基于混凝土损伤塑性模型的自然通风冷却塔非线性抗震分析

Nonlinear Seismic Response of Natural Draft Cooling Tower Based on Concrete Damaged Plasticity Model

为了明确人字型支柱对自然通风冷却塔抗震性能的影响,基于混凝土损伤塑性模型运用通用有限元软件ABAQUS建立了三维实体模型,并考虑了构造配筋,进行地震波作用下的时程分析。通过对冷却塔抗震薄弱部位支柱部分节点拉伸损伤因子的输出统计进行分析,研究不同跨间距和不同支柱对数的人字型支柱对冷却塔结构抗震性能的影响。研究表明:对人字型支柱冷却塔,缩小跨间距有利于提高结构的抗震性能;在不考虑风阻等其他因素时,本研究所选塔型适当增多支柱对数有利于提高结构的抗震性能。

To study the influence of v-frame column support on the seismic performance of natural draft cooling towers, based on the concrete damaged plasticity model, a three-dimensional solid finite element model was built with using the general finite element software ABAQUS, considering the constructional reinforcement. Then the time history analysis under seismic excitation was carried out. The influence of v-frame column supports with different crotch distance and different number of columns on the seismic performance of cooling tower structure was studied, through the analysis on the statistic result of the tensile damage variable of column nodes at seismic weak parts of cooling tower. It is concluded that： for the v- frame column support cooling tower, the seismic performance is promoted while the crotch distance is reduced; it is benefit for the seismic performance by increasing the number of columns, without considering the effects of other factors, such as wind resistance.