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This study aimed to redesign a ten-story hotel building, originally made of reinforced concrete, with a composite steel structure to reduce its weight. The ETABS SoftwareV18 was used to remodel the original structure and conduct a preliminary design of beams and columns using WF profiles. The force values were manually calculated to meet the requirements of SNI 1726:2015 and PPURG 1987 standards. The largest beam used a shear connector with a diameter of 25 mm, while the largest composite column had a dimension of 550 mm X 550 mm and a WF profile of 400.400.13.2. The results showed that the composite steel structure had a lighter weight of 37.45% compared to the original structure, and its material had smaller drift between two stories. These findings indicate that a composite steel structure can be a viable alternative to reinforced concrete in constructing high-rise buildings, providing better weight efficiency without compromising structural safety. [ABSTRACT FROM AUTHOR]

On worksmanship, a project is required to supervise and meet three standards to finish a project, which is time, cost, and quality. In some occasion, some works unable to meet the predetermined plan. Project in this review is Yonif 611/AWL rifle company Samarinda facility and building replacement project which conducted in April to November 2018 for 219 days. This research, using earned value method to analyze performance of a project. This research aims to analyse earned value method calculation, time and cost estimation to finish the project, and solutions that could be taken as induced by identified obstacles. Based on data and analysis results conducted on week – 19th, identified the BCWS value is Rp 2,708,019,167.97, BCWP value is Rp 2,590,292,728.78, and ACWP Value is Rp 2,346,136,827.99. Schedule Variant (SV) is Rp –(117,726,439.19) and Cost Variant (CV) is Rp 244,155,900.79. Schedule Performance Index (SPI) is 0.91 and Cost Performance Index (CPI) is 1.10. [ABSTRACT FROM AUTHOR]