Manual calculation of vertical seismic force of cantilever beam

1. The construction requirement is that the buried length is not less than 1.5 times of the extracted length, which is a general situation. But it's not necessary. You can check the overturning resistance according to the specification. If the conclusion allows shorter buried length, it's OK

how many steel bars are calculated? It needs to know the weight of the wall, the length of the cantilever beam, the cross-section size of the cantilever beam, and the strength of the steel bar and concrete.

2. Cantilever beam is the upper tension, the bottom compression, generally for the upper reinforcement control, the lower general concrete compression can meet, only need to be reinforced according to the structure, to meet the minimum reinforcement ratio. Of course, e to the height limit, the beam section needs to be too small, which means that the reinforcement is calculated in compression.

3. Is it the structural design of reinforced concrete cantilever beam
if so:
carry out structural analysis, sketch, and calculate the internal force, shear force and bending moment of the control section. Draw up the section size, carry out the reinforcement calculation, and arrange the reinforcement according to the calculation results and structural requirements. Draw the construction drawing and complete the design. See concrete structure design specifications and concrete structure design textbooks
for the calculation of reinforcement consumption
then, the structural dimension of each reinforcement, the cutting length and the total mass of each reinforcement are calculated according to the flat marking method. After summarizing, the total amount of reinforcement is obtained.

4. The pressure on an object in the vertical direction of the sliding direction

5. FN is not gravity. According to Newton's third law, FN is a force balanced with gravity in a straight line. They go in the opposite direction. But the size is the same, so I give you an illusion. It seems that it's right to directly substitute the value of gravity in each question. In fact, there is such a step of analysis. The direction of FN is vertical.

6.

In physics problems, FN or n usually stands for supporting force, t generally stands for pulling force, G for gravity, and F for friction

in this topic, you need to draw the stress diagram of the sled, roughly as shown in the figure

horizontal direction: the acceleration of the sled is provided by the resultant force of T2 and friction in the horizontal direction, f = T2 + F

the vertical force is balanced, that is, the gravity is equal to the resultant force of the component forces of the supporting force and the pulling force in the vertical direction, that is, g = FN + T1, and then FN = 400-100sin37 = 340n

Then the friction force formula F is used= μ It's OK to calculate FN

7. It's the pressure on the action surface

8. The sliding friction is f= μ FN, its size can be calculated with this formula< For example, an object on a horizontal table is pushed 5N to the left, but it doesn't move. This is because it is subjected to static friction equal to and in the opposite direction of the thrust (so that the object can keep its balance), that is, a force of 5N to the right
in a word, sliding friction is calculated by formula, while static friction is solved by force analysis and force balance.

9. The formula of sliding friction f = dynamic friction coefficient multiplied by FN, FN is the pressure perpendicular to the sliding surface
when the sliding surface is horizontal, gravity is perpendicular to the sliding surface, FN is equal to gravity
when the sliding surface is perpendicular to the horizontal plane α At the angle, FN is not equal to gravity

10. F -- sliding friction force
FN -- pressure perpendicular to the contact surface, that is, positive pressure
FN μ-- The dynamic friction coefficient, fixed value and size are related to the material condition of mutual friction