Abstract
The test object is the grandstand of the Suzhou Industrial Park Stadium. First, the structure was tested for dynamic characteristics, including natural frequency, mode test, and damping test. Then, the structure was subjected to a human-induced vibration response test. Lastly, the finite-element modeling of the structure was carried out, and the simulated and measured values were compared. The test results of the dynamic characteristics of the structure are consistent with the calculated values, and the finite-element modeling of the structure was accurate and reasonable. The natural frequency of structural modal test areas 1 and 2 met the 3 Hz limit vibration specified by JGJ/T 441-2019, and the second-order resonance frequency was still within the range of pedestrian load frequency, which may still cause comfort problems. Test results show that the presence of people increases the damping effect of the structure.
Highlights
With the improvement of building material performance and building technology, the style of building structure is showing increasing diversity
The dynamic characteristics and crowd load response of the stadium stands in Suzhou Industrial Park were tested on-site, combined with the numerical calculation of the corresponding finite-element model, and the following conclusions were obtained: (1) The test results of the dynamic characteristics of the structure were consistent with the calculated values, indicating that the finite-element modeling of the structure was accurate and reasonable
(2) The measured vertical fundamental frequency of structural modal test area 1 was 3.750 Hz, and that of modal test area 2 was 3.950 Hz, which was greater than the limit of 3 Hz given by Technical standard for human comfort of the floor vibration [7]
Summary
With the improvement of building material performance and building technology, the style of building structure is showing increasing diversity. Demand for building functions has led to the development of building structures towards larger spans and lighter weight [1,2,3,4] This gives rise to comfort problems, especially for large buildings (large ballrooms, high-speed railway stations, etc.), long pedestrian bridges, and buildings with large overhanging spaces [5,6,7,8,9,10,11,12]. For cases that do not meet the comfort requirements, consideration should be given to changing the structural arrangement to improve the structural modal frequency or using multiple tuned mass dampers (MTMDs) for vibration damping control [3,18,19,20]. For a structure using MTMD, the acceleration response calculation of the structure before and after damping should be evaluated to reasonably select the tuned mass damper (TMD) parameters and arrangement position
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