加芯混凝土框架柱的抗震性能研究

【作者】 许婷婷；

【导师】 郭军庆；

【作者基本信息】 长安大学 ， 结构工程， 2006， 硕士

【摘要】 大量震害和试验研究表明，在地震作用下，混凝土框架柱的破坏往往是地震中框架及框架剪力墙房屋发生倒塌的主要原因。提高框架柱的延性性能是防止框架柱破坏的重要手段，可采用的工程做法很多，其中采用钢管混凝土柱和钢骨混凝土柱效果更为显著。本文研究对象是一种较新的框架柱型式—加芯混凝土框架柱。 本文通过1根普通混凝土框架柱和4根加芯混凝土框架柱的伪静力试验，描述了试件的破坏过程，并对各试件的V-△滞回曲线、骨架曲线和位移延性比等试验结果进行了研究，讨论了影响其延性的主要因素。试验和分析结果表明，芯柱核心区面积是影响试件延性及弹塑性变形性能的重要因素；芯柱的体积配箍率和纵筋配筋率对加芯混凝土框架柱的延性及弹塑性变形性能均有影响。在高轴压比下，芯柱采用较大的核心区面积、体积配箍率及纵筋配筋率是保证混凝土框架柱抗震延性的重要措施。 另外，本文采用“条元法”开发了计算加芯混凝土框架柱弯矩—曲率关系的程序。数值计算结果与试验数据吻合较好。更多还原

【Abstract】 Most experiment researches and earthquake damage indicate that under the effect of earthquake, the collapse of building is always due to failure of reinforced concrete columns which can be prevented by improving the ductility of concrete columns. There are many engineering methods to improve the quality of columns. Using Concrete Filled Steel Tubular Columns and Steel Encased Concrete Columns will make more effectiveness. There is a kind of new mode reinforced concrete columns is improved in the article, which is Concrete Frame Columns with Central Reinforcement.Based on the experimental study on one Reinforced concrete column and four Concrete Frame Columns with Central Reinforcement with high axial compression ratio under horizontal cyclic loading, this paper described the process of destroy and studied the test results of each specimen, including V- △ hysteresis curve, skeleton curve and displacement ductility ratio, etc.. , analyzed the major factors affecting the ductility of Concrete Frame Columns with Central Reinforcement. The test and analysis results show that area of core column is major factors affecting both the ductility and earthquake resistance of concrete frame columns; volumetric tie ratio and longitudinal reinforcement ratio of central reinforcement are also affected both the ductility and earthquake resistance of concrete frame columns. Using bigger area of core column, large volumetric tie ratio and longitudinal reinforcement ratio are important measures to ensure good seismic ductility of concrete frame columns with central reinforcement at a high level of axial compression ratio.Moreover, the procedure of moment of flexure and curvature to study the ductility ability of Concrete Frame Columns with Central Reinforcement is worked out. Numerical calculation shows that the result of procedure and testing is concordant.更多还原