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研究了非线性系统的等价线性化动力分析方法以及大跨悬索桥非线性特性的表征,采用移动荷载模型分析了润扬长江大桥悬索桥在移动交通荷载作用下的非线性动力响应特征,包括单车过桥、车队单向过桥、车队双向过桥以及基于实测交通流量的连续车流过桥等4种工况。结果表明,在60～120km/h的正常行车状态下,车速对结构动力响应的影响并不显著;车重与结构挠度响应呈近似正比例关系;在连续车流作用下,动力响应最显著的部位为跨中区段;在不连续车流作用下,动力响应最显著的部位为L/8～L/4区段。本文的结论可以为大跨悬索桥梁的构造优化设计、空间疲劳分布效应研究及日常养护工作提供参考。
Equivalent linear dynamic analysis method of nonlinear system and characterization of nonlinear characteristics of long-span suspension bridge are studied. The nonlinear dynamic response characteristics of suspension bridge of Runyang Yangtze River Bridge under moving traffic load are analyzed by moving load model, Bridge, the team one-way bridge, the team two-way bridge and based on measured traffic flow continuous flow through the bridge and other four conditions. The results show that under the normal driving condition of 60 ~ 120km / h, the influence of vehicle speed on the dynamic response of the structure is insignificant. The relation between the vehicle weight and the structural deflection response is approximately proportional. Under the continuous flow, the most significant part of the dynamic response is In the middle section, under the action of discontinuous flow, the most significant part of dynamic response is L / 8 ~ L / 4 section. The conclusion of this paper can provide references for the structural optimization design of large-span suspension bridges, the study of spatial fatigue distribution effects and routine maintenance work.