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Elastic-Plastic Behavior and Evaluation of Structural Performance of Frames composed of Core Steel Composite Columns and RC Beams

核心钢组合柱和RC梁框架的弹塑性行为及结构性能评价

基本信息

批准号：
13650631
负责人：
SAKAI Junichi
金额：
$ 1.6万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650631/
关键词：
Seismic Performance Column Collapse Encasing core steel Axial Compressive load of core steel Cruciform frame 変形能力支圧破壊載荷実験十字形架構試験体柱の軸力比崩壊形式柱の小構造種別

项目摘要

The author has been investigated the structural design method of frames composed of core steel composite columns and reinforced concrete beams (RC beam). In general reinforced main bars of RC beam are arranged densely at the beam-to column connection panel, so encasing core steel of column member through into beam connection is difficult. As one of method of making clear up the difficulty, cutting and encasing core steel out of beam-to-column connection can be thought. In order to study the elastic-plastic behavior of cruciform frames composed of core steel composite columns and reinforced concrete beams, an experimental work was carried out. In order to make clear the behavior of frames under large axial load, the axial load of column was applied 0.4 times of ultimate compressive strength of column cross section. Experimental parameter is different of encasing core steel into column members, (1) cutting core steel at the connection panel and no reinforcement of core steel (A-Type), (2) cutting core steel at theconnection panel and welding of steel plate at the end of core steel in order to prevent bearing collapse of concrete of beam-to-column connection (B-Type), and (3) encasing core steel through into connection panel (C-Type).It was clear by carrying out the experimental work that : Specimen of C-Type showed stable behavior up to the story drift R =4/100 rad. Specimen of B-Type showed almost same behavior up to the story drift R=2.5/100, and the axial compressive load of core steel of this specimen kept 1.5 times of one of A-Type specimen. Under the large axial load on the column, welding of steel plate at the end of core steel is useful on the point of reinforcing at the connection panel.

本文研究了钢芯组合柱与钢筋混凝土梁（RC梁）框架的结构设计方法。一般情况下，钢筋混凝土梁在梁柱连接板上密集布置钢筋，使柱构件的核心钢通过梁连接围接较为困难。作为解决困难的方法之一，可以考虑在梁柱连接中切割和包围核心钢。为了研究由核心钢组合柱和钢筋混凝土梁组成的十字形框架的弹塑性性能，进行了试验研究。为了明确框架在大轴向荷载作用下的受力性能，柱的轴向荷载为柱截面极限抗压强度的0.4倍。围芯钢入柱构件试验参数不同，(1)在连接板处切芯钢，不加芯钢钢筋（a型），(2)在连接板处切芯钢，在芯钢末端焊接钢板，以防止梁柱连接混凝土承载倒塌（b型），(3)围芯钢穿过连接板（c型）。实验结果表明：c型试件在层间位移R= 4/100 rad前表现稳定，b型试件在层间位移R=2.5/100前表现基本一致，其芯钢轴压荷载保持为a型试件的1.5倍。在柱上较大的轴向荷载作用下，在连接板的配筋点上，在核心钢端部焊接钢板是有益的。