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Immunoglobulin G<sub>4</sub>-related sclerosing cholangitis
( George Goodchild ),( Stephen P. Pereira ),( George Webster ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.5
Immunoglobulin G<sub>4</sub>-related disease (IgG<sub>4</sub>-RD) is a systemic fibroinflammatory condition of which Ig<sub>G</sub>4-related sclerosing cholangitis (IgG<sub>4</sub>-SC) is the biliary manifestation. In this review, we provide an overview of IgG<sub>4</sub>-RD, with a focus on the biliary manifestations. In particular, we describe the important differential diagnoses of IgG<sub>4</sub>-SC, namely, primary sclerosing cholangitis and cholangio-carcinoma, outline diagnostic criteria for IgG<sub>4</sub>-SC, provide insight into possible pathophysiological mechanisms underlying the disease and discuss short and long-term management options of this recently described disease.
Immunoglobulin G4-related sclerosing cholangitis
George Goodchild,Stephen P. Pereira,George Webster 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.5
Immunoglobulin G4-related disease (IgG4-RD) is a systemic fibroinflammatory condition of which IgG4-related sclerosing cholangitis (IgG4-SC) is the biliary manifestation. In this review, we provide an overview of IgG4-RD, with a focus on the biliary manifestations. In particular, we describe the important differential diagnoses of IgG4-SC, namely, primary sclerosing cholangitis and cholangiocarcinoma, outline diagnostic criteria for IgG4-SC, provide insight into possible pathophysiological mechanisms underlying the disease and discuss short and long-term management options of this recently described disease.
Deformation of multi-storey flat slabs, a site investigation
Tovi, Shivan,Goodchild, Charles,B-Jahromi, Ali Techno-Press 2017 Advances in concrete construction Vol.5 No.1
Traditional reinforced concrete slabs and beams are widely used for building. The use of flat slab structures gives advantages over traditional reinforced concrete building in terms of design flexibility, easier formwork and use of space and shorter building time. Deflection of the slab plays a critical role on the design and service life of building components; however, there is no recent research to explore actual deformation of concrete slab despite various advancements within the design codes and construction technology. This experimental study adopts the Hydrostatic Levelling Cells method for monitoring the deformation of a multi-storey building with flat slabs. In addition, this research presents and discusses the experimental results for the vertical deformation.
Reza Keihani,Ali Bahadori-Jahromi,Charles Goodchild,Katherine A. Cashell 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.1
Shear walls are structural members in buildings that are used extensively in reinforced concrete frame buildings, and almost exclusively in the UK, regardless of whether or not they are actually required. In recent years, the UK construction industry, led by the Concrete Centre, has questioned the need for such structural elements in low to mid-rise reinforced concrete frame buildings. In this context, a typical modern, 5-storey residential building is studied, and its existing shear walls are replaced with columns as used elsewhere in the building. The aim is to investigate the impact of several design variables, including concrete grade, column size, column shape and slab thickness, on the building’s structural performance, considering two punching shear limits (VEd/VRd,c), lateral drift and accelerations, to evaluate its maximum possible height under wind actions without the inclusion of shear walls. To facilitate this study, a numerical model has been developed using the ETABS software. The results demonstrate that the building examined does not require shear walls in the design and has no lateral displacement or acceleration issues. In fact, with further analysis, it is shown that a similar building could be constructed up to 13 and 16 storeys high for 2 and 2.5 punching shear ratios (VEd/VRd,c), respectively, with adequate serviceability and strength, without the need for shear walls, albeit with thicker columns.
B-Jahromi, Ali,Rotimi, Abdulazeez,Tovi, Shivan,Goodchild, Charles,Rizzuto, Joseph Techno-Press 2017 Advances in concrete construction Vol.5 No.2
The phenomenon of concrete column shortening has been widely acknowledged since it first became apparent in the 1960s. Axial column shortening is due to the combined effect of elastic and inelastic deformations, shrinkage and creep. This study aims to investigate the effects of ambient temperature, relative humidity, cement hardening speed and aggregate type on concrete column shortening. The investigation was conducted using a column shortening prediction model which is underpinned by the Eurocode 2. Critical analysis and evaluation of the results showed that the concrete aggregate types used in the concrete have significant impact on column shortening. Generally, aggregates with higher moduli of elasticity hold the best results in terms of shortening. Cement type used is another significant factor, as using slow hardening cement gives better results compared to rapid hardening cement. This study also showed that environmental factors, namely, ambient temperature and relative humidity have less impact on column shortening.
Reza Keihani,Ali Bahadori-Jahromi,Charles Goodchild 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.5
According to The Concrete Centre, in the UK shear walls have become an inseparable part of almost every reinforced concrete frame building. Recently, the construction industry has questioned the need for shear walls in low to mid-rise RC frame buildings. This study tried to address the issue in two stages: The first stage, the feasibility of removing shear walls in an existing design for a residential building where ETABS and CONCEPT software were used to investigate the structural performance and cost-effectiveness respectively. The second stage, the same structure was examined in various locations in the UK to investigate regional effects. This study demonstrated that the building without shear wall could provide adequate serviceability and strength within the safe range defined by Eurocodes. As a result, construction time, overall cost and required concrete volume are reduced which in turn enhance the sustainability of concrete construction.
Comparative study of factors influencing tension lap splices in reinforced concrete beams
Karkarna, Yakubu M.,Bahadori-Jahromi, Ali,Jahromi, Hamid Zolghadr,Bonner, Emily,Goodchild, Charles Techno-Press 2020 Advances in concrete construction Vol.10 No.4
The practice of splicing reinforcing bars in reinforced concrete structures to manage insufficient bar length is a common approach, which is mainly due to transportation limitations on bar length. The splicing of reinforcing bars side by side offers a simple and economical solution to the problem of continuity. This paper examines the influence of different structural parameters such as concrete cover, lap splice length, shear links confinement and concrete strength on the lap splices based on an extensive experimental database of laps and anchorage. The current study shows that increasing the lap splices beyond 50Ø has no additional benefit for increasing its strength. The results also show that relative to the measured stress, specimens with larger concrete side covers shows higher splice stress compared to the samples with smaller concrete covers.