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In the continuous beam, the beam-span structure produces a downward bending moment under the action of driving load, pedestrians and vehicles are downward ballast the bridge deck, so the downward bending moment generated is called the positive bending moment, because the beam-span structure is a continuous beam, the negative bending moment in the opposite direction can be produced at the bridge support position, the positive bending moment can be eliminated by applying prestress, and the negative bending moment can offset part of the load by applying the opposite prestress, because the negative bending moment is jacked upward, the surface of the bridge span structure may crack at the negative bending moment position, so the negative bending moment position is jacked by the support before the beam span is loaded, so that it can be jacked up in advance and apply the state when the normal force is appliedThis process is called the "forced displacement method", and this test point is a multiple-choice test point, and everyone understands that it is this consciousness.
