A Numerical Study on Installation Effects and Long-Term Shaft Resistance of Pre-Bored Piles in Cohesive Soils

2019 ◽  
Vol 2673 (3) ◽  
pp. 494-505 ◽  
Author(s):  
Lin Li ◽  
Shengli Chen ◽  
Zhongjie Zhang
Keyword(s):  
Numerical Study ◽  
Large Displacement ◽  
Vertical Shear ◽  
Soil Conditions ◽  
Routine Practice ◽  
Cohesive Soils ◽  
Shaft Resistance ◽  
Bored Piles ◽  
Design And Construction

Pre-boring is a technique widely used to facilitate large displacement pile driving in hard/dense soils, but usually at the expense of reducing the long-term shaft resistance of the pile. In the US, it is a routine practice for large displacement pile to be driven through dense cohesive soils with the ultimate capacity of pre-bored piles usually being determined based on empiricism and local experience. Understanding and quantifying the impacts of pre-boring installation on pile capacity can greatly help geotechnical design engineers to understand the interactions among the factors of pre-boring, pile size, soil conditions, and so forth and to improve the design and construction qualities of pile foundations in hard/dense soils. Due to the high cost and time involved with field instrumentation and testing on pre-bored piles, a numerical analysis study was funded by the Louisiana Department of Transportation and Development (DOTD) as a first step to exploring the impacts of pre-bore size on the long-term shaft resistance reduction of piles. This study was conducted using a practical finite element model that integrates the entire process from pile installation through subsequent consolidation to pile loading. The long-term shaft resistance was then examined after full consolidation by applying a vertical shear displacement on the soil element adjacent to the pile until the ultimate state was reached. Based on the numerical simulations, a set of reduction factor curves were then developed for a typical Louisiana soil stratum, which may provide guidelines for better design and construction of pre-bored piles in Louisiana.

Experimental and numerical study of size effect on long-term drying behavior of concrete: influence of drying depth

2016 ◽  
Vol 49 (10) ◽  
pp. 4029-4048 ◽  
Author(s):  
H. Samouh ◽  
A. Soive ◽  
E. Rozière ◽  
A. Loukili
Keyword(s):  
Size Effect ◽  
Numerical Study ◽  
Drying Behavior

Feasibility barriers and effectiveness of specific treatments for early psychosis in routine mental health care

2011 ◽  
Vol 26 (S2) ◽  
pp. 2042-2042
Author(s):  
M. Ruggeri
Keyword(s):  
Psychosocial Interventions ◽  
Early Psychosis ◽  
Control Group ◽  
Routine Practice ◽  
Evidence Based ◽  
Roles And Responsibilities ◽  
Or Practice ◽  
Representative Samples ◽  
Poor Management

IntroductionIssues of organisational structure and commitment, resource development, and clarity of roles and responsibilities must be addressed before proceeding with any attempt to implement evidence based interventions in a specific service.Evidence suggests that the management of most mental disorders and especially of psychoses is frequently suboptimal. This trend might reflect instances of inadequate resource allocation, but might also reflect the effects of stigma, discrimination, and social exclusion that people with psychosis often experience. It might also indicate poor management of available resources or deficiencies in knowledge or practice.AimsMulti-element psychosocial interventions in the first 5 years from psychosis onset have proved to facilitating recovery and reducing long-term disability. However, most studies often do not test efficacy against a control group and have been conducted in non-epidemiologically representative samples. The presentation will be focussed on process of assessment of acceptability and discrepancies between evidence and clinical practice in the treatment of schizophrenia in community care.Methods and ResultsTrials - such as the GET UP Trial (National Coordinator: Mirella Ruggeri) that is part of the Strategic Research Programs of the Italian Government - that are being conducted in the routine practice and that aim to test the feasibility and cost-effectiveness of evidence-based psychosocial interventions will be presented and discussed.ConclusionsVerify the barriers to application and situations when evidence-based interventions practice might be ineffective or inappropriate, understanding their advantages and limitations is a crucial challenge in the area of early psychosis treatment.

