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为了研究复杂结构体系中不确定性结构参数对其动力特性的影响,采用响应面法,选择出若干个对因变量影响较大的随机变量参与响应面拟合。采用该方法对大连湾自锚式吊拉协作体系桥动力特性进行了敏感因子分析。计算分析表明,自锚式吊拉协作体系桥主梁质量密度的随机性对其动力特性最为敏感,同时缆索体系和主梁结构参数的随机性对斜拉桥低阶模态的敏感性较强。所做工作能为自锚式吊拉协作体系桥结构受力分析提供参考,同时为复杂结构体系不确定性参数的随机分析提供相应的思路。
In order to study the influence of the uncertain structural parameters on the dynamic characteristics of the complex structural system, the response surface method was used to select several random variables that greatly influenced the dependent variable to participate in the response surface fitting. This method is used to analyze the dynamic characteristics of Dalian Bay self-anchored suspension cooperative system bridge. The calculation and analysis show that the randomness of bridge girder mass density is the most sensitive to the dynamic characteristics of the self-anchored cable-stayed bridge and that the randomness of the cable system and the main girder structural parameters is more sensitive to the low-order mode of the cable-stayed bridge . The work can provide a reference for the mechanical analysis of the bridge structure of the self-anchored suspension system and provide the corresponding ideas for the stochastic analysis of the uncertain parameters of the complex structural system.