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。
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.
作者
江小兵
JIANG Xiaobing(Jiangxi Construction International Engineering Co.,Ltd.,Nanchang 330000,China)
出处
《粉煤灰综合利用》
2025年第3期164-168,共5页
Fly Ash Comprehensive Utilization
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
heterogeneous corrosion
steel concrete composite beam
bearing capacity
corrosion rate
strong yield ratio
mid span displacement
top plate compressive strain
floor tension strain
