1,721,165 research outputs found
Numerical modelling of seepage and tension beneath plate anchors
No full textThe uplift capacity of buried plate anchors depends on the tension sustained beneath the anchor. This study provides a detailed treatment of interface tension and the associated seepage flow and gap formation below the anchor. This behaviour is explored via large deformation finite element analysis using a thin highly compressible porous layer for the gap. The observed seepage effect is captured by a simple model using Hvorslev's intake factor, validated across a wide parameter range. This model for uplift capacity at various pull-out rates provides a simple basis for the effect of seepage on plate anchor capacity under sustained loading.</p
Uplift resistance of buried pipelines: The contribution of seepage forces
No full textPipelines are commonly buried, and can buckle upwards when heated if there is insufficient soil uplift capacity. Interface tension beneath the buried pipe significantly influences the uplift capacity at shallow embedments. Conventional design approaches, which consider either zero or unlimited interface tension, do not assess and quantify the effect of interface tension on uplift capacity. The present study bridges the gap between conventional “no tension” and “full tension” capacities. Mobilisation of interface tension is governed by seepage forces which in turn directly control the formation of a gap beneath the pipe. A large deformation finite element approach, which simulates this phenomenon of gap formation using a thin layer of gap elements below the pipe, is adopted to study the soil response for various cases of uplift velocity, embedment and soil weight. The enhancement in undrained shear strength of soil at higher uplift velocities due to strain rate effects has also been considered. The interface tension mobilised at these different velocities and embedments varies systematically in a way that is expressed by modifying Hvorslev's intake factors. The proposed expressions may be used with the existing methodologies to assess pipe stability during operation, demonstrated here through a design example
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Integrity of sub-structural systems during earthquake: indian and international perspectives.
No full textStructural integrity of underground constructions or sub-structures like foundations, anchors, basements, piles, piers, abutments, retaining walls, subgrade of railway, highway, airport runway etc. are important concern for the engineers and researchers in the entire world to advance on the infrastructural developments of any country. Several historical giant earthquakes all over the world had always put the researchers and engineers to the new challenge for developing advanced and new techniques of design and construction to maintain the structural integrity of the infrastructural systems. In this paper, the state-of-the-art type analysis and design techniques for behavior of such sub-structural system during seismic events are discussed. In this connection, the role of the design codes in India with a comparison to such activities around the world using international design codes is discussed. The importance of soil profile with seismic characterization is highlighted. Benefits of the recently proposed and validated pseudo-dynamic approach over the conventional pseudo-static approach have been revealed. The mitigation technique such as the use of geosynthetic materials for the stability and integrity of such substructures during seismic events is also discussed. The latest trends in research and practice for design of sub-structural systems in India and other countries are revealed
Editorial: special issue of igc-2022 keynote volume.
No full textGreetings of the New Year 2024 to all the readers of Indian Geotechnical Journal (IGTJ). This first issue of volume 54 of IGTJ in 2024 is tagged as ‘Special issue of IGC-2022 Keynote Volume.’ The Indian Geotechnical Conference (IGC) is an annual flagship event of the national Indian Geotechnical Society (IGS), New Delhi, India. IGC-2022 with the major theme GEOLEAP—Geotechnics: Learning, Evaluation, Analysis and Practice was hosted by the Indian Geotechnical Society (IGS) Kochi Chapter in association with the Cochin University of Science and Technology (CUSAT) and was held during December 15–17, 2022, at Hotel Le Meridien Kochi, Kerala, India.
This special issue is a collection of some of the peer-reviewed selected keynote and theme lecture articles of IGC-2022. The first article of this issue is the 44th IGS Annual Lecture, which was delivered by Prof. A. Boominathan during IGC-2022 at Kochi. It followed by some of the keynote lecture articles and then theme lecture articles of IGC-2022. In total, 15 articles are there from IGC-2022. For these articles, the Guest Editors were: Prof. Benny Mathews Abraham, Prof. K. S. Beena and Dr. Jimmy Thomas. Guest Editors were assisted by the IGC-2022 Kochi Conference Chair Dr. Babu T. Jose, Conference Co-Chair Mr. M. D. Nair and Conference Organising Secretary Dr. Anil Joseph.
The last 3 additional peer-reviewed articles are from selected invited papers of Eighth Indian Young Geotechnical Conference (8IYGEC 2021), which was jointly hosted by Indian Geotechnical Society Chennai Chapter, in association with Indian Institute of Technology Madras, Anna University, Chennai, NITTTR Chennai and SRM Institute of Science and Technology, Chennai, under the umbrella of national Indian Geotechnical Society (IGS), New Delhi, India. These 3 articles are Guest Edited by the Organizing Chair of 8IYGEC 2021, Prof. T. Thyagaraj and IGS Chennai Chapter Chair, Prof. M. Muttharam.
To recognize the significant contributions made by the various reviewers of IGTJ, Springer along with IGS give Best Reviewer Awards since last few years at the time of annual conference of IGS, i.e., IGC. Last year, the number of awards has been increased from three (3) to nine (9) Best Reviewers Awards, as large number of reviewers are performing and contributing significantly for the growth of this journal. Based on the Springer data and ensuring a detailed and timely review of significant number of manuscripts during a year, the journal committee had finalized the following Best Reviewer Awards for performance during 2022 and a special contribution award to the previous outgoing Editor-in-Chief (EiC), which were given during the valedictory function of the Indian Geotechnical Conference (IGC-2023) at IIT Roorkee on December 16, 2023
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