新型裝配式雙艙綜合管廊節點的力學性能試驗

匡亞川; 姜厲陽; 劉胤虎; 莫小飛; 伏亮明; 羅時權

doi:10.13374/j.issn2095-9389.2021.03.07.002

新型裝配式雙艙綜合管廊節點的力學性能試驗

doi: 10.13374/j.issn2095-9389.2021.03.07.002

1.
中南大學土木工程學院, 長沙 410075
2.
中國電建集團中南勘測設計研究院有限公司, 長沙 410014
3.
重慶金科地產集團股份有限公司, 重慶 400000

基金項目: 國家自然科學基金資助項目（51878663）；中南電力建設股份有限公司科技項目

詳細信息

通訊作者:
E-mail: kuangyachuan@csu.edu.cn

中圖分類號: TU990.3
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- 被引次數: 0
出版歷程
- 收稿日期: 2021-03-07
- 網絡出版日期: 2021-07-06
- 刊出日期: 2021-11-25

Experimental study of mechanical properties of joints in a new-type prefabricated double cabin utility tunnel

1.
School of Civil Engineering, Central South University, Changsha 410075, China
2.
Power China Zhongnan Engineering Corporation Limited, Changsha 410014, China
3.
Jinke Property Group Co., Ltd., Chongqing 400000, China

More Information

Corresponding author: E-mail: kuangyachuan@csu.edu.cn

摘要

摘要: 預制裝配綜合管廊結構中，節點是結構的薄弱環節，其力學性能直接影響整體結構的變形和承載力等。本文提出了一種“U型套箍插筋連接”新型裝配式雙艙綜合管廊結構，通過4個節點足尺試件力學性能試驗，包括1個底部L型現澆邊節點試件，1個底部L型裝配邊節點試件，1個頂部L型裝配節點試件和1個底部T型裝配節點試件，以此來驗證“U型套箍插筋”連接技術的有效性。試驗得到了節點足尺試件的開裂荷載、裂縫發展規律、承載能力、破壞方式、構件延性等力學性能。試驗結果表明：新型裝配式管廊節點試件都在靠近角點區域發生彎剪破壞，具有較高的承載力和延性；采用“U型套箍插筋”連接性能可靠，能夠獲得與現澆節點試件相當的力學性能。
- 裝配式綜合管廊 /
- U型套箍插筋連接 /
- 節點足尺試驗 /
- 破壞形態 /
- 承載力 /
- 延性
Abstract: Modernization of urban infrastructure is the premise for improving urban operation efficiency. The traditional direct burying method of the municipal public pipeline requires repeated excavation for maintenance, which seriously affects the traffic and appearance of the city and interferes with the everyday life and work order of residents. With the rapid development of urbanization recently, the city’s underground utility tunnel appears at a historical juncture. To cope with the industry’s urgent need for efficient and green construction technology, China is strongly promoting urban utility tunnels and its development toward prefabrication. The prefabricated utility tunnel efficiently uses the urban underground space, intensively manages various municipal pipelines, and solves the “zipper road” problem; it also has the advantages of increased production efficiency in a short construction period and green environmental protection. The joint is the weakest link of the structure in a prefabricated utility tunnel, and its mechanical properties directly affect the deformation and bearing capacity of the entire structure. A new type of prefabricated double cabin utility tunnel with a “U-shaped ferrule joint bars connection” was proposed. The validity of the method was confirmed through testing the mechanical properties of four full-scale joints, including one bottom L-shaped cast-in-place side joint, one bottom L-shaped assembly side joint, one top L-shaped assembly joint, and one bottom T-shaped assembly joint specimen. The result obtained the mechanical properties of the joint full-scale specimen, such as cracking load, crack development law, bearing capacity, failure mode, and member ductility. Furthermore, the specimens of new prefabricated utility tunnel joints had flexure-shear failures near the corner points despite their high bearing capacity and ductility. Using U-shaped ferrule joint bars provides consistent performance and can obtain mechanical properties comparable with those of cast-in-place joint specimens.
- prefabricated utility tunnel /
- U-shaped ferrule joint bars /
- full-scale test of joints /
- failure form /
- bearing capacity /
- ductility

