基于粘弹性人工边界的防洪堤动力有限元分析  

Dynamic Finite Element Analysis of Levees Based on Viscoelasticity Artificial Boundary

作　　者：谯雯[1] 刘国明[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《水电能源科学》2012年第1期120-123,共4页Water Resources and Power

基　　金：福建省自然科学基金资助项目(2011J01309)

摘　　要：以大型有限元软件ANSYS为平台,将地震荷载转化为等效节点荷载,通过对比4种不同人工边界条件对地震波的吸收效应,验证了采用粘弹性人工边界在有限元模型时域数值分析方法中的合理性,分析了不同频率下动荷载对结构动力反应的影响,并以福州市闽江防洪堤工程为例,对比分析了在传统的固定边界与粘弹性人工边界两种边界条件下防洪堤的地震响应。结果表明,粘弹性人工边界方法精度高、易于实现、实用性强。Based on ANSYS, seismic loads are transformed into equivalent nodal loads. Compared with the earthquake wave absorption effect under four different artificial boundary conditions, the rationality of viscoelasticity artificial boundary which is applied in the FE time domain analysis method is verified by numerical examples. And then it analyzes the influence of dynamic load on structural dynamic response under different frequencies. Finally, taking the flood levee project of Minjiang River in Fuzhou City for an example, the traditional fixed-boundary and viscoelasticity artificial boundary are adopted to analyze the seismic response. The results show that the viscoelasticity artificial boundary method has the merits of high precision, simple implementation and powerful practicality.

关 键 词：粘弹性人工边界 防洪堤 动力分析 地震波 

分 类 号：TV871[水利工程—水利水电工程] TV312