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SRC-RC竖向混合结构转换柱型钢延伸高度分析
引用本文:伍凯,薛建阳,赵鸿铁.SRC-RC竖向混合结构转换柱型钢延伸高度分析[J].解放军理工大学学报,2013,0(6):641-647.
作者姓名:伍凯  薛建阳  赵鸿铁
作者单位:1. 河海大学 土木与交通学院, 江苏 南京 210098;
2. 西安建筑科技大学 土木工程学院, 陕西 西安 710055
基金项目:国家自然科学基金资助项目(51208175,50978217);中国博士后基金资助项目(2012M511186);中央高校基本科研业务费专项资金资助项目(2011B07714);教育部高等学校博士学科点专项科研基金资助项目(20096120110005);教育部留学回国人员科研基金资助项目(教外司留
[1108]号);陕西省重点学科建设专项基金资助项目(E01003)
摘    要:为确定SRC-RC竖向混合结构中转换柱的型钢合理延伸高度,保证转换柱具有良好的抗震性能,通过16根试件的低周反复荷载试验,对具有不同型钢延伸高度的转换柱进行了理论分析与性能研究。分析得出了能保证柱底型钢翼缘屈服的型钢最小延伸高度计算公式,保证柱底型钢受弯屈服。试件的位移延性系数随型钢延伸长度的增加呈现先升后降的规律,型钢剪力则表现截然相反的变化规律。型钢截断处的试件弯矩导致上部柱体与下部柱体在该截面存在相互脱离的趋势,纵向受力钢筋在这样的相互转动作用下产生了被拔出的作用效果。配钢率越大,型钢截断处的试件弯矩越大,则纵筋的拔出效应越明显。转换柱的反弯点大致位于0.6倍的柱高,反弯点至柱根部的距离即为型钢在转换柱中的合理延伸高度。型钢延伸高度达到反弯点时,型钢截断处的试件弯矩最小,试件损伤破坏较轻,型钢截断区的内力畸变影响区远离柱顶和柱底,相应区域的混凝土能够保持较好完整性,确保塑性铰具有良好的转动能力,转换柱具有更好的变形能力和抗震防灾能力。

关 键 词:型钢混凝土  转换柱  配钢率  拔出效应  延伸高度
收稿时间:2013-01-10
修稿时间:2013-01-10

Experimental analysis on extension length of shape steel in transfer columns of SRC RC hybrid structures
WU Kai,XUE Jianyang and ZHAO Hongtie.Experimental analysis on extension length of shape steel in transfer columns of SRC RC hybrid structures[J].Journal of PLA University of Science and Technology(Natural Science Edition),2013,0(6):641-647.
Authors:WU Kai  XUE Jianyang and ZHAO Hongtie
Affiliation:1.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
2. School of Civil Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China
Abstract:Mechanical behavior of transfer column in SRC RC hybrid structure was analyzed based on experiment of 16 specimens under low cyclic reversed loading, which is mainly used to confirm the rational extension length of the shape steel in transfer column and ensure the seismic performance of the transfer column. Minimum extension length of the shape steel was confirmed and the calculation method was put forward, which is mainly used to make sure the bend yielding of the shape steel at bottom section. Displacement ductility changes with the extension length increment of the shape steel, enhancing at first and then reducing, and reaching peak value when the extension length gets close to three fifths of column height. But relationship of the steel shear force and the steel extension length is at opposite poles. Moment at section of steel discontinuity leads to pull out effect of the steel bars. The effect promotes with the increment of the moment and the section ratio of the shape steel. Contraflexure point of the transfer column at three fifths of column height, and the distance of contraflexure point to the bottom is the rational extension length of the shape steel. If the shape steel extends to contraflexure point, the section moment of the steel discontinuous section will reach the minimum, damage of concrete will damp down, and deformation ability and the mechanical behavior of the transfer column will be better.
Keywords:steel reinforced concrete  transfer columns  steel ratio  pull out effect  ductility
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