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29th Annual Conference of the International Group for Lean construction, IGLC 2021

作者： Hamerski, Douglas Comassetto de Araujo Fernandes, Luara Lopes Porto, Mattheus Souza Saurin, Tarcisio Abreu Formoso, Carlos Torres Costa, Dayana Bastos Postgraduate Program in Civil Eng.: Construction and Infrastructure Federal University of Rio Grande do Sul Porto Alegre Brazil Postgraduate Program in Civil Engineering Federal University of Bahia Salvador Brazil Industrial Engineering and Transportation Department Federal University of Rio Grande do Sul Brazil School of Engineering Department of Structural and Construction Engineering Federal University of Bahia Salvador Brazil

ISBN: (纸本)9786124802546

The Last Planner® System (LPS) of Production Control is widely acknowledged as fit to tackle the complexity of construction projects. However, the implications of complexity in the implementation of LPS itself have not been investigated. Those implications are investigated in this paper by exploring the gap between production planning and control-as-imagined and as-done at the look-ahead level. For that purpose, a case study was conducted in the refurbishment of a department store in which the LPS was implemented. Data collection involved document analysis, participant observation at the look-ahead and short-term planning meetings, and unstructured interviews. The Functional Resonance Analysis Method (FRAM) was used for modeling variability and interactions between the managerial functions at the look-ahead planning level. Results indicated several differences between production planning and control-as-imagined and as-done, which reflect hidden activities required for the removal of constraints. These activities took time and effort from managers and therefore they can partly explain why the LPS was not strictly followed as-imagined in theory. © Prof. Luis F. Alarcón and Assoc. Prof. Vicente González, IGL2021 All rights reserved.

关键词： Planning

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Assessing Self-Healing in High-Strength Concrete with Superabsorbent Polymers by an Innovative Methodology

SSRN

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SSRN 2023年

作者： Santos, Karyne Ferreira Ribeiro, António Simões Bettencourt Silva, Eugênia Fonseca Postgraduate program in Structural Engineering and Construction - PECC Department of Civil and Environmental Engineering SG-12 Building University of Brasilia - UnB DF Brasília Brazil National Laboratory for Civil Engineering LNEC Portugal

This study introduces a novel cracking methodology used in high-strength concrete (HSC) with superabsorbent polymers (SAP) to unveil its actual self-healing potential without fibre reinforcement. Although high-strength concrete allows for more creative structural designs and reduces the amount of building materials used, it often suffers from self-desiccation, which can cause cracking issues. SAP's inclusion in HSC not only addresses the autogenous shrinkage problem but also enhances concrete's self-healing capabilities. This research focuses on the dual role of SAP in mitigating autogenous shrinkage and promoting self-healing in high-strength concrete. An innovative technique was employed to induce uniform, controlled cracks under direct tension by isolating the self-healing agent's effect. The cracking process was developed using nonlinear finite element analysis. Two SAP concentrations (0.3% and 0.6%) were tested on specimens with a consistent crack width of 200 µm. These specimens underwent daily wetting-drying cycles over four months, with evaluations at 7 and 28 days post-cracking. Self-healing effectiveness was measured through mechanical recovery and microscopic examination of crack closure. Results, as expected, revealed a modest healing level but showed the actual potential of self-healing that this kind of concrete (HSC) can be counted on, offering crucial insights into self-healing concrete's practical applications and limitations. This study demonstrates SAP's versatility and highlights another advantage of SAP in high-strength concrete. This advantage, while slight, encourages the use of SAP in concrete and advances the creation of more durable construction materials. © 2023, The Authors. All rights reserved.

关键词： Crack closure

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Chemical and Mechanical Characterization of Ternary Cement Pastes Containing Calcined Clay and Nanosilica

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Journal of Civil engineering and Architecture 2021年第7期15卷 360-369页

作者： Divino Gabriel Lima Pinheiro Matheus Ian de Castro Sousa João Henrique da Silva Rêgo Postgraduate Program in Structure and Civil Construction PPG-PECC Universidade de BrasíliaFederal DistrictBrazil Federal Institute of Education Science and Technology of GoiásCâmpus FormosaGoiásBrazil Department of Civil and Environmental Engineering Universidade de BrasíliaFederal DistrictBrazil

