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1
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...
2
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...
3
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...
4
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,...
5
artículo
Publicado 2020
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The continuous population increase in recent years requires a greater number of households to be built quickly, with good materials and produced under quality standards that guarantee their manufacturing process. The prefabricated concrete, produced and supplied by concrete plants, is poured into the different structural elements, the mezzanine slabs being the most careful surfaces in the appearance of fissures; because being horizontal and having larger dimensions, the dimensional changes in the concrete appear more frequently due to the rapid loss of water from the surface of the concrete before setting; which generates superior stresses to the resistant capacity of the concrete at early ages, which affect the durability and reduce the resistance of the structures, causing greater economic expenses in maintenance and repairs. In the present investigation, 5%, 10% and 15% of rice husk a...
6
artículo
Publicado 2024
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This experimental work hopes to provide a potential solution by proposing techniques to improve the axial resistance capacity of reinforced concrete walls, using high-strength carbon filaments, and proposing a practical methodology for reinforcing existing reinforced concrete columns and walls. The methodology used to improve this work consists of the exploration and experimentation of two explicit parts, the first being a progression of material tests carried out in the laboratories of the Pontificia Universidad Católica del Perú, with the purpose of determining the direct mechanical properties. and not direct. The second part of the work included the analysis of the reinforced concrete walls through the non-linear concept modeled with the finite element method, verifying the non-linear attributes of the concrete by increasing the high-resistance carbon fiber. The results found have b...
7
tesis de grado
Publicado 2024
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Chaotic bioprinting enables the fabrication of microstructured hydrogel fibers with co-extruding permanent and fugitive inks using a kenics static mixer (KSM) printhead. However, these fibers degrade completely after 7 days of static culture. Survival of hydrogel constructs for prolonged periods is critical for tissue maturation. Therefore, in this project, chaotic bioprinting was optimized to reinforce multichannel hollow fibers, thereby extending the culture time to enable skeletal muscle tissue maturation. A KSM printhead equipped with eight inlets and two mixing elements was used to print hydrogel fibers with three materials: a bioink suitable to load cells, a sacrificial material to create hollow channels, and a structural material to provide mechanical stability (without cells). Each bioink layer was placed 62.5 µm apart from a hollow channel. Furthermore, the optimal ratio for ea...
8
artículo
Publicado 2018
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The purpose of this research is to characterize the anatomical structure and physical-mechanical properties of the aerial roots of Heteropsis flexuosa "tamshi wire" (Araceae) exposed to different conditions of humidity and aging treatments. The characteristics of the anatomical elements of the roots confirm the presence of three visibly differentiated zones, observing in the non-peripheral stela a large number of compressed fibers that provide resistance to the roots. Regarding the physical tests, the moisture content of the roots in green condition was 84.9% and in dry condition to the air it was of 15.9%; the linear density was 65.09 g / m. The values of the mechanical properties of the roots without aging were lower than those obtained with aging; the elongation was 1.4% and 0.97% compared to the initial length, the TEA (tensile energy absorption) was 31138.07 J / m2 and 15577.4...
9
artículo
Publicado 2025
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In the present study, the incremental static or pushover analysis will be used, since it offers more accurate results compared to the linear analysis. Therefore, its application is indispensable for the evaluation of the seismic performance of a reinforced concrete structure composed of beams, columns and walls. This structure is a multi-family building of 6 levels, rectangular in shape with an area of 120 m2. The methodology used allows obtaining the capacity of the structure against applied lateral loads, thus determining the performance levels for each level of seismic hazard according to the VISION 2000 guidelines. The study begins with an exhaustive analysis of the geometry, structural elements of the building, the use of standards and guidelines related to seismic resistance. However, two 3D structural models were created in Etabs V.21, called model 1 and model 2. In model 1, the n...
10
artículo
Publicado 2023
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The use of concrete bricks in buildings causes 12% of structural failures due to the structural overload generated by masonry walls made with this type of material. In this research, it was proposed to reduce the weight of Type I concrete bricks without affecting their resistance, for which materials such as banana fiber and concrete demolition waste were added to generate a reduction in the weight of the bricks due to to their properties. Similarly, rice husk ash is incorporated to maintain the resistance of the concrete bricks. Four dosages were designed (M0, M1, M2 and M3) with which the different concrete mixtures and bricks were prepared. Concrete control tests were carried out (settlement, temperature, and unit weight), additionally, hardened concrete tests were carried out (warping, absorption, dimensional variation, and weight of the units). In relation to the main objective of t...
