There is no very accurate display of the difference between these kinds of beams on the Internet, in fact, we want to figure out the difference between them is also very simple.
The key to our discussion of the difference is that in order to better calculate, we analyze the force analysis, anchorage, specific role, and flat atlas.
1.Foundation Connecting Beams:
In fact, the function is very simple, and the following figure also illustrates it, that is, it simply connects the independent foundations together, and there is no substantial force requirement. Therefore, his rebar requirements are also very low. It is only necessary to anchor the rebar into the corresponding foundation
His support can be a cushion cap on both sides, a pillar or a wall.
We have also seen the properties in **, in the software, it is actually with the frame beam, and the frame beam can be changed to the basic connection beam by modifying the construction category.
Since the rebar has low stress requirements, it only needs to be anchored to the cushion caps on both sides（11g101-3 p92）
2.Cap beam:
The cap beam is actually a kind of cap, and he is on an equal footing with the normal cap. The lower part is directly supported on the pile foundation.
It is impossible for him to mount on another cap or pillar, because he is the cap, which is already the lowest load-bearing structure.
From the perspective of force, it is also the same as the normal cushion cap, which directly transfers the upper load to the pile foundation below.
Therefore, his rebar will only be related to itself, and will not be anchored to other structures (22101-3 p2-44 45).
3.Frame beams:
I don't need to explain this, but the one we see the most is the frame beam, which transfers the upper load to the vertical structure (column, wall), and the column wall then transfers the load to the cap beam, cap, foundation beam, etc.
So his supports can be walls and columnsHis rebar also needs to be anchored into the support
The following figure is the force analysis diagram of the frame beam, and we can see that only in the middle of the span about 1 3 positions are the bottom of the tension.
The other parts (1 3 parts near the bearing) are all tensile at the top.
We all know that the steel bar is a tensile construction, so the **tension** needs the steel bar,Naturally, in the upper part of the negative reinforcement of the support 1 3 is the position where the reinforcement is most needed, which is exactly where the negative reinforcement of the support is located (as shown in the figure below).
4.Foundation beams:In fact, the force of the foundation beam is just the opposite of the frame beam, and the foundation beam directly transfers the upper load to the foundation, so it will bear the upward reaction force of the foundation. The upward reaction force in this aspect actually corresponds to the downward force of the upper load of the frame beam, but it is said that the direction is opposite!
The foundation beam is naturally negative reinforcement on the supportLower 1 3The position where reinforcement is most needed is the position of the negative reinforcement of the foundation beam support (as shown in the figure below).
Therefore, his bearing negative reinforcement is in the lower part of the negative reinforcement 1 3 part of the support (as shown in the figure below) (22101-3 p2-25).
The 03 specification has foundation connecting beams and ground frame beams, but in the 11th specification, the ground frame beams and foundation connecting beams are integrated into foundation contact beams, which are marked with the code JLL.
11G101-3 50 pp.
16g101-3 pp. 52.
In Glodon software, you can directly select the frame beam to draw, and select the type as the foundation connection beam.
Generally speaking, the underground layer (including the foundation layer) will involve: foundation connecting beam (03 specification), ground frame beam (03 specification), foundation contact beam (11 16 specification), bearing platform beam (11 16 specification); The above-ground floor will involve: connecting beams, floor frame beams, roof frame beams, non-frame beams, tic-tac-toe beams, frame support beams, floor frame flat beams (16 specifications), frame connecting beams (16 specifications);
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