高强箍筋约束超高性能混凝土柱轴压性能

邓宗才; 姚军锁

doi:10.13801/j.cnki.fhclxb.20200203.002

高强箍筋约束超高性能混凝土柱轴压性能

doi: 10.13801/j.cnki.fhclxb.20200203.002

邓宗才^,,
姚军锁

北京工业大学　城市与工程安全减灾省部共建教育部重点实验室，北京 100124

基金项目: 北京市教委科技重点项目 (KZ201810005008)

详细信息

通讯作者:
邓宗才，博士，教授，博士生导师，研究方向为超高性能混凝土及其结构　E-mail：dengzc@bjut.edu.cn

中图分类号: TU375.3
计量
- 文章访问数: 1376
- HTML全文浏览量: 405
- PDF下载量: 74
- 被引次数: 0
出版历程
- 收稿日期: 2019-11-08
- 录用日期: 2019-12-20
- 网络出版日期: 2020-02-04
- 刊出日期: 2020-10-15

Axial compression behavior of ultra-high performance concrete columns confined by high-strength stirrups

DENG Zongcai^,,
YAO Junsuo

Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 通过5根高强箍筋约束超高性能混凝土(Ultra high performance concrete，UHPC)柱及4根普通箍筋约束UHPC柱的轴心受压试验，对其承载力、破坏形态、钢筋应变及应力-应变曲线进行了研究，并结合延性、韧性指数分析了体积配箍率、箍筋强度、箍筋间距及形式对约束UHPC轴压性能的影响。结果表明：所有约束柱均表现为延性破坏，高强箍筋可减轻约束UHPC的破坏程度；高体积率、小间距、形式复杂的高强箍筋约束UHPC，约束效率高，承载力及变形能力提高显著，轴压性能较理想；体积配箍率对轴压性能的影响程度大于箍筋强度；影响体积配箍率变化的因素中，箍筋间距对改善约束性能的贡献最大，依次是箍筋形式和直径；高强箍筋可有效约束UHPC，在提高约束UHPC强度、变形性能及残余承载力方面明显优于普通箍筋；纵筋微曲会加速保护层剥离，密配高强箍筋能有效延迟纵筋屈曲，显著提高约束性能；纵筋微曲会削弱高强箍筋对核心UHPC的约束效果，建议采用高强纵筋与高强箍筋组合。在试验的基础上给出了能较准确预测箍筋约束UHPC柱承载力的计算式。
- 超高性能混凝土(UHPC) /
- 高强箍筋 /
- 轴压性能 /
- 约束UHPC /
- 应力-应变曲线 /
- 影响因素
Abstract: Based on the axial compression test of 5 ultra-high performance concrete (UHPC) columns confined by high-strength stirrups and 4 UHPC columns confined by normal-strength stirrups, the bearing capacity, failure mode, steel strain and stress-strain curve for the confined UHPC columns were studied, and the influences of volume stirrup ratio, strength, spacing and configuration of stirrup on the axial compression behavior of confined UHPC were analyzed by combining ductility and toughness index. The results show that all the specimens have ductility damages, and the damage degree of UHPC columns confined by high-strength stirrups is lighter. The confined UHPC columns with high volume stirrup ratio, closely spaced, high-strength and complex ties configuration have good confinement efficiency, bearing capacity and deformation performance, which also leads to an ideal axial compression behavior. The effect of volume stirrup ratio on the axial compression behavior of specimens is greater than that of stirrup strength. Among the three factors affecting the volume stirrup ratio, such as spacing, configuration and diameter of stirrup, the stirrup spacing contributes most to the improvement of confinement performance, followed by the configuration and diameter of stirrup. The UHPC confined by high-strength stirrups presents better axial compression performance and residual bearing capacity than the normal-stirrups. The micro-bending of the longitudinal bars accelerates the cover spalling, while the high-strength stirrups with close space effectively delays the buckling of longitudinal bars, and significantly improves the overall performance of the confined UHPC. The micro-bending of longitudinal bars weakens the confine effect of the high-strength stirrups on the core UHPC, and the combination of high-strength longitudinal bars and stirrups is suggested. Based on the test data, the formulas to determine the bearing capacity of UHPC columns confined by stirrups are drawn.
- ultra-high performance concrete (UHPC) /
- high-strength stirrups /
- axial compression behavior /
- confined UHPC /
- stress-strain curve /
- influence factors

