实腹式型钢混凝土十字形柱抗震性能研究_李凯文

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发布时间：2022-04-27

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对 4 个不同轴压比、配钢率、加载方向的实腹式型钢混凝土十字形柱进行了低周反复加载试验，通过观测
试件各阶段的开裂变形及破坏形态，并分析其破坏机理，得到其荷载-位移滞回曲线、骨架曲线、刚度退化、强度衰
减、耗能能力及位移延性系数。通过分析试件的位移延性系数，得到影响实腹式型钢混凝土十字形柱延性的主要
因素。结果表明，实腹式型钢混凝土十字形柱试件在其剪跨比为 3. 25 时发生弯曲破坏形态; 轴压比较高时，试件
强度衰减幅值较小，试件达到极限承载力后刚度退化较快，延性降低; 配钢率加大，试件极限承载力有较大提高，强
度衰减和刚度退化相对平稳; 相同条件下，沿 45°方向加载的试件极限承载力比沿工程轴加载的试件极限承载力
高，且达到极限承载力后刚度退化较快。［关键词］十字形柱; 实腹式型钢; 轴压比; 配钢率; 抗震性能
中图分类号: TU398 + ． 7 文献标识码: A 文章编号: 1002-848X( 2015) 22-0080-05
Ｒesearch on seismic behavior of solid-web steel reinforced high-performance
concrete cross-shaped column
Li Kaiwen1，2，Wang Yuling2，Wan Xin2，Zhang Bo3 ( 1 Center of Environment Civil Engineering，Wuxi 214153，China; 2 Wuxi City College of Vocational Technology，
Wuxi 214153，China; 3 Ｒesearch Institute of Structural Engineering ＆ Disaster Ｒeduction，
Tongji University，Shanghai 200092，China)
Abstract: A series of low cyclic loading tests were carried out on 4 solid-web steel reinforced concrete cross-shaped columns
with different axial compression ratios，steel ratios and loading directions． Through the observation of cracking and failure
modes in each process and analysis of failure mechanism，the load-displacement hysteresis curves were obtained as well as
skeleton curves，stiffness degradation，strength degradation，energy dissipation capacity and displacement ductility
coefficients． The main factors which influence the ductility of the column were studied by analyzing displacement ductility
coefficients． The test results indicate that the column will bend failure with the shear span ratio of 3. 25． When the axial
pressure is relatively high，the attenuation amplitude of the specimen strength is smaller，and the stiffness degradation is
faster while the ductility decreases． When the steel ratio increases，the ultimate bearing capacity of the specimen is
improved，and the strength attenuation is relatively smooth as well as stiffness degradation． Under the same conditions，the
ultimate bearing capacity of the specimen along the loading direction of 45°is higher than that of the specimen along the
loading direction of engineering axis，and the stiffness degradation of the former one is more rapid than the latter one．
Keywords: cross-shaped column; solid-web steel; axial compression ratio; steel ratio; seismic behavior
* 江苏省第四期“333 工程”培养资金省级资助项目( BＲA2012027) 。
作者简介: 李凯文，研究员级高级工程师，Email: 996817275 @ qq．
com。 0 引言
异形柱柱肢与填充墙等厚，避免了框架柱室内
凸出，便于家具布置和室内装饰，改善了建筑观瞻，
符合现代建筑发展方向和潮流。但是钢筋混凝土异
形柱存在轴压比限值过低、延性差等问题。型钢混
凝土异形柱将型钢与异形柱结合起来，扩大了异形
柱的适用范围［1，2］。型钢混凝土十字形柱是型钢混
凝土异形柱体系的一种主要构件形式，已有的研究
成果对型钢混凝土十字形柱的研究主要集中在构件
承载力方面，而对其抗震性能的研究并不多。型钢
混凝土十字形柱的破坏机理、耗能等抗震性能指标
具有显著的特点。型钢混凝土十字形柱是一种新型
组合构件，可缩小构件截面尺寸，提高构件承载力、
刚度和耐久性，克服了传统异形柱结构承载力低、抗
震性能差的弱点，适用于高层建筑及抗震设防烈度
较高地区。本文采用拟静力试验方法对实腹式型钢
混凝土十字形柱进行了试验，并进行相关数值模拟
分析。