不同加载模式下钢管约束重组竹轴压力学行为

吴凤贻; 魏洋; 王高飞; 林煜; 丁明珉

doi:10.13801/j.cnki.fhclxb.20230616.002

不同加载模式下钢管约束重组竹轴压力学行为

doi: 10.13801/j.cnki.fhclxb.20230616.002

南京林业大学　土木工程学院，南京 210037

基金项目: 国家自然科学基金(51778300)；江苏省研究生科研与实践创新计划(KYCX22_1061)；江苏省重点研发计划项目(BE2020703)

详细信息

通讯作者:
魏洋，博士，教授，博士生导师，研究方向为新型材料与新型结构　E-mail: wy78@njfu.edu.cn

中图分类号: TU398.6；TB332
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出版历程
- 收稿日期: 2023-04-20
- 修回日期: 2023-05-23
- 录用日期: 2023-06-02
- 网络出版日期: 2023-06-16
- 刊出日期: 2024-02-01

Mechanical behavior of bamboo scrimber filled steel tube under different loading modes

College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

Funds: National Natural Science Foundation of China (51778300); Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_1061); Key Research and Development Project of Jiangsu Province (BE2020703)

摘要

摘要: 本文将重组竹与钢管复合形成新型钢管约束重组竹。对24个新型钢管约束重组竹圆柱试件进行了轴压试验，研究了钢管厚度和加载方式(全截面与核心加载)对其轴压性能的影响。试验结果表明：外加钢管能够有效地提高结构承载力和变形能力；钢管约束重组竹圆柱主要破坏形态为剪切破坏；结构的峰值应力、峰值应变均与钢管厚度呈正相关，随着钢管厚度增加，试件的峰值应力最大增长22.4%，峰值应变最大增长6.1%；核心受压钢管重组竹较全截面受压试件展现了更好的承载潜力和变形能力。根据全截面受压和核心受压的曲线不同，考虑了钢管套箍系数，分别提出了两种加载方式下新型钢管约束重组竹的极限应力、极限应变和峰值应力、峰值应变的预测模型，应力计算模型误差均在10%以内。最后建议了应力-应变全曲线模型，预测了不同加载方式下新型钢管约束重组竹的应力-应变变化规律。
- 重组竹 /
- 钢管约束重组竹 /
- 加载方式 /
- 轴压性能 /
- 计算模型
Abstract: By means of structural innovation, a new type of bamboo scrimber filled steel tube was formed by composite materials of bamboo scrimber and steel tube. Axial compression tests were carried out on 24 cylindrical specimens of the new type of bamboo scrimber filled steel tube to study the effect of steel tube thickness and loading mode (full section and core loading) on its axial compression performance. The test results show that the external steel tube can effectively improve the structural bearing capacity and deformation capacity, and the main failure mode of the bamboo scrimber filled steel tube is shear failure. The peak stress and peak strain of the structure are positively correlated with the steel tube thickness. As the steel tube thickness increases, the maximum increase in peak stress of the specimens reaches 22.4%, while the maximum increase in peak strain is 6.1%. The core loading specimens exhibit better load bearing potential and deformation capacity than the full section loading specimens. Based on the different curves of full section loading and core loading, and considering the steel tube confinement factor, the prediction models of ultimate stress, ultimate strain, peak stress and peak strain of the new type of bamboo scrimber filled steel tube under different loading modes are proposed, and the error of the stress calculation model is less than 10%. Finally, the stress-strain full curve model is proposed, and the stress-strain variation of the new bamboo scrimber filled steel tube under different loading modes is predicted.
- bamboo scrimber /
- bamboo scrimber filled steel tube /
- loading mode /
- axial compression behavior /
- calculation model

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图 1 圆形钢管重组竹柱结构概念图

P—Vertical load

Figure 1. Structural concept diagram of bamboo scrimber-filled steel tube

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图 2 钢管重组竹制作过程

Figure 2. Forming process of bamboo scrimber filled steel tube

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图 3 试验加载及测量装置

AF/AS, LF/LS—Strain gage

Figure 3. Test loading and measuring device

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图 4 全截面受压钢管重组竹破坏形态

Figure 4. Typical failure modes of bamboo scrimber filled steel tube under full section loading

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图 5 核心受压钢管重组竹破坏形态

Figure 5. Typical failure modes of bamboo scrimber filled steel tube under core loading

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图 6 钢管重组竹应力-应变关系曲线

Figure 6. Stress-strain curves of bamboo scrimber filled steel tube

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图 7 不同钢管厚度钢管重组竹应力-应变曲线对比

Figure 7. Comparisons of stress-strain curves of bamboo scrimber filled steel tube with different steel tube thickness

f_c—Peak stress of bamboo scrimber filled steel tube specimen; f_c0—Ultimate stress of the bamboo scrimber; ε_c0—Ultimate strain of the bamboo scrimber; ε_c—Peak strain of bamboo scrimber filled steel tube specimen

