基于参数灵敏度分析和ANSYS优化技术,对静动力试验获得的混凝土斜拉桥的静力位移和模态测试结果进行了修正。修正过程中合理地模拟了边界条件,并对振型进行了分类,模态匹配时只在同类振型中进行。目标函数由静力位移、频率和模态置信标准(MAC)值与相应实测值百分比偏差的平方和进行计算。在桥面施加一层均布荷载后,结构的模态发生了较大变化,用该状态下的模态和静位移测试结果对修正后的有限元模型进行了检验。结果表明:模型修正后不仅参与优化的静力位移和模态计算结果与实测值更加吻合,而且高阶频率也与实测值更加接近,说明修正后的有限元模型能够较准确地模拟实际结构,可作为基准有限元模型。
Abstract
Based on the parameter sensitivity analysis and ANSYS optimization technology, updating of the static displacement and modal test results gotten through static and dynamic test of concrete cable-stayed bridge was done. During updating, a reasonable simulation of the boundary condition was given, vibration mode was classified, and modal match was carried out only in the same type of mode. The objective function was calculated by the sum of squares of percentage deviations between static displacement, frequency, modal assurance criterion (MAC) values and corresponding measured values. After imposing a layer uniform distributed load on the bridge deck, the modal results of the structure changed a lot. The updated finite element model was checked by the test modal and static displacement results of this state. Results show that after the model updating, not only the static displacement and modal results which involve in optimization are more consistent with the measured values, but also the high level frequencies are closer to the measured values. It proves that updated finite element model can accurately simulate the actual structure and can be used as the norm finite element model.
关键词
桥梁工程 /
混凝土斜拉桥 /
灵敏度分析 /
模型修正 /
ANSYS优化
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Key words
bridge engineering /
concrete cable-stayed bridge /
sensitivity analysis /
model updating /
ANSYS optimization
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中图分类号：
U448.27
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脚注
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基金
国家自然科学基金项目(51078134)
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