Research regarding new SCMs(supplementary cementitious materials)is in constant progress,aiming to improve cement properties,reduce its operational costs and make it more *** such material is calcined clay,which reduces CO2 emissions and overall cost when blended with *** is also an SCM,highly *** the benefits of both are well established,their combined effect in a ternary mixture with cement still demands more ***,the present work evaluates that mixture,aiming to contribute to the cement industry and environmental *** cement pastes were studied:OPC(100%Portland cement),2NS(2%substitution by nanosilica),25CC(25%replacement by calcined clay produced in the laboratory)and 23CC2NS(replacement by 2%of nanosilica and 23%calcined clay).w/b(water/binder)ratio was fixed in 0.35 and superplasticizer admixtures were used to keep the same ***(compressive strength),XRD(X-ray diffraction)and TGA(thermogravimetric analysis)were performed in the *** show that the calcination process of the raw clays was efficient,with conversion of kaolinite and that both binary and ternary pastes showed fc equal to or higher than the reference,demonstrating the viability of the calcined clay for clinker substitution at high contents.

关键词： Calcined clay nanosilica SCM blended cements sustainability low CO2 cements

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Bearing failure analysis in the design of bolted connections with austenitic stainless steel

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ce/papers 2023年第3-4期6卷 1350-1355页

作者： Sobrinho, Kelvin de P. da Silva, André T. Rodrigues, Monique C. PGECIV - Civil Engineering PostGraduate 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 use of stainless steel in structures has been improved;nevertheless, the application of this material is not considered trivial by most designers, as there as still limited design codes providing specific rules. Current codes provide conservative approaches in certain cases, which do not corroborate with the objective of reducing the initial cost of projects incorporating stainless steel. In order to contribute to an adequate comprehension about the structural behavior of austenitic steel in bolted connections, a study was conducted regarding the influence of geometric parameters on the connections with a bolt under two shear planes, encompassing the evaluation of the phenomenon recognized as curling. Concerning to conclusions, it was observed that the geometric parameters e1, e2, d0, affects the curling effects, which has the potential to compromise the structural behavior of a thin-plate connection if this deformation is greater than the thickness of the plate. Furthermore, the results provided by the equations employed in the design codes was assessed in this study, revealing an adequate prediction of the SCI in terms of the failure mode. However, both the manual and current codes exhibited conservative load for the investigated connections. © 2023 Ernst & Sohn GmbH.

关键词： Austenitic stainless steel

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AN EVALUATION OF HY‐80 STEEL. AS A structural MATERIAL FOR SUBMARINES. PART II

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Naval Engineers Journal 1965年第2期77卷 193-200页

作者： HELLER, S.R. FIORITI, IVO VASTA, JOHN Captain Heller an Engineering Duty Officer of the United States Navy received his undergraduate education at the University of Michigan in Naval Architecture and Marine Engineering and in Mathematics. Following typical shipyard duty during World War II he received postgraduate instruction at the Massachusetts Institute of Technology leading to the degrees of Naval Engineer and Doctor of Science in Naval Architecture. Since then he has had design responsibilities in the Bureau of Ships had a maintenance assignment with the Fleet directed structural research at the David Taylor Model Basin engaged in submarine design and construction at Portsmouth Naval Shipyard and is now Head of Hull Design in the Bureau of Ships. Captain Heller is a member of ASNE SNAME Tau Beta Pi and Sigma Xi. Mr. Fioriti is the Materials Engineer in the Hull Scientific and Research Section Bureau of Ships with responsibility for materials and fabrication processes that are used in the construction of ship hulls. Mr. Fioriti attended the University of Pittsburgh receiving the Bachelor of Science degree in Metallurgical Engineering in 1951. He took postgraduate work at the University of Maryland receiving the Master of Science degree in 1960. From 1951 to 1956 he worked in the Metals and Metallurgy Section of the Bureau of Ships where he planned and administered research programs on metals for ships. He was associated intimately with the development of HY-80 steel and prepared the first specification used for its procurement by the Navy. In addition he was responsible for the development of dimpled armor plate for aircraft carrier flight decks. In 1956 he assumed his present position where he has been active in the Ship Structure Committee research program the low cycle fatigue structural program and the hydrofoil materials research program. Mr. Vasta is Head of Hull Scientific and Research Section Bureau of Ships with the responsibility for planning initiating and technically monitoring research in the fields of structural me

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Materials for hydrofoils

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Naval Engineers Journal 1963年第N 3期v 75卷 p609-622页