HTML全文

图 1 箍筋约束超高性能混凝土(UHPC)柱设计详图及应变片布置

Figure 1. Design details and strain gage locations of ultra-high performance concrete (UHPC) columns confined by stirrups

下载: 全尺寸图片幻灯片

图 2 钢纤维和含纤维UHPC坍落扩展度

Figure 2. Steel fibers and UHPC slump with fibers

下载: 全尺寸图片幻灯片

图 3 钢筋拉伸试验应力-应变曲线

Figure 3. Tension test stress-strain curves of steel reinforcement

下载: 全尺寸图片幻灯片

图 4 箍筋约束UHPC柱轴压试验装置及测点布置

Figure 4. Test machine and measuring points of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 5 箍筋约束UHPC柱最终破坏情况

Figure 5. Final failure mode of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 6 实测箍筋约束UHPC柱荷载-应变全曲线

Figure 6. Axial load-strain curves of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 7 实测箍筋约束UHPC柱荷载-泊松比曲线

Figure 7. Load-poisson ratio curves of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 8 实测箍筋约束UHPC柱纵筋、箍筋的应力-应变曲线

Figure 8. Load-strain curves of longitudinal reinforcement and stirrups of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 9 箍筋约束UHPC柱延性(I₁₀)、韧性指数(T)计算模型

Figure 9. Definitions of ductility (I₁₀) and toughness (T) index of UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

图 10 核心区约束UHPC应力-应变全曲线计算方法

Figure 10. Calculation method of stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 11 箍筋强度对约束UHPC应力-应变曲线的影响

Figure 11. Effect of tie strength on the stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 12 箍筋间距对约束UHPC应力-应变曲线的影响

Figure 12. Effect of tie spacing on the stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 13 箍筋形式对约束UHPC应力-应变曲线的影响

Figure 13. Effect of tie configure on the stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 14 ρ_v·f_yv对约束UHPC应力-应变曲线的影响

Figure 14. Effect of ρ_v·f_yv on the stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 15 体积配箍率ρ_v对约束UHPC应力-应变曲线的影响

Figure 15. Effect of volume stirrups ratio ρ_v on the stress-strain curve of confined core UHPC

下载: 全尺寸图片幻灯片

图 16 约束UHPC f_cc/f_c0-I_e关系曲线

Figure 16. Relationship between f_cc/f_c0 and I_e of confined core UHPC

下载: 全尺寸图片幻灯片

图 17 箍筋约束UHPC柱承载力计算值与试验值比值关系

Figure 17. Ratio of calculated value of bearing capacity to experimental value for UHPC columns confined by stirrups

下载: 全尺寸图片幻灯片

表 1 箍筋约束UHPC柱设计参数

Table 1. Design parameters of UHPC columns confined by stirrups

Column ID	f_cu/MPa	Stirrup
Column ID	f_cu/MPa	d/mm	s/mm	ρ_v/%	f_yv/MPa	CF
HTRB630/UHPC(R)	143.0	10	80	2.1	723.45	R
HRB400/UHPC(R)	153.9	10	80	2.1	491.68	R
HRB400/UHPC(L)-1	143.0	10	60	4.7	491.68	L
HRB400/UHPC(L)-2	143.0	10	80	3.5	491.68	L
HTRB630/UHPC(L)-1	153.9	10	60	4.7	723.45	L
HTRB630/UHPC(L)-2	153.9	10	80	3.5	723.45	L
HTRB630/UHPC(L)-3	153.9	8	80	2.2	701.57	L
HTRB630/UHPC(C)	153.9	10	80	4.6	723.45	C
HRB400/UHPC(C)	143.0	10	80	4.6	491.68	C
P	143.0	—	—	—	—	—
Notes: f_cu—Average value of measured cube compressive strength; d and s—Diameter and spacing of stirrup respectively; ρ_v and f_yv—Volume stirrup ratio and the yield strength of stirrup respectively; CF—Stirrups configuration; R—Rectangular stirrup; L—Diamond-shaped composite stirrup; C—Diamond-shaped cross composite stirrup; P—Unreinforced UHPC column (both longitudinal and stirrup are not equipped). Such as, HTRB630/UHPC(L)-1 represents the UHPC column confined by diamond-shaped composite (L) high-strength (HTRB630) stirrup, and "−1" is only numbered to distinguish the specimens of the same type of stirrup with different stirrup ratios.

