Efficiency and Effectiveness Comparative Analysis of Wide Flange Beams and Cellular Beams in A Case Project United Tractor

United Tractors Company will build a sports center building consist of 3 floors using steel structures. Nowadays, limited land is one of the building development problems. The construction of multi-stored buildings is a solution to the limited land problem. The writer has analyzed beam design with a Wide Flange and Cellular system. Focused on the beam element with construction material in the form of steel with steel quality BJ-37, Fy 240 MPa, Fu 370 MPa. The strength and efficiency of the use of steel tonnage were also analyzed. E-Tabs software 2016 used to steel beam structure analysis. In this beam design planning refers to the steel structure planning following SNI 1729: 2015, SNI 1727: 2013, AISC 2010, ASCE 7-10, and also AISC Design Guide 31. The results of manual verification show that the cross-section of WF 400x200x8x13 and CB 250x125x5x8 with a span length of 6 meters is declared to be strong and safe because fill the strong requirements needs to be smaller than the strength of the plan. The efficiency of the use of Cellular Beam was compared to Wide Flange, the longer of Cellular Beam will increase steel tonnage reductions. The percentage reduction in steel weight will continue to increase when the length of steel usage also increases. This concludes that the use of steel length with steel weight reduction will move linearly. Where in this project with a steel beam length of 1439.27m reduction of steel tonnage was at 19.5%.


Introduction
Enthusiasme to exercise the employees of PT. United Tractor encourage management to provide sports facilities and infrastructure. Nowadays, limited land is one of building development problem. The construction of multi-storey buildings is the solution. One of important things in construction of multi-storey building is structural planning. In planning a multi-storey building structure basically must following criteria: Strong in holding planned loads, requirements of serviceability, high durability, accordance with the surrounding environment, economical and easy to maintain [5].
In structural planning, it is necessary to analyze the structure of the reaction caused by axial and lateral forces towards building structure. Structural elements must be designed to able carry an overload of a certain amount, outside of the load expected to occur of normal conditions. Spare capacity is needed to anticipate the possibility of overload factors and undercapacity factors [5]. Based of the problem, this paper analyzes the structures that only review the upper structure, which is the beam element. In this discussion, will analyze the beams with a Wide Flange and Cellular system which will be reviewed regarding the strength and efficiency of the use of steel tonnage. Cellular beam is profile steel I with openings on the body part is which is made by cutting standard profile body parts into 2 parts along the span, then separated, shifted and welded back into new shapes (J.P. Boyer, 1964). The results of this process make the steel profile has higher than the beginning, resulting in the addition of inertia. Increasing inertia will increase the ability of the steel. The economic value of profile I can increase, because with the initial profile I the dimensions are smaller and lighter can be formed into a profile that has a higher height [6]. The steel beam structure analysis is based on SNI 1729: 2015 procedures for planning steel structures for buildings. By using the help of ETABS 2016 computer software for structural analysis.
The rules used are the regulations issued are as follows:

Methodology
Analysis method used in building structure modeling where the planning used two system, Wide Flange beam system and the Cellular beam system. This research method uses case study analysis method. Case study method is in the form of re-planning with a model that is made in accordance with existing building conditions. The research method used has stages of input, analysis and output. At the input stage will be explained about the structure geometry, dimensions, and specifications of structural elements, the determination of the burden of working with 3-dimensional modeling. The stages of analysis include structural modeling using the 2016 ETABS software. The final stage is the output stage which discusses the strength and efficiency of using steel tonnage. The final result of this plan is to find out what is the tonnage ratio of each design and find out which design is the most efficient if applied to this project.   Figure 2. 3D Modeling Source: ETABS Modeling In this study there are 2 types of data, primary data is existing data obtained from the project under study and secondary data from alternative design experiments. The data is then analysed following stages of the research carried out are as follows:

Existing Data
In this case referring to for construction (planning drawings) for the beam size of the Ahemce project is as follows:        = 3041344,6 mm3 Lower Tee Properties in the Middle of Opening The moment of inertia in the x direction -with the radius of gyration assumed to be zero: The moment of inertia in the x direction -with the radius of gyration assumed to be zero: Table 4 = 3041344,6 mm3 Properties Of Net Section at Middle of Opening The moment of inertia in the x direction -with the radius of gyration assumed to be zero:

Conclusions
Based on the results of the research it can be concluded that:   From the graph above explains the percentage reduction of steel weight will continue to increase when the length of steel usage also increases. This concludes that the use of steel length with steel weight reduction will move linearly. Where in this project with a steel beam length of 1439.27m reduction of steel tonnage was at 19.5%.

Suggestions
Based on the results that have been researched can be given suggestions, including: 1. In calculating the analysis in this study using the standard burdens of existing regulations. To get a more accurate structural analysis, it is recommended to use the burdens that have been imposed on the structure design by the planner (consultant). 2. For further research, analysis of beams can use other types of blocks such as asymmetrical cellular or castellated.

Biographies
Donald Essen was a professor who, today, actively teaches at the Mercubuana University Jakarta with a concentrate on structure. He got a bachelor's degree in civil engineering from the bandung institute of technology in 2002, an Master' degree in engineering specialist from the bandung institute of technology in 2007. He is a member of the Indonesian society of civil and engineers, registered as haki professional engineer, also Class A professional for construction engineering from Dinas Pengawasan dan Penertiban Bangunan DKI Jakarta (DPPB). Currently the director of ESK Enjiniring Company.
Muhammad Nur Rahman was born in Yogyakarta, a special region of yogyakarta on August 9th, 1997. After graduation a vocational high school education in building engineering department continued his undergraduate civil engineering education at mercubuana university jakarta in 2016 to 2020 by compiling the final project is "Efficiency and effectiveness comparative analysis of wide flange beams and cellular beams in a case project united tractor", also active as a staff in building constuction project.