深圳北站东西广场人行天桥舒适度分析

深圳北站东西广场人行天桥位于深圳火车北站站房北侧,联系北站东、西广场。天桥总长约346m,跨度43m,桥面宽12m。针对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,人行步频为1.6～2.4Hz,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,对该天桥进行了人行走舒适度分析,并参考ATC给出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,计算分析得到结构响应较大处,并据此对结构设计进行有针对性的加强,以有效地提高其舒适度。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。

VIBRATION COMFORT ANALYSIS OF THE PEDESTRIAN BRIDGE BETWEEN EAST PLAZA AND WEST PLAZA OF SHENZHEN NORTH RAILWAY STATION

The pedestrian bridge between east plaza and west plaza lies in the north of Shenzhen North Railway Station. It is 346 m long, 12 m in width, 43 m in span. The vibration comfort of long span bridge is studied. A finite element model of a long span bridge is established. Based on the single walking force of IABSE （International Association of Bridge and Structural Engineer）, with the walking frequency 1.6 - 2.4 Hz, a method is proposed considering the random distribution of persona＇s 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. The structures which have the maximum response under the crowd induced loads are strengthened to increase the comfort. The method and comfort performance level can be referred to the vibration comfort analysis of the same kind of long-span bridge structure design.