Detailing conceptual design of multi-purpose moveable fence near the highway

Yusof, Aminuddin Elmi (2021) Detailing conceptual design of multi-purpose moveable fence near the highway. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The existed moveable fence barrier at exit toll highway Ayer Keroh, Melaka is a ground reinforced cable wire barrier with the length of 2 meter is used to mitigate the vehicle impact at the highway area from any errant vehicles from crossing each opposite lane. However, there are few liabilities with the existed design of the barrier that needs to be improved in the future development of fence barrier system such as ease of handling in moving the fence, reduce the impact force, heavy enough in composition to resist wind pressure, and act as a road divider to prevent reckless driver from making a U-turn. A conceptual design is utilized in this study in analyzing and selecting the best ideal design for the substitution of the existing moveable fence. A 3D geometrical model had been generated from the selection process in the final concept improvement by using Solidwork 2018 and went through simulation process by using Finite Element Analysis (FEA) structural analysis in studying the maximum allowable stress of the created design. The analysis included for the barrier inspection are structural analysis, impact force analysis and wind force analysis. The simulation stages thoroughly examined three types of barriers opening from the final proposed reinforced barrier design. Hence, the results gathered were 10 kN allowable stress limits for maximum opening setup,10 kN and 15 kN allowable stress limits, respectively for medium opening setup and minimum opening setup. For the impact force analysis, few vehicles that are commonly used is chosen to evaluate the predicted force output of each vehicle on the highway condition, and the forces range were from 1.736 kN to 20.833 kN. Meanwhile, the wind force resultant that had been calculated were 390 N from the maximum opening setup of the barrier. The deviation of maximum deformation, maximum stress, and factor of safety were compared to the maximum deformation, material properties and allowable factor of safety at 7.461e-04 m, 2.5e+0.8 MPa and 2, respectively. The required parameters of the expected results settled in allowable range value. As for the conclusion, the generated design for this study of moveable fence near highway has achieved the standard safety guidelines and requirement needed. For future study, the increment of rail thickness should be determined in order to achieve factor of safety above 2 for all load condition of 10, 15, and 20 kN. However, the weight would be an issue for this adjustment. Thus, a cheaper material selection with less weight should be examined if this product were to be commercialized.

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