Axial compressive behavior of square and rectangular high-strength concrete-filled FRP tubes

This paper presents results of an experimental study on the behavior of square and rectangular high-strength concrete (HSC)-filled fiber-reinforced polymer (FRP) tubes (HSCFFT) under concentric compression. The effects of the tube thickness, sectional aspect ratio, and corner radius on the axial compressive behavior of concrete-filled FRP tubes (CFFT) were investigated experimentally through the tests of 24 CFFTs that were manufactured using unidirectional carbon fiber sheets and high-strength concrete with 78 MPa average compressive strength. As the first experimental investigation on the axial compressive behavior of square and rectangular HSCFFTs, the results of the study reported in this paper allow a number of significant conclusions to be drawn. First and foremost, test results indicate that sufficiently confined square and rectangular HSCFFTs can exhibit highly ductile behavior. The results also indicate that confinement effectiveness of FRP tubes increases with an increase in corner radius and decreases with an increase in sectional aspect ratio. It is also observed and discussed that HSCFFTs having tubes of low confinement effectiveness may experience a significant strength loss at the point of transition on their stress-strain curves. Furthermore, it is found that the behavior of HSCFFTs at this region differ from that of normal-strength CFFTs and that it is more sensitive to the effectiveness of a confining tube. Examination of the test results have also lead to a number of important observations on the influence of the key confinement parameters on the development and distribution of the hoop strains on the tubes of CFFTs, which are presented and discussed in the paper. © 2013 American Society of Civil Engineers.Togay Ozbakkalogl

The Role of MRI in Rectal Cancer: An Updated Review

Purpose of Review: To bring the radiologists up to date on the state of the art of the magnetic resonance imaging protocol of the rectal cancer and on the findings to consider for reports. Recent Findings: Recently, the European Society of Gastrointestinal and Abdominal Radiology updated the 2012 guidelines with new recommendations on the acquisition and reporting of MRI for staging and restaging of rectal cancer; furthermore latest advanced MRI techniques (diffusion-weighted imaging, dynamic contrast-enhanced imaging, kurtosis) are object of ongoing studies with promising results. Summary: Magnetic resonance imaging plays a fundamental role in rectal cancer staging and restaging; moreover, it allows the detection of some findings with prognostic value. This review includes the last 2016 European Society of Gastrointestinal and Abdominal Radiology Updated Recommendations on magnetic resonance imaging protocol, interpretation, and reporting

Analytical Modeling of Splitting Bond Failure for NSM FRP Reinforcement in Concrete

none2L. De Lorenzis; A. La TegolaDE LORENZIS, Laura; A., La Tegol

The association between dietary magnesium intake and magnetic resonance parameters for knee osteoarthritis

The aim of the study was to evaluate the relationship between dietary magnesium (Mg) intake and prevalence of knee osteoarthritis (OA), a topic poorly explored in the literature. Overall, 783 people participating in the Osteoarthritis Initiative (59.8% females; mean age: 62.3 years) and having an MRI assessment were enrolled in this cross-sectional study. Mg intake was measured with a semi-quantitative food frequency questionnaire, and its association with knee OA was evaluated for an increased intake of 100 mg/day. Using an adjusted linear regression analysis, a higher Mg intake (i.e., increase of 100 mg/day) corresponded to a significant increase in mean cartilage thickness, cartilage volume at medial tibia, cartilage volume and mean cartilage thickness at central medial femur, and cartilage volume and mean cartilage thickness in the central medial tibiofemoral compartment. In conclusion, an increased Mg dietary intake is associated with a better knee cartilage architecture, also when adjusting for potential confounders, suggesting a potential role of Mg in the prevention and treatment of knee OA. © 2019 by the authors. Licensee MDPI, Basel, Switzerland. All rights reserved