HTML全文

圖 1 U型套箍插筋連接

Figure 1. U-shaped ferrule joint bars connection

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圖 2 裝配式雙艙綜合管廊。（a）試件的拼裝；（b）節點的澆筑

Figure 2. Prefabricated double cabin utility tunnel: (a) assembly of the specimens; (b) casting of the joints

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圖 3 節點試件的配筋圖（單位：mm）。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 3. Reinforcement drawings of joint specimens (unit: mm): (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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圖 4 試件的制作

Figure 4. Preparation of specimens

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圖 5 節點試件加載裝置。（a）L型節點試件；（b）T型節點試件

Figure 5. Loading device of joint specimens: (a) L-shaped joint specimen; (b) T-shaped joint specimen

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圖 6 混凝土應變片布置圖（單位：mm）。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 6. Layout drawings of concrete strain gauges (unit: mm): (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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圖 7 鋼筋應變片布置圖（單位：mm）。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 7. Layout drawings of steel reinforcement strain gauges (unit: mm): (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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圖 8 試件D-LX裂縫分布圖

Figure 8. Fracture profile of specimen D-LX

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圖 9 試件D-LX破壞形態圖

Figure 9. Destruction pattern of specimen D-LX

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圖 10 試件D-LZ裂縫分布圖

Figure 10. Fracture profile of specimen D-LZ

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圖 11 試件D-LZ破壞形態圖

Figure 11. Destruction pattern of specimen D-LZ

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圖 12 試件U-LZ裂縫分布圖

Figure 12. Fracture profile of specimen U-LZ

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圖 13 試件U-LZ破壞形態圖

Figure 13. Destruction pattern of specimen U-LZ

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圖 14 試件D-TZ裂縫分布圖

Figure 14. Fracture profile of specimen D-TZ

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圖 15 試件D-TZ破壞形態圖

Figure 15. Destruction pattern of specimen D-TZ

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圖 16 節點試件荷載?位移曲線圖。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 16. Load displacement curve of joint specimens: (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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圖 17 試件D-LX和試件D-LZ荷載?位移對比曲線圖

Figure 17. Load displacement comparison curve of joint specimen D-LX and D-LZ

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圖 18 試件荷載?混凝土應變曲線圖。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 18. Load-concrete strain curve of specimens: (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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圖 19 試件荷載?鋼筋應變曲線圖。（a）試件D-LX；（b）試件D-LZ；（c）試件U-LZ；（d）試件D-TZ

Figure 19. Load?steel reinforcement strain curve of specimens: (a) specimen D-LX; (b) specimen D-LZ; (c) specimen U-LZ; (d) specimen D-TZ

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表 1 雙綜合管廊節點足尺模型試件尺寸

Table 1. Specimen size of full-scale model of double cabin utility tunnel

Specimen name	Connection type	Size/mm
D-LX	Cast-in-place	1750×600×300（350）
D-LZ	Assemble	1750（1950）×600×300（350）
U-LZ	Assemble	1700×600×300
D-TZ	Assemble	2650×1550×600×300（350）

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表 2 節點試件各特征點荷載值及豎向位移

Table 2. Specimen size of full-scale model of double cabin utility tunnel

Specimen name	Cracking load/ kN	Cracking deflection/ mm	Yield load/ kN	Yield deflection/ mm	Peak load/ kN	Peak deflection/ mm	Ultimate load/ kN	Ultimate deflection/ mm
D-LX	53.4	0.62	116.5	5.38	143.5	16.50	122.0	24.28
D-LZ	51.4	0.48	109.1	4.73	134.8	17.68	114.6	27.76
U-LZ	44.9	0.85	97.3	6.12	119.2	21.88	101.3	32.40
D-TZ	50.3	0.42	163.1	6.84	198.5	15.86	168.7	30.71

下載: 導出CSV

表 3 節點試件延性系數表

Table 3. Specimen size of a full-scale model with double cabin utility tunnel

Specimen name	${\varDelta _\mu }$/mm	$ {\varDelta _y} $/mm	$\mu $
D-LX	24.28	5.38	4.51
D-LZ	27.76	4,73	5.87
U-LZ	32.40	6.12	5.29
D-TZ	30.71	6.84	4.49

下載: 導出CSV

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