Human-induced vibration and optimal control of long-span glulam arch bridges
Wang Zhifeng1,2 Li Xianjun1,2 Yi Jin1 Li Qiusheng3
1. School of Civil Engineering Central South University of Forestry and Technology, Changsha 410004, China;
2. Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structure Engineering Material, Central South
University of Forestry and Technology, Changsha 410004, China;3. City University of Hong Kong, Hong Kong 999077, China
Abstract：The modern glued-laminated timber (glulam) footbridge becomes flexible and low-damping due to the use of lightweight and high-strength materials. Although many structural styles have been taken, this kind of bridge is still easy to generate resonance because the fundamental frequency is very close to that of the pedestrian. To study the human-induced vibration performance, comfort assessment and optimal control of the glulam footbridge, human-induced vibration tests and finite element simulation were conducted on a large-scale arch model. The damping efficiency of multiple tuned mass dampers (MTMD) was well predicted and was in good agreement with experimental results. The research results can be applied to the optimal vibration control of the glulam footbridge. It is shown that the peak lateral and vertical acceleration of the glulam footbridge needs to be checked separately under single-or crowd-resonant loads for the comfort limits when the vertical fundamental frequency is less than 3 Hz without load or the lateral fundamental frequency under full load case (2 persons/m2) is less than 1.2Hz. The use of fixed-position centralized loading (in-situ stepping) instead of pedestrian movement to excite the footbridge can simplify the solution procedure and make the results more reliable. The dynamic response of the glulam footbridge in the narrow frequency near the resonance can be controlled within the allowable range when the parameters of MTMDs are optimized by genetic algorithm.
王智丰 李贤军 易锦 李秋胜. 大跨胶合木拱桥人致振动及其优化控制[J]. 土木工程学报, 2021, 54(4): 79-94.
Wang Zhifeng Li Xianjun Yi Jin Li Qiusheng. Human-induced vibration and optimal control of long-span glulam arch bridges. 土木工程学报, 2021, 54(4): 79-94.
