The bottom reinforcement is the main reinforcement at the bottom of the plate. If it is a first-class steel bar, there will be an upward semicircular hook of 180. If it is a secondary or tertiary reinforcement, there will be a 45-degree bend at the end of the main reinforcement, which represents the starting and ending position of the main reinforcement. Gluten is the long main reinforcement on the upper edge of the board, and the end of the board is generally bent at 90 degrees. In the calculation, it extends from the edge of the bearing to an anchorage length in the bearing.

In the reinforcement diagram, the beginning of b indicates the bottom reinforcement; The beginning of the t indicates reinforcement.

Sometimes the design will draw a line to indicate the size of the steel bar, and the drawing does not indicate in which direction the steel bar should be placed. This is very common. There are special instructions in the design specification.

The steel bars on the structural drawing board are indicated by the hooks of the lower stressed steel bars, indicating upward to the left, 180 degrees (grade I steel) or 45 degrees (grade II and above), while the hooks of the upper stressed steel bars indicate downward to the right, 180 degrees (grade I steel) or 45 degrees (grade II and above).