Behavior and Design of Post-Installed Rebar Connections under Temperature

2016 ◽  
Vol 711 ◽  
pp. 783-790 ◽  
Author(s):  
Giovanni Muciaccia ◽  
Andrea Consiglio ◽  
Gianpaolo Rosati
Keyword(s):  
Bond Strength ◽  
Safety Margin ◽  
Typical Case ◽  
Design Criteria ◽  
Bond Properties ◽  
Anchorage Length ◽  
Testing Conditions ◽  
Experimental Campaign ◽  
Eurocode 2

Typical applications for post-installed rebar connections consist in overlapping joints with existing reinforcement or anchoring of the reinforcement at a slab or beam support. At cold state it may be shown by testing that a post-installed rebar system can develop the same bond resistance with the same safety margin as cast-in-place rebar. Consequently, anchorage length and lap length for post-installed rebars can be calculated as for cast-in-place according to the Eurocode 2 provisions. However, when subjected to temperature, the decay in bond properties for post-installed systems is significantly more dramatic than for cast-in-place rebars. The paper presents the result of an experimental campaign carried out on a post-installed connection using a vinylester polymer, investigating the effects on the bond strength both of the temperature and of different testing conditions. Finally, design criteria are provided and applied to a typical case study consisting in a post-installed solid slab.

scholarly journals Stability charts based on the finite element method for underground cavities in soft carbonate rocks: validation through case-study applications

2019 ◽  
Vol 19 (10) ◽  
pp. 2079-2095 ◽  
Author(s):  
Michele Perrotti ◽  
Piernicola Lollino ◽  
Nunzio Luciano Fazio ◽  
Mario Parise
Keyword(s):  
Finite Element ◽  
Safety Margin ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Geometrical Features ◽  
Overall Stability ◽  
Underground Cavities ◽  
The Stability ◽  
Rock Mechanical Properties

Abstract. The stability of man-made underground cavities in soft rocks interacting with overlying structures and infrastructures represents a challenging problem to be faced. Based upon the results of a large number of parametric two-dimensional (2-D) finite-element analyses of ideal cases of underground cavities, accounting for the variability both cave geometrical features and rock mechanical properties, specific charts have been recently proposed in the literature to assess at a preliminary stage the stability of the cavities. The purpose of the present paper is to validate the efficacy of the stability charts through the application to several case studies of underground cavities, considering both quarries collapsed in the past and quarries still stable. The stability graphs proposed by Perrotti et al. (2018) can be useful to evaluate, in a preliminary way, a safety margin for cavities that have not reached failure and to detect indications of predisposition to local or general instability phenomena. Alternatively, for sinkholes that already occurred, the graphs may be useful in identifying the conditions that led to the collapse, highlighting the importance of some structural elements (as pillars and internal walls) on the overall stability of the quarry system.

The Use of Aluminium for Commercial Vehicle Structures—A Feasibility Study

1978 ◽  
Vol 192 (1) ◽  
pp. 81-92
Author(s):  
B. B. Hundy ◽  
S. Broadstock
Keyword(s):  
Structural Analysis ◽  
Aluminium Alloy ◽  
Feasibility Study ◽  
Commercial Vehicle ◽  
Load Capacity ◽  
Typical Case ◽  
Extra Cost ◽  
Manufacturing Processes ◽  
Structural Components

The use of aluminium alloy instead of steel for the structural components of a 32 ton articulated lorry has been examined. The probable manufacturing difficulties have been assessed and shown to be minimal. The savings in weight possible by using aluminium have been calculated from a structural analysis of the cab, tractor chassis and trailer and from this and an assessment of the manufacturing processes the extra cost of manufacturing in aluminium has been determined. A typical case study shows that this extra cost can be easily recovered by utilising the increased load capacity of the vehicle during the first few years of its life.

scholarly journals The International Children’s Digital Library: A Case Study in Designing for a Multilingual, Multicultural, Multigenerational Audience

2005 ◽  
Vol 24 (1) ◽  
pp. 4 ◽  
Author(s):  
Hilary Browne Hutchinson ◽  
Anne Rose ◽  
Benjamin B. Bederson ◽  
Ann Carlson Weeks ◽  
Allison Druin
Keyword(s):  
Children's Literature ◽  
Cultural Differences ◽  
Digital Library ◽  
Digital Libraries ◽  
Children’S Literature ◽  
Design Criteria

The challenges encountered in building the InternationalChildren’s Digital Library (ICDL), a freely availableonline library of children’s literature are described. Thesechallenges include selecting and processing books fromdifferent countries, handling and presenting multiplelanguages simultaneously, and addressing cultural differences. Unlike other digital libraries that present content from one or a few languages and cultures, and focuson either adult or child audiences, ICDL must serve amultilingual, multicultural, multigenerational audience.The research is presented as a case study for addressingthese design criteria; current solutions and plans forfuture work are described.

scholarly journals Persepsi Pengunjung Terhadap Kenyamanan Sarana Duduk Taman Buah Lubuk Pakam

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Novrial ◽  
Nadya Raudina
Keyword(s):  
Research Method ◽  
Design Criteria ◽  
Research Subjects ◽  
Validation Test ◽  
Descriptive Qualitative

