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9th International Conference on Advances in Steel Structures, ICASS 2018

作者： Mendes, Flávio F. de Lima, Luciano R.O. da Vellasco, Pedro C. G. S. Rodrigues, Monique C. Neves, Luis F.C. PGECIV - Civil Engineering Post-Graduate Program UERJ - State University of Rio de Janeiro Brazil Structural Engineering Department UERJ - State University of Rio de Janeiro Brazil INESCC Civil Engineering Department University of Coimbra Portugal

ISBN: (纸本)9889914093

Extensive work has been performed to address the technological and design issues of tubular joints in the last decades. Several international design codes and recommendations explicitly cover the design of tubular joints such as Eurocode 3, ISO14346 and NBR16239. Experimental results on the influence of the chord stresses over the brace load capacity have been published in the literature. These results showed that compressive chord stresses considerably reduce the joint resistance. However, very few studies indicated the same reduction in load carrying capacity for joints under the action of chord tensile forces. To investigate this influence, an experimental program comprising thirteen tests was carried out, i.e. tests without chord axial forces;tests with compressive chord forces;and other ones with tensile chord forces. The obtained results were compared to the design provisions. This assessment indicated that the results obtained for chords without axial forces and with compressive forces, in experiments were safe when compared to the values predicted by all the investigated standards. On the other hand, the results associated with cases with chord tension forces proved to be conservative. Copyright © 2018 by The Hong Kong Institute of Steel Construction.

关键词： Software testing

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The effect of reinforcement ratio of hibiscus skin with a resin coating on lightweight concrete beam under bending

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AIP Conference Proceedings 2023年第1期2609卷

作者： Rahadian Bagiartha Ni Nyoman Kencanawati Suryawan Murtiadi Shofia Rawiana Suparjo 1Post Graduate Program of Civil Engineering Mataram University Mataram Indonesia 2Civil Engineering Department Mataram University Mataram Indonesia

The use of natural fibers as an alternative of reinforcement for the structure of light weight concrete beam is highly encouraging. The use of natural fiber was chosen because of its easy availability; easy to process, abundant in number, renewable, inexpensive, and relatively high tensile strength. Indeed, it is an environmentally friendly material. One of natural fiber is skin of hibiscus. Hence, the objective of this study is to investigate the effect of reinforcement ratio of hibiscus skin with a resin coating towards the flexural strength of light concrete beam. This study was conducted at Laboratory Structures and Materials, Mataram University. The dimensions of concrete beams were 15× 20× 150 cm and the variation of tensile reinforcement from hibiscus skin were 3, 6, and 8 with a diameter of 12 mm. In addition, the ratio of reinforcement was 0,014; 0,031; and 0,046. The yield strength of hibiscus skin with a resin coating in tension was 43,67 MPa. Furthermore, the largest ultimate load (Pu) for the ratio reinforcement of 0,014; 0,031; and 0,046 were 7,564 kN, 12,811 kN, and 14,19 kN respectively. Meanwhile, the ultimate moments (Mu) were 2,125 kNm, 3,125 kNm and 3,625 kNm for for the ratio reinforcement of 0,014; 0,031; and 0,046 respectively. Therefore, the greater the ratio of the reinforcement results the higher of the load resistance. Thus, the hibiscus reinforcement has the ability to increase the beam resistance against the flexural load.

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Experimental evaluation of composite tubular columns CFDST (Stainless steel-concrete-carbon steel) 9

Experimental evaluation of composite tubular columns CFDST (...

