Analysis of human-induced lateral vibration and lock-in phenomenon on footbridge
WANG Zehan
LI Chenguang
XU Yaqian
CHEN Peng
Abstract：In order to study the human-induced lateral vibration performance of footbridge under crowd load,the theoretical solution to human-induced lateral vibration in the process of pedestrian getting on and off a simply supported bridge was solved by using Duhamel integral,and lateral lock-in conditions and critical number were analyzed.The results show that the lateral vibration response of bridge increases when considering the process of pedestrian getting on and off the bridge in comparison with the state of standing still.When the frequency ratio is 1.0,the lateral acceleration at the mid span is the largest,and the critical synchronous pedestrian number causing lateral lock-in is the smallest.With the increase of total pedestrian number on bridge,the maximum lateral acceleration at the mid span increases linearly,but after exceeding the critical pedestrian number,the increase magnitude rises due to the increase of synchronization probability.The lateral lock-in phenomenon occurs near the critical pedestrian number,and the pedestrian comfort is close to the lower limit of"poor"level.
Keywords：footbridgehuman-induced lateral vibrationpedestrian lateral forcelateral vibration accelerationhuman-bridge interactioncritical pedestrian numberlateral lock-inpedestrian comfort
Publication Date：2024-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 462-470 )