钢管混凝土缺陷对徐变性能的影响

郝兆峰; 张戎令; 王起才; 祁强; 庄立普; 黄国栋

doi:10.13801/j.cnki.fhclxb.20191030.001

钢管混凝土缺陷对徐变性能的影响

doi: 10.13801/j.cnki.fhclxb.20191030.001

郝兆峰¹,
张戎令^{1, 2, ,},
王起才¹,
祁强³,
庄立普⁴,
黄国栋¹

1.
兰州交通大学　土木工程学院，兰州 730070
2.
兰州交通大学　道桥工程灾害防治技术国家地方联合工程实验室，兰州 730070
3.
平凉职业技术学院　建筑工程系，平凉 744000
4.
中铁21局集团有限公司，兰州 730070

基金项目: 青年人才托举工程；飞天学者特聘计划；长江学者和创新团队发展计划滚动支持（IRT_15R29）；国家自然科学基金（51768033）；甘肃省高校协同创新科技团队支持计划（2017C-08）

详细信息

通讯作者:
张戎令，博士，教授，硕士生导师，研究方向为干寒地区材料耐久性与结构全寿命关键技术及应用　Email：mogzrlggg@163.com

中图分类号: TU398
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出版历程
- 收稿日期: 2019-06-14
- 录用日期: 2019-10-16
- 网络出版日期: 2019-10-30
- 刊出日期: 2020-05-15

Effect of concrete filled steel tube defect on creep property

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
National and Local Joint Engineering Laboratory of Road and Bridge Engineering Disaster Prevention Technology, Lanzhou Jiaotong University, Lanzhou 730070, China
3.
Department of Architectural Engineering, Pingliang Vocational and Technical College, Pingliang 744000, China
4.
China Railway 21 Bureau Group Co., Ltd., Lanzhou 730070, China

摘要

摘要: 为了研究钢管混凝土缺陷试件的徐变性能，进行了7组徐变试验研究，得到了钢管混凝土缺陷试件补强前后徐变度随持荷时间的变化曲线。研究结果表明：相较于无缺陷钢管混凝土，存在缺陷的钢管混凝土徐变度均有不同程度增大，其中，脱黏缺陷钢管混凝土试件的徐变度增量远大于空洞缺陷试件；脱黏缺陷削弱了钢管与混凝土之间的界面黏结，致使钢管与混凝土的应力重分布作用减弱，协同变形能力下降；空洞缺陷处混凝土由于发生应力集中而加剧了裂缝的产生和扩张，混凝土因此而发生错位滑移，增大了钢管混凝土的附加变形；注浆补强后，钢管混凝土的徐变变形减小，但相较于无缺陷钢管混凝土，缺陷补强钢管混凝土的徐变性能仍存在一定程度的折减。
- 钢管混凝土 /
- 徐变 /
- 脱黏 /
- 空洞 /
- 缺陷 /
- 注浆补强
Abstract: In order to study the creep performance of concrete filled steel tube defect specimens, 7 groups of creep tests were carried out, and the curves of creep degree with load holding time before and after strengthening were obtained. The results show that compared with the non-defective concrete-filled steel tube, the creep degree of the defective concrete-filled steel tube increases to different degrees, among them, the creep increment of the specimens with debonding defects is much larger than that with cavity defects. The debonding defect weakens the interface bonding between steel tube and concrete, which weakens the stress redistribution effect of steel tube and concrete, and reduces the cooperative deformation capacity. The stress concentration of concrete at the cavity defect intensifies the generation and expansion of cracks, which leads to the dislocation slip of concrete and increases the additional deformation of concrete-filled steel tube. After grouting, the creep deformation of concrete-filled steel tube decreases. However, compared with concrete-filled steel tube without defects, the creep behavior of reinforced concrete filled steel tube is still reduced to some extent.
- concrete filled steel tube /
- creep /
- debonding /
- cavity /
- defect /
- grouting reinforcement

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图 1 钢管混凝土缺陷示意图

Figure 1. Defect diagram of concrete filled steel tube

下载: 全尺寸图片幻灯片

图 2 浇筑过程中钢管混凝土典型照片

Figure 2. Typical photos of concrete-filled steel tube during pouring

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图 3 应变计和千分表布置

Figure 3. Arrangement of strain gauge and dial gauge

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图 4 钢管混凝土试件加载过程典型照片

Figure 4. Typical photos during loading of concrete filled steel tube specimen

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图 5 不同缺陷对钢管混凝土徐变度的影响

Figure 5. Influence of different defects on creep degree of concrete-filled steel tube

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图 6 缺陷补强后钢管混凝土的徐变度

Figure 6. Creep degree of concrete-filled steel tube after defect reinforcement

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图 7 钢管混凝土试件补强前后徐变度对比曲线

Figure 7. Comparison curves of creep degree of concrete filled steel tube specimens before and after reinforcement

