海口司马坡钢桁架异形桥的抗风设计

发布时间：2018-08-31 16:16

【摘要】：桥梁结构风致抖振响应主要基于节段模型测力及准定常抖振理论进行,但这一方法无法适用于结构外形新颖的异形桥梁,也无法反映结构在斜风向下的风致响应特性。该文以跨度152.8m的海口司马坡大桥——异形钢桁架桥为研究背景,基于全桥刚性模型测压试验结果对大桥在全风向角下的三维抖振特性进行了数值分析,并研究了采用调谐质量阻尼器抑制抖振响应的可行性。结果表明:主梁竖向最大位移、支座反力和杆件内力的最不利值发生在风向与桥轴线垂直的正交风工况,而竖桥向最大加速度响应出现于斜风向。此外,结构阻尼比取值对结构响应分析影响较大。该文研究进一步验证了桥梁抖振响应不总是以正交风最为不利,在异形桥梁的抗风设计中应重视斜风效应。
[Abstract]:The wind-induced buffeting response of bridge structure is mainly based on segmental model force measurement and quasi-steady buffeting theory, but this method can not be applied to bridge with novel shape, nor can it reflect the wind-induced response of structure under inclined wind direction. In this paper, the 3-D buffeting characteristics of the bridge under the full wind direction angle are numerically analyzed on the basis of the full-bridge rigid model pressure test results based on the 152.8 m span of Haikou Simapo Bridge-special-shaped steel truss bridge. The feasibility of using tuned mass damper to suppress buffeting response is also studied. The results show that the maximum vertical displacement of the main beam, the most disadvantageous value of the support reaction force and the internal force of the member occur in the orthogonal wind condition of the wind direction perpendicular to the axis of the bridge, while the maximum acceleration response of the vertical bridge appears in the inclined wind direction. In addition, the damping ratio of the structure has a great influence on the structural response analysis. This paper further verifies that the buffeting response of bridges is not always the most disadvantageous of orthogonal wind, and the oblique wind effect should be paid more attention to in the wind-resistant design of special-shaped bridges.
【作者单位】：湖南大学风工程与桥梁工程湖南省重点实验室;广州市市政工程设计研究总院;
【基金】：国家自然科学基金资助项目(编号:51278189) 国家优秀青年基金资助项目(编号:51422806)
【分类号】：U442.59

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