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周峰华¹ , 黄建华²

 

(1. 衢州市建设工程质量安全监督站 , 衢州   324000; 2. 东北农业大学 水利与建筑学院 , 哈尔滨    150000)

摘  要: 为提升异形柱结构在水平荷载作用下的抗震性能与薄弱区抗损伤能力 , 以杭衢高铁衢州西站综合交通枢纽项目中 W 形截面异形柱为对象 , 针对其阴角与节点核心区等应力集中区域 , 提出了 CFRP 外贴增强与“ 内钢外纤 ”复合增强两种局部增强方案 , 开展了足尺模型低周反复加载试验 。结果表明 : 两种增强措施均能有效提升节点的承载力 、刚度 、变形能力与耗能性能 , 其中CFRP 外贴增强使承载力峰值荷载提高 10. 6% , 复合增强提高 16. 5% , 后果的提升效果更为显著 ; 复合增强在控制阴角混凝土主拉应变  (降幅 53. 1%) 、抑制裂缝宽度     (降幅 62. 3%) 、降低节点残余位移  (降幅 56. 4%) 以及提升等效黏滞阻尼系数  (达 26. 8%) 等方面表现更优 ,显示出内设斜筋与外部 CFRP 协同工作的综合增强效果 。构建了考虑局部增强效应的 Bouc-Wen 恢复力模型 , 模型参数经识别标定后 , 能准确预测增强后节点的承载力 、滞回耗能与刚度退化行为 , 预测误差在±3. 5% 以内。研究成果可为异形柱结构的局部抗震增强设计与非线性分析提供理论依据与工程参考。

关键词: 异形柱 ; 薄弱区 ; 局部增强 ; 恢复力模型

中图分类号: TU375. 4      文献标志码: A      文章编号: 1005-8249 (2026) 04-0064-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 010

 

Study on Local Reinforcement of Weak Zone of Special-Shaped Column

and Restoring Force Model of Joint

ZHOU Fenghua¹ , HUANG Jianhua²

(1. Quzhou Construction Engineering Quality and Safety Supervision Station, Quzhou 324000, China;

2. College of Water Conservancy and Architecture, Northeast Agricultural University, Harbin 150000, China)

Abstract : In order to improve the seismic performance of the special-shaped column structure under horizontal load and the damage resistance of the weak area, the W-shaped cross-section special-shaped column in the comprehensive transportation hub project of Quzhou West Railway Station of Hangzhou-Quzhou high-speed railway was taken as the object. In view of the stress concentration areas such as the inner corner and the core area of the joint, two local reinforcement schemes of CFRP external reinforcement and‘ inner steel and outer fiber’composite reinforcement were proposed, and the low-cycle repeated loading test of the full-scale model was carried out.  The test results show that the two strengthening measures can effectively improve the bearing capacity, stiffness, deformation capacity and energy dissipation performance of the joints. Among them, the peak load is increased by 10. 6% by CFRP external reinforcement, and the peak load is increased by 16. 5% by composite reinforcement.The composite reinforcement performs better in controlling the main tensile strain of the inner corner concrete ( a decrease of 53. 1%) , inhibiting the crack width (a decrease of 62. 3%) , reducing the residual displacement of the joint ( a decrease of 56. 4%) , and increasing the equivalent viscous damping coefficient ( up to 26. 8%) , which shows the comprehensive enhancement effect of the internal inclined reinforcement and the external CFRP. Based on the experimental data, the Bouc- Wen restoring force model considering the local reinforcement effect is constructed. After the model parameters are identified and calibrated, the bearing capacity, hysteretic energy dissipation and stiffness degradation behavior of the reinforced joints can be accurately predicted, and the prediction error is within ± 3. 5%.  The research results can provide theoretical basis and engineering reference for local seismic enhancement design and nonlinear analysis of special-shaped column structures.

Key words: special-shaped column ; weak area ; local enhancement ; restoring force model