连续刚构桥长悬臂施工状态抗风临时措施比较

连续刚构桥长悬臂施工状态结构具有大、轻、柔的特点,阻尼下降,因而对风的作用十分敏感,风致振动对结构影响较大。在研究国内外连续刚构长悬臂状态下抗风临时措施应用基础上,针对某海峡大桥长悬臂施工状态提出五种抗风临时措施,建立有限元模型比较不同措施下风槽钢连接的措施能最大程度降低结构响应,大大提高结构抗风性能,这对连续刚构长悬臂施工状态风振控制具有一定的借鉴意义。

Study on wind-resistance temporary measures for continuous rigid frame bridge during long cantilever construction state

Long-span continuous rigid frame bridge is large,light and soft during cantilever construction state,and is very sensitive to wind load by the damping decreases obviously.The vibration induced by wind impact on the structure response greatly.Based on a survey of the application of wind-resistant measures for the continuous rigid frame bridge under long cantilever construction state,5 feasible wind-resistant measures are put forward.The finite-element models of a certain straits bridge are established to calculate the influences of key structural performance applying different wind-resistant measures.It is shown that the displacement of the structure decreases when temporary wind-resistant measures are applied.Structural response decreases most when connecting the two girders by channel steel,contributing a lot to the wind-induced vibration control during cantilever construction.