| 引用本文: | 曹万林,王如伟,殷飞,王智慧,董宏英.异形截面多腔钢管混凝土巨型柱偏压性能[J].哈尔滨工业大学学报,2020,52(6):149.DOI:10.11918/202003036 |
| CAO Wanlin,WANG Ruwei,YIN Fei,WANG Zhihui,DONG Hongying.Behavior of special-shaped multi-cell concrete-filled steel tube mega-columns under eccentric compression[J].Journal of Harbin Institute of Technology,2020,52(6):149.DOI:10.11918/202003036 |
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| 摘要: |
| 以北京中国尊大厦和天津117大厦巨型柱为原型,进行了4个大尺寸的多腔钢管混凝土巨型柱模型单向重复荷载偏压性能试验,包括1个中国尊八边十三腔巨型柱模型、1个中国尊八边十三腔巨型柱角部腔内设置圆钢管模型、2个天津117大厦六边六腔巨型柱模型,中国尊巨型柱模型缩尺比例为1/13,天津117大厦巨型柱模型缩尺比例为1/12.分析了不同截面形状及构造试件的损伤演化、承载力、变形恢复能力、刚度及其退化,进行了理论计算分析.研究表明:偏压荷载下各试件均具有良好的力学性能；八边十三腔巨型柱角部腔内设置圆钢管,可有效减缓试件损伤发展,明显提高试件承载力和变形能力；六边六腔巨型柱试件偏心距较小时承载力较高,偏心距较大时试件复位能力相对好.采用多国规范及纤维模型法计算了各试件N-M相关曲线和荷载-变形曲线,计算结果与试验结果相比偏于安全；考虑多腔钢管特点,在GB 50936中N-M相关曲线计算方法及韩林海钢管混凝土本构关系基础上,提出了多腔钢管混凝土统一抗压强度fsc计算的简化修正方法与公式,计算所得试件的N-M相关曲线和承载力均与实测符合较好,可供多腔钢管混凝土柱偏压计算参考. |
| 关键词: 异形截面 多腔钢管混凝土 巨型柱 偏压试验 理论分析 |
| DOI：10.11918/202003036 |
| 分类号:TU398;TU317.1 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51578020) |
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| Behavior of special-shaped multi-cell concrete-filled steel tube mega-columns under eccentric compression |
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CAO Wanlin,WANG Ruwei,YIN Fei,WANG Zhihui,DONG Hongying
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(College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China)
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| Abstract: |
| Based on the mega-columns in the projects of China Zun and Tianjin 117 Tower, 4 multi-cell concrete-filled steel tube mega-column specimens were designed, and experimental study was conducted under one-way repeated eccentric compression load. The specimens include one 1/13 scaled octagonal 13-cell model of China Zun, one 1/13 scaled octagonal 13-cell model of China Zun with circular steel tube at corners, and two 1/12 scaled hexagonal 6-cell models of Tianjin 117 Tower. The damage evolution, bearing capacity, deformation restoration capacity, stiffness, and degeneration of the specimens with different section shapes and constructions were theoretically analyzed. Results show that all the specimens had good behaviors under eccentric compression. The setting of octagonal 13-cell mega-column with circular steel tube at corners could effectively reduce the damage evolution and significantly improve the bearing capacity and deformation capacity. Higher bearing capacity could be obtained when the eccentricity of the hexagonal 6-cell mega-column specimen was small, and the restoration capacity of the specimen was relatively good when the eccentricity was large. Various codes and the fiber based method were used to estimate the N-M interaction curves and F-Δ curves of the specimens, and the calculation results were more conservative compared with experimental results. Hence, referring to the features of multi-cell concrete-filled steel tube columns, a modified simplified calculation method for compressive strength of multi-cell concrete-filled steel tube (fsc) was proposed on the basis of the calculation method in code GB 50936 and the constitutive relation of concrete proposed by Han. The calculated N-M interaction curves and bearing capacity were in good agreement with measured results, which suggests that the simplified method can be used as a reference for the calculation of multi-cell concrete-filled steel tube columns under eccentric compression. |
| Key words: special-shaped section multi-cell concrete-filled steel tube mega-column eccentric compression test theoretical analysis |