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表 1 P.O42.5水泥性能指标

Table 1. Performance indexes of P.O42.5 cement

Specific surface area/(m²·kg^–1)	Stability/mm	Chloride ion content/%	Alkali content/%	Ignition loss/%	Sulfur trioxide content/%	Initial setting time/min	Final setting time/min	Compressive strength/MPa
Specific surface area/(m²·kg^–1)	Stability/mm	Chloride ion content/%	Alkali content/%	Ignition loss/%	Sulfur trioxide content/%	Initial setting time/min	Final setting time/min	3 d	28 d
326	2	0.012	0.43	1.52	2.44	185	325	21.7	48.6

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表 2 膨胀剂性能参数

Table 2. Performance parameters of expansion agent

Magnesium oxide content/%	Total amount of alkali/%	Chloride ion content/%	Specific surface area/(m²·kg^–1)	Initial setting time/min	Final setting time/min	Limited expansion rate/%		Compressive strength/MPa
Magnesium oxide content/%	Total amount of alkali/%	Chloride ion content/%	Specific surface area/(m²·kg^–1)	Initial setting time/min	Final setting time/min	7 d(Water)	21 d (Air）	3 d	7 d
3.38	0.58	0.009	316	174	259	0.036	–0.019	22.2	40.3

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表 3 混凝土配比

Table 3. Mix ratio of concrete kg·m^–3

Water	Cement	Fine aggregate	Coarse aggregate	Expansive agent	Water reducing agent
180	465	764	1 056	37.2	5.58

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表 4 钢管混凝土试件主要参数

Table 4. Main parameters of concrete-filled steel tube specimens

Group	Steel pipe diameter/mm	Steel pipe height/mm	Steel tube thickness/mm	Slenderness ratio	Defect rate/%	Debonding thickness/mm	Ultimate capacity/kN
P	140	350	3	10	0	0	880
C	140	350	3	10	6.6	0	783
E	140	350	3	10	6.6	0	598
D	140	350	3	10	0	1	710
RC	140	350	3	10	0	0	811
RE	140	350	3	10	0	0	797
RD	140	350	3	10	0	0	863

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表 5 混凝土抗压强度

Table 5. Concrete compressive strength

Curing mode	Standard curing			Seal curing			Sealing and side limit curing
Age/d	7	14	28	7	14	28	7	14	28
Compressive strength f_CU/MPa	48.15	50.29	54.5	49.95	52.56	55.74	47.62	54.36	56.91

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表 6 钢管混凝土缺陷试件补强前后徐变度

Table 6. Creep of concrete filled steel tube defect specimens before and after reinforcement 10^–6 MPa^–1

Loading time/d	P	C	E	D	RC	RE	RD
0	0	0	0	0	0	0	0
1	7.53	9.00	8.19	13.28	8.28	7.78	11.42
3	10.09	12.07	10.98	18.55	11.10	10.43	16.52
5	11.05	13.22	12.03	19.87	12.16	11.43	16.80
7	12.01	14.37	13.07	18.96	13.22	12.42	16.31
9	12.98	15.52	14.12	20.99	14.28	13.41	18.05
11	13.22	15.81	14.86	21.38	14.55	14.12	18.39
13	14.18	16.96	15.43	22.93	15.60	14.66	18.27
15	14.42	17.24	15.69	22.26	15.86	14.91	19.98
17	15.14	18.11	16.47	23.37	16.66	15.65	20.58
19	15.21	18.19	16.55	23.49	16.73	15.72	20.20
21	16.29	19.54	17.73	23.96	17.98	16.84	20.61
23	16.24	19.43	17.68	23.89	17.88	16.80	20.55
25	16.59	19.84	18.05	24.39	18.25	16.43	20.98
27	16.82	20.12	18.30	24.73	18.51	17.39	21.27
29	16.82	20.12	18.30	24.73	18.51	17.39	21.27
32	17.35	20.75	18.88	25.51	19.09	17.94	23.27
36	18.05	21.58	19.64	25.89	19.85	18.66	22.27
40	18.48	22.10	20.11	27.17	20.33	19.10	23.37
44	18.98	22.70	20.66	27.92	20.88	19.63	24.01
48	19.93	23.84	20.84	28.36	21.12	19.80	24.39
52	19.61	23.45	21.34	28.83	21.57	19.42	24.79
60	19.94	23.85	21.70	28.87	21.94	20.62	24.83
68	20.24	24.20	22.02	29.76	22.26	20.92	25.59
77	20.92	25.00	22.75	30.74	23.00	21.61	26.44
87	21.37	25.55	23.24	31.41	23.00	21.89	26.47
107	21.97	26.39	23.98	32.73	23.89	22.57	28.02
137	23.08	27.77	24.41	34.39	24.94	23.73	28.84
167	23.91	28.83	25.61	35.06	25.83	24.02	29.23
197	24.60	29.14	25.78	36.23	26.20	25.06	30.09
227	24.50	29.33	26.72	37.19	26.81	24.99	31.66
257	25.53	30.54	27.08	37.77	27.32	25.99	32.26
Notes: P is no defect component；C is the left cavity component；E is the edge cavity component；D is the ring penetration and debonding component；RC is the left cavity reinforcement component；RE is the edge cavity reinforcement component；RD is the debonding reinforcing component.

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