青岛体育中心综合训练馆大跨混凝土楼盖振动舒适度测试与分析

Modal testing and vertical vibration serviceability analysis of large-span pre-stressed concrete floor of Training Hall in Qingdao Sport Center

通过建立竖向振动舒适度长期监测系统,测试了青岛体育中心综合训练馆大跨度混凝土楼盖在主体结构完成、木地板铺设完成、整体结构完成等4个典型阶段的动力特性;实测了在单人行走、多人齐步行走、多人跳跃、多人随机及正常比赛训练等多种激励情况下结构楼面的加速度反应,并与有限元分析及英国混凝土协会建议的计算方法(CCIP-016)进行了比较。结果表明,大跨度楼盖具有典型的模态密集特性,本例中木地板的刚度贡献可以忽略。人致激励的类型和行走路线对楼盖动力响应影响显著。CCIP-016的动力响应计算结果比实测值小。上述结果可为全面了解大跨度预应力楼盖的实际动力性态、验证现有计算方法的合理性及类似建筑的舒适度评估提供依据。

A permanent vibration serviceability monitoring system was installed on the post-tensioned concrete floor of Training Hall in Qingdao Sport Center.The measurement results for three distinct construction phases,from completion of main floor structure to fully open to the public,were summarized in terms of variation of dynamic properties and dynamic response due to different human-induced excitation like single person walking,multi-people marching and multi-people jumping.Furthermore,the dynamic properties of the floor were also computed through finite element analysis and simplified hand-calculation approaches suggested by CCIP-016.It is found that the large-span floor has very closely-spaced modes of vibration,and the contribution of wooden floor to the total floor stiffness is neglectable in this case.Type of human-induced excitation and the walking route has a significant effect on the floor responses.The dynamic responses calculated by CCIP-016 are smaller than that of the field measurements.Observations in this study are of significance for understanding the real dynamic properties of large-span post-tensioned floor,for verifying the applicability of current design method,and for being a reference for vibration serviceability assessment of similar structures.