静力风荷载作用下大跨度钢拱桥极限承载力分析  

Ultimate Load Carrying Capacity Analysis of Long-Span Steel Arch Bridge Under Static Wind Load

作　　者：黄瀛 HUANG Ying(JSTI Group Co.,Ltd.,Nanjing 210017,China)

机构地区：[1]苏交科集团股份有限公司,南京210017

出　　处：《现代交通技术》2020年第1期29-33,共5页Modern Transportation Technology

摘　　要：随着拱桥跨径的不断增大,其非线性效应愈加显著,因此,等效静力风荷载作用下钢拱桥的极限承载力分析引起了广泛的关注。以主跨450m的广东省肇庆西江大桥为例,利用ANSYS有限元软件研究结构极限承载力分析中的非线性效应、静风失稳风速以及等效静力风荷载作用下拱桥的极限承载力。结果表明:与几何非线性相比,材料非线性对拱桥极限承载力的影响较大;静力风荷载会对拱桥的活载稳定系数产生较大的影响。在风速较大区域设计建造大跨度钢拱桥时,应兼顾考虑几何非线性和材料非线性对拱桥极限承载力的影响。With the span length of arch-bridge increasing, ultimate load carrying capacity analysis of steel arch bridge under e- quivalent static wind load arouses the attention of bridge engineers. The geometric and material nonlinearities may greatly af- fect the analysis results. This paper investigates the influence of geometric and material nonlinearities in the ultimate load car- rying capacity analysis of Zhaoqing Arch Bridge with main span 450 m, calculates the critical wind velocity and the ultimate load carrying capacity under equivalent static wind load. Results from the numerical simulation indicated that the material non- linearities may influence the results larger than the geometric nonlinearities. Moreover, it can be concluded that wind loads re- sult in significant reduction in the ultimate load carrying capacity when applied wind loads become large. The design and con- struction of long-span steel arch bridge in large wind speed area need not only consider geometric nonlinearity, but also consid- er material nonlinearity.

关 键 词：静力风荷载 钢箱拱桥 极限承载力 几何非线性 材料非线性 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]