摘要
李仙江特大桥主桥为(62.4+127.6+420+127.6+62.4)m双塔五跨平行索面钢混组合梁斜拉桥,半漂浮体系,塔高最高达250m,主梁采用双边工字型开口组合梁截面。通过1:50主梁节段模型风洞测振、测力试验对成桥状态主梁的涡振、颤振及驰振稳定性加以检验及优化,并测试得到主梁的静风三分力系数供后续设计使用。结果表明:原始主梁设计断面在+3°风攻角下出现的明显的竖向涡激共振现象,通过采取增设风嘴等气动措施后,主梁断面的涡振、颤振以及驰振稳定性经检验均满足规范要求。研究成果可为同等规模桥梁类似主梁断面的气动措施选择提供参考。
The main bridge of Lixianjiang Grand Bridge is a double-tower five-span parallel cable-face composite beam cable-stayed bridge with a span combination of(62.4+127.6+420+127.6+62.4)meters.It features a semi-floating system with the tallest tower reaching up to 250 meters.The main beam adopts a bilateral I-shaped open-section composite beam profile.The vortex,flutter,and galloping stability of the main beam in the completed state were tested and optimized through wind tunnel vibration and force tests on a 1:50 scale model of the main beam sections,and the areostatic force coefficients of the main beam were obtained for subsequent design use.The results indicate that the original main beam design section exhibited a significant vertical vortex-induced resonance phenomenon at a wind attack angle of+3°.After implementing aerodynamic measures such as adding wind fairing,the vortex vibration,flutter,and galloping stability of the main beam section have were tested and found to meet the requirements of the specifications.The research findings can provide a reference for the selection of aerodynamic measures for similar main beam sections of the similarly-sized bridges.
作者
袁警
尹开川
夏支贤
陈星
YUAN Jing;YIN Kai-chuan;XIA Zhi-xian;CHEN Xing(Broadvision Engineering Consultants Co.,Ltd.,Kunming 650041,China)
出处
《价值工程》
2024年第9期88-91,共4页
Value Engineering
关键词
组合梁斜拉桥
开口截面
节段模型风洞试验
涡振抑制措施
抗风性能
composite beam cable-stayed bridge
open cross-section
section model wind tunnel test
suppression measures of vortex-induced vibration
wind-resistant performance
