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Anonymous users2024-01-23Why is it called a beam and not a board? It is because the cross-section has a height, at least larger than the thickness of the plate, in order to resist the bending moment in the span, it is worthy of being called a beam! Someone came up with a trick called "Dark Beam"!
It's good to hide in the plate and not see it's 'dark', but it's not higher than the section of the plate, so it's not qualified to be called a 'beam'. Of course not! Therefore, the so-called "dark beam", it can only comfort you, thinking that there is steel bar.
To be blunt, it is self-deception! Without a plate of a certain thickness, the steel bar is stuffed with the same downward flexure and cracking!
The subject really hates the beam, so he has to thicken the slab (such as mm), the concrete grade is higher (such as C25, C30), and the spacing of the steel bars is smaller. Wait.
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It should be a brick-concrete structure, right? IF IT IS A FRAME, A SPAN OF 5 METERS GENERALLY REQUIRES A BEAM WITH A HEIGHT OF 60CM. It is not enough to put two 20mm steel bars in the middle to make a dark beam; The thickness of the plate is at least 130mm; Now that it has been poured, it is recommended not to carry too much weight, and it is easy to have problems after a little longer in charge!
The plate thickness is only 100 mm thick, and there is no beam in the middle, so the stiffness is somewhat lacking. The vibration of the floor slab is one of these defects. The dark beam (the same height as the plate) can not provide stiffness constraints, and the section steel beam can be appropriately added to make up for the shortcomings.