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Experimental Study on the Method to Reinforce Plastic Hinge Region of High Strenght Concrete Filled Steel Tubular Columns

高强钢管混凝土塑性铰区加固方法试验研究

基本信息

批准号：
04650527
负责人：
SAKINO Kenji
金额：
$ 1.28万
依托单位：
KYUSYU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650527/
关键词：
Concrete Filled Steel Tubular Square Column Improvement of the Seismic Resistant Performance Reinforcing by Embedded Circular Steel Tube Axial Shortening Ductility High Axial Compression Tall Building 耐力劣化鋼管コンクリート

项目摘要

We have devised a method for improving seismic resistant performance of concrete filled square steel tubular columns to reinforce by embedding circular steel tube in the column. In order to verify the efficiency of this method, experimental investigation on the columns subjected to alternately repeated lateral force under constant axial compression has been conducted. Eighteen specimens devided into three types according to the length of reinforced region. First type was the partially reinforced columns which have embedded circular steel tube in only the plastic hinge regions with a length of column depth, second type was the totally reinforced columns which have embedded cicular steel tube in the clear height of the column, third type was unreinforced columns which have no circular steel tube. The depth of square steel tube was 200mm and wall thickness was 6mm or 9mm. Concrete strenghth was 260-317kg/cm^2. The variable parameter was the magnitude of constant axial force, which was varied from 0.3 to 0.6 in axial force ratio. In the experiment, all the columns which were reinforced by embedded circular steel tube behaved in a ductile manner and could be prevented from an axial shortening compared with unreinfoced columns. The efficiency of this reinforcng method was remarkable under high axial compression or at large deformation especially, however, only the totally reinforced columns showed good performance under high axial compresssion. In terms of the axial shortening this reinforcing method was more effective than the method to increase the wall thickness of square tube. It can be concluded that by using the proposed method in the structures of concrete filled square steel tubular columns good seismic resistant performance can be obtain.

设计了一种提高方钢管混凝土柱抗震性能的方法，即在柱内预埋圆钢管进行加固。为了验证该方法的有效性，对恒轴压下交替重复侧力作用的柱进行了试验研究。18个试件按加筋区长度分为三类。第一类是部分加筋柱，仅在柱深长度的塑性铰区域预埋圆钢管；第二类是全加筋柱，在柱的明确高度预埋圆钢管；第三类是无加筋柱，不预埋圆钢管。方钢管深度为200mm，壁厚为6mm或9mm。混凝土强度260-317kg/cm^2。可变参数为恒轴力大小，轴力比在0.3 ~ 0.6之间变化。试验结果表明，经预埋圆钢管加固的柱均表现出延性，与未加固的柱相比，可避免轴向缩短。该方法在高轴压和大变形条件下的加固效果显著，但只有全配筋柱在高轴压条件下表现出良好的加固效果。在轴向缩短方面，这种加固方法比增加方管壁厚的方法更有效。结果表明，在方钢管混凝土柱结构中采用该方法可获得较好的抗震性能。