带T形钢的内置钢管混凝土组合柱轴压性能研究  

Research on axial compression performance of steel tube with T-shaped steel reinforced concrete column

作　　者：王朋[1,2] 李龙堂 史庆轩 王斌[1,2] WANG Peng;LI Longtang;SHI Qingxuan;WANG Bin(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2023年第2期37-49,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52178159,51878540);西部绿色建筑国家重点实验室自主研究课题(LSZZ202018);陕西省教育厅自然专项(21JK0733)。

摘　　要：为研究带T形钢的内置钢管混凝土组合柱(简称组合柱)的轴压性能,以T形钢翼缘宽度、翼缘厚度、腹板高度和体积配箍率、截面形式为试验参数,按照缩尺比例1∶3设计并制作了9个带T形钢的内置圆钢管混凝土组合柱、1个带T形钢的内置方钢管混凝土组合柱和1个十字形钢混凝土组合柱并对其进行轴压试验,研究组合柱的破坏形态、荷载-位移曲线、应变发展规律,并分析组合柱的受力机理和各参数对其轴压性能的影响;采用ABAQUS软件建立有限元模型,对比峰值荷载、峰值荷载时有限元与试验得到的组合柱的混凝土损伤和钢材破坏形态,在验证模型正确的基础上,进一步研究组合柱材料属性(混凝土强度、钢材强度)和几何参数(T形钢翼缘(腹板)尺寸、钢管径厚比)对其轴压性能的影响。研究结果表明:峰值荷载后,在箍筋和T形钢板的共同约束作用下,钢管外围混凝土性能得到改善,组合柱延性较好;钢管外围混凝土强度等级从C40提高至C80,峰值荷载提高25%~28%,而提高钢管内混凝土强度等级对提升峰值荷载效果不显著,建议钢管内混凝土强度不宜大于钢管外混凝土强度;钢管径厚比宜在10~18内取值,可显著改善该类组合柱的延性。Focusing on the axial compression performance of steel tube with T-shaped steel reinforced concrete column, the width of the T-shaped steel flange, the thickness of the T-shaped steel flange, the height of the T-shaped steel web, the volume hoop ratio, and the section form were taken as the test parameters. Axial compression tests were carried out on 11 composite columns at a scale of 1∶3, including 9 circular steel tube composite columns with T-shaped steel, 1 square steel tube composite column with T-shaped steel, and 1 cross-shaped steel composite column. The failure mode, load-displacement curve, and strain development law of the composite column were studied. The force mechanism of the composite column and the influence of various parameters on its axial compression performance were analyzed as well. Finite element model was established by ABAQUS software, and the peak load of the column, the concrete damage and the steel failure form under the peak load were compared and tested. On the basis of verifying the correctness of the model, the influence of the material properties(concrete strength, steel strength) and geometric parameters(T-shaped steel flange(web) size, steel tube diameter-thickness ratio) of the composite column were further investigated. The results show that after the peak load, the performance of the concrete outside the steel tube is improved under the double restraint of stirrups and steel, and the ductility of the composite column is modified. The strength of the concrete outside the steel pipe is increased from C40 to C80, and the peak load is increased by 25%-28%. With the increase of concrete strength in steel tube, the peak load does not increase significantly. It is recommended that the strength of the concrete inside the steel pipe should not be greater than that of the concrete outside the steel pipe. It is suggested that the ratio of diameter to thickness of steel pipe should be within 10-18, which can significantly improve the ductility of this type of composite column.

关 键 词：带T形钢组合柱 轴压试验 数值模拟 轴压性能 延性 

分 类 号：TU398[建筑科学—结构工程] TU317.1