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。 The wind-induced buffeting response of bridge structures is mainly based on the segment model force measurement and quasi-constant chattering theory. However, this method can not be applied to profiled bridges with novel shapes and can not reflect the wind-induced wind response characteristics of structures. Taking the 152.8m span Simao Bridge-shaped steel truss bridge in Haikou as a research background, the paper analyzes the three-dimensional chattering characteristics of the bridge under full wind direction angle based on the results of the full-bridge rigid model test. The feasibility of using a tuned mass damper to suppress the chattering response. The results show that the most unfavorable value of vertical maximum displacement, bearing reaction force and internal force of bar occurs in the orthogonal wind condition whose wind direction and bridge axis are perpendicular to each other, while the maximum acceleration response of vertical bridge appears in oblique wind direction. In addition, the value of structural damping ratio has a great influence on the structural response analysis. The study further verifies that the chattering response of the bridge is not always the most disadvantageous in the cross wind, and the effect of oblique winds should be emphasized in the wind-resistance design of the shaped bridge.