How to calculate pre axial force of rigid support

1. According to the fact that the strain of reinforcement is equal to that of concrete support.

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3. This has something to do with the type of Jack you are using. You can check (or calculate) the cross-sectional area of the jack. In square meters, the prestressing force can not be applied according to the design value of the steel support axial force, but should be applied according to the design value of the prestressing force (generally in KN)
suppose:
the designed applied prestress value is 300KN
the sectional area of the jack is 0.017671 M2
the applied prestress = the designed applied prestress value / sectional area of the jack = 300 / 0.017671/1000 = 1.70mpa

4. The axial force of diagonal brace is 1 / sin of that of straight brace with the same spacing, which is multiplied by the length of steel brace α Times α Is the angle between the support axis and the crown beam axis)
Axial Force: in architecture, the internal force that coincides with the axis of the member is called the axial force, which is represented by the symbol FN. When the member is in tension, the axial force is tension, which points away from the section; When the member is compressed, the axial force is compression, which points to the section (in building curtain walls, especially in frame supported curtain walls, it is also expressed as eccentric compression and eccentric tension). It is usually stipulated that the tension is represented by a positive sign and the pressure is represented by a negative sign.

5. The axial force of steel support can be applied in three times, each time in equal proportion (1400 / 3)
the axial force of steel support should be calculated,
not pre added,
but 200kn.

6.

For example, for a column, the structural resistance obtained by the parameters of material and so on is the design axial force

now test the column, first add some force, see, this force can be called pre axial force. Of course, different situations have different explanations

the calculation method is also different. The design pre axial force (the force per linear meter of straight brace along the line direction) is multiplied by the length of steel brace, and the axial force of diagonal brace is 1 / sin of straight brace with the same spacing α Times

Generally, the preload is not more than 450kn, because the pile anchor structure is mostly composed of sand, silt or clay, and the uplift resistance of this stratum and anchor cable is limited< br />