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非均勻銹蝕對建筑鋼混組合梁承載力退化的影響分析

Analysis of the Influence of Non - uniform Corrosion on the Degradation of Load - bearing Capacity in Steel - Concrete Composite Building Beams

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江小兵

（江西建工國際工程有限責(zé)任公司，南昌 330000)

摘要：為及時獲取非均勻銹蝕環(huán)境下建筑鋼混組合梁的性能退化情況，通過分析非均勻銹蝕深度對組合梁有效截面的影響，判斷組合梁全圓周、半圓周銹蝕厚度與銹蝕率間的關(guān)系，并構(gòu)建組合梁有限元模型。分別設(shè)計四種的銹蝕率，模擬分析組合梁試件在受到載荷加載時的承載力變化情況。結(jié)果表明：未銹蝕狀態(tài)下的試件強(qiáng)屈比、延性比以及抗剪承載力均保持較高水平，且試件的跨中位移、混凝土頂板壓應(yīng)變以及鋼梁底板拉應(yīng) 變均保持較低狀態(tài)。銹蝕率越大，試件的承載力越弱，銹蝕率較高試件的跨中位移、混凝土頂板壓應(yīng)變以及鋼梁底板拉應(yīng)變大幅度增加，試件的屈服強(qiáng)度明顯低于未銹蝕試件。因此，非均勻銹蝕對建筑鋼混組合梁的性能具有顯著的負(fù)面影響。

關(guān)鍵詞：非均勻銹蝕；鋼混組合梁；承載力；銹蝕率；強(qiáng)屈比；跨中位移；頂板壓應(yīng)變；底板拉應(yīng)變

中圖分類號：TU375 文獻(xiàn)標(biāo)志碼：A

文章編號： 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

作者簡介：江小兵 (1975—) , 男，本科，高級工程師，研究方向：土木工程。

收稿日期：2023 - 04 - 21