空间结构压杆的套管加固失效模式试验研究

曾滨; 许庆; 陈映; 王春林

doi:10.6052/j.issn.1000-4750.2021.08.0598

空间结构压杆的套管加固失效模式试验研究

doi: 10.6052/j.issn.1000-4750.2021.08.0598

曾滨^1, ,,
许庆^1,,
陈映^2,,
王春林^2,

1.
中冶建筑研究总院有限公司，北京 100088
2.
东南大学混凝土及预应力混凝土结构教育部重点实验室，南京 210096

基金项目: 国家自然科学基金重点项目(52038010)；国家工业建筑诊断与改造工程技术研究中心开放基金课题项目(YZA2017KY04)

详细信息

作者简介:
许　庆(1978−)，男，山西人，教授级高工，硕士，主要从事预应力诊治研究(E-mail: xuqing@cribc.com)

陈　映(1990−)，男，四川人，博士生，主要从事预应力预制结构研究(E-mail: chenying90@seu.edu.cn)

王春林(1980−)，男，江苏人，教授，博士，博导，主要从事预应力预制结构研究(E-mail: chunlin@seu.edu.cn)

通讯作者:
曾　滨(1968−)，男，福建人，教授级高工，博士，博导，总工，主要从事预应力技术研究(E-mail: zengbin@cribc.com)

中图分类号: TU392.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-04
- 录用日期: 2021-12-14
- 修回日期: 2021-12-02
- 网络出版日期: 2021-12-14
- 刊出日期: 2022-11-01

EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES

ZENG Bin^{1
, ,},
XU Qing^1
,,
CHEN Ying^2
,,
WANG Chun-lin^2
,

1.
Central Research Institute of Building and Construction, MCC Group, Beijing 100088, China
2.
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China

摘要

摘要: 空间结构压杆失稳是结构失效的重要原因之一。利用套管加固空间结构压杆以抑制压杆屈曲，增加构件的极限承载能力和延性。通过对不同壁厚、套管与内压杆间隙和内压杆外伸段长度的12根试件进行轴压试验，得到加固前后试件的极限承载能力、破坏模式和延性变化。加固后试件的极限承载能力最大提高了147%，且外套管壁厚越大，内压杆外伸段越短，承载力越高；内压杆与外套管间隙越大，承载力略有下降。加固试验中构件的破坏模式由加固前的整体屈曲失稳变化为加固后的整体失稳、内压杆端部外伸段失稳和两种耦合失稳，且壁厚越小，易发生整体失稳，外伸段越长，易发生内压杆端部失稳，间隙对失稳形态影响不明显。此外，加固后试件延性均大于未经加固内压杆，经过合理设计延性指标能够增加一倍以上。
- 空间结构 /
- 压杆 /
- 套管加固 /
- 失效模式 /
- 极限承载力 /
- 延性
Abstract: The Instability of compression members of space structures is one of the important causes of structural failure. The sleeves were applied to reinforce the compression members in space structures to restrain the buckling of the compression members, and to improve the ultimate bearing capacity and the ductility of the components. Thusly, axial compression tests were conducted on 12 specimens to investigate the ultimate bearing capacity, the failure modes and, the ductility of the compression members with and without sleeves. Key parameters include the sleeves thickness, the gap between the inner compression members and sleeves, and the overhang length of the inner compression members. The maximum increment for the ultimate bearing capacity of the specimens after reinforcing was 146%. Besides, the bearing capacity increased with the increase of the sleeves thickness and, with the decrease of the overhang length of the inner compression members. The bearing capacity decreased slightly with the gap between the inner compression members and the sleeves. After reinforcing the compression members, the failure modes of the components changed from the overall instability of the compression members to the coupling instability of compression members and their inner overhangs. Moreover, the overall instability was prone to occur with the decrease of the sleeves thickness. The instability of the overhang of the inner compression members was likely to be observed with the overhang length. The influence of gap on the failure modes was not obvious. In addition, the ductility of all specimens with sleeves is larger than that of the specimens without sleeves, and the ductility index could be more than doubled with reasonable design.
- space structure /
- compression member /
- sleeve reinforcement /
- failure mode /
- ultimate bearing capacity /
- ductility

