How to calculate the ultimate axial force of steel support

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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), if

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. The calculation of axial force is the same. But the specific design calculation is different. In addition to calculating whether the compressive strength of steel support meets the requirements, it also needs to calculate whether the stability meets the requirements. Because of the large slenderness ratio of steel support, it may be unstable.

7. Calculation of preloaded axial force of steel support in deep foundation pit:
firstly, add the preload to zero to calculate an anchor cable tension, which can ensure the stability of foundation pit against overturning, and then multiply it by 70 ~ 95% of the specification to get the preload
the preload is generally less than 450kn, because most of the pile anchor structures are sand, silt, or clay, and the uplift resistance of this stratum and anchor cable is limited. The preload of 450kn means that the design tension reaches 450 / 0.95 ~ 450 / 0.7, which is basically the limit of ordinary anchor cable in this kind of stratum. If it can not meet the requirement, it is necessary to consider densifying the anchor cable spacing
the prestress loss of the anchor cable in the soil layer is amazing. The 10-15% over tension locking required in the specification is not enough. In fact, the prestress in the soil layer is graally lost from the moment when the jack leaks oil. There are many problems, such as the problem of anchorage and soil creep in the anchorage section. The prestress loss after locking is very terrible. So generally, the preload will not be added, because the actual effect is not as big as that of design and locking.