Calculation of Ultimate Shear Strength of High Strength Concrete Column Reinforced with Concrete Filled Steel Tube

介绍了以圆钢管为钢骨的劲性高强混凝土柱的剪切性能试验的试验概况,在此基础上研究了它的斜截面承载力计算方法。在计算时,采用了将构件分成几个独立的抗力机构,相互叠加构成构件抗力体系的计算方法的计算模型。进而利用剪切性能试验得到的数据结果进行参数回归,得到以圆钢管为钢骨的劲性高强混凝土柱的斜截面承载力计算公式。General situation about shear experiments of high concrete columns reinforced with concrete filled steel tube is presented,and method for calculating ultimate shear strength of the columns is discussed based on the experimental results.Shearing resistant mechanism of the columns can be made up of several simple individual shearing resistant mechanisms,and then the formula for calculating ultimate shear strength can be established by superposing the actions of these shearing resistant mecnanisms.In the further analysis,the unknown parameter in the formula is regressed using the test data of shear experiments

NUMERICAL ANALYSIS OF LOAD-MOMENT INTERACTION DIAGRAM FOR HIGH STRENGTH CONCRETE COLUMN REINFORCED WITH CONCRETE FILLED STEEL TUBE

介绍了以圆钢管为钢骨的劲性高强混凝土柱的抗震性能研究的试验概况,在此基础上采用条带有限元法进行了弯矩-轴力相关曲线的数值分析,计算结果与试验结果大致吻合,可以用于确定该类柱在偏压状态下的极限承载力。The general situation of earthquake-resistant behavior experiments of high concrete columns reinforced with concrete filled steel tube is presented.Based on the experimental results,the numerical analysis of load-moment interaction diagram for the columns is completed using strip finite element analysis method.The calculation results are in basic agreement with those of the experimental values,so the numerical analysis method can be used to determine the ultimate bearing capacity of the columns under eccentric compression

Ultimate Strength of High Strength Concrete Columns Reinforced with Concrete Filled Steel Tube Under Axial Compression and their Reliability Analysis

为了探求一个合理的设计公式来计算带圆钢管的劲性高强混凝土柱在轴压下的极限强度,完成了包含13个短柱试件在内的轴心受压试验以研究该类柱在轴压下的破坏模式和极限强度.试验结果表明,在荷载作用下,直到荷载接近极限值时,柱中钢管、纵向钢筋以及混凝土三者之间的纵向应变基本上是协调的,计算结果与试验结果吻合良好,因此可以采用叠加原理来计算带圆钢管的劲性高强混凝土柱在轴压下的极限承载力.此外,分析了该极限承载力计算公式的可靠度水平.分析结果表明,该承载力计算满足GB50068-2001对构件可靠指标的要求.This paper aims at developing a rational design formula to predict the ultimate strength of high strength concrete columns reinforced with concrete filled steel tube (HSCCRST) under axial compression. In order to investigate the failure mode and the ultimate strength of the columns under axial compression, experimental tests of 13 specimens under axial compression were performed. Test results showed that the longitudinal strain of the steel tube, the longitudinal reinforcement, and the concrete in the column were all compatible under loading until the load applied was close to the ultimate load. Therefore, the ultimate strength of HSCCRST could be calculated in the principle of superposition. In addition, the reliability level of the columns under axial compression designed following the proposed formula was investigated. Analysis results indicated that the reliability indexes of the columns designed following the proposed formula satisfied the demand of Unified Standard for Reliability Design of Building Structures (GB 50068-2001), National Standard of the People's Republic of China.国家自然科学基金资助项目(50378034

Experimental research on behavior of high strength concrete column reinforced with concrete-filled steel tube under axial compression

介绍了包括带圆钢管的劲性高强混凝土轴压短柱、钢管高强混凝土短柱以及普通高强混凝土短柱在内共13个试件的轴心受压试验,主要研究了带圆钢管的劲性高强混凝土轴压短柱的破坏特征、延性和极限承载力.研究结果表明,核心圆钢管的存在,改善了高强混凝土短柱的轴压性能;短柱中的混凝土与钢管能够共同工作直到破坏,其极限强度可以用叠加原理计算.Experiments of 13 specimens including high strength concrete columns reinforced with concrete-filled steel tube,high strength concrete-filled columns steel tube and high strength concrete columns are presented.Based on the test results, the failure feature,ductility and ultimate capacity of high strength concrete column reinforced with concrete-filled steel tube are investigated.Research results show that the steel tube in the core improves the behavior of high strength concrete column under axial compression.In addition,the research results also show that the concrete can work in a good cooperation with the steel tube in the column under axial compression until the column is failure,so the ultimate capacity of high strength concrete column reinforced with concrete-filled steel tube can be calculated in the principle of superposition.高等学校博士学科点专项科研基金资助项目(98014124