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Experimental Study on the Structural Characteristics of Concrete-Filled Steel Tubular Frames

钢管混凝土框架结构特性试验研究

基本信息

批准号：
08455253
负责人：
MORINO Shosuke
金额：
$ 2.37万
依托单位：
Mie 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 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455253/
关键词：
concrete-filled steel tube column portal frame repeated loading test structural characteristics deformation capacity elasto-plastic behavior Ds factor CFT D_s値繰返し加実験 Ds Ps値

项目摘要

CFT frames consisting of concrete-filled steel tube (CFT) columns and pure steel beams have become very popular these days, since it has been verified by many investigations since 1970's that GET columns have more benefit compared with ordinary steel columns. This is mainly because of the interactive effects between steel and concrete ; the confining effect of the steel tube on the concrete, and the restraining effect of filled-concrete on the local buckling of the steel tube. The behavior of the beam-to-column connections, including new type of diaphragm system, were also investigated experimentally. However, very few frame tests have been done.In order to clarify the elasto-plastic behavior of GET frames under seismic loading, portal frame specimens were tested under constant vertical loads on columns and alternately repeated horizontal load. Experimental parameters were as follows : axial load ratio(0.15, 0.3 and 0.5), width-to-thickness ratio (21 [rank A], 39 [rank C]and 54[rank D] … More ), and yield mode (column-yielding type and panel-yielding type). The cross sections of columns and beam were *-125x125xt and BH-150x125x6x9, respectively, and column height and beam length were 1,000 and 1,500 mm, respectively, The following observations were made from the test results : 1) Hysteretic behavior was quite stable, except the specimens in which fracture occurred at the welding between the column tube and the connection diaphragm ; 2) The local buckling of either the column or the connection panel did not affect much the maximum strength and the deformation capacity ; 3) The maximum strength of frames consisting of D-rank column tube was determined by the local buckling, and it did not reach the value calculated from the formula specified in AIJ Standard, but the strength deterioration was gentle and the behavior was stable ; and 4) The value of Ds was quite well improved by filling the concrete in the column tube, but this effect was not very clear in the case of panel-yielding specimens.Test data of CFT beam-columns and frames were collected from the Japanese literatures published in1972 through 1997, and databases were developed and maintained. Number of test data (test specimens)collected were as follows : 1) Columns : 242 square GFT, lll circular CFT, and total 353 ; and 2) Frames : 184square GFT, 52 circular CFT, and total 236. From these databases, evaluation formulas for the deformation capacity and Ds factor and models for the restoring force characteristics were proposed for both GET columns and frames, and the accuracy of those formulas and models was investigated in view of the test results. Less

由钢管混凝土柱和纯钢梁组成的CFT框架，自20世纪70年代以来，许多研究都证实了GET柱比普通钢柱具有更大的效益，因此近年来非常流行。这主要是因为钢和混凝土之间的相互作用；研究了钢管对混凝土的约束作用，以及填充混凝土对钢管局部屈曲的抑制作用。本文还对梁柱连接的性能进行了实验研究，包括新型的膜片系统。然而，很少进行帧测试。为了明确GET框架在地震荷载作用下的弹塑性行为，对门式刚架试件进行了恒定竖向荷载和交替重复水平荷载作用下的试验。试验参数为：轴向载荷比（0.15、0.3、0.5），宽厚比（21[等级A]、39[等级C]、54[等级D]…More），屈服方式（柱屈服型和板屈服型）。柱、梁的截面分别为*-125x125xt和BH-150x125x6x9，柱高为1000 mm，梁长为1500 mm。试验结果表明：1)除柱筒与连接膜片焊接处出现断裂外，柱、梁的滞回性能基本稳定；2)柱和连接板的局部屈曲对最大强度和变形能力影响不大；3) d级柱筒框架的最大强度是由局部屈曲决定的，没有达到AIJ标准中规定的公式计算值，但强度衰减平缓，性能稳定；4)柱筒内填充混凝土对Ds值有较好的改善作用，但对板屈服试件的影响不明显。CFT梁柱和框架的试验数据收集自1972年至1997年发表的日本文献，并建立和维护数据库。采集的试验数据（试样）数量如下：1)柱：242根方形GFT， 11根圆形CFT，共353根；2)帧数：184个方形GFT， 52个圆形CFT，总共236个。在此基础上，提出了GET柱和框架的变形能力、Ds因子的评估公式和恢复力特性的模型，并结合试验结果对公式和模型的准确性进行了验证。少