等效力学模型下的渡槽动力响应分析

A Dynamic Response Analysis of Aqueducts Based on Theories of Deep Equivalent Mechanical Models

针对大型渡槽在水体晃动作用下的结构动力响应问题,以结构动力学及流体动力学原理简化槽内水体与槽壁间的晃动阻尼作用,建立了渡槽等效力学分析模型,并以EL-centro波横向输入,采用三维有限元及实程分析技术,对不同过水量下结构动位移及应力进行了计算分析。结果表明,渡槽水体晃动动水压力对槽身横向动位移影响较其他方向更为显著;相比附加质量法计算结果,通过等效力学模型计算得到的结构动力响应均有不同程度降低,其中横向减幅最为显著;在大型渡槽结构设计中,考虑液体阻尼效应的等效力学模型相比附加质量法更接近实际情况,为工程实际提供参考依据。

In this paper, aiming at the structure dynamic response of the large-scale aqueducts under water sloshing effects, by struc- tural dynamics and fluid dynamics to simplify the sloshing damping effect between water and slurry wall of the groove, aqueducts e- quivalent mechanical models are established. With 3D FEM and the timing analysis technique, the dynamic displacement and stress under different discharges are calculated and analyzed. Results show that compared with other directions, transverse dynamic dis- placement is more significantly affected by the shaking hydrodynamic pressure of water in the aqueduct. Compared with added mass calculation results, computed by equivalent mechanical model of structure dynamic response are varying degrees lower, and horizon- tal reduction is the most significant of these. In the design of large-sized aqueduct structures, the liquid damping effects of added mass method are taken into account, this paper provides a reference for the practial projects.