Check of the bearing capacity of reinforced concrete beams
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Can a 300×800 reinforced concrete beam with a span of 6.5 meters withstand a load of 6.5 tons at the mid-span?
The conditions you mentioned are too simple to make an accurate judgment. 1. Apart from this 6.5-ton load, are there any other loads applied to this beam? 2. What grade of concrete is used for this beam? 3. How much reinforcement has already been used in this beam, and what is the grade of the reinforcement?
It’s a factory building with a frame structure; the span between the two columns is 6.5 meters. A device weighing 6.5 tons is to be placed on the beam between those two columns. I’m not sure if that’s possible. First, could you tell me what kinds of calculations and checks need to be done? Which drawings can show the internal structure of the beam? The reinforcement diagram? Or the formwork diagram?
There is also an arrangement in another direction. It is necessary to check the strength (normal and shear sections), deflection, and cracks. If the beam is a frame beam, seismic effects also need to be considered. Of course, the rebar for the beam is specified in the reinforcement diagram
This post was last edited by jmdc on 2017-11-1 20:27. There are loads at four different positions on the beam; wouldn’t it be safer and simpler to consider the total load from these four positions and apply it concentratedly at the mid-span for verification? In other words, when the total load is equal, is it most unfavorable for the structure if all the loads are concentrated at a single point at the mid-span, and is this assumption the safest for verification? In practical engineering, increasing the safety factor is intended for rough calculations, primarily to ensure safety, with saving materials being a secondary consideration
This post was last edited by jmdc on 2017-11-1 20:59 to verify the beam indicated by the arrow. Are the reinforcement diagrams for beam formwork marked with letters and numbers along the edge of the beam, just like in the photos? I thought each beam would have a cross-sectional view drawn. What do these letters and numbers marked on the edges of the beams mean? Can it be converted into a cross-sectional reinforcement diagram?
Take a look at 16G101; there is a detailed explanation on it. Based on the current reinforcement in this beam, I predict that reinforcing will be necessary to accommodate the additional 6.5 tons of equipment
Can anti-torsion bars and structural bars coexist? Are N4 indicated in the concentrated notation of this beam and G4 indicated in the in-situ notation the same thing?
In-situ annotation takes precedence over centralized annotation
Does it mean there are only 4 structural rebar bars of φ12? When calculating the flexural capacity of the normal section, should the forces on the construction rebar be taken into account, and how should they be handled?