钢箱梁悬索桥风致响应与静力分析

Wind-induced response and static analysis of steel box girder suspension bridge

风载和静载是桥梁在成桥阶段最常见的两种荷载,而钢箱梁悬索桥在风致作用下的响应尤为剧烈,容易引发安全性问题。为分析其风致响应情况,对某流线型钢箱梁悬索桥进行了数值风洞研究,计算了桥梁结构的三分力系数,并以此为基础分析了桥梁的风致响应,得出了最大的内力与位移,验证了悬索桥的安全性。研究结果表明:流线型钢箱梁三分力系数在-12°~+12°攻角中稳定变化;桥梁在驰振、颤振与涡振中均表现出良好稳定性;全桥在不同荷载工况下的位移与内力均符合规范要求,验证了桥梁结构的安全性与稳定性。

Wind and static loads are the two most common loads on the bridge. The response of the steel box girder suspension bridge subjected to the wind loads is particularly severe, which could cause safety issues. In order to analyze the bridge response influenced by the wind loads, this paper conducted a numerical wind tunnel for a streamlined steel box girder suspension bridge, calculated the three-component force coefficient of the bridge structure. Based on this, the wind-induced response of the bridge was analyzed, the maximum internal force and displacement were obtained, and the safety of the suspension bridge was verified. The results indicate that the three-component force coefficients of the streamlined steel box girder keep stable in-12 ° ~ +12 ° attack angle;the bridge shows good stability in the vibration, tremor and vortex;the displacement and internal force of the bridge meet the requirements of the specifications under different load conditions, therefore, the safety and stability of the bridge structure is reliable.