论文部分内容阅读
大跨度斜拉桥悬臂施工期抖振响应明显,采用谐波合成法对桥梁节点脉动风速时程进行模拟,基于Davenport抖振理论建立了大跨桥梁抖振时域分析方法。针对在建的某大桥主梁单悬臂施工期可能面遭遇台风袭击的情况,分别提出采用下拉索和调谐质量阻尼器(TMD)两种抗风措施方案,并进行减振效果对比分析。研究表明:大跨斜拉桥主梁悬臂施工期梁端风致振动响应较大,应予以重视;综合考虑航道等因素,采用调谐质量阻尼器(TMD)进行大跨度斜拉桥主梁悬臂施工期主梁振动控制效果较好。
The buffeting response of the long-span cable-stayed bridge during the cantilever construction is obvious. The pulsating wind speed time-history of the bridge node is simulated by the harmonic synthesis method. Based on the Davenport chattering theory, the buffeting time-domain analysis method of the long-span bridge is established. In view of the possibility of typhoon attack during the single cantilever construction of the main girder of a bridge under construction, two wind-resistance measures using the pull cable and the tuned mass damper (TMD) are proposed respectively, and the comparative analysis of the damping effect is made. The research shows that the vibration response of the beam-end wind-induced vibration during the cantilever construction of long-span cable-stayed bridge should be paid more attention. Considering the waterway and other factors, the damped mass damper (TMD) The main beam vibration control effect is better.