Vibration Response Analysis And Comfort Evaluation Of Large-span Station Hall Of "Building-Bridge Integration" Structure

With the rapid development of railway transportation, large-span station halls are used as a typical structural system in large railway passenger stations. The structure vibration intensity is easily beyond standard limit under pedestrian loads, train loads and large equipments, and people put forword higher requirements in vibration comfort. Therefore, this article analyzed the structure vibration characteristics under different types of load, and researched vibration comfort of long-span station hall with multiple load excitations by field test and investigation of practical annoyance rate.This paper respectively analyzed the structure vibration characteristics caused by vehicle and pedestrian load by two field tests, with the annoyance rate model, new comfort evaluation system of long-span station hall of "building-bridge integration" structure was established to complete standards’ insufficient, which combied with investigation of subjective response to vibration. The research contents are as follows:(1) Field test of human-induced vibration. Based on large-span station hall of Beijing South Railway Station (BSRS) as research background, the floor vibration response signal caused by pedestrian load was collected during the Spring Festival. After the acceleration signal filtering, beam and slab structure intensity were compared, the influence of population density and activity type on structure vibration was researched, and human-induced vibration characteristics of different components were analyzed.(2) Field test of vehicle-induced vibration. Train moving load is loaded on structure model to analyze dynamic time history, according to model analysis result, measure points were arranged on I elevated station hall of BSRS to collect structure vibration response signal caused by passing trains. Time and frequency domain features of structure vibration were analyzed, the influence of train type and load position on structural vibration and vibration intensity of different components were also researched.(3) Investigation of subjective response to vibration. Differences in human subjective response to vibration isn’t only related to the frequency, duration and type, but affected by gender, age, health status, posture, and the working conditions. To study the correlation of each factor and subjective response and to grasp the comfort of large-span station hall, human subjective response to vibration was researched in form of questionnaire survey.(4)New comfort evaluation system’s building of long-span station hall.Summarizing the calculation method, evaluation index and standard limit of structural vibration comfort, and analyzing otherness of limit and applicable places of different countries’ standards, all of which provide theoretical foundation for comfort evaluation. As new structural system, long-span station hall doesn’t have suitable vibration standard to evaluate comfort, suggested range of vibration limits was proposed based on annoyance rate model.