中文摘要：

针对某三塔斜拉桥的工程问题,通过三维风致响应数值分析和气弹模型风洞试验分别对该桥最大双悬臂施工状态在设计基准风速下的抖振响应进行了对比研究,结果表明：2种方法得到的结构抖振响应较为接近,验证了数值计算方法的准确性;悬臂端部竖向抖振响应较大,应采用设置临时墩方法对其进行控制.通过三维风致响应数值分析方法对该桥最大双悬臂施工状态下不同临时墩布置位置对抖振响应的影响进行了研究,并同无临时墩结果进行比较,结果显示：临时墩使长悬臂端部竖向抖振极值响应大幅度下降,扭转位移略有降低,侧向位移却有增大;随着临时墩位置的改变,双悬臂结构的竖向和侧向抖振极值响应变化均很小,扭转位移的波动幅度为27%,但扭转位移均值不大,最大双悬臂结构抖振极值响应对临时墩布置位置不敏感,当临时墩距桥塔达到一定距离时,可参考结构抗风之外如河床地貌、经济等因素合理布置.

英文摘要：

Based on the numerical analysis and wind tunnel tests on the buffeting performance of the longest double-cantilever construction state of a triple-tower cable-stayed bridge, it was found that the results obtained via the two methods coincide well, which verified the accuracy of the numerical meth- od. Moreover, considerable vertical buffeting response occurred, so for the buffeting control of the bridge, a temporary pier was employed. The buffeting performances of the structures with different layouts of the temporary pier were compared with each other as well to those of the structure without a temporary pier. The results show that the existence of the temporary pier decreases the amplitudes of vertical displacement distinctly, and the torsional displacement also shows some decrement while the lateral displacement increases to some extent. With the change of the layout of the temporary pier, the vertical and lateral displacements vary a little. Although the variation of the tortional dis- placement reaches 27 %, the mean value of tortional displacement is small. So the buffeting responses are generally not sensitive to the layout of the temporary pier. When the temporary pier is enough far away from the tower, the layout of the temporary pier can consider non-wind-resistant factors such as the topography of riverbed and so on.