The arrangement of the main and secondary beams of a platform is shown in the right...

 

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The arrangement of the main and secondary beams of a platform is shown in the right figure. The floor is a precast reinforced concrete slab, firmly welded to the secondary beams. The standard value of permanent load (including the self-weight of the floor) is 15kN/m² and the standard value of variable load is 20kN/m². The steel is Q390, the electrode is E50, and it is welded by hand. Task 1: Select two cross sections (I-section and box section) for the secondary beam, a and check the strength and stiffness of the beams. Task 2: Design the main beam (calculation diagram of the main beam is shown in the left figure) Task 3: Summarize your experience and suggestions for the selection of beam sections and stiffener arrangements from this project. F12 F F 2000 F + + 2000 2000 22 12000 2000 2000 2000 F12 Calculation diagram of the main beam 4500 4500 Secondary beam Main beam 2000 2000 2000 2000 2000 2000 12000 Diagram of main and secondary beams The arrangement of the main and secondary beams of a platform is shown in the right figure. The floor is a precast reinforced concrete slab, firmly welded to the secondary beams. The standard value of permanent load (including the self-weight of the floor) is 15kN/m² and the standard value of variable load is 20kN/m². The steel is Q390, the electrode is E50, and it is welded by hand. Task 1: Select two cross sections (I-section and box section) for the secondary beam, a and check the strength and stiffness of the beams. Task 2: Design the main beam (calculation diagram of the main beam is shown in the left figure) Task 3: Summarize your experience and suggestions for the selection of beam sections and stiffener arrangements from this project. F12 F F 2000 F + + 2000 2000 22 12000 2000 2000 2000 F12 Calculation diagram of the main beam 4500 4500 Secondary beam Main beam 2000 2000 2000 2000 2000 2000 12000 Diagram of main and secondary beams

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