Analysis of comfort design and vibration reduction control of commercial pedestrian bridges of main landmark of South Taihu
The MIDAS Gen software were used to analyze the comfort of pedestrian bridges of the main landmark of South Taihu according to the Technical standard for vibration comfort of building floor structures(JGJ/T 441-2019).The analysis method of comfort design and the influence of load condition,crowd density,external load frequency and stair step on the comfort of pedestrian bridge were introduced in detail.The control effect of TMD damper on the comfort of pedestrian bridge was studied.The analysis results show that the local model can be used for the vertical comfort analysis of the coupling,and the overall model is recommended for the lateral comfort analysis;the pedestrian bridge has obvious small damping ratio and single degree of freedom system vibration characteristics,and the external load frequency is effective for comfort analysis has a decisive influence;the influence of stair step on structural frequency is limited,and its beneficial effects should not be over-considered,but only when large changes are possible and when the structural frequency is far away from the most unfavorable pedestrian frequency range,it is beneficial to increase the structural rigidity;for general pedestrian bridges,STMD can play a good control effect,without MTMD.
comfort analysispedestrian bridgevibration reduction controlsingle tuned mass damperexternal load frequency
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