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图 8 不同加载模式钢管重组竹峰值应力-应变对比

Figure 8. Comparison of peak stress and peak strain of bamboo scrimber filled steel tube under different loading modes

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图 9 全截面受压钢管约束重组竹柱应力-应变曲线

E_y—Elastic-plastic stage stiffness; E'_bs—Proportional stage stiffness; f_cu—Ultimate stress; ε_cu—Ultimate strain; f—Stress; ε—Strain

Figure 9. Stress-strain curve of bamboo scrimber filled steel tube under full-section loading

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图 10 核心受压钢管约束重组竹柱应力-应变曲线

Figure 10. Stress-strain curves of bamboo scrimber filled steel tube under core loading

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图 11 全截面受压钢管约束重组竹柱极限应力-应变模型评估

AV—Average; SD—Standard deviation; AAE—Average sbsolute error

Figure 11. Verification of peak stress and peak strain model under full-section loading

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图 12 核心受压钢管约束重组竹柱极限应力-应变模型评估

Figure 12. Verification of peak stress and peak strain model under core loading

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图 13 全截面受压钢管约束重组竹全曲线模型验证

Figure 13. Full curve model verification of bamboo scrimber filled steel tube under full section loading

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图 14 核心受压钢管约束重组竹全曲线模型验证

Figure 14. Full curve model verification of bamboo scrimber filled steel tube under core loading

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表 1 钢管约束重组竹柱轴压试验结果

Table 1. Axial compression test result of bamboo scrimber filled steel tube

Specimen	H/mm	D_b/mm	D_s/mm	P_cu/kN	f_ce/MPa	ε_ce	f_cy/MPa	ε_cy	f_cc/MPa	ε_cc	E_bs/GPa
D1S4.5-F	345	103	114	1628.8	92.56	0.0019	—	—	159.58	0.064	44.5
D1S6.0-F	345	100	114	1994.2	113.32	0.0021	—	—	195.37	0.063	52.3
D2S4.5-F	400	122	133	1882.3	78.58	0.0019	—	—	135.49	0.063	42.1
D2S6.0-F	400	119	133	2292.6	95.71	0.0018	—	—	165.02	0.065	43.8
D1S4.5-C	345	103	114	1412.0	—	—	142.78	0.033	169.46	0.086	15.8
D1S6.0-C	345	100	114	1413.2	—	—	162.90	0.047	179.94	0.087	16.2
D2S4.5-C	400	122	133	1630.3	—	—	122.86	0.033	139.46	0.075	16.7
D2S6.0-C	400	119	133	1674.3	—	—	131.55	0.031	150.54	0.075	15.2
Notes: Specimens were numbered according to the different parameters of the specimens; D—Diameter of specimen; S—Thickness of the steel tube; F—Full section loading; C—Core loading; H—Height of all specimens; D_b—Diameter of bamboo scrimber; D_s—Outer diameter of steel tube; P_cu—Peak load; f_ce—Proportional limit stress; ε_ce—Proportional limit strain; f_cy—Yield stress; ε_cy—Yield strain; f_cc—Peak stress; ε_cc—Peak strain; E_bs—Nominal initial compressive elastic modulus.

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表 2 钢管力学性能指标

Table 2. Mechanical properties of steel tube

D_s/mm	t_s/mm	f_y/MPa	f_u/MPa	E_s/GPa
114	4.5	327.4	465.9	205.2
133	4.5	336.8	502.2	206.1
114	6.0	376.0	510.2	206.4
133	6.0	381.2	499.2	205.1
Notes: t_s—Thickness of steel tube; f_y—Yield strength of steel tube; f_u—Ultimate tensile strength of steel tube; E_s—Elastic modulus of steel tube.

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表 3 重组竹试件力学性能指标

Table 3. Properties of bamboo scrimber

Specimen	H/mm	D_b/mm	P_bu/kN	f_by/MPa	ε_by	f_bu/MPa	ε_bu	E_b/GPa
D103	345	103	823.8	95.41	0.029	98.87	0.050	18.6
D100	345	100	767.0	94.24	0.029	97.66	0.050	15.6
D122	400	122	1121.9	92.61	0.028	95.97	0.052	15.0
D119	400	119	1053.4	91.40	0.026	94.71	0.048	14.8
Notes: P_bu—Ultimate load; f_by—Yield stress of the bamboo scrimber; ε_by—Yield strain of the bamboo scrimber; f_bu—Ultimate stress of the bamboo scrimber; ε_bu—Ultimate strain of the bamboo scrimber; E_b—Initial compressive elastic modulus.

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