《Journal of Structural Engineering 》杂志刊登“利用加速度图解释地震诱发的大坝-水库之间的相互作用”

作  者：Benjamin Miquel, Najib Bouaanani

刊  物：《Journal of Structural Engineering 》，第139卷第9期（2013年9月）， 1608–1617页

关键词：动态地震分析，重力坝，大坝安全，简化方法，流固耦合，库底吸收作用，基础柔性，有限元

摘  要：本文提出一种研究重力坝地震响应的实用有效的新方法，该方法具有以下特点：（1）避免了蓄水水库有限元或边界元的离散性，（2）可以采用标准的有限元软件，而不必具有流固耦合的能力，（3）考虑了大坝和地基的柔性，水压力，及库底吸收作用。该方法包括修改最初输入的地面加速度以获得新的加速度图，也包含了流固耦合的复杂影响。随后将加速度图应用到未蓄水的大坝或者大坝-地基系统，建立了该方法的准确简化公式，并通过不同几何形状的大坝-水库系统的例子验证了它的有效性。将结果与包含流固耦合功能的有限元分析结果进行了比较，计算结果非常一致。新方法通过减少与水库离散相关的建模和计算工作量，提高了重力坝抗震评估的效率，同时保持了常规固体有限元软件在动态分析方面和显示应力、应变、应力分布、其它指标等方面的主要优势。

Accounting for Earthquake-Induced Dam-Reservoir Interaction Using Modified Accelerograms

Authors: Benjamin Miquel, Najib Bouaanani

Journal: Journal of Structural Engineering , Volume 139, Issue 9 (September 2013)，1608–1617

Key words: Dynamic and seismic analyses, Gravity dams, Dam safety, Simplified methods, Fluid-structure interaction, Reservoir bottom absorption, Foundation flexibility, Finite elements

Abstract: This paper proposes a new practical and efficient procedure to investigate the seismic response of gravity dams that (1) avoids the finite or boundary element discretization of the impounded reservoir; (2) can be applied using standard finite-element software not necessarily including fluid-structure interaction capabilities; and (3) accounts for dam and foundation flexibility, water compressibility, and reservoir bottom wave absorption. The proposed technique consists of modifying the original input ground acceleration to obtain a new accelerogram that directly accounts for the complex effects of fluid-structure interaction. This new accelerogram can then be applied to a dam or dam-foundation system without the impounded reservoir. The exact and simplified formulations of the proposed method are developed, and its efficiency is validated through examples of dam-reservoir systems with different geometries. Very satisfactory agreement is obtained when comparing the results to more advanced finite-element solutions including fluid-structure interaction capabilities. The new procedure enhances the efficiency of seismic assessment of gravity dams by reducing the modeling and computational burden associated with reservoir discretization while keeping the main advantages of conventional solid finite-element software in conducting dynamic analyses and providing the resulting stresses, strains, force distributions, and other dam response indicators.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000726

 翻译：翟洁；审核：安鹏