黏弹性人工边界在坞式闸室结构动力计算中的应用

Application of viscoelastic artificial boundary in dynamic calculation of chamber structure

应用ANSYS通用有限元软件编制黏弹性人工边界的计算程序,通过算例验证该计算方法的可行性。建立基于黏弹性人工边界的坞式闸室结构的动力计算模型,对坞式闸室结构进行固定边界和黏弹性边界下不同边界范围的动力计算分析。计算结果表明:与固定边界相比,黏弹性人工边界有更高的可靠性。在地震动力作用下,闸墙顶部的动力加速度响应最为明显,在闸墙底部拉应力响应最大;闸室底板下部受拉,最大拉应力值大于闸墙的最大应力;地基深度范围取值在2~3倍以上结构底宽时,结构响应已趋于稳定。

We use general finite element software ANSYS to simulate viscoelastic artificial boundary calculation program. The feasibility of the program is verified by an example. The dynamic calculation model of chamber structure is established based on the calculation model.Under conditions of fixed boundary and viscoelastic artificial boundary, dynamic calculation of different boundary range is programmed.The results show： compared with fixed boundary, viscoelastic artificial boundary is more reliable. Under the action of earthquake, acceleration response is most obvious at the top of the lock wall.The maximum value of the tension stress response is in the bottom of the lock wall.The stress in the bottom of the ship lock appears as tension stress in downside, and the maximum tensile stress value in lock bottom is larger than that in the lock wall. The structural responses to stabilize when the boundary range takes 2 - 3 times the size of the lock bottom.