自立式钢烟囱筒体风荷载作用下应力简化计算

杨诗晴; 赵婧同; 王登峰

doi:10.3724/j.gyjz.G22011908

自立式钢烟囱筒体风荷载作用下应力简化计算

doi: 10.3724/j.gyjz.G22011908

江南大学环境与土木工程学院, 江苏无锡 214122

基金项目:

国家自然科学基金项目（51308258）；江苏省自然科学基金项目（BK20130149）；江苏省研究生科研与实践创新计划项目（SJCX19_0788）。

详细信息

作者简介:
杨诗晴，硕士研究生，主要从事钢结构的研究。

通讯作者:
王登峰，happywdf@126.com。

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出版历程
- 收稿日期: 2022-01-19
- 网络出版日期: 2025-06-07
- 刊出日期: 2025-03-20

Simplified Stress Evaluations of Self-Supporting Steel Chimney Cylinders Under Wind Loading

School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China

摘要

摘要: 采用理论推导与考虑环向焊接初始几何缺陷影响的非线性有限元计算相结合的方法，对自立式钢烟囱筒体在静态风荷载作用下破坏模式和最大应力计算方法进行研究。结果表明：常规体型加劲钢烟囱筒体在风荷载作用下呈现最底部环向焊缝处风致竖向压应力引起的屈曲破坏或最底部迎风线受拉区竖向拉应力达到屈服引起的强度破坏；利用最大竖向拉、压应力修正系数，对按照悬臂构件理论计算得到的最大压、拉应力理论值进行修正即可得到最大应力准确值，且应力修正系数的主要影响参数有筒体总高度、加劲钢烟囱筒体整体环向抗弯刚度、筒体高径比和径厚比。最后基于大量计算数据拟合提出了不同构造钢烟囱筒体最大应力计算公式。
- 烟囱筒体 /
- 风荷载 /
- 强度 /
- 屈曲 /
- 最大应力计算 /
- 非线性有限元 /
- 环向焊接缺陷
Abstract: The failure modes and maximum stress evaluation methods of self-supporting steel chimney cylinders under static wind loading were investigated by the combined method of theoretical deduction and the nonlinear finite element analysis considering the influence of the initial circumferential welding geometrical imperfections. It was found that under the wind loading， the reinforced steel chimney cylinders with normal geometries exhibited two failure modes. One was the buckling failure caused by the wind-induced meridional compressive stresses at the bottom circumferential weld， the other was the strength failure caused by the meridional tensile stresses reaching the yielding strength in the tension area at the bottom windward meridian. The correction factors for the maximum meridional compressive stresses and tensile stresses were produced. The accurate values of the maximum stresses could be obtained by modifying the theoretical values of the maximum stresses calculated according to the cantilever beam theory. The main influencing parameters of the stress correction factors were the total height of the chimney， the overall circumferential bending stiffness of the stiffened steel chimney， the height-radius ratio and the radius-thickness ratio of the chimney cylinder. Based on a great many of computation results， the evaluation formulas of the maximum stresses of the chimney cylinder were proposed.
- chimney cylinder /
- wind loading /
- strength /
- buckling /
- maximum stress evaluation /
- nonlinear finite element /
- circumferential welding imperfection

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参考文献(19)

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