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9th International Conference on Advances in Steel Structures, ICASS 2018

作者： Rodrigues, Pedro F. da Vellasco, Pedro C. G. S. de Lima, Luciano R.O. da Silva, André T. Rodrigues, Monique C. Sarmanho, Arlene M.C. Civil Engineering Post-Graduate Program State University of Rio de Janeiro UERJ Rio de Janeiro Brazil Structural Engineering Department State University of Rio de Janeiro UERJ Brazil Civil Engineering Department Federal University of Ouro Preto UFOP Brazil

ISBN: (纸本)9889914093

This paper is centred on the structural response of double skin composite columns made of two concentric tubes of stainless and carbon steels filled with concrete. These structural solutions can be used in new structures or even in cases where a reinforcement or retrofit is required to enhance their corrosion resistances or structural capacities. An experimental programme was conducted to investigate this innovative structural system by means of comparisons to standard concrete encased tubular steel stub columns. The experimental results widened their applications to cases where a high reserve of post-collapse resistance is required like in seismic design. An assessment of the Eurocode 4 predictions for these tubular columns indicated the design prediction formulae are too conservative, partly explained by the lack of consistent numerical and experimental results that could enable a better design calibration. Copyright © 2018 by The Hong Kong Institute of Steel Construction.

关键词： Tubular steel structures

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A Review of Netzero Energy Buildings in Brazil

SSRN

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SSRN 2023年

作者： Matana Júnior, Sidnei Frandoloso, Marcos Antonio Leite Brião, Vandré Barbosa Universidade de Passo Fundo Post-Graduate Program in Civil and Environmental Engineering Campus I BR 285 km 292.7 B. Passo Fundo/RS São José99052-900 Brazil Campus I BR 285 km 292.7 B. Passo Fundo/RS São José99052-900 Brazil

Buildings are relevant electricity consumers, and projections of increased demand until 2040, leading to the necessary actions aimed at energy efficiency, consumption reduction, and the transition to a renewable energy matrix. The 2030 Agenda addresses these subjects, and this context is inserted in the concept of Netzero Energy Buildings (NZEB). The concept combines consumption reduction and its compensation with renewable energy. The main objective of this present study is to establish an overview of NZEB in Brazil and to identify the strategies adopted by these buildings. A survey of strategies was carried out based on the buildings certified by the Green Building Council Brazil, available on the companies, designers, and contractors’ websites. In Brazil, there are 75 buildings in the certification process, and 21 have already proven their self-sufficiency, evidencing the use of solutions to reduce consumption, such as lighting and efficient equipment and passive architecture strategies. The research has identified the photovoltaic solar energy predominance as a strategy for NZEB. Brazil presents a favorable scenario for the NZEBs expansion due to climatic characteristics and public policies that contribute to meeting the Sustainable Development Goal 7, objectives scenario that is sub-exploited nowadays. © 2023, The Authors. All rights reserved.

关键词： Energy efficiency

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Evaluating sustainable efficiency: A study on transportation systems in South America using data envelopment analysis

Latin American Transport Studies

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Latin American Transport Studies 2024年 2卷

作者： Hélio da Silva Queiroz Júnior Marcos Araújo de Souza Celestino Viviane Adriano Falcão Francisco Gildemir Ferreira da Silva Maurício de Oliveira Andrade Anísio Brasileiro Department of Civil Engineering Civil Engineering Post-Graduation Program Federal University of Pernambuco Recife Pernambuco 50670-420 Brazil Economy Graduate Program (Caen/UFC) Federal University of Ceará - UFC Fortaleza Ceará 60020-181 Brazil Graduate Program in Transport (PPGT/UnB) University of Brasilia Brasília DF 70.919-970 Brazil

The transport sector is pivotal in fostering economic growth and environmental sustainability. Extensive research has scrutinized various transportation modes individually, yet a holistic assessment encompassing all modes while considering CO2 emissions needs to be more conspicuously present. Our study employs Data Envelopment Analysis (DEA) to evaluate the efficacy of transportation policies in South American nations in the context of United Nations-established sustainable development goals. Our overarching objective is to classify the sustainability status of South American countries' transport sectors and to establish benchmark models rooted in the six dimensions of sustainability. Methodologically, our analysis integrates operational transportation metrics, Gross Domestic Product per capita, Human Development Index, and CO2 emissions from transportation systems. Additionally, we draw comparative insights by juxtaposing South American countries against the G8 and BRICS nations. The rigorous application of DEA coupled with bootstrap validation fortifies the reliability of our findings. Our results bring to light these findings, positioning South American countries closer to their developed counterparts. Notably, the sustainable development models of Chile and Uruguay emerge as prominent exemplars. This study underscores the pressing demand for holistic and integrated development strategies to attain more sustainable outcomes across South American nations in a faster way. In conclusion, our research fills a conspicuous void in the extant literature by furnishing a comprehensive evaluation of transportation policy performance in South America. Based on a robust methodology, this empirical evidence offers valuable insights for policymakers striving to advance sustainable regional development.

