摘要
在受地震、风等作用激励时,钢-混凝土组合梁桥的安全性与其动力特性密切相关。受限于施工图中一些细节的精确程度,要精确地建立钢-混凝土组合梁桥有限元模型往往存在困难,研究表明,采用近似方法建立的有限元模型模拟结果与桥梁的真实响应之间存在一定误差。为了解钢-混凝土组合梁桥的动力特性,对一座已建成的钢-混凝土组合梁桥开展了环境振动测试,获得了桥梁的各阶模态。建立了精细化的有限元模型,分别采用直接参数修正方法以及基于敏感性的迭代修正方法,对初始有限元模型进行了修正。结果表明:采用迭代法可以提升其有限元模型的精度,在参数选择合适的情况下,直接法和迭代法都可以获得令人满意的结果,但相比于直接法,迭代法通常更为精确。
When been subjected to earthquakes,winds,etc.,the safety of the steel-concrete bridge is directly related to its dynamic property.Limited by the accuracy of details of the construction drawing,it is often difficult to establish accurate finite element model of the steel-concrete bridge.Existing researches revealed that certain error exists when the approximate finite element models were adopted.To investigate the dynamic property of the steel-concrete hybrid bridge,the environmental vibration test of a built steel-concrete bridge is carried out,and the modal parameters of the bridge are obtained.The refined finite element model is established,and the initial finite element model is updated by direct parameter updating process and sensitivity based iterative updating process.The results indicate that the accuracy of the finite element model can be improved by using the iterative method.Under the condition of appropriate parameter selection,both the direct method and the iterative method can obtain satisfactory results,but compared with the direct method,the iterative method is usually more accurate.
作者
法冠喆
FA Guanzhe(Hebi Institute of Engineering and Technology,Henan Polytechnic University,Hebi 456600,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期1398-1402,共5页
Building Structure
