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    江小兵

 

        （江西建工国际工程有限责任公司 ，南昌 330000)

摘   要 ：为及时获取非均匀锈蚀环境下建筑钢混组合梁的性能退化情况 ，通过分析非均匀锈蚀深度对组合 梁有效截面的影响 ，判断组合梁全圆周 、半圆周锈蚀厚度与锈蚀率间的关系 ，并构建组合梁有限元模型。分别 设计四种的锈蚀率 ，模拟分析组合梁试件在受到载荷加载时的承载力变化情况。结果表明： 未锈蚀状态下的试 件强屈比 、延性比以及抗剪承载力均保持较高水平 ，且试件的跨中位移 、混凝土顶板压应变以及钢梁底板拉应 变均保持较低状态。锈蚀率越大 ，试件的承载力越弱 ，锈蚀率较高试件的跨中位移 、混凝土顶板压应变以及钢 梁底板拉应变大幅度增加 ，试件的屈服强度明显低于未锈蚀试件。因此 ，非均匀锈蚀对建筑钢混组合梁的性能 具有显著的负面影响。

关键词：非均匀锈蚀 ；钢混组合梁 ；承载力 ；锈蚀率 ；强屈比 ；跨中位移 ；顶板压应变 ；底板拉应变 

中图分类号：TU375           文献标志码：A            

文章编号： 1005- 8249   (2025)  03- 0164- 05

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .029

Jiang Xiao-bing

(Jiangxi Construction International Engineering Co., Ltd,Nanchang 330000 China)

Abstract: In order to timely obtain the performance degradation of steel-concrete composite beams in non-uniform corrosion environments, this article conducts experimental analysis. By analyzing the influence of non-uniform corrosion depth on the effective cross-section of composite beams, the relationship between the corrosion thickness and corrosion rate of the entire circumference and semicircle of composite beams is determined, and a finite element model of composite beams is constructed. Design corrosion rates of 5%, 10%, and 20% respectively, and simulate and analyze the changes in bearing capacity of composite beam specimens under load loading. The results showed that the strength yield ratio, ductility ratio, and shear bearing capacity of the specimens in the non corroded state remained at a high level, and the mid span displacement, compressive strain of the concrete top plate, and tensile strain of the steel beam bottom plate of the specimens remained low. The higher the corrosion rate, the weaker the bearing capacity of the specimen. The mid span displacement, compressive strain of the concrete top plate, and tensile strain of the steel beam bottom plate of the specimen with a higher corrosion rate increase significantly, and the yield strength of the specimen is significantly lower than that of the non corroded specimen. Therefore, non-uniform corrosion has a significant negative impact on the performance of steel-concrete composite beams in buildings.

Key words: heterogeneous corrosion; steel concrete composite beam; bearing capacity; corrosion rate; strong yield ratio; mid span displacement; top plate compressive strain; floor tension strain

作者简介：江小兵 (1975—) ,  男 ，本科 ，高级工程师 ，研究方向： 土木工程。

收稿日期：2023 - 04 - 21