一种新的自锚式悬索桥基准索股线形控制方法

A New Method for Alignment Control of Datum Strand of Self-anchored Suspension Bridge

不同于地锚式悬索桥,自锚式悬索桥在基准索股架设过程中,受环境温度影响,基准索线形不仅受主缆伸缩发生变化,由于主缆锚固于梁端,导致主梁伸缩亦会引起基准索线形变化,从而使得基准索线形难以控制。基准索在夜间很容易与环境温度趋于一致,而主梁由于尺寸较大、散热慢很难与环境温度趋于一致,基于此提出一种新的自锚式悬索桥基准索线形调整的方法。研究结果表明:该方法在温度稳定的夜间,可以有效分离基准索线形受基准索自身温差影响和主梁受温差作用影响而引起的变化量;在温度稳定的夜间,主梁受约束的一跨,其基准索线形很容易趋于稳定。

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.