ULTIMATE STRENGTH AND DEFORMABILITY OF CONCRETE FILLED AND COVERED STEEL TUBE COLUMNS WITH SEVERAL MATERIAL COMBINATIONS

几种材料组合的钢管混凝土填充和覆盖混凝土柱的最终强度和变形能力

基本信息

批准号：
08455262
负责人：
NAKAMURA Yuji
金额：
$ 1.41万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The purposes of this research are to obtain the ultimate strength and the plastic deformability of concrete filled and covered steel tube columns with several material combinations and to seek the optimum material combinations. Ordinary and/or high strength concrete (Fc=240kg/cm^2 and Fc=500kg/cm^2) are used for covered and filled steel tube columns. And columns have circular tubes with large or small diameter, or wide flange sections at the center respectively.Test specimens are sub-assemblages of cruciform consisted of columns and beams. They are loaded with repeated bending moments, which corresponds to severe seismic loadings, as well as vertical loading, 30% of axial force capcity of the columns simultaneously.It is obtained from the experiment results that the generalized additional strength equations of columns can evaluate the ultimate strength of concrete filled and covered steel tube columns satisfactorily, even using high strength concrete. However, for columns using wide flange sections, it overestimates usually, and the ultimate strength of concrete outside of hoop reinforcement should be considered to be fc'=0.2fc. Moreover, the plstic deformability of columns with concrete filled and covered steel tube with larger diameter and with smaller diameter were judged to be considerably high, which corresponds to FA to the structural rank I and FB to the structural lank respectively defined with Japanese Building Standard Law.Consequently, as the conclusions the ultimate strength of concrete covered and filled steel tube columns can be estimated with the generalized additional equations satisfactorily. And these columns are ductile to seismic forces.

本研究的目的是获得几种材料组合的钢管混凝土钢管柱的极限强度和塑性变形能力，并寻求最佳材料组合。覆盖钢管柱和填充钢管柱采用普通和/或高强混凝土（Fc=240kg/cm^2 和 Fc=500kg/cm^2）。柱子有大、小直径的圆管，或中心有宽翼缘截面。试件是由柱和梁组成的十字形子组合体。它们承受重复的弯矩，相当于严重的地震荷载，同时还承受竖向荷载，即柱轴力承载力的30%。从试验结果表明，柱的广义附加强度方程可以评估柱的抗拉强度。即使使用高强度混凝土，钢管混凝土填充和覆盖钢管柱的极限强度也令人满意。但对于采用宽翼缘截面的柱子，通常会高估，应考虑箍筋外混凝土的极限强度fc'=0.2fc。此外，大直径和小直径钢管混凝土填充柱的塑性变形能力被认为相当高，分别对应于日本建筑标准法定义的结构等级I的FA和结构等级FB因此，作为结论，用广义附加方程可以满意地估计钢管混凝土柱的极限强度。这些柱对地震力具有延展性。