（郑州大学土木工程学院，  郑州 450001）

［摘要］根据已有的双曲壳体冷却塔局部稳定试验，从模型试验的荷载组合、临界屈曲应力、应力状态、计算参数等多方面对其试验结果进行探讨，并根据再现计算和线性分支点屈曲结果对试验结果进行比较分析。尽管Mungan I的试验结果稳定可靠，但仅以喉部应力状态得到的屈曲判别准则并不能推广至整个壳体，以此得到的安全因子分布也与试验现象相悖。根据其试验结果对试验模型和冷却塔结构的环向临界屈曲应力分别进行修正，修正方法可以较好地反映试验现象和冷却塔结构不同部位的局部稳定水平。

［关键词］双曲壳体冷却塔； 模型试验； 分支点失稳； 局部稳定； 屈曲临界应力

中图分类号：TU317.1, TU271.1       文献标识码：A        文章编号：1002-848X(2015)02-0051-06

Study on local stability  method of hyperboloidal  shell cooling towers

Zhang Junfeng

 (School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China)

Abstract:Based on the  local stability test  of hyperbolic shell cooling tower, test results were discussed from perspectives of model test loading combinations, critical buckling stress, stress state and calculation parameters. Test results were compared and analyzed according to the re\|calculations and buckling results of linear branch points. Although the test results of Mungan  I were stable and reliable, but the buckling judgment criteria only based on the throat stress state cannot be generalized to the whole shell, and the obtained safety factor distribution failed to agree with experimental phenomena. According to the test results, ring critical buckling stresses of the test model and the cooling tower structure were modified respectively. The correction method could well reflect the experiment phenomena and local stability level in different parts of the cooling tower structure.

Keywords:hyperbolic shell cooling tower； model test； bifurcation buckling； local stability； buckling critical stress

*中国博士后科学基金(2014M552016)。

作者简介：张军锋，博士，讲师，Email: brilliantshine@163.com。

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