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Coupled buffeting response analysis of long-span bridges by the CQC approach

机译：基于CQC方法的大跨度桥梁耦合抖振响应分析

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摘要

Based on the modal coordinates of the structure, a finite-element and CQC (complete quadratic combination) method for analyzing the coupled buffeting response of long-span bridges is presented. The formulation of nodal equivalent aerodynamic buffeting forces is derived based on a reasonable assumption. The power spectral density and variance of nodal displacements and elemental internal forces of the bridge structure are computed using the finite-element method and the random vibration theory. The method presented is very efficient and can consider the arbitrary spectrum and spatial coherence of natural winds and the multimode and intermode effects on the buffeting responses of bridge structures. A coupled buffeting analysis of the Jiangyin Yangtse River Suspension Bridge with 1385 m main span is performed as an example. The results analyzed show that the multimode and intermode effects on the buffeting response of the bridge deck are quite remarkable.
机译：基于结构的模态坐标，提出了一种用于分析大跨度桥梁耦合抖振响应的有限元和CQC（完全二次组合）方法。节点等效空气动力抖振力的公式是基于合理的假设得出的。利用有限元法和随机振动理论计算了桥梁结构的功率谱密度，节点位移和单元内力的方差。提出的方法非常有效，可以考虑自然风的任意频谱和空间相干性，以及对桥梁结构的抖振响应的多模和互模效应。以江阴长江大桥主跨1385 m为例进行了抖振分析。分析结果表明，多模态和跨模态对桥面板的抖振响应具有显着影响。

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