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Articles by Krishanu Roy
As storms become more extreme, it’s time to rethink how we design roofs
As extreme wind events are becoming more intense across New Zealand and the Pacific, roofs are often the first point of failure. But they remain one of the most overlooked elements in discussions about resilience and safety. Storm systems such as Cyclone Gabrielle and tropical Cyclone Tam have caused widespread damage. But it’s not only cyclones we should worry about. Increasingly, non-cyclonic wind storms are revealing deep-rooted vulnerabilities in our built environment, particularly in our roofs.
Investigation of cold formed steel angle compression through high throughput design FEA and machine learning - Scientific Reports
Abstract This research investigates the finite element analysis (FEA) of cold-formed steel (CFS) L-columns with pin-ended supports under compression. The study involves a comprehensive parametric analysis with 110 FE models to assess the effects of section thickness and material yield stress on the axial strength of CFS L- columns. On the basis of the findings from this parametric study, a new design equation for determining the compression strength of CFS L- columns was proposed.
Celebrate Every Achievement with Personalized Trophies and Awards
When you hear the word trophy, you might immediately picture championship games, red carpet events, or corporate galas. But who says trophies are only for the pros? In reality, some of the most meaningful wins happen in everyday life — and they’re just as deserving of recognition. At Trophy Deals, we believe that a trophy doesn’t have to be reserved for major milestones.
Life Cycle Assessment of a Structural Insulated Panel Modular House in New Zealand
1. Introduction Recent studies in the building and construction (B&C) sector highlight the increasing significance of sustainable housing trends. Incorporating sustainable practices into affordable housing can enhance energy efficiency, minimise resource waste, and create healthier living spaces [1]. The B&C sector accounts for 37% of global carbon emissions [2] and contributes 20% of New Zealand’s total carbon emissions [3].
Investigation on Flexural Behavior of Galvanized Cold-Formed Steel Beams Exposed to Fire with Different Stiffener Configurations
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
Flexural Behavior of Galvanized Iron Based Cold-Formed Steel Back-to-Back Built-Up Beams at Elevated Temperatures
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
Appraising the Feasibility of 3D Printing Construction in New Zealand Housing
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
Editorial for the Special Issue on Sustainable Composite Construction Materials
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
A Comparative Study on Crack Detection in Concrete Walls Using Transfer Learning Techniques
4.2. Comparison on VGG16, ResNet50, MobileNet and Xception Architectures The second comparison was made on the VGG16, ResNet50, MobileNet, and Xception architectures. The hyper-parameter details are the same as those mentioned in Table 2. A classification matrix is used to evaluate the models. For a balanced dataset, accuracy can be a good measure. Still, in the case of imbalanced datasets, precision, recall, and F1 measures need to be validated to measure the performance of the models.
'Build back better' requires a framework that focuses on the full life of a house - from materials to its end of life
In the wake of Cyclone Gabrielle, New Zealand is again talking about “building back better”. But how do we build back better when we don’t necessarily understand what “better” means? Or how to achieve this across a country with significantly different risk profiles? At its most basic level, build back better is an opportunity to rebuild homes and other buildings in a way that is responsive to future risks and sustainability needs.
'Build back better' requires a framework that focuses on the full life of a house-from materials to its end of life Original
In the wake of Cyclone Gabrielle, New Zealand is again talking about "building back better". But how do we build back better when we don't necessarily understand what "better" means? Or how to achieve this across a country with significantly different risk profiles? At its most basic level, build back better is an opportunity to rebuild homes and other buildings in a way that is responsive to future risks and sustainability needs.
'Build back better' requires a framework that focuses on the full life of a house - from materials to its end of life
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'Build back better' requires a framework that focuses on the full life of a house – from materials to its end of life
In the wake of Cyclone Gabrielle, New Zealand is again talking about “building back better”. But how do we build back better when we don’t necessarily understand what “better” means? Or how to achieve this across a country with significantly different risk profiles? At its most basic level, build back better is an opportunity to rebuild homes and other buildings in a way that is responsive to future risks and sustainability needs.
'Build back better' requires a framework that focuses on the full life of a house - from materials to its end of life
In the wake of Cyclone Gabrielle, New Zealand is again talking about “building back better”. But how do we build back better when we don’t necessarily understand what “better” means? Or how to achieve this across a country with significantly different risk profiles? At its most basic level, build back better is an opportunity to rebuild homes and other buildings in a way that is responsive to future risks and sustainability needs.
Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
1. Introduction Cold-formed steel (CFS) sections are becoming popular for low- to medium-rise construction due to their lower cost and lighter weight [1,2,3]. In the construction industry, sustainable materials are in high demand.
Influence of Nano Composites on the Impact Resistance of Concrete at Elevated Temperatures
Abstract : The addition of nanomaterials to concrete efficiently fills the pores of the concrete, thereby improving its hardening characteristics. However, no research is available in the literature that investigated the influence of nano-cement (NC), nano-silica-fume (NS), nano-fly-ash (NF), and nano-metakaolin (NM), which are used as partial replacements for cement, on the impact strength (IS) of concrete at elevated temperatures. This issue is addressed herein.
Experimental Investigation on Flexural Behaviour of Sustainable Reinforced Concrete Beam with a Smart Mortar Layer
Open AccessArticle by Ramkumar Durairaj 1, Thirumurugan Varatharajan 2,*, Satyanarayanan Kachabeswara Srinivasan 2, Beulah Gnana Ananthi Gurupatham 3 and Krishanu Roy 4,* 1 Research Scholar, Department of Civil Engineering, SRMIST, Kattankulathur 603203, India 2 Department of Civil Engineering, SRMIST, Kattankulathur 603203, India 3 Department of Civil Engineering, College of Engineering Guindy Campus, Anna University, Chennai 600025, India 4 School of Engineering, The University of Waikato,...
Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by M. K.
LCA case study of stand-alone houses
Light timber framing (LTF) is the most common prefabricated building technology for stand-alone residential dwellings in Aotearoa New Zealand, but the country is currently experiencing a shortage of building materials due to the pandemic. Alternative framing materials such as cold-formed steel (CFS) or light-gauge steel have the potential to keep the industry afloat.
Buildings | Free Full-Text | Structural Performance of Cold-Formed Steel Face-to-Face Built-Up Channel Sections under Axial Compression at High Temperatures through Finite Element Modelling
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Yecheng Dai 1, Krishanu Roy 2,*, Zhiyuan Fang 1,2, Gary M. Raftery 1 and James B. P. Lim 1,2 1 Department of Civil and Environmental Engineering, The University of Auckland, Auckland 1023, New Zealand 2 School of Engineering, The University of Waikato, Hamilton 3216, New Zealand * Author to whom correspondence should be addressed.
End-One-Flange Web Crippling Behavior of Cold-Formed High-Strength Steel Channels with Web Holes at Elevated Temperatures
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Zhiyuan Fang 1,2, Krishanu Roy 1,*, Dinesh Lakshmanan Chandramohan 1, Amirmohammad Yousefi 3, Yazeed Al-Radhi 2 and James B. P.
A State of the Art Review of Fillet Welded Joints
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessReview by Dinesh Lakshmanan Chandramohan 1, Krishanu Roy 1,*, Hafez Taheri 2, Michail Karpenko 2, Zhiyuan Fang 1,3,* and James B. P.
Influence of Steel Fiber and Carbon Fiber Mesh on Plastic Hinge Length of RCC Beams under Monotonic Loading
1. Introduction The strengthening and restoration of existing structures is a hot issue these days, attracting the attention of both researchers and engineers. The possibilities presented by new materials and technologies ideal for granting the best performance of existing structures have given a new pulse to the research of matrix composites such as fiber-reinforced polymers (FRP) and fiber-reinforced concrete (FRC) in this context.
Shear Capacity of Cold-Formed Steel Channels with Edge-Stiffened Web Holes, Unstiffened Web Holes, and Plain Webs
Downloaded 0 times Technical Papers Abstract In this paper, a total of 254 results comprising 30 shear tests and 224 finite element (FE) analysis results are reported. Simply supported test specimens of cold-formed steel (CFS) channels with aspect ratios of 1.0 and 1.5 were tested. For comparison, specimens with unstiffened web holes and plain webs were also tested. A nonlinear elastoplastic FE model was then developed and validated against the experimental results.
Axial Capacity of Back-to-Back Built-Up Aluminum Alloy Channel Section Columns
Downloaded 0 times Technical Papers Abstract An experimental investigation of 12 screw-fastened back-to-back built-up aluminum alloy slender columns under axial compression is presented, complemented by a numerical finite element study comprising 246 results. Using a laser scanner, the geometric imperfections were measured. In the numerical study, the effect of the modified slenderness, number of screws, and section thickness were investigated.
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