该广场联系人行天桥位于深圳火车北站站房北侧,联系北站东、西广场.本文针对联系人行天桥大跨度桥面的振动舒适度问题,建立天桥的整体有限元模型,以IABSE建议的单人步行激励为基础,人行步频1.6Hz～ 2.4Hz之间,考虑行人起步相位随机分布,通过多点输入时程分析方法求得结构的加速度响应.据此,对该天桥进行了人行走舒适度分析,并参考ATC给出了天桥的人行舒适度性能水准.分析研究表明,该天桥具有适宜的人行舒适度,结构设计对结构响应较大处进行了针对性的加强,可更有效地提高舒适度.所采用的计算分析方法及天桥人行舒适度性能水准对同类型大跨天桥结构设计具有一定的参考价值.%The pedestrian bridge between east plaza and west plaza lies in the north of Shenzhen North Railway Station. A finite element model of a large-span bridge is established to study the problem about vibration comfort of large-span bridge. Based on the single walking force of IABSE (International Association of Bridge and Structural Engineer) and the walking frequency of 1.6Hz ~ 2.4Hz, a method is proposed to get the acceleration response of structure considering the random distribution of crowd initial phase angle. Then the vibration comfort of the bridge is analyzed by a multi-support excitation and time history analysis method. The comfort performance level is given according to ATC ( Applied Technology Council). The results show that the bridge has right comfort. Some structural position of maximum response under the crowd-induced loads are strengthened to increase the comfort. The calculating method and comfort performance level could be referred by the vibration comfort analysis of the same kind of large-span bridge structure design.
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