【摘要】 输煤栈桥作为矿区煤炭运输系统的重要通道，因大跨度和高架式钢桁架结构的广泛应用而易在外部激励作用下产生显著振动。早期建设的栈桥受限于技术条件，其动力特性研究不足，导致输送机运行引发的结构振动问题日益突出，长期振动将加速连接节点疲劳损伤，威胁结构及人员安全。依托陕西榆林市某矿区101跨河栈桥工程，基于SAP2000建立三维有限元模型，计算并分析了不同激振源作用下的结构响应。结果表明：栈桥的主要振源包括托辊偏心、煤料不均及胶带悬垂冲击激振力；偏心托辊布置位置对最大响应分布具有显著影响；煤料不均激振力随竖向不均匀系数增大而增强，且纵向不均匀系数在(1,1.5)范围时响应呈复杂波动；带煤工况下的振动响应远大于空载工况，随输送煤量增加，胶带悬垂度和冲击力幅值同步增大。更多还原

【Abstract】 As an important passage of the coal transportation system in mining areas, the coal conveyor trestle bridge is prone to significant vibration under external excitation due to the widespread use of large-span and elevated steel truss structures. The early construction of the trestle bridge was limited by technical conditions and insufficient research on its dynamic characteristics, resulting in increasingly prominent structural vibration problems caused by conveyor operation. Long term vibration will accelerate fatigue damage to the connecting nodes, threatening the safety of the structure and personnel. This article relies on the 101-river crossing trestle bridge project in a mining area of Yulin City, Shaanxi Province, and establishes a three-dimensional finite element model based on SAP2000 to calculate and analyze the structural response under different excitation sources. The results indicate that the main sources of vibration for the trestle bridge include roller eccentricity, uneven coal material distribution, and impact vibration force from tape suspension. The placement of eccentric rollers has a significant impact on the maximum response distribution. The uneven excitation force of coal material increases with the increase of vertical unevenness coefficient, and the response shows complex fluctuations when the vertical unevenness coefficient is within the range of(1, 1.5). The vibration response under coal carrying conditions is much greater than that under no-load conditions. As the amount of coal transported increases, the suspension degree of the belt and the amplitude of the impact force increase synchronously.更多还原