多边多腔钢管自密实高强混凝土短柱轴心受压性能试验研究

发布时间：2018-04-05 08:14

本文选题：多边多腔钢管　切入点：高强混凝土　出处：《土木工程学报》2017年01期

【摘要】：以天津高银117大厦巨型柱为原型,按1/20缩尺设计制作7个多边多腔钢管自密实高强混凝土短柱试件。通过轴心受压试验,考察了试件的破坏形态,实测试件的荷载-变形曲线、荷载-应变曲线,研究了试件轴压性能,分析了混凝土强度、钢管壁厚度、有无钢筋笼等参数对试件承载力的影响。研究表明,多边多腔钢管自密实高强混凝土短柱轴心受压全过程大致分为四个阶段;在达到90%极限承载力之前,试件外形无明显变化;提高混凝土强度对试件承载力的提高作用最为明显,有无钢筋笼对试件承载力的影响不明显,增加钢管壁厚度不仅可以提高试件承载力,而且可以显著改善试件延性。基于试验结果,参考国内外相关规范,建立了多边多腔钢管自密实高强混凝土短柱轴心受压承载力实用计算公式,可供实际工程设计参考。
[Abstract]:Based on the giant column of Gaoyin 117 Building in Tianjin, seven self-compacting high-strength concrete short columns of multi-cavities steel tube were designed and manufactured according to 1 / 20 scale.Through the axial compression test, the failure pattern of the specimen, the load-deformation curve and load-strain curve of the measured specimen are investigated. The axial compression behavior of the specimen is studied, and the strength of concrete and the thickness of the steel tube wall are analyzed.The influence of parameters such as steel cage or not on the bearing capacity of the specimen.The results show that the whole process of self-compacting high-strength concrete short columns with multi-cavities is roughly divided into four stages, and the shape of the specimens does not change obviously before the ultimate bearing capacity reaches 90%.Increasing the strength of concrete has the most obvious effect on the bearing capacity of the specimen, but the influence of the steel cage on the bearing capacity of the specimen is not obvious. Increasing the thickness of the steel tube wall can not only increase the bearing capacity of the specimen, but also improve the ductility of the specimen significantly.Based on the test results and referring to the relevant codes at home and abroad, a practical formula for calculating the axial compression capacity of self-compacting high-strength concrete short columns with multi-cavities is established, which can be used as a reference for practical engineering design.
【作者单位】：武汉大学;中建三局集团有限公司;
【分类号】：TU398.9

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