11
artículo
Publicado 2020
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The objective of this work was to determine the effect of age and climate on the chemical composition of Cenchrus purpureus in degraded ecosystems of Cuba. An experiment was carried out in two well-defined periods: slightly rainy (January to April) and rainy (July to October). The treatments (regrowth ages: 30, 45, 60, 75, 90 105 days) were distributed in a randomized block design with four replicas. The structural constituents of the cell wall, minerals (calcium and phosphorus), and digestibility of dry and organic matter were determined. The neutral detergent fiber showed a behavior defined by the climatic season (72.37%) in rains and 69.67% in few rains). The elements of the climate showed a high relationship with the chemical composition and linear regression models were adjusted with high coefficients of determination, greater than 0.71 in the two periods evaluated; the rainfall and...
12
artículo
Publicado 2020
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The objective of this work was to determine the effect of age and climate on the chemical composition of Cenchrus purpureus in degraded ecosystems of Cuba. An experiment was carried out in two well-defined periods: slightly rainy (January to April) and rainy (July to October). The treatments (regrowth ages: 30, 45, 60, 75, 90 105 days) were distributed in a randomized block design with four replicas. The structural constituents of the cell wall, minerals (calcium and phosphorus), and digestibility of dry and organic matter were determined. The neutral detergent fiber showed a behavior defined by the climatic season (72.37%) in rains and 69.67% in few rains). The elements of the climate showed a high relationship with the chemical composition and linear regression models were adjusted with high coefficients of determination, greater than 0.71 in the two periods evaluated; the rainfall and...
13
tesis de grado
Publicado 2021
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El proyecto de suficiencia profesional cuyo objetivo es determinar de qué manera el reforzamiento con fibra de carbono (CFRP) en los elementos estructurales de la edificación de seis niveles, mejora el comportamiento de la estructura ante la presencia de un sismo, debido a que dichos elementos estructurales fueron construidos sin el control de calidad requerido para una edificación de tal envergadura, originalmente los elementos estructurales fueron diseñados y construidos para dos niveles, pero con el paso del tiempo se construyó cuatro niveles más sin asistencia técnica calificada, generando nuevas solicitaciones de la estructura y por ende los elementos estructurales están fuera de diseño. En el proyecto de investigación se utilizó las indicaciones y formulas presentadas en la Norma Internacional ACI 440-2R17, en función a esta norma se desarrolló una hoja de cálculo la ...
14
tesis de grado
Publicado 2024
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Actualmente existen problemas de fisuración y bajo esfuerzo residual de pavimentos rígidos en zonas comerciales. El presente proyecto busca combinar el aporte de las propiedades mecánicas de las fibras recicladas provenientes de perfiles de drywall en desuso con el concreto con el objetivo de mejorar los esfuerzos a flexión y esfuerzo residual sin afectar los esfuerzos a compresión de pavimentos rígidos enfocados en zonas comerciales que presentan problemas de fisuración. Se ensayarán probetas prismáticas y cilíndricas con dosificaciones de 0.5%, 1% y 1.5% con respecto al peso del concreto. Respecto del esfuerzo residual máximo con dosificaciones de 1.5% de adición de fibras para deflexiones de 3 mm se obtuvo un valor 3.69 MPa. El esfuerzo máximo obtenido se encuentra en el orden de 5.20 MPa a 5.34 MPa. La resistencia a la compresión incrementó con adiciones de 1.5% de fib...
15
tesis de grado
Publicado 2021
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El uso del concreto a medida que transcurren los años ha cobrado una gran demanda en la construcción civil para la realización de proyectos estructurales e influye el costo, tiempo, resistencia y propiedades física, química y mecánicas, esto es debido a su facilidad de aplicación y alcance de sus elementos para el diseño; existe aún cierta incertidumbre y desconocimiento acerca de los muchos componentes y propiedades del concreto. Por lo tanto, en el presente proyecto Influencia de la Incorporación de fibra de Tereftalato de Polietileno reciclado tiene como objetivo analizar y determinar la resistencia del concreto, sometidos a cargas de compresión, flexión y reportar los resultados obtenidos a través de métodos de diseños, ensayos y la aplicación de conocimientos teóricos, para la realización de la investigación. Finalmente se obtiene el concreto ya incorporado las fi...
