关于强风侵袭下的桥梁抗毁性评估仿真

摘要

Traditional assessment method for destroy-resistance of bridge under strong wind invasion always ignores to analyze bending resistance property of bridge component,which leads to unsatisfactory assessment effect.In order to solve the problem,based on finite element analysis,a new assessment method is presented in this article.Finite element model of the destroy-resistance of bridge is built.Simulation and mesh generation are carried out for each component of bridge.Capacity spectrum curves,requirement spectrum curves of bridge structure and transformation relationship between them are calculated.The finite element model is solved.The bending resistance property of bridge component is analyzed synthetically.Thus,the assessment of destroy-resistance of bridge is completed.Simulation results show that the method can reflect variation of wind pressure and wind speed of bridge structure under strong wind.Simulation results agree with the measured data.%对强风侵袭下的桥梁抗毁性的评估,能够有效提高恶劣天气下桥梁的安全性.对桥梁抗毁性进行评估,需要对桥梁构件进行网格划分,分析桥梁构件的抗弯性能,完成强风侵袭下桥梁抗毁性的评估.传统方法建立桥梁抗毁性评价体系,将各个桥梁构件元素的叶斯网络节点进行设置,但忽略了桥梁构建抗弯性性能的分析,导致评估效果不够理想.提出一种基于有限元分析的桥梁抗毁性评估方法,建立强风侵袭下的桥梁抗毁性有限元模型,对桥梁的各个构件分别进行了模拟和网格划分,计算了强风侵袭下的桥梁结构能力谱曲线、需求谱曲线以及二者之间的转换关系;对建立的强风侵袭下桥梁有限元模型进行求解,综合分析了桥梁构件的抗弯性能,实现了强风侵袭下桥梁结构损毁程度的评估.实验结果表明,所提方法能够有效反映强风侵袭下桥梁结构的风压变化和风速变化,仿真数据与实测数据的比对结果相吻合.