下载: 导出CSV

表 2 UHPC配合比

Table 2. Mix proportions of UHPC kg/m³

W	C	MS	FA	BFS	SS	SP	SF
180	500	150	150	200	1 200	20.5	145
Notes: W—Water; C—Cement; MS—Microsilica; FA—Fly ash; BFS—Blast-furnace slag; SS—Silica sand; SP—Superplasticizer; SF—Steel fiber.

下载: 导出CSV

表 3 箍筋约束UHPC柱轴压试验结果

Table 3. Axial compression test results of UHPC columns confined by stirrups

Column ID	F_max/ kN	ε_c/ ‰	f_c0/ MPa	ε_co/ ‰	f_cc/ MPa	ε_cc/ ‰	ε₈₅/ ‰	ε₆₀/ ‰	ε_c/ ε_co	f_cc/ f_c0	ε_cc/ ε_co	ε₈₅/ ε_co	ε₆₀/ ε_co	T	I₁₀
HTRB630/UHPC(C)	7 134	3.56	104.86	3.17	157.98	5.20	6.64	17.80	1.12	1.51	1.64	2.10	5.62	0.70	8.13
HTRB630/UHPC(L)-1	7 322	3.98	104.86	3.17	170.22	5.38	6.25	20.94	1.26	1.62	1.70	1.97	6.61	0.73	8.36
HTRB630/UHPC(L)-2	6 886	3.74	104.86	3.17	153.36	4.72	7.15	16.34	1.18	1.46	1.49	2.26	5.16	0.71	8.06
HTRB630/UHPC(L)-3	6 281	3.48	104.86	3.17	129.35	3.56	3.95	12.98	1.10	1.23	1.12	1.25	4.10	0.60	7.01
HTRB630/UHPC(R)	5 984	3.40	97.44	3.12	120.43	3.41	3.92	10.95	1.09	1.24	1.09	1.26	3.51	0.60	6.89
HRB400/UHPC(C)	6 189	4.02	97.44	3.12	132.50	4.86	8.35	—	1.29	1.36	1.56	2.68	—	0.74	8.24
HRB400/UHPC(L)-1	6 513	3.81	97.44	3.12	144.72	5.15	6.81	15.90	1.22	1.49	1.65	2.19	5.10	0.69	8.02
HRB400/UHPC(L)-2	5 971	3.44	97.44	3.12	128.29	4.44	6.28	14.13	1.10	1.32	1.42	2.02	4.53	0.67	7.40
HRB400/UHPC(R)	6 072	3.43	104.86	3.17	121.68	3.48	3.67	8.62	1.08	1.16	1.10	1.16	2.72	0.56	6.45
P	5 310	2.51	100.37	2.51	—	—	—	—	—	—	—	—	—	—	—
Notes: F_max and ε_c—Peak load of the columns and its corresponding axial strain respectively; f_c0 and ε_c0—Peak stress and strain of unconfined UHPC and the calculation formula of ε_c0shown in the literature [17] respectively ; f_cc and ε_cc—Peak stress and strain of confined UHPC respectively; ε₈₅ and ε₆₀—Corresponding strain when f_cc decreases by 15% and 40% respectively; T and I₁₀—Toughness index and ductility index respectively.

