Design Analysis of Overhead Crane for Maintenance Workshop

This research aimed to study the design of the overhead crane of a small fishing boat maintenance factory according to the building and functional requirements of the project based on the ASME B30.2-2005 Standard. The results of the study showed that the design of the runway with steel structure BS: 5950: 2000 grade s460 provided vertical and horizontal deflection values of 4.96 and 16.62 respectively that did not exceed the allowed deflection. It is strong enough for use in construction when the stresses on the beam bridge were analysed by the finite element program compared with the strength of the reinforced steel providing a safety value of 1.83.


Introduction
Utilization of the maintenance buildings possesses specification for the overhead crane which has less than 600 square meters in size, 20 meter wide bridge beam and 30 meter running distance as shown in Fig 1 .The height of the crane to the floor does not exceed.15 meters and the crane must be able to carry a load of 20 tons and the design must comply with the requirements.The structure must be strong, stable, and cost-effective.

Runway Deflection Analysis
The vertical and horizontal actual deflection was calculated from (1) and (2), respectively, which was acceptable only if the result was no more than the permitted deflection as calculated from equation ( 3) Horizontal Actual Deflection = FR L^3/(48E Iyfc) Permitted Deflection = Span / 600 (3) The design of the beam cross-section used for deflection analysis is as follows: The figure is shown in Fig. 3:    In processing, the finite element method with the solid work simulation program was employed in the 8 following main steps:

Strength Analysis of Bridge Beam Box
(1) Check the integrity of the CAD file (2) Define the boundary conditions of the grip and support the actual working conditions.
(3) Determine the force load to determine both position and size.The value derived from the calculation.
(4) Specify the type of material as standard iron steel with BS: 5950: 2000 grade 460.
(5) Determine the type and shape of the elements that are appropriate for the complex structure work.
(6) Create mesh especially using the fine mesh in the complex structure area.(7) Use the workpiece command and then the obtained results is analyzed for the accuracy.

Result of Design Analysis of Runway Overhead Crane
The results obtained from the calculation of the overhead crane design were shown in Table 6.Fig. 5-6 showed the position of the analysis.Fig. 7-10 showed the maximum bending moment.The forces acting on the support points were shown in Fig. 11-12.

Results of Strength Analysis of Bridge Beam Box
The stress analysis of the beams with finite element method [1][2][3][4][5][6][7][8][9][10][11][12][13][14] is shown in Fig. 13.The maximum stress of 338 MPa gives a safety value of 1.83.Crane design analysis, which satisfies ASME B30.2-2005 standards, is highly accurate and reliable.Therefore, the cost of construction can be reduced to 1.83., and provides 20 tons of cranes as desired.It is suitable for use within designated areas.The data of this design will be employed to construct the overhead crane of the local fishing boat maintenance workshop.

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Primary data designated in the design

Table 2 .
Main Section

Table 3 .
Top Section

Table 4 .
Forming a Compound Crane Girder Section.

Table 5 .
Equivalent Area Axis & Plastic Modulus of the Combined Section.

Table 6 .
Result of Design Analysis