混凝土高坝仿真分析的混合算法

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混凝土高坝仿真分析的混合算法
朱伯芳，侯文倩，李明
(中国水利水电科学研究院结构材料研究所，北京 100038)
摘要：我国混凝土坝最大高度已达300 m，由于应力水平高，高坝应力比较重要，需进行仿真分析，笔
者提出的分区异步长算法。可使仿真计算的时间减少，计算效率提高，本文提出混凝土高坝仿真分析的混
合算法，即在仿真分析中，温度场采用常规有限元算法，应力场采用分区异步长算法。由于温度场计算本
来就比较快，而且计算条件较复杂，采用常规算法，程序较简单，费时也不多。应力场计算量大，采用分
区异步长算法，可有效节省计算时间，本文提出的混合算法兼顾了计算精度与计算效率两方面的要求。
关键词：混凝土坝；温度场；应力场；分区异步长算法；混合算法
中图分类号：TV642．1 文献标识码：A 文章编号：1000—0860(2013)09—0001—03
M ixed m ethod for computing the visco-elastic thermal streses in m ass concrete
ZHU Bofang，HOU W enqian，LI Yue
(China Institute of Water Resources and Hydropower Research，Beijing 100038，China)
Abstract：In low concrete dams，the stresses are SO small that the safety of the dam is primarily dependent on the sliding stabili—
ty．In high concrete dam，the stresses ar6 large，SO the safety of dam is dependent not only on the sliding stability but also on the
stresses of the dam．For a concrete dam with 300 m of height，the duration of construction may be 2～3 years．Due to variations
of ambient temperature of air and water，the process of construction has important influence on the stress state，thus it is neces—
sary to conduct simulating computation of the stress field of the dam which is constructed layer by layer with thickness of 1．5～
3．0 m．For a high concrete dam，the time of computing is rather long．By the method of different time increments in different re—
gions ,2j
， the computing time is reduced but the program is somewhat complicated．For the node i，there is only one variable
in the temperature field，but there are three variable“l、 W in the displacement field，SO the most part of computing time is
used for computing of stresses and only a little part of computing time is used for computing of temperatures．Due to this fact，the
mixed method is proposed in this paper．The temperature field is computed by the common finite element method with good preci—
sion and the stress field is computed by the method of different time increments in different regions wi th high eficiency of compu—
ting． Thus， the mixed method has good precision as well as high efi ciency of computing．
Key words：concrete dam；temperature field；stress field；method of different time increment in different region；mixed method