Optimization of concrete stiffeners for confined brick masonry structures

Khan, Mehran; Ali, Majid

doi:10.1016/j.jobe.2020.101689

Cited by 16 publications

(7 citation statements)

References 30 publications

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“…In the preliminary stage, the numerical analysis plays an important role in the optimization of the design of the CCC. In general, the 3D solid mesh includes four kinds of meshes, such as prism, tetra, pyramid, and hexahedron [ 21 ]. The numbers of nodes for hexahedron, tetra, and pyramid, and hexahedron are 6, 4, and 5, respectively.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Epoxy-Based Rapid Mold with Profiled Conformal Cooling Channel

Kuo

Zhu

2022

Polymers

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Based on the experience of the foundry industry, reducing the demolding time is the key for mass production of wax patterns with sophisticated geometries. Integration of numerical simulation and rapid tooling technology for decreasing the time to market is essential in advanced manufacturing technology. However, characterization of epoxy-based rapid molds with a profiled conformal cooling channel (PCCC) using computer-aided engineering simulation of the epoxy-based rapid mold with PCCC was not found in the literature. In this study, epoxy-based rapid molds with PCCC were characterized numerically and experimentally. The cooling performance of wax injection molds with two different kinds of cross-sections of the cooling channel was investigated. Four pairs of injection molds with PCCC were implemented using four different kinds of material formulations. It was found that the cooling performance of the PCCC was better than a circular conformal cooling channel (CCCC) since the PCCC maintained a more uniform and steady cooling performance of injection-molded product than CCCC. Epoxy resin added with 41 vol.% Cu powder seems to be a cost-effective empirical material formulation in terms of cooling time and material costs. This empirical material formulation provided an injection mold with low material cost and good cooling performance simultaneously compared to an injection mold fabricated with commercial material. The cooling performance could reach 88% of that of the injection mold fabricated with commercial material. The material cost of making the injection mold was only about 60% of that of the injection mold fabricated with commercial material. The coolant flow rate had no significant effect on the cooling time, whereas the cooling time of the wax pattern was affected by coolant temperature significantly.

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Section: Resultsmentioning

confidence: 99%

Characterization of Epoxy-Based Rapid Mold with Profiled Conformal Cooling Channel

Kuo

Zhu

2022

Polymers

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“…In accordance with previous precedents and in recognition of the growing importance of industrialized construction techniques in enhancing efficiency and sustainability throughout a building's life cycle [22], the primary objective of this study is to analyze environmental and efficiency metrics to quantitatively demonstrate the benefits of using such techniques through a simplified LCA approach. Specifically, a case study will be conducted to compare a house that employs an MMC known as the "VAP system" with its conventional building counterpart that uses a traditional material such as bricks [23]. The significance and contributions of this study are outlined below:…”

Section: Introductionmentioning

confidence: 99%

Assessment of Sustainability and Efficiency Metrics in Modern Methods of Construction: A Case Study Using a Life Cycle Assessment Approach

2023

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The construction industry faces various sustainability challenges, and modern methods of construction (MMC) have been promoted as an effective alternative to mitigate environmental impact and improve productivity. However, to gain a thorough understanding of the benefits, there is a need for more objective data. To address this, the present study employs a simplified life-cycle assessment (LCA) methodology to evaluate a set of environmental and efficiency metrics in a case study. The study aims to demonstrate the benefits of using an MMC known as the “VAP system” by comparing it with its conventional counterpart built with reinforced masonry. Adopting the MMC resulted in significant reductions in embodied carbon (EC) and embodied energy (EE) related to materials, as well as a reduction in global warming potential (GWP), cumulative energy demand (CED), and construction waste. Additionally, it shortened delivery times and increased labor productivity. Furthermore, when both local and European parameters were considered in the evaluation, the percentage of materials circularity (PMC) was higher. The study concludes that the adoption of the MMC leads to higher sustainability by reducing carbon emissions, minimizing construction waste, and conserving resources. This research has significant implications for promoting the adoption of MMC globally, leading to more sustainable and efficient construction practices.

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“…The influence of adding fibers to a concrete mix depends on many factors, such as the fiber type, the fiber orientation in the mix, and the fiber geometry; the main factors are the fiber volume fraction (vf) and inclusion, and the properties of the fiber matrix (Savastano et al, 2006;Sudin and Swamy, 2006;Kuder and Shah, 2010;Cao and Khan, 2021). Fibers that can be used in a concrete mixture have many different types, and an effective fiber type is metallic fibers, such as carbon fibers or stainless-steel fibers, which have two shapes: hook-end fibers and corrugated fibers (Brandt, 1985;Kim and Park, 1994;Geng and Leung, 1996;Yurtseven, 2004;Ahmed et al, 2007;Perceka et al, 2019;Khan and Ali, 2020;Khan et al, 2021;Khan et al, 2022). The pullout behavior of steel fibers from concrete and the bond strength between steel fibers and concrete comprise complex problems; therefore, the shape of the fibers used is a very important factor to be considered when studying the behavior of high-strength fiber-reinforced concrete (HSFRC) beams subjected to two-point concentrated and monotonic loads.…”

Section: Introductionmentioning

confidence: 99%

Response of high-strength concrete beams with corrugated discrete steel fibers to small shear span-depth ratios

Alzara

Yosri

Yousef

et al. 2023

Front. Built Environ.

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The behavior of high-strength, fiber-reinforced concrete (HSFRC) beams under concentrated loads was affected by many different aspects, such as the type of fibers used and the volume percent of the fibers; nevertheless, the behavior was primarily affected by modifying the shear span-to-depth ratio (a/d). In this experimental investigation, the influence of a/d ratios (ranging from 1.5 to 2.2) is investigated on the response of twelve high-strength fiber-reinforced concrete (HSFRC) beams containing varying amounts of discontinuous steel fiber (vf) in the concrete mixture. The purpose of this study was to analyze the manner of failures of the tested beams and to identify a limiting a/d for effective beam depth. Shear failure was observed in high-strength concrete (HSRC) beams with a vf of 0% at a/d ratios as high as 2.2, according to the findings of the study. Altering either the a/d ratios or the vf had an effect on the way in which the HSFRC beams responded to the stimulus. Some of the HSFRC beams that were put through the shear–flexure test failed. In addition, the findings demonstrated that, as the a/d ratio increased up to 2.2, the beams with a vf of 0.5% and 0.75% broke in pure flexure with multi-cracking. This indicates that the a/d ratio has a substantial impact on the various failure behaviors of HSFRC beams.

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Optimization of concrete stiffeners for confined brick masonry structures

Cited by 16 publications

References 30 publications

Characterization of Epoxy-Based Rapid Mold with Profiled Conformal Cooling Channel

Characterization of Epoxy-Based Rapid Mold with Profiled Conformal Cooling Channel

Assessment of Sustainability and Efficiency Metrics in Modern Methods of Construction: A Case Study Using a Life Cycle Assessment Approach

Response of high-strength concrete beams with corrugated discrete steel fibers to small shear span-depth ratios

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