下载: 导出CSV

参考文献(26)

[1]	覃维祖, 曹峰. 一种超高性能混凝土—活性粉末混凝土[J]. 工业建筑, 1999, 29(4):16-18. doi: 10.3321/j.issn:1000-8993.1999.04.005 QIN Weizu, CAO Feng. A new ultra-high performance concrete-reactive powder concrete[J]. Industrial Construction,1999,29(4):16-18(in Chinese). doi: 10.3321/j.issn:1000-8993.1999.04.005
[2]	邓宗才, 姚军锁. 箍筋约束超高性能混凝土柱受压性能研究进展[J]. 建筑科学与工程学报, 2020, 37(1):14-25. DENG Zongcai, YAO Junsuo. Research progress on compressive behavior of stirrup-confined ultra-high performance concrete columns[J]. Journal of Architecture and Civil Engineering,2020,37(1):14-25(in Chinese).
[3]	邓宗才, 姚军锁. 高强钢筋约束超高性能混凝土柱轴心受压本构模型研究[J]. 工程力学, 2020, 37(5):120-128. DENG Zongcai, YAO Junsuo. The axial compression stress-strain model for ultra-high performance concrete columns confined by high-strength stirrups[J]. Engineering Mechanics,2020,37(5):120-128(in Chinese).
[4]	周文峰, 鲁瑛. 约束混凝土文献综述[J]. 四川建筑科学研究, 2007, 33(3):144-146. doi: 10.3969/j.issn.1008-1933.2007.03.040 ZHOU Wenfeng, LU Ying. The summarization of literature of confined concrete[J]. Sichuan Building Science,2007,33(3):144-146(in Chinese). doi: 10.3969/j.issn.1008-1933.2007.03.040
[5]	HOSINIEH M M, AOUDE H, COOK W D, et al. Behavior of ultra-high performance fiber reinforced concrete columns under pure axial loading[J]. Engineering Structures,2015,99:388-401. doi: 10.1016/j.engstruct.2015.05.009
[6]	AARUP B, JENSEN L R, APS H C, et al. Slender CRC columns[J]. Nordic Concr Res,2005,34:80-97.
[7]	SUGANO S, KIMURA H, SHIRAI K. Study of new RC structures using ultra-high-strength fiber-reinforced concrete (UFC)-The challenge of applying 200 MPa UFC to earthquake resistant building structures[J]. Journal of Advanced Concrete Technology,2007,5(2):133-147. doi: 10.3151/jact.5.133
[8]	EMPELMANN M, TEUTSCH M, STEVEN G. Load-bearing behavior of centrically loading UHPFRC columns[C]// Proceedings of the Second International Symposium on Ultra High Performance Concrete. Kassel: University of Kassel, Germany, 2008: 521-528.
[9]	EMPELMANN M, TEUTSCH M, STEVEN G. Expanding the application range of RC-columns by the use of UHPC[C]// Tailor Made Concrete Structures. London: CRC Press, 2008: 461-468.
[10]	STEVEN G, EMPELMANN M. UHPFRC-columns with high-strength longitudinal reinforcement[J]. Betonund Stahlbetonbau,2014,109(5):344-354. doi: 10.1002/best.201300090
[11]	YANG X, ZOHREVAND P, MIRMIRAN A. Behavior of ultrahigh-performance concrete confined by steel[J]. Journal of Materials in Civil Engineering,2016,28(10):04016113. doi: 10.1061/(ASCE)MT.1943-5533.0001623
[12]	唐昌辉, 刘冬明. 活性粉末混凝土柱轴心受压试验研究[J]. 中国科技论文, 2016, 11(1):7-11. doi: 10.3969/j.issn.2095-2783.2016.01.002 TANG Changhui, LIU Dongming. Experimental study on reactive powder concrete columns under uniaxial compression[J]. China Sciencepaper,2016,11(1):7-11(in Chinese). doi: 10.3969/j.issn.2095-2783.2016.01.002
[13]	SHIN H O, MIN K H, MITCHELL D. Confinement of ultra-high-performance fiber reinforced concrete columns[J]. Composite Structures,2017,176:124-142. doi: 10.1016/j.compstruct.2017.05.022
