How to read the centralized on-site annotation map of frame beam reinforcement

The upper and lower numbers of the beam indicate the upper and lower reinforcement, 240*400 indicates the size, φ 8 @ 100/200 (2) indicates the spacing of 200, and the encrypted area 100, (2) indicates.

According to the principle that in-situ labeling takes precedence over centralized labeling, please refer to the explanation on page 22 of 03g10/-1atlas (as shown below):

When the upper and lower steel bars of a beam are all through bars, the centralized marking method is generally adopted, that is, the upper and lower steel bars are separated by semicolons, with the upper steel bar in front and the lower steel bar in the back. If there is a+() sign on the steel bar, the frame steel bar is in brackets, which generally means that the number of stirrups increases. Separators are used for centralized labeling, but not for in-situ labeling.

Extended data frame beam (KL) refers to the beam whose two ends are connected with the frame column (KZ), or the beam whose two ends are connected with the shear wall, but the span-height ratio is not less than 5. Now, in structural design, there is another view about frame beams, that is, beams that need to participate in earthquake resistance. With the rise of high-rise buildings, pure frame structures are less and less common, and the frame beams in shear wall structures mainly participate in earthquake resistance.

References:

Baidu encyclopedia-frame beam