关键词: 桥梁工程, 自锚式悬索桥, 基准索股, 梁端约束, 线形控制

Abstract: Different from earth-anchored suspension bridge, during the erection of the datum strand, the datum strand alignment of self-anchored suspension bridge was not only changed by the expansion of the main cable due to the environmental temperature, but also changed by the expansion of the main beam due to the anchoring of the main cable at the beam end, which made the datum strand alignment difficult to be controlled. The datum strand was easy to be consistent with the ambient temperature at night, and the main beam was difficult to be consistent with the ambient temperature due to its large size and slow heat dissipation. Based on this, a new method for alignment adjustment of the datum strand of the self-anchored suspension bridge was proposed. The research results indicate that the proposed method has the following characteristics: during the night when the temperature is stable, the variation of the datum strand alignment caused by the temperature difference of the datum strand itself and the main beam can be effectively separated; during the night when the temperature is stable, for a constrained span of main beam, the datum strand alignment tends to be stable easily.

Key words: bridge engineering, self-anchored suspension bridge, datum strand, restriction on the beam end, alignment control