Structural dynamic response reduction factor under crowd Bounce load
CHEN Jun1, 2, REN Jingya1, WANG Lei1
1 Department of Structural Engineering, Tongji University，200092, Shanghai, China
2. State Key Laboratory of Disaster Reduction in Civil Engineering, 200092, Shanghai, China
Abstract：Bounce means up-down movements of human body with two feet remaining on ground, and it is a typical rhythmic human induced dynamic load during audiences celebrating in a concert or sport game. Here, the response reduction factor (RRF) was defined as a ratio between structural responses considering and not considering crowd bouncing synergy. Actual measured records of crowd bouncing loads were used to study the variation laws of RRF versus person number, structural frequency and structural damping ratio. A corresponding design curve and expression were proposed. For practical application, the structural dynamic response under a single person Bounce load was firstly calculated with the response spectrum method. This response was multiplied with the total crowd weight, and multiplied again with the corresponding RRF after considering modal shapes’ effects to realize the fast calculation of structure dynamic responses under crowd Bounce loads considering crowd bouncing synergy. The rationality of the proposed RRF and the above mentioned calculation procedure was verified with numerical examples.
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