportamiento...
20
artículo
Publicado 2024
Enlace
Enlace
Photoluminescence is revolutionizing construction, especially in concrete pavements and structures, by offering both aesthetic and functional improvements. Photoluminescent pigments, which store and emit light, can positively influence the physical-mechanical properties of concrete. This study examines pigments such as strontium aluminate, zinc silicate, zinc phosphate and calcium fluorescence, evaluating their emission life and their impact on the compressive strength and durability of concrete. Photoluminescent pigments absorb light energy and release it in the form of visible light, providing prolonged luminescence. Strontium aluminate stands out for its high intensity and durability, significantly improving the compressive strength of concrete. Zinc phosphate also offers long emission and is highly resistant to moisture. Zinc silicate improves wear resistance, while calcium fluoresce...
