Subway construction steel support axial force design value of KN/m, the construction to be converted into MPa, how to calculate?
The prestressing force can not be applied according to the design value of the axial force of the steel support, and the prestress value (KN) shall be pressed according to the design.
I also do the subway, I come to you to say, not so complicated, steel support axial force required to use the jack and the oil meter is calibrated, in the calibration report has a formula. P=a*F+-b, A.B are calculated after the calibration coefficient. According to the formula can be calculated. Generally speaking, there are two formulas for the two jacks.
If:The design of prestress value is 300KNJack cross-sectional area of 0.017671 square metersApply prestress = Design prestress value / Jack cross-sectional area =300/0.017671/1000=1.70MPa
This is related to the type of Jack you use, you see (or measure the size of the calculation) Jack area of the square to the meter
