斜风下斜拉-悬吊组合体系桥静风稳定性研究  

Study onthe aerostatic stability of cable-stayed-suspension hybrid bridges under skew wind

作　　者：张新军[1] 胡智勇 孙雷雷 ZHANG Xinjun;HU Zhiyong;SUN Leilei(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2023年第5期523-529,536,共8页Journal of Zhejiang University of Technology

基　　金：浙江省公益技术应用研究项目(LGF22E080018)。

摘　　要：采用斜风作用下结构三维非线性静风稳定性分析程序(3DNASA-SW),以主跨1400 m的斜拉-悬吊组合体系桥设计方案为工程背景,进行了斜风作用下的静风稳定性分析,揭示了斜风作用对斜拉-悬吊组合体系桥静风稳定性的影响。分析结果表明:与法向风情况类似,斜拉-悬吊组合体系桥的静风失稳为主梁竖向弯曲和扭转耦合主导的失稳形态,斜风作用不会影响其静风失稳形态;随风偏角增大,斜拉-悬吊组合体系桥静风失稳临界风速并非呈现如斜风分解法所述的余弦变化趋势,其最小值大多出现在斜风作用情形。程序与斜风分解法计算结果的差异率为-11.7%~2.9%,且以负值为主,斜风分解法将高估斜拉-悬吊组合体系桥的静风稳定性;斜风作用对斜拉-悬索组合体系桥的静风稳定性存在着正负影响,影响率为-4.7%~9.5%,尤其要注意非负攻角下较大风偏角斜风作用的不利影响。为准确预测斜拉-悬吊组合体系桥的静风稳定性,必须采用考虑静风荷载和结构非线性的斜风作用下结构三维非线性静风分析方法。Using a 3D nonlinear aerostatic stability analysis program of structures under skew wind(3DNASA-SW)and taking a 1400 meter cable-stayed-suspension hybrid bridge as example,the 3D nonlinear aerostatic stability analysis of the bridge is conducted and the influence of skew wind on the aerostatic stability of the cable-stayed-suspension hybrid bridge is quantified.The results show that similar to the normal wind case,the aerostatic instability of cable-stayed-suspension hybrid bridges is characterized by the coupling of vertical bending and torsion of the girder,and the skew wind does not affect the aerostatic instability mode.With the increase of wind yaw angle,the variation trend of the critical wind speed of aerostatic instability of cable-stayed-suspension hybrid bridges does not follow the cosine mode as described in the skew wind decomposition method,and the minimum critical wind speed of aerostatic instability mostly occurs under skew wind.The difference between the computational procedure and the skew wind decomposition method is between-11.7%and 2.9%and is mainly negative.The skew wind decomposition method may overestimate the aerostatic stability of cable-stayed-suspension hybrid bridges.The skew wind has positive or negative effects on the aerostatic stability of cable-stayed-suspension hybrid bridges and its influence is between-4.7%and 9.5%.More attention should be paid to the adverse effects of skew wind at a large yaw angle under the non-negative attack angles.In order to accurately predict the aerostatic stability of cable-stayed-suspension hybrid bridges,the method of 3D nonlinear aerostatic analysis under skew wind should be adopted,in which both the aerostatic load and the structural nonlinearities are considered.

关 键 词：斜风 斜拉-悬吊组合体系桥 静风稳定性 三维非线性分析 斜风分解法 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]