| 摘要: |
| 对4根带约束拉杆薄壁方钢管/竹胶合板组合空芯柱（SBCCB）试件进行轴压蠕变试验以及蠕变后二次轴压破坏试验，考察试件的轴压蠕变特点、蠕变后受压破坏形态，并分析长期承载对SBCCB试件轴压极限承载力的影响.结果表明：SBCCB试件的轴压蠕变应变随试件长细比的增大而减小、随轴压应力水平增加而增加；不同长细比试件的蠕变应变时间曲线均包含瞬态蠕变阶段和稳态蠕变阶段，温湿度变化对其局部蠕变有影响；蠕变对试件的轴压承载力、轴向及侧向变形能力有较大影响；基于流变力学理论的Burgers计算模型可较好地预测SBCCB试件的蠕变应变发展. |
| 关键词: 竹胶合板 薄壁方形钢管 约束拉杆 组合空芯柱 轴压蠕变 蠕变后承载力 |
| DOI：103969/j.issn.1007 9629201803019 |
| 分类号: |
| 基金项目:国家自然科学基金青年项目(51708476)；广东省自然科学基金资助项目(2017A030310579)；湖南省自然科学基金资助项目(2017JJ3302，2018JJ2401) |
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| Creep Behavior of Square Steel Tube/Bamboo Plywood Composite Column with Binding Bars |
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ZHAO Weifeng, YANG Bin, ZHOU Jing, CHEN Zhuosheng
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College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China
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| Abstract: |
| 4square thin walled steel tube/bamboo plywood composite hollow columns with binding bars(SBCCB) were used to perform the axial compression creep test and the second time axial compression test after the creep test. The characteristics of compressive creep, the failure mode and the ultimate bearing capacity of SBCCB in the second time axial compression test were investigated. The results indicate that axial compressive creep strain decreases as the slenderness ratio increases, and increases as the axial compressive stress increases at the same moment of the creep test. The axial compressive creep strain time curves under different slenderness ratio and stress level generally have a similar tendency, which includes the temporary creep and stationary creep stage, and the change of temperature and humidity has some local influence on the creep. The long term loading generates large influence on the axial compressive load bearing capacity and the deformation of the axial and lateral direction of the SBCCB. The Burgers model, based on the rheology theory, can preferably predict the creep strain development of SBCCB. |
| Key words: bamboo plywood square thin walled steel tube binding bar composite hollow column axial compressive creep load bearing capacity after creep |
