Diagnostic analysis of concrete dams based on seasonal hydrostatic loading
Diagnostic analysis of concrete dams based on seasonal hydrostatic loading
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DOI：
10.1016/j.engstruct.2008.04.008
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发表时间：
2008-11-01
影响因子：
5.5
通讯作者：
Massalongo, G.
中科院分区：
文献类型：
--
作者：
Ardito, R.;Maier, G.;Massalongo, G.
本文提出并检验的用于诊断老化混凝土大坝可能损伤的程序可概述如下。混凝土的分区均匀杨氏模量传统上是用于识别由于过去的物理化学过程或/和极端载荷而引起的结构损伤的代表的参数。水库水位的年周期性变化被认为是无损诊断实验的一种廉价而重要的外作用。在大坝的下游面，用雷达仪器测量了大坝从最高水位到最低水位过渡时的许多位移，这是目前大坝工程中有前途的创新。显然，不可忽略的贡献，可测量的位移，由于季节性的热效应考虑到温度测量的时间间隔，通过温度计内的大坝，识别由他们的参数管理简化的热边界条件，时间依赖性表示的截断傅立叶级数超过一年的时间。最后，损伤诊断进行最小化，相对于所寻求的杨氏模量，一批测量和计算的位移之间的差异函数，作为逆分析在线性热弹性上下文中。所提出的方法也通过其随机扩展进行了计算验证。(C)2008爱思唯尔有限公司保留所有权利。
The procedure proposed and examined in this paper for diagnosis of possible damage in aged large concrete dams can be outlined as follows. Zone-wise uniform Young's moduli of concrete are traditionally the parameters to identify as representative of structural damage due to past physico-chemical processes or/and extreme loads. Change of reservoir level with annual periodicity in plant service is considered as inexpensive significant external action for nondestructive diagnostic experiments. Many displacements, concomitant with the transition from highest to lowest level, are measured on the downstream surface of the dam by radar instruments, which at present are promising innovations in dam engineering. Clearly nonnegligible contributions to measurable displacements due to seasonal thermal effects are taken into account by temperature measurements at time intervals through thermometers inside the dam, identification by them of parameters governing simplified thermal boundary conditions, time-dependence expressed by truncated Fourier series over a one-year period. Finally, damage diagnosis is carried out by minimization, with respect to the sought Young's moduli, of a batch discrepancy function between measured and computed displacements, as inverse analysis in a linear thermoelasticity context. The proposed method is computationally validated also through its stochastic extension. (C) 2008 Elsevier Ltd. All rights reserved.