单侧悬挂曲线提篮式拱桥结构人行天桥抗震及减震设计研究

Research on Seismic and Damping Design of Pedestrian Overpass with Single Sided Suspended Curved Basket Arch Bridge Structure

大跨度异形人行天桥跨越能力强、外形美观在景观桥梁中得到了广泛的应用,然而,由于其地震响应比较复杂,提出一种合理减隔震方案是一个急需解决的问题。本文引入了满足人致振动要求的调谐质量阻尼器(Tuned mass damper,简称TMD)建立了减震结构,以厦门健康步道景观提升工程中的人行天桥为背景,通过SAP2000有限元软件建立单侧悬挂曲线提篮式拱桥结构模型,对减震结构进行地震反应分析,并进行抗震验算。结果表明:增设TMD装置的减震结构不仅改善了结构的振动,且满足人致振动要求,又有效提高了结构整体抗震性能。

The large-span special-shaped pedestrian overpass has been widely used in landscape bridges because of its strong spanning capacity and beautiful appearance.However,due to its complex seismic response,it is an urgent problem to propose a reasonable seismic reduction and isolation scheme.In this paper,the tuned mass damper(TMD)which meets the requirements of human induced vibration is introduced to establish the damping structure.Based on the pedestrian overpass in Xiamen healthy footpath landscape improvement project,the structural model of single sided suspension curved basket type arch bridge is established through SAP2000 finite element software.The seismic response of the damping structure is analyzed and the seismic checking calculation is carried out.The results show that the damping structure with TMD device not only improves the vibration of the structure to meet the requirements of human induced vibration,but also effectively improves the overall seismic performance of the structure.