[14]	SHIN H O, MIN K H, MITCHELL D. Uniaxial behavior of circular ultra-high-performance fiber-reinforced concrete columns confined by spiral reinforcement[J]. Construction and Building Materials,2018,168:379-393. doi: 10.1016/j.conbuildmat.2018.02.073
[15]	吴炎海, 何雁斌, 杨幼华. 活性粉末混凝土(RPC200)的力学性能[J]. 福州大学学报(自然科学版), 2003, 31(5):598-602. WU Yanhai, HE Yanbin, YANG Youhua. Investigation on RPC200 mechanical performance[J]. Journal of Fuzhou University (Natural Science),2003,31(5):598-602(in Chinese).
[16]	过镇海, 时旭东. 钢筋混凝土原理和分析[M]. 北京: 清华大学出版社, 2007. GUO Zhenhai, SHI Xudong. Reinforced concrete theory and analyse[M]. Beijing: Tsinghua University Press, 2007(in Chinese).
[17]	郭晓宇, 亢景付, 朱劲松. 超高性能混凝土单轴受压本构关系[J]. 东南大学学报(自然科学版), 2017, 47(2):369-376. doi: 10.3969/j.issn.1001-0505.2017.02.028 GUO Xiaoyu, KANG Jingfu, ZHU Jinsong. Constitutive relationship of ultrahigh performance concrete under uniaxial compression[J]. Journal of Southeast University (Natural Science Edition),2017,47(2):369-376(in Chinese). doi: 10.3969/j.issn.1001-0505.2017.02.028
[18]	中华人民共和国住房和城乡建设部. 混凝土结构设计规范: GB 50010-2010[S]. 北京: 中国建筑工业出版社, 2011. Housing and Urban-rural Development of the People’s Republic of China. Code for design of concrete structures: GB50010—2010[S]. Beijing: China Architecture and Building Press, 2011(in Chinese).
[19]	贾方方. 钢筋与活性粉末混凝土粘结性能的试验研究[D]. 北京: 北京交通大学, 2013. JIA Fangfang. Experimental study on bond properties between steel bar and reactive powder concrete[D]. Beijing: Beijing Jiaotong University, 2013(in Chinese).
[20]	赵作周, 钱稼茹, 贺小岗, 等. 箍筋约束高强混凝土受压应力-应变本构关系[J]. 建筑结构学报, 2014, 35(5):96-103. ZHAO Zuozhou, QIAN Jiaru, HE Xiaogang, et al. Stress-strain relationship of stirrup-confined high-strength concrete[J]. Journal of Building Structures,2014,35(5):96-103(in Chinese).
[21]	丁红岩, 刘源, 邱实. 高强箍筋约束高强混凝土轴心受压试验研究[J]. 建筑结构, 2015(12):7-12. DING Hongyan, LIU Yuan, QIU Shi. Experimental study on axial compression of high-strength concrete confined by high-strength stirrup[J]. Building Structure,2015(12):7-12(in Chinese).
[22]	SHEIKH S A, UZUMERI S M. Analytical model for concrete confinement in tied columns[J]. Journal of the Structural Division,1982,108(12):2703-2722.
[23]	MANDER J B, PRIESTLEY M J N, PARK R. Theoretical stress-strain model for confined concrete[J]. Journal of Structural Engineering,1988,114(8):1804-1826. doi: 10.1061/(ASCE)0733-9445(1988)114:8(1804)
[24]	史庆轩, 杨坤, 刘维亚, 等. 高强箍筋约束高强混凝土轴心受压力学性能试验研究[J]. 工程力学, 2012, 29(1):141-149. SHI Qingxuan, YANG Kun, LIU Weiya, et al. Experimental study on mechanical behavior of high strength concrete confined by high-strength stirrups under concentric loading[J]. Engineering Mechanics,2012,29(1):141-149(in Chinese).
[25]	杨坤, 史庆轩, 赵均海, 等. 高强箍筋约束高强混凝土本构模型研究[J]. 土木工程学报, 2013, 46(1):34-41. YANG Kun, SHI Qingxuan, ZHAO Junhai, et al. Study on the constitutive model of high-strength concrete confined by high-strength stirrups[J]. China Civil Engineering Journal,2013,46(1):34-41(in Chinese).
[26]	RICHART F E. Reinforced concrete wall and column footings[J]. ACI Journal Proceedings,1948,45(10):97-127.