16
tesis de grado
Publicado 2025
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En el presente trabajo de investigación denominado “Influencia en las características mecánicas de un concreto ecológico de =210 / con adición de 2.5%, 5.0% y 7.5% de fibras PET recicladas en Lima-Perú” se propuso la aplicación de uno de los materiales más utilizados y reciclados en la industria de la construcción, el cual contribuye a las edificaciones sostenibles debido a sus beneficios ambientales. Entre las aplicaciones de estos materiales destaca el Tereftalato de Polietileno o PET reciclado, del cual genera contaminación por acumulación y degradación lenta debido a que no se realiza una adecuada disposición final de estos. Asimismo, se evaluaron las propiedades mecánicas de un concreto con adiciones de fibras PET recicladas en dosificaciones de 2.5%, 5.0% y 7.5% por medio de ensayos en concreto fresco y endurecido con 7, 14 y 28 días de curado. Los resultados obt...
17
artículo
Experimental and analytical bond behaviour of masonry strengthened with steel reinforced grout (SRG)
Publicado 2020
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Steel Reinforced Grout (SRG) is gaining popularity as a retrofitting system for structural elements due to advantages such as its effectiveness and ease of installation. The good performance of SRG system has turned out to be substantially dependent on the behaviour of the bond between the composite layer and the substrate. This paper presents an experimental study of the bond behaviour of Peruvian masonry strengthened with SRG, along with a characterization of the materials by means of direct tensile tests on the fiber and compression tests on the mortar. The criteria of the sample's geometry, construction and test procedure are discussed for each trial since up to now there has been a gap in the standards that control them. In addition, an analytical model is employed in order to obtain design bond parameters to define a Cohesive Material Law (CML). The strain profile, slip profile, fo...
18
tesis de grado
Publicado 2019
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La presente tesis tiene como objeto el diseño estructural de un Estacionamiento Subterráneo de Concreto Reforzado con barras de GFRP, con dos sótanos y un parque sobre la estructura, ubicado en La Plazuela Gonzales Prada (Ex-Malvinas), en el Distrito de Trujillo y Provincia de Trujillo departamento La Libertad, así mismo dar a conocer los procedimientos de diseño con GFRP con la Norma ACI 440.1R, y escrutar su factibilidad en el diseño de los elementos de los diferentes elementos estructurales teniendo como refuerzo las barras de “Polímero Reforzado con Fibra de Vidrio”; consecuentemente desarrollar las hojas de cálculo para el diseño estructural utilizando las barras de GFRP. El diseño estructural ha sido desarrollado a partir de un diseño arquitectónico realizado en un área 50 m x 49m (2450m2 aprox.); sobre un suelo de perfil tipo S2 (capacidad portante de 3.43 kg/c3)....
19
tesis de grado
Publicado 2022
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El presente informe de tesis fue una investigación de tipo exploratoria, donde se realizó el estudio de 3 muros de concreto armado: un muro regular, un muro irregular tipo L y uno muro irregular tipo C, analizando 3 viviendas multifamiliares, que oscilan entre los entre los 6 y 9 niveles, diseñando cada uno de los elementos que forman los muros estudiados, con el objetivo de obtener criterios y lineamientos mínimos para el diseño de muros irregulares de concreto armado. Para ello, se usó el programa estructural de edificaciones Etabs 2019, con el cual modelamos las estructuras y verificamos que los resultados del análisis estructural, sísmico estático, sísmico dinámico y modal, cumplan con lo establecido en nuestro RNE, verificando que la relación Demanda – Capacidad fue menor a 1 en cada muro a Flexocompresión y por Cortante - Capacidad. Adicionalmente a esto, se diseñó...
20
tesis de grado
Publicado 2024
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El presente trabajo de investigación titulado “EVALUACIÓN DEL DESEMPEÑO SÍSMICO DE UN PABELLÓN DE 3 NIVELES EN LA I.E MIGUEL GRAU SEMINARIO DEL C.P EL PORVENIR DISTRITO DE QUERECOTILLO, PROVINCIA DE SULLANA, DEPARTAMENTO DE PIURA”, tiene como objetivo evaluar el desempeño sísmico de un pabellón escolar tipo 780 para generar una mejor comprensión sobre el comportamiento sísmico de este tipo de módulos, ya que se observaron deficiencias en el informe técnico con respecto a la especialidad de estructuras los cuales tienen que ver en mayor parte al diseño y sistema estructural de la edificación propuesta inicialmente. Este tipo de módulos clásicos en infraestructuras educativas a lo largo de los años han mejorado en cuanto a su diseño y análisis estructural logrando resolver la mayoría de problemas que pueda presentar la infraestructura ante distintos eventos sísmico...