关键词： Sustainable Efficiency South America Transportation Emissions CO2 Data Envelopment Analysis

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Numerical assessment of stainless steel tubular T-joints subjected to brace and chord axial forces

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ce/papers 2021年第2-4期4卷 2495-2503页

作者： Nogueira, Mateus M. de Lima, Luciano R. O. da S. Vellasco, Pedro C. G. Young, Ben PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hong Kong

The utilisation of tubular sections in steel structures has increased significantly worldwide. The use of stainless steel provides several benefits for structures, including high corrosion resistance, durability, fire resistance and ease of maintenance. A significant issue in the design of tubular structures is the joints failure since they are highly susceptible to local failures that influence their actual overall behavior. The design rules of welded carbon steel tubular joints are available, such as Eurocode 3, part 1-8, NBR 16239, ISO 14346 and CIDECT guides. When stainless steel tubular joints are considered, the AS/NZS 4673 Australian/New Zealand Standard is the only available specification that can be used. An experimental and numerical analysis of these tubular joints are recommended since they enable a more accurate evaluation of their structural performance. Concerning these aspects, this work aims to investigate stainless steel tubular T-joints fabricated by SHS and RHS cold-formed profiles that focused on the effect of chord pre-loading. For this purpose, a numerical study based on finite element analysis was performed. The finite element model was developed and calibrated against experiments. The results were subsequently compared with the aforementioned design predictions. © 2021 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Finite element method

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A System Dynamics Model of Sustainable Construction for High rise Residential Projects in Developing Countries: Case of Indonesia

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Open civil engineering Journal 2022年第1期16卷

作者： Sutantio, Aditya Anwar, Nadjadji Wiguna, I Putu Artama Suryani, Erma Post Graduate Program Civil Engineering Department Institut Teknologi Sepuluh Nopember Jalan Raya ITS Surabaya 60111 Indonesia Civil Engineering Department Institut Teknologi Sepuluh Nopember Jalan Raya ITS Surabaya 60111 Indonesia Information System Department Institut Teknologi Sepuluh Nopember Jalan Raya ITS Surabaya 60111 Indonesia

Introduction: Despite its contribution to urban development, high rise residential projects also cause adverse impact on the living environment. To address the problem, a sustainable construction as a new paradigm has been introduced. Various papers have examined the importance of sustainable construction. However, most studies focused on social and environmental aspects and with few consideration on the economic objective of the business. This study aimed to fill the research gap by presenting a dynamic model to improve social, environmental and economic performance of sustainable construction for high rise residential projects in developing countries. Methods: This study started with a literature review as a basis for a qualitative survey conducted in thirty high rise residential projects in Indonesia, to identify the influencing factors and the interrelationships. To analysis the data, a system dynamics approach was utilized. Results: The simulations reveal that the current regulation and construction practices are insufficient to reduce environmental negative impacts. In order to formulate better policies, three scenarios comprised the implementation of building energy regulation, tax incentives policy, and a policy mix were employed. The results show that the scenarios could improve construction sustainability performance in some extends. Conclusion: The combination of building regulation and tax incentives policy is effective to achieve environmental and social as well as economic aspects of sustainable construction which is suitable for investors. Based on the results, it is concluded that the model can be used to formulate various policies in the future to enhance sustainable construction of high rise residential projects in developing countries. © 2022 Sutantio et al.

