钢管混凝土加固钢筋混凝土方形截面偏压短柱受力性能分析

发布时间：2018-01-03 02:22

本文关键词：钢管混凝土加固钢筋混凝土方形截面偏压短柱受力性能分析　出处：《建筑结构学报》2016年12期 　论文类型：期刊论文

【摘要】：对8根钢管混凝土加固柱试件和1根未加固钢筋混凝土方形截面短柱试件进行偏心受压试验,试验结果表明:采用钢管混凝土加固法能显著提高原柱的承载力和变形能力;随着钢管壁厚的增大,加固柱试件的承载力和变形能力显著提高;随着后浇混凝土强度的提高,加固柱试件的承载力有所提高,但延性降低。在试验研究的基础上,采用通用有限元软件ANSYS对加固柱试验进行全过程受力分析,与试验结果对比后发现,二者吻合良好,有限元分析的承载力最大相差为6%。有限元分析结果表明:弯曲内侧受压的后浇混凝土会受到明显的约束作用,最大约束应力可达10MPa,而弯曲外侧的后浇混凝土受拉,不受约束作用;钢筋混凝土原柱各处混凝土受到的约束力大致相同,在2.0~2.5 MPa之间;由于外套圆钢管对受压侧原柱混凝土和后浇混凝土提供有效约束作用,其最大应力可明显高于其单轴抗压强度。
[Abstract]:The eccentricity compression tests were carried out on 8 specimens of reinforced concrete filled steel tube reinforced columns and 1 specimen of short square column with unreinforced reinforced concrete section. The test results show that the bearing capacity and deformation capacity of the original column can be significantly improved by using the method of concrete-filled steel tube (CFST) reinforcement. With the increase of the wall thickness of steel pipe, the bearing capacity and deformation capacity of the specimens strengthened with the steel column are improved significantly. With the increase of the strength of post-cast-in-situ concrete, the bearing capacity of the reinforced columns is increased, but the ductility is reduced. The general finite element software ANSYS is used to analyze the whole process of the strengthened column test. The comparison with the test results shows that the two methods are in good agreement with each other. The maximum difference of the bearing capacity of finite element analysis is 6. The results of finite element analysis show that the post-cast concrete subjected to bending inner compression will be restrained obviously, and the maximum restraint stress can reach 10 MPA. On the other hand, the post-cast concrete outside the bend is not constrained by tension. The binding force of reinforced concrete columns is about the same, ranging from 2. 0 to 2. 5 MPa. The maximum stress of jacket steel tube can be obviously higher than that of uniaxial compressive strength because it provides effective restraint to the compressive side of the original column concrete and the post-cast concrete.
【作者单位】：武汉大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51078294) 中央高校基本科研业务费专项资金项目(2015210020201)
【分类号】：TU375
【正文快照】： 0引胃目前,针对钢筋混凝土(RC)的加固修复方法主要有增大截面加固法1,FRI加固法和包钢加固法等。国内外研究者已对其进行了研究,如Miller5和Sezen等采用了圆钢管混凝土加固法、增大截面加固法和FRP加固法三种加固方法对RC圆形截面柱进行加固,通过对比研究发现,圆钢管混凝土

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