Penelitian ini dilatarbelakangi oleh semakin beragamnya aktivitas yang dapat dilakukan saat berada di taman. Keberagaman aktivitas inilah yang kemudian menimbulkan kecenderungan pengunjung dalam memilih desain dan tata letak sarana duduk yang nyaman guna mendukung aktivitas selama berada di taman. Penelitian ini bertujuan untuk mengetahui faktor-faktor dan dampak-dampak apa saja yang dirasakan pengunjung terkait kenyamanan pada sarana duduk taman  secara umum dan mengetahui apa saja kebutuhan pengunjung terkait sarana duduk taman. Subjek penelitian adalah pengunjung taman tanpa ada batasan-batasan usia ataupun kategorisasi lain. Metode penelitian yang digunakan adalah deskriptif kualitatif, yaitu dengan melakukan observasi dan pengamatan secara langsung dan mendalam terhadap taman yang dijadikan studi kasus pada penelitian ini. Data yang didapatkan kemudian diolah dan dianalisis. Hasil analisis kemudian dilakukan uji validasi akhir pada penelitian untuk memastikan kecocokan hasil observasi dan pengamatan dengan uji validasi yang telah dilakukan. Hasil penelitian berupa kriteria desain dan tata letak sarana duduk yang baik dan nyaman bagi pengunjung taman. This research is motivated by the increasing variety of activities that can be done while in the park. The diversity of activities is what then raises the tendency of visitors to choose the design and layout of comfortable seating to support activities while in the park. This study aims to determine the factors and impacts that are felt by visitors related to the comfort of the park seating facilities in general and find out what visitors need related to park seating facilities. Research subjects were park visitors without age restrictions or other categorizations. The research method used is descriptive qualitative, namely by making observations and direct and in-depth observations of the park used as a case study in this study. The data obtained is then processed and analyzed. The results of the analysis are then carried out the final validation test in the study to ensure compatibility of observations and observations with the validation test that has been done. The results of the study were in the form of design criteria and good and comfortable seating facilities for park visitors.

Parametric Modeling as a Tool of Analysis and Interpretation of Built Heritage

2019 ◽  
pp. 366-402
Author(s):  
Marco Vitali ◽  
Roberta Spallone ◽  
Francesco Carota
Keyword(s):  
Parametric Modeling ◽  
Design Criteria ◽  
Architectural Heritage ◽  
Modeling Tools ◽  
The Past ◽  
Built Heritage ◽  
Digital Modeling ◽  
Modeling Software

In this chapter are developed some considerations about the heuristic potentialities of parametric digital modeling as a tool for analyzing and interpreting architectural heritage. Observed that the parametric thinking in architecture could be recognized almost from the origin, new parametric modeling software allows to verify the design criteria of the past. On the basis of previous studies on Baroque vaulted atria, this chapter develops, using parametric modeling tools, a real vocabulary of shapes and their possible combinations, suggested by the architectural literature of the time and the survey of about seventy atria in Turin. This method has been tested on the case study of the lunettes dome in the atrium of Palazzo Carignano.

Village Drill: A Case Study in Engineering for Global Development, With Five Years of Data Post Market-Introduction

2016 ◽  
Author(s):  
Christopher A. Mattson ◽  
Amy E. Wood ◽  
John Renouard
Keyword(s):  
Development Time ◽  
Clean Water ◽  
Global Development ◽  
New Developments ◽  
Testing Conditions ◽  
Post Market ◽  
Realistic View ◽  
The Impact ◽  
The Village

This paper presents a case study in engineering for global development. It introduces the Village Drill, which is an engineered product that has now — five years after its introduction to the market — enabled hundreds of thousands of people across 15 countries and three continents to have access to clean water. The Village Drill creates a 15 cm (6 inch) borehole as deep as 76 m (250 feet) to reach groundwater suitable for drinking. It was designed and developed by the authors together with a team of talented individuals from various disciplines. The case study presents facts and figures for the actual development and sustaining scenario and are unaltered for the purpose of publication. This approach provides the reader with a realistic view of the development time, testing conditions, fundraising, and the work needed to sustain the drill through five years of sales and distribution. The purpose of the case study is to provide sufficient and frank data about a real project so as to promote discussion, critique, and other evaluations that will lead to new developments that inspire and inform successful engineering for global development. As part of the case, the paper describes six fundamental items related to the endeavor; the product, the customer, the impact, the manufacturing, the delivery, and the revenue model of the drill.

Study on the transfer and anchorage length of steel strand in ultra high performance concrete material

2020 ◽  
Vol 10 (2) ◽  
pp. 153-164
Author(s):  
Hui Zheng ◽  
Dongdong Zhou ◽  
Xinfeng Yin ◽  
Lei Wang
Keyword(s):  
Bond Strength ◽  
High Performance ◽  
Failure Modes ◽  
High Performance Concrete ◽  
Protective Layer ◽  
Experimental Results ◽  
Ultra High Performance Concrete ◽  
Anchorage Length ◽  
Pull Out ◽  
Steel Strand

Ultra-high-performance concrete (UHPC) material, a new type of cement-based composite material, is usually employed in the bridge engineering. The transfer and anchorage length of steel strand in UHPC material is different from that in ordinary concrete; nevertheless, few design standards are found that how to anchor the transfer and anchoring length of steel strand in UHPC material under normal curing. Through central pull-out test under the different conditions of protective layer thickness and embedded length, the load-slip curves, failure modes, and bond strength of 36 UHPC material specimens under normal curing were studied. The experimental results showed that the ultimate bond stress between UHPC material and steel strand under natural curing conditions is 7.01∼11.68 MPa. When the compressive strength of cube was 157 MPa; the bond strength under natural curing was smaller than that under thermal curing; when the thickness of the protective layer of steel strand with a diameter of 15.2 mm is greater than 30 mm, it had a little influence on bond strength. The regression analysis of the test results based on the experimental results proves that the recommended formulas for the design of transfer length and anchorage length of steel strand in UHPC material were in great agreement with the results of published studies.

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