Abstract: A numerical simulation was conducted on 67 reinforced concrete columns, incorporating cementitious grout replacement, under small eccentric compression using ABAQUS finite element software. The study investigated the effects of replacement form, concrete strength, grout strength, and replacement rate on the bearing capacity of these columns. The results indicated that as the cementitious grout strength and replacement rate increased, the bearing capacity of the reinforced column also increased. However, as concrete strength increased, the rate of bearing capacity improvement gradually diminished, with a maximum increase of 13.6%. When the replacement thickness was held constant, applying four-side replacement reinforcement allowed the reinforcement material to provide additional constraints, and restricted the initiation and development of cracks, thereby enhancing the column’s bearing capacity. Additionally, when the replacement rate was constant, using the opposite-side replacement reinforcement method effectively increased the local stiffness of the column, resulting in a more uniform force distribution and improving its load-carrying capacity.

Key words: cementitious grout, replacement, reinforced, small eccentric compression, load-carrying capacity, numerical simulation

摘要： 基于ABAQUS有限元软件对67根水泥基灌浆料置换加固钢筋混凝土柱进行小偏心受压数值模拟分析,研究置换形式、混凝土强度、灌浆料强度、置换率等因素对水泥基灌浆料置换加固钢筋混凝土小偏心受压柱承载力的影响。结果表明,随着水泥基灌浆料强度和置换率的增加,加固柱承载力呈上升趋势;随着混凝土强度的提升,承载力的增长幅度逐渐减小,最大增幅为13.6%;在置换厚度相同的条件下,采用四边置换加固形式,加固材料可提供额外约束,限制裂缝的产生与发展,进而提升柱的承载能力。在置换率相同的条件下,采用对边置换加固形式,可以增强柱体的局部刚度,使其受力分布更加均匀,从而提升柱子的承载能力。

关键词: 水泥基灌浆料, 置换, 加固, 小偏心受压, 承载能力, 数值模拟