(2) Design of a beam ¹7 ¹7 Main beam | L₁/3 | L,13 || L₁13 L₁ Secondary beam L₁/34₁/34₁/13 L₁ Column The layout of a working platform is shown. The platform slab is precast reinforced concrete slab and is welded to the secondary beam. The span of the main beam L₁-8.4m. The span of the secondary beam L2=6m. The characteristic values of permanent load (including weight of platform slab) and variable (static) load are qGk 4.5kN/m² and qqx=8kN/m², respectively. The steel is Q345. Design the cross sections of secondary beams and main beams of the working platform.

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Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.