Lymphoscintigraphy in clinical routine practice: Reproducibility and accuracy in melanoma patients with a long-term follow-up

2014 ◽  
Vol 40 (1) ◽  
pp. 55-60 ◽  
Author(s):  
G.C. Vitali ◽  
G. Trifirò ◽  
M. Zonta ◽  
E. Pennacchioli ◽  
L. Santoro ◽  
...  
Keyword(s):  
Routine Practice ◽  
Clinical Routine ◽  
Long Term Follow Up ◽  
Melanoma Patients

scholarly journals Contribution to the Sustainability of Agricultural Production in Greenhouses Built on Slope Soils: A Numerical Study of the Microclimatic Behavior of a Typical Colombian Structure

2021 ◽  
Vol 13 (9) ◽  
pp. 4748
Author(s):  
Edwin Villagran ◽  
Carlos Bojacá ◽  
Mohammad Akrami
Keyword(s):  
Latin American ◽  
Crop Yields ◽  
Numerical Study ◽  
Air Flow ◽  
Research Work ◽  
Flow Patterns ◽  
Soil Conditions ◽  
Air Velocity ◽  
The Hours ◽  
Microclimatic Conditions

The use of covered structures is an alternative increasingly used by farmers to increase crop yields per unit area compared to open field production. In Latin American countries such as Colombia, productive areas are located in with predominantly hillside soil conditions. In the last two decades, farmers have introduced cover structures adapted to these soil conditions, structures for which the behavior of factors that directly affect plant growth and development, such as microclimate, are still unknown. Therefore, in this research work, a CFD-3D model successfully validated with experimental data of temperature and air velocity was implemented. The numerical model was used to determine the behavior of air flow patterns and temperature distribution inside a Colombian passive greenhouse during daytime hours. The results showed that the slope of the terrain affects the behavior of the air flow patterns, generating thermal gradients inside the greenhouse with values between 1.26 and 16.93 °C for the hours evaluated. It was also found that the highest indoor temperature values at the same time were located in the highest region of the terrain. Based on the results of this study, future researches on how to optimize the microclimatic conditions of this type of sustainable productive system can be carried out.

Rose Fitzgerald Kennedy bridge over the River Barrow. Design and Construction of a long span extrados bridge

2021 ◽  
Author(s):  
Marcos Sanchez Sanchez ◽  
John Iliff
Keyword(s):  
State Of The Art ◽  
Single Plane ◽  
Robust Approach ◽  
Analysis Techniques ◽  
Long Span ◽  
The World ◽  
Art Analysis ◽  
Concrete Deck ◽  
Design And Construction

<p>This paper describes the key elements from early planning to completion of a new bridge over the River Barrow which is part of the New Ross bypass in the south of Ireland. The structure has a total length of 887m, with a span arrangement of 36-45-95-230-230-95-70-50-36m. The two central twin spans are the longest of its kind in the world (extrados with a full concrete deck). The bridge carries a dual carriageway with a cable arrangement consisting of a single plane of cables located in the central axis of the deck. The design and construction focused in providing a structure with long term durability, resilience, and a robust approach to design scenarios using the Eurocodes and state of the art analysis techniques, including extreme events such as fire and ship impact<i>.</i></p>

Experimental and numerical study on the in-plane behaviour of concrete-filled steel tubular arches with long-term effects

2021 ◽  
Vol 169 ◽  
pp. 108507
Author(s):  
Xu Han ◽  
Bing Han ◽  
Huibing Xie ◽  
Wutong Yan ◽  
Qi Ma
Keyword(s):  
Numerical Study ◽  
Long Term Effects

The crystal arthropathies

2013 ◽  
Vol 6 (11) ◽  
pp. 681-687 ◽  
Author(s):  
Robert A Jones ◽  
Brian Quilty
Keyword(s):  
Quality Of Life ◽  
Risk Factors ◽  
Inflammatory Arthritis ◽  
Term Treatment ◽  
Routine Practice ◽  
Treatment Goals ◽  
Crystal Arthropathies ◽  
Long Term Treatment