关键词： Environmental impacts Lean construction Life cycle cost Regulation Sustainable construction System dynamics

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Experimental Assessment of Stainless and Carbon Steel Double-Skin Tubular Stub Columns Filled with Recycled Aggregate Concrete

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ce/papers 2021年第2-4期4卷 764-771页

作者： Castanheira, Deborah S. de Lima, Luciano R. O. Vellasco, Pedro C. G. da S. Cashell, Katherine A. Gardner, Leroy PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Department of Civil and Environmental Engineering Imperial College London London United Kingdom Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Department of Civil and Environmental Engineering Brunel University London United Kingdom

This paper presents an experimental study into the behaviour of concrete filled double skin tubular (CFDST) stub columns. A total of eight axial compression tests were carried out, half of which were filled with conventional concrete and the remainder had recycled aggregate concrete. The columns were circular in cross-section and comprised an austenitic stainless steel outer tube and a carbon steel inner tube, of varying dimensions. Accordingly, hollow ratios of 0.67 and 0.55 were considered. The recycled coarse aggregate was made by crushing test specimens from a previous research project. A replacement ratio of 50% was adopted in these tests. Both the natural coarse aggregates and the recycled aggregates had a maximum diameter of 9.5 mm. During the tests, similar structural behaviour and failure modes were observed between the columns with conventional and recycled aggregate concrete, and the faiure modes were identical. The experimental results are compared with available design procedures and it is ultimately shown that using recycled aggregate concrete rather than regular concrete in CFDST stub columns does not have a significant effect on the performance. © 2021 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Compression testing

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Numerical evaluation of tubular perfobond shear connectors

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ce/papers 2021年第2-4期4卷 666-674页

作者： Souza, Keila L. da Silva, André T. Henriques, José Vellasco, Pedro C. G. Rodrigues, Monique C. PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Construction Engineering Research Group IIW Faculty Hasselt University Belgium

Composite structures have been applied more frequently because they are an economical structural solution with excellent structural performance. The interaction is guaranteed with the use of elements that transfer the forces between these two materials. The most common mechanical connections between steel and concrete are made through shear connectors. Some of the connectors types used nowadays are stud bolt, U-profiles, Crestbond, Perfobond and T-Perfobond. Eurocode 4 prescribes that a connector has to possess a minimal ductility, one of the main requirements to shear connectors. The current Perfobond presents excellent resistant capacity, but low deformation capacity, contradicting what is prescribed by the code. This paper aims to study a Tubular Perforbond connector by analyzing the parameters that can influence its resistance and deformation capacity, applying FEM through Abaqus software, to simulate the composite structural, mechanical behaviour. When comparing the Tubular Perfobond connector with the Perfobond connector, it was possible to observe that the tubular connectors presented a substantial deformation capacity after peak load, while attending the connector ductility requirements. The use of Tubular connectors also decreased the concrete crushing propagation. © 2021 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Nonlinear analysis

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Influence of bearing coefficient in cold-formed stainless steel bolted connection

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ce/papers 2021年第2-4期4卷 148-155页

作者： Sobrinho, Kelvin da Silva, André T. Rodrigues, Monique C. Henriques, José A. Lima, Luciano R. da Vellasco, Pedro C. G. PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Construction Engineering Research Group IIW Faculty Hasselt University Belgium

The connections play an important role in the overall behaviour of the structures. Therefore an adequate structural design taking into account both safe and economic criterion is necessary. The structural design of stainless steel bolted connections using actual codes can provide inadequate design capacity mainly due to the use of similar rules based on analogies from mild carbon structures. Thus, the purpose of this paper is to evaluate the structural response of stainless bolted connections considering the steel grade austenitic 304. Experimental and numerical analyses have been carried out considering bolted connection under bearing failure. In details, the study cases were subjected to two shear planes with thin-plate and thick-plate. In these cases, the occurrence of curling failures is possible. A detailed study involving the geometric parameters adopted by design equations of bolted stainless steel connections was made. The outcomes showed a reduction of the ultimate capacity characterised by out-plane deformation. In addition, the current codes led to significant difference when compared to both experimental and numerical results. © 2021 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Structural design

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