The Research of Weak Interference Principle of Main Cable Displacement for Self-Anchored Suspension Bridge in Stretching Process

The main cable displacement shows the weak interference principle during the stretching construction of self-anchored suspension bridge. When parts of the bridge deck takes off empty, the weak interference of main cable displacement can not use directly. But this principle is still valid after necessarily modifying the main cable displacement. The modified method is that the upward cavity displacement of bridge deck is subtracted by the main cable vertical displacement of suspension centre, so it can be obtained the main cable downward displacement on suspension center.