Seismic experiment and structure optimization research on special-shaped column joint of column wall reinforced concrete-filled steel tube frame

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jan.2026, Vol.49 No.1: 102-110, 118

DOI: 10.3969/j.issn.1003-5060.2026.01.015

Authors

CHEN Anying ^1,2, YUAN Lizheng ¹, WANG Bo ^1,2, WAN Haiying ^1,2, WANG Zhaofeng ¹

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to study the seismic performance of special-shaped column joint of column wall reinforced concrete-filled steel tube (CFST) frame, three specimens were designed by changing the thickness and height of the reinforced area of the column wall, and low-cycle repeated loading was performed on them. The test results show that the plastic hinge failure of the steel beam flange mainly occurs in each specimen, the hysteresis curve is a full shuttle shape as a whole, the bearing capacity of each specimen is good, and the joint has good seismic performance. The finite element models of three test specimens were established using ABAQUS finite element software, and the failure modes, curves and strain distributions of the test and finite element simulation were compared to verify the reliability of the finite element simulation method. The seismic performance of the joint was further clarified through analysis. The butt weld of the steel corbel and the steel beam flange is torn prematurely during the test, which compromises the energy dissipation capacity and ductility of the joint. Based on the validated finite element simulation method, the effects of reducing the thickness of the steel corbel wall plate and the reduced beam section (RBS) structure on the seismic performance of the specimens and reducing the risk of fracture at the weld position were studied. The results show that these two structures can effectively reduce the risk of fracture at the weld position. Based on the design requirements, it is suggested that the slope gradient of steel corbel should not be less than 1:6.25, and the reduction ratio of steel beam flange should not be more than 0.267.

Keywords: concrete-filled steel tube(CFST); special-shaped column joint; low-cycle repeated loading; finite element analysis; structure optimization; rupture index

作者信息

陈安英 ^1,2，袁礼正 ¹，王波 ^1,2，完海鹰 ^1,2，王兆峰 ¹

(1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 土木工程结构与材料安徽省重点实验室，安徽合肥 230009)

摘要和关键词

摘要: 为研究柱壁加强型钢管混凝土(concrete-filled steel tube, CFST)框架异形柱节点的抗震性能,文章通过改变柱壁加强区厚度与高度设计3个试验试件,并对其进行低周反复加载。结果表明:各试件主要发生钢梁翼缘的塑性铰破坏,滞回曲线整体为饱满梭形,各试件承载力较好,节点具备良好的抗震性能;利用ABAQUS有限元软件建立3个试验试件的有限元模型,对比试验与有限元模拟的破坏模式、曲线以及应变分布规律,验证了有限元模拟方法的可靠性,并通过分析进一步明确了节点的抗震性能。试验过程中也出现了钢牛腿与钢梁翼缘的对接焊缝撕裂较早,影响节点耗能能力与延性的充分发挥,基于已验证的有限元模拟方法,研究减小钢牛腿壁板厚度与“狗骨式”构造对于节点抗震性能以及减小焊缝位置断裂风险的影响,结果表明这2种构造可以有效降低焊缝位置的断裂风险,基于设计要求,建议钢牛腿斜坡坡度不小于1:6.25,钢梁翼缘削弱比例不大于0.267。

关键词: 钢管混凝土(CFST)；异形柱节点；低周反复加载；有限元分析；构造优化；断裂指数

Funding

国家自然科学基金资助项目（52178136）；阜阳市住建局专项资金资助项目（FY2022FS0519）

合肥工业大学学报(自然科学版)

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