钢管自密实混凝土加固钢筋混凝土圆形短柱偏压性能研究

发布时间：2018-12-21 15:14

【摘要】：通过9根加固钢筋混凝土圆形短柱(8根钢管自密实混凝土复合加固柱,1根扩大截面加固柱)和1根钢筋混凝土原柱的偏心受压试验,对不同方法加固钢筋混凝土圆形短柱的承载力、刚度和延性进行研究,分析偏心距、钢管壁厚和自密实混凝土强度对复合加固短柱偏压性能的影响。试验结果表明:复合加固短柱的承载力与延性均优于扩大截面加固柱;减小偏心距或增加钢管壁厚均能显著提高复合加固柱的承载力与延性;改变自密实混凝土强度,复合加固柱承载力与延性变化不明显。在确定钢材与新旧混凝土本构关系的基础上,利用纤维模型法对复合加固短柱偏压性能进行参数分析。研究结果表明:增加钢管壁厚或提高屈服强度,N/Nu-M/Mu相关曲线往内收拢;增大外扩截面直径或提高自密实混凝土强度,N/Nu-M/Mu相关曲线往外凸出。
[Abstract]:The eccentric compression tests of 9 reinforced concrete circular short columns (8 self-compacting reinforced concrete filled steel tube columns, 1 reinforced column with enlarged section) and 1 original reinforced concrete column were carried out. The bearing capacity, stiffness and ductility of reinforced concrete circular short columns strengthened by different methods are studied. The effects of eccentricity, steel tube wall thickness and self-compacting concrete strength on the biasing performance of composite reinforced concrete short columns are analyzed. The experimental results show that the bearing capacity and ductility of composite reinforced short columns are better than that of enlarged cross-section columns, and the bearing capacity and ductility of composite strengthened columns can be improved significantly by decreasing eccentricity or increasing the wall thickness of steel tubes. When the strength of self-compacting concrete is changed, the bearing capacity and ductility of composite reinforced columns are not obvious. On the basis of determining the constitutive relation between steel and new and old concrete, the partial compression behavior of short columns strengthened by composite method was analyzed by fiber model method. The results show that when the wall thickness of the steel tube is increased or the yield strength is increased, the N/Nu-M/Mu curve is closed in, and the N/Nu-M/Mu curve protrudes out by increasing the diameter of the expanding section or increasing the strength of the self-compacting 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科研项目(2105004) 教育部博士点专项基金项目(20110141110002)
【分类号】：TU375.3

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