¹ Development in Technology of Porous Materials Research Laboratory: DiTo-Lab, Department of Mechanical Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Mueang, Nakhon Ratchasima 30000, Thailand

² CSP Technology Co.,Ltd. 525/2 Moo 6, Khok Kruat, Mueang, Nakhon Ratchasima 30000, Thailand

³ Department of Railway System, Faculty of Railway Systems and Transportation, Nong-Rawieng, Mueang, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand

⁴ Department of Energy and Air-Conditioning Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Mueang, Nakhon Ratchasima 30000, Thailand

Abstract
The purpose of this research is to analyze the pressure (P) or stress on concrete according to the AASHTO M85 railway platform construction standard. The railway platform formwork was made of SS400 steel. Four different thicknesses (t) of formwork were examined: 3 mm. 4 mm. 5 mm., and 6 mm, respectively. The vertical steel batten (pl) was kept at 20 cm, but there were four horizontal steel battens (ph), i.e., 10, 15, 20, and 30 cm. A finite element method (FEM) was used to solve the solution. The height of column formwork (h) was 900 cm. The initial pressure of liquid concrete (P) was done at the top of the long column (h = 900 cm). As the analysis, it was found that the maximum stress or P was increased as the thickness (t) reduced. Then, the maximum stress of t = 3 cm becomes 406, 440, 485, and 470 MPa for the horizontal steel battens (ph) of 10, 15, 20, and 30 cm, respectively. The formwork was not resistant to the deformation owing to the maximum strength of SS400 being 245 MPa leading to the analyzed result of the present study having higher than the strength of SS400.

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