Unlike many other forms of inflammatory arthritis, the crystal arthropathies are routinely diagnosed and managed in primary care. Gout, in particular, is relatively commonplace and rates of other types of crystal-related arthritis are predicted to increase. These are, therefore, conditions that GPs and trainees will regularly encounter during routine practice. While the clinical features and pathophysiology of gout and pseudo-gout are well described, the long-term treatment goals and options of management are often less well understood, and opportunities to assess for associated co-morbidities can easily be missed. GPs can be central in optimising management by promptly and appropriately addressing acute symptoms, preventing recurrent attacks, minimising disability and work absences, reducing cardiovascular risk factors, improving general health and enhancing quality of life.

Numerical study on long-term monopile foundation response

2017 ◽  
Vol 36 (2) ◽  
pp. 190-196 ◽  
Author(s):  
Song-Hun Chong ◽  
Cesar Pasten
Keyword(s):  
Numerical Study

scholarly journals Long-Term Clinical Outcomes of Patients Treated With Everolimus-Eluting Bioresorbable Stents in Routine Practice

2017 ◽  
Vol 10 (12) ◽  
pp. 1222-1229 ◽  
Author(s):  
Jens Wiebe ◽  
Petra Hoppmann ◽  
Roisin Colleran ◽  
Sebastian Kufner ◽  
Michael Valeskini ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Routine Practice

scholarly journals Bioabsorbable vascular scaffolds in routine practice: long-term results

2021 ◽  
Vol 42 (Supplement_1) ◽  
Author(s):  
R M Mori ◽  
I N G Nunez
Keyword(s):  
Protective Factor ◽  
Randomized Clinical Trials ◽  
Real Life ◽  
Long Term Results ◽  
Routine Practice ◽  
Target Vessel ◽  
Intracoronary Imaging ◽  
Vascular Scaffolds

Abstract Background Recent publications suggest that bioabsorbable vascular scaffolds (BVS) carry an excess of thrombotic complications. Our goal was to describe the results in real life and in the long term, in a series of patients who received a BVS which is currently off the market. Methods Two hundred and thirteen consecutive patients who received at least 1 BVS between May 2012 and December 2016 were analyzed. The primary objective was the incidence of the compound event “target vessel failure” that included infarction or target vessel revascularization and cardiac death. Results Seventy-five percent of patients were men with a mean age of 61.4 years. They had a high prevalence of dyslipidemia (62.44%) and smoking (65.26%). The most common cause of admission was myocardial infarction without ST elevation (53.52%). A total of 233 coronary lesions were treated, with an average of 1.3±0.3 lesions per patient. The implant was successful in 99.5% of cases. Predilatation was performed in 89.3% and post dilation in 33.5% of cases. The use of intracoronary imaging (Optical Coherence Tomography OCT and/or Intravascular ultrasonography IVUS) to optimize the BVS implant was performed in 86 patients (40.38%). With a mean follow-up of 42.5 months, the incidence of target vessel failure was 6.57% during the first 24 months and 7.98% at the end of the follow-up. Regarding the device, this included 6 cases (2.81%) of thrombosis (definitive, probable or possible) and 10 cases (4.69%) of restenosis. Patients with a history of diabetes mellitus (HR 1.72 95% CI 1.01–2.95 P=0,05) and/or chronic oral anticoagulation (HR 5.71 95% CI 1.12–28.94 P=0.04) had a higher risk of target vessel failure. The use of intracoronary imaging (OCT and/or IVUS) during the BVS implantation had a considerable trend toward significance as a protective factor (HR 0.32 95% CI 0.11–1.03 P=0.06). Conclusions In this series of patients; in real life conditions, the incidence of target vessel failure was comparable to that previously described in randomized clinical trials. The events were more frequent during the first 2 years of follow-up, in the presence of greater cardiovascular comorbidity and in the absence of intracoronary imaging during the implantation. FUNDunding Acknowledgement Type of funding sources: Other. Main funding source(s): European Society of Cardiology KM curve for target vessel failure (TVF) Predictor analysis for TVF

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