摘要
河口大桥主跨360 m,为我国地震烈度8度及以上地震区域跨度最大的斜拉桥,设置液体黏滞阻尼器,对于半飘浮体系的斜拉桥是一种十分有效的消能减震装置。介绍了河口大桥液体黏滞阻尼器的设置形式,重点对比分析了两参数阻尼系数C和速度指数α不同情况下结构关键部位的变形和内力效应,并优化了液体黏滞阻尼器的相关参数。计算结果表明:通过对液体黏滞阻尼器阻尼参数的优化,可使地震作用下结构的相对位移和地震力有效降低,并使桥梁的抗震安全性提高。
The main span of Hekou Bridge is 360 m.Hekou Bridge is the longest-span cable-stayed bridge in the earthquake region with an earthquake intensity of 8 degrees and above in China.The setup of liquid viscous damper is a very effective energy dissipation device for the semi-floating cable-stayed bridges.The setup form of liquid viscous damper for Hekou Bridge is introduced.The deformations and internal force effects of the key structural positions under the different conditions of damping coefficient C and the velocity indexαare specially compared and analyzed.The relevant parameters of the liquid viscous damper are optimized.The calculation results show that the optimization of the damping parameter of liquid viscous damper can effectively reduce the relative displacement and seismic force of the structures under the earthquake action,and the seismic safety of the bridge can be improved.
出处
《城市道桥与防洪》
2022年第9期111-113,121,M0011,共5页
Urban Roads Bridges & Flood Control
关键词
Ⅷ度地震区
斜拉桥
液体黏滞阻尼器
参数优化
Ⅷ-degree earthquake region
cable-stayed bridge
liquid viscous damper
parametric optimization