作者： Fioriti, I. Vasta, J. Starr, A. Mr. Fioriti is the Materials Engineer in the Hull Scientific and Research Section Bureau of Ships with responsibility for materials and fabrication processes that are used in the construction of ship hulls. Mr. Fioriti attended the University of Pittsburgh receiving the Bachelor of Science degree in Metallurgical Engineering in 1951. He took postgraduate work at the University of Maryland receiving the Master of Science degree in 1960. From 1951 to 1956 he worked in the Metals and Metallurgy Section of the Bureau of Ships where he planned and administered research programs on metals for ships. He was associated intimately with the development of HY-80 steel and prepared the first specification used for its procurement by the Navy. In addition he was responsible for the development of dimpled armor plate for aircraft carrier flight decks. In 1956 he assumed his present position where he has been active in the Ship Structure Committee research program the low cycle fatigue structural program and the hydrofoil materials research program. Mr. Vasta is the Head of Hull Scientific and Research Section Bureau of Ships with responsibility for planning initiating and technically monitoring research in the fields of structural mechanics and hydromechanics. Mr. Vasta attended New York University receiving the Bachelor of Science degree in Mechanical Engineering in 1930. He took postgraduate work at the Massachusetts Institute of Technology receiving the Master of Science degree in 1931. From 1931 to 1938 he worked at the United States Experimental Model Basin in the structural mechanics group. After a short duty at the Headquarters of the United States Coast Guard he joined in 1939 the staff of the United States Maritime Commission where he held various positions of responsibility in the Technical Division. He was associated intimately with the design development of the reinforced concrete ship program first as Assistant Chief and then as the Chief of the Section. Thereafter he was appointed Assistant Chief of

Research program of U S Bureau of Ships is in final phase;literature survey and screening phases are completed;on basis of tests, fabrication studies and cost analyses most promising materials are steels 4330M and 17-4PH (H1025) with protective coatings, and 2 titanium alloys (8AL-2CB-1TA) and (6AL-4V);most promising coatings are polyurethane rubber and neoprene rubber base coatings;coated HY-100 steel is satisfactory for low performance foils;glass laminates are of particular interest as foil materials and are under study;no "off shelf" material is ideal for high speed foils.

关键词： Hydrofoils

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Comparative Heave Dynamics Of Two Unusual Ship Configurations For Recovery Of Submersibles

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Naval Engineers Journal 1971年第5期83卷 30-36页

作者： MOTHERWAY, D.L. HELLER, S.R. D. L. Motherway received his Bachelor of Science Degree in Mechanical Engineering from the University of Rhode Island in June 1961. He was subsequently employed at General Dynamics/Electric Boat Division Groton Connecticut where he held positions in their Planning Department as a planning engineer for FBM Submarine Construction and in the Mechanical Division as a design engineer. Motherway went to the Naval Ship Engineering Center Washington D. C. in March of 1966 with the Submarine Hydraulics Section of the Hull Design Branch where he participated in the design of submarine hydraulic systems. He later transferred to the Ocean Engineering Section of the Deck Systems Branch where he participated in design related to deep submergence vehicles and ocean salvage and retrieval systems. During this period at NavSEC he received his Master Science Degree in Mechanical Engineering from the Catholic University of America Washington D. C. From April 1970 to May 1971 he was with the Undersea Long-Range Missile System (ULMS) Submarine Design Development Office in the capacity of Assistant Subsystem Design Director. Currently he is the Senior Project Engineer for the ULMS program at the office of the Supervisor of Shipbuilding Conversion and Repair Groton Connecticut. He is a member of ASNE and ASE. S. R. Heller Jr. a retired Engineering Duty Officer of the United States Navy received his undergraduate education at the University of Michigan in Naval Architecture and Marine Engineering and in Mathematics. Following typical shipyard duty during World War II he received postgraduate instruction at the Massachusetts Institute of Technology leading to the degrees of Naval Engineer and Doctor of Science in Naval Architecture. Since then he has had design responsibilities in the Bureau of Ships had a maintenance assignment with the Fleet directed structural research at the David Taylor Model Basin engaged in submarine design and construction at Portsmouth Naval Shipyard and was the last Head of Hull Design in the

The comparative heaving characteristics of two unusual ship configurations, a spar‐type ship similar to FLIP and a catamaran which employs a submerged cradle suspended by sophisticated motion attenuation devices, for recovery of small submersibles are presented. The two ships are described and their heaving characteristics are determined analytically using classical vibration theory. © 1971 American Society of Naval Engineers

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