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ARTICLES YOU MAY BE INTERESTED INAbstract.The introduction of High-Strength Steel (HSS) reinforcing bars in reinforced concrete members has gained much attention in recent years and led to many advantages such as construction timesaving. It is also more economical since it can reduce the amount of reinforcing steel bars used in concrete members which in turn alleviates the congestion of reinforcement. Up to present, the building codes, e.g. American Concrete Institute (ACI) 318M-14 and Standard National Indonesia (SNI) 2847:2013, still restrict the use of higher-strength steel reinforcing bars for concrete design up to Grade 420 MPa due to the possible suspected brittle behavior of concrete members. This paper evaluates the characteristics of stress-strain relationships of HSS bars if they are comparable to the characteristics of those of Grade 420 MPa. To achieve the objective of the study, a series of steel bars from various grades (420, 550, 650, and 700 MPa) was selected. Tensile tests of these steel samples were conducted under displacement-controlled mode to capture the complete stress-strain curves and particularly the post-yield response of the steel bars. The results indicate that all the steel bars tested had the actual yield strengths greater than the corresponding specified values. The stress-strain curves of HSS reinforcing bars (Grade 550, 650, and 700 MPa) performed slightly different characteristics with those of Grade 420 MPa.

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The scarcity of Islamic learning materials especially guidance to do shalah using animation technology with interactive interfaces become a reason to the implementation of thisstudy. In this study, we integrates Augmented Reality (AR) elements into a children’s learning book, named AR SHALAT 4D Educational Book. It has been designed in ‘Markerless-based AR’ using mobile devices. The study was tested on an audience of randomly selected children aged 5-6 years and give the conclusion that, AR prayer is a suitable app for solving problems for prayer. Furthermore, this app can be used as one of the forms of mobile learning to the Muslim community regardless of age and background limit