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图 1 空间结构模型腹杆失稳

Figure 1. The instability of brace in space structure

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图 2 套管侧向支承

Figure 2. The lateral constraints by the outer sleeve

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图 3 试件构造

Figure 3. Specimen configuration

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图 4 试验装置

Figure 4. Testing setup

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图 5 加载制度

Figure 5. Loading patterns

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图 6 不同壁厚套管试件荷载-位移曲线

Figure 6. Load-displacement curves of different wall thickness

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图 7 不同间隙套管试件荷载-位移曲线

Figure 7. Load- displacement curves of different gap

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图 8 不同外伸段长度套管试件荷载-位移曲线

Figure 8. Load- displacement curves of different overhang length

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图 9 套管构件变形模式

Figure 9. Flexural deformation modes of the sleeved bar

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图 10 延性指标示意图

Figure 10. Schematic plot of ductility index

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图 11 有限元模型

Figure 11. Finite element model

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图 12 荷载-位移曲线对比

Figure 12. Comparison of load-deformation curves

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图 13 失效模式对比

Figure 13. Comparison of failure modes

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图 14 装配式套管构件

Figure 14. Assembled sleeve member

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表 1 套管设计尺寸

Table 1. Design values of sleeves /mm

试件号	试件名	外套管总长度L	外套管外径R	外套管壁厚T	内压杆外伸端长度L₀	间隙值g
S2	L2400g2.5T2.5	2400	80	2.5	100	2.5
S3	L2400g2.5T4		83	4		2.5
S4	L2400g2.5T10		95	10		2.5
S5	L2400g5.5T4		89	4		5.5
S6	L2400g8.5T4		95	4		8.5
S7	L2400g10T2.5		95	2.5		10
S8	L2400g2.5T6		87	6		2.5
S9	L2350g2.5T6	2350	87	6	150	2.5
S10	L2450g2.5T6	2450	87	6	50	2.5
S11	L2450g2.5T4		83	4		2.5
S12	L2450g2.5T10		95	10		2.5
注：L、R和T分别为外套管总长度、外径和壁厚；L₀为内压杆外伸端长度；g为外套管与内压杆之间间隙值，为外套管内径与内压杆外径差值的一半。

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表 2 试件实测尺寸

Table 2. Measured values of specimens /mm

试件号	外套管总长度L	外套管外径R	外套管壁厚T	内压杆外伸端长度L₀	间隙值g
S1^*	2660.53	69.86	4.26	−	−
S2	2400.17	80.05	2.68	100.00	2.34
S3	2397.60	83.56	4.32	103.40	2.61
S4	2398.90	96.23	10.93	100.63	2.23
S5	2397.87	88.95	4.18	103.70	5.26
S6	2399.13	94.80	4.31	101.93	8.09
S7	2399.07	94.86	2.54	100.93	9.89
S8	2389.67	89.02	6.36	101.40	3.24
S9	2350.07	89.42	6.52	151.47	3.24
S10	2451.20	89.23	6.48	48.83	3.19
S11	2451.43	83.44	4.55	49.57	2.23
S12	2449.40	95.40	10.92	51.33	1.90
注：S1^*行中为所有试件的内压杆实测尺寸平均值。

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表 3 材料性能参数

Table 3. Material constants

试样	弹性模量E/GPa	名义屈服强度σ_0.2/MPa	抗拉极限强度σ_b/MPa	断后伸长率δ/(%)
R70T4	190.87	303.98	462.05	21.04
R80T2.5	206.51	327.56	488.04	19.66
R83T4	193.03	310.89	476.52	18.81
R89T4	203.62	336.56	465.94	24.33
R87T6	195.55	276.02	451.10	21.42
R95T2.5	206.34	342.03	471.09	19.61
R95T4	205.08	276.38	459.85	21.17
R95T10	209.44	314.93	476.22	18.17
注：R为试件外径尺寸；T为试件壁厚。

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表 4 试件试验结果

Table 4. Test results of specimens

试件号	试件名	试件峰值承载力P_max/kN	试件延性指标u
S1	−	107.54	1.67
S2	L2400g2.5T2.5	164.13	2.55
S3	L2400g2.5T4	200.13	3.04
S4	L2400g2.5T10	265.34	2.07
S5	L2400g5.5T4	203.85	2.12
S6	L2400g8.5T4	189.23	3.95
S7	L2400g10T2.5	157.54	3.22
S8	L2400g2.5T6	227.69	4.28
S9	L2350g2.5T6	214.15	2.71
S10	L2450g2.5T6	220.00	1.82
S11	L2450g2.5T4	232.15	3.45
S12	L2450g2.5T10	260.22	2.35
注：P_max为试件峰值承载力；u为试件的延性指标，相关讨论见3.3节。

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表 5 试件破坏模式

Table 5. Failure modes of specimens

试件	S1	S2	S3	S4
整体形态
端部形态
模式	整体失稳	整体失稳	端部失稳	端部失稳

试件	S5	S6	S7	S8
整体形态
端部形态
模式	耦合失稳	端部失稳	整体失稳	端部失稳

试件	S9	S10	S11	S12
整体形态
破坏形态
模式	端部失稳	端部失稳	耦合失稳	端部失稳

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