Dynamic characteristics of a large-span steel space frame-glass composite floor

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (13) : 195-202.

WANG Zhihao1，HUANG Youkun1，LI Xiaoke1，XU Ke2，Chen Yin1

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Abstract

Ambient vibration tests for a large-span steel space frame-glass composite floor were conducted. The identified vertical dynamic characteristics of the floor were compared with its finite element (FE) model simulation results. Here, a sophisticated FE floor modeling method was proposed for vibration comfort evaluation. The study showed that a historic site protection visit building adopts large-span steel space frame-glass composite floor’s special open hole, cantilever and suspension etc. structure forms to make the site entrance visit area become the most unfavorable vibration position, there exist typical coupled vibrations among various floors; it is necessary to distinguish the large-span steel space frame-glass composite floor’s sophisticated FE model (in weak vibration state) from the load-bearing ultimate model (in strong vibration state)’s live load value; the actual stiffness contributions of structural layer floor and architectural surface to the whole floor system are simulated, and the modal damping ratio can be 2.78% ~ 2.98%; the effects of human-floor interaction on the whole floor system’s dynamic characteristics and response should be considered appropriately.

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large-span steel space frame-glass composite floor / ambient vibration test / sophisticated FE model / dynamic characteristics / modal parameter identification

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WANG Zhihao1，HUANG Youkun1，LI Xiaoke1，XU Ke2，Chen Yin1. Dynamic characteristics of a large-span steel space frame-glass composite floor[J]. Journal of Vibration and Shock, 2018, 37(13): 195-202

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