Calculation method of UHPC local compressive bearing capacity

QIU Ming-hong; SHAO Xu-dong; LIU Qiong-wei; YAN Ban-fu; LI Pan-pan; HUANG Zhong-lin

doi:10.19818/j.cnki.1671-1637.2021.04.008

Volume 21 Issue 4

Sep. 2021

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QIU Ming-hong, SHAO Xu-dong, LIU Qiong-wei, YAN Ban-fu, LI Pan-pan, HUANG Zhong-lin. Calculation method of UHPC local compressive bearing capacity[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 116-129. doi: 10.19818/j.cnki.1671-1637.2021.04.008

Citation:

QIU Ming-hong, SHAO Xu-dong, LIU Qiong-wei, YAN Ban-fu, LI Pan-pan, HUANG Zhong-lin. Calculation method of UHPC local compressive bearing capacity[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 116-129. doi: 10.19818/j.cnki.1671-1637.2021.04.008

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Calculation method of UHPC local compressive bearing capacity

doi: 10.19818/j.cnki.1671-1637.2021.04.008

QIU Ming-hong^{1, 2
,},
SHAO Xu-dong^{1, 2
,},
LIU Qiong-wei^{1, 2},
YAN Ban-fu^{1, 2},
LI Pan-pan^{1, 2},
HUANG Zhong-lin^{1, 2}

1.
College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China
2.
Key laboratory of Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, Hunan, China

Funds:

National Key Research and Development Program of China 2018YFC0705400

National Natural Science Foundation of China 51778223

National Natural Science Foundation of China 52038003

More Information

Author Bio:
QIU Ming-hong(1992-), male, doctoral student, qiuminghong@hnu.edu.cn

SHAO Xu-dong(1961-), male, professor, PhD, shaoxd@vip.163.com
Received Date: 2021-02-16
Available Online: 2021-09-16
Publish Date: 2021-08-01

Abstract

Abstract

To reasonably calculate the local compressive bearing capacity of UHPC members, the local compression test database of UHPCs with and without indirect reinforcement was developed. Based on the database, the calculation formulae of local compressive bearing capacity in codes of NF P 18-710, CECS 38: 2004, DBJ 43/T 325—2017, and JTG 3362—2018 were analyzed and evaluated. A UHPC local compression correction factor and an indirect reinforcement influence factor were proposed to analyze the effects of concrete strength and steel fibers used in the UHPC local compression test database. Subsequently, the local compressive bearing capacity calculation formula in JTG 3362—2018 was modified. Research results indicate that the average ratios of experimental local compressive bearing capacities of UHPCs without indirect reinforcement to the calculated values by UHPC codes of NF P 18-710, CECS 38: 2004, DBJ 43/T 325—2017, and JTG 3362—2018 are 0.97, 0.81, 1.33, and 1.09, respectively. The average ratios of experimental local compressive bearing capacities of UHPCs with indirect reinforcement to the calculated values by CECS 38: 2004, DBJ 43/T 325—2017, and JTG 3362—2018 are 0.91, 1.31, and 1.13, respectively. Therefore, the calculation formulae of concrete local compressive bearing capacity in different codes do not completely reflect the influences of concrete compressive strength and steel fibers. Similarly, the local compressive bearing capacity calculation formulae of indirect reinforcement do not completely reflect the effects of constrained area ratio, concrete compressive strength, and steel fibers. NF P 18-710 can better predict the local compressive bearing capacity of UHPC without indirect reinforcement. CECS 38: 2004 overestimates the local compressive bearing capacity of UHPC, thereby diverging the estimated bearing capacity of indirect reinforcement. As for DBJ 43/T 325—2017 and JTG 3362—2018, their calculation results are relatively conservative. The average ratios of the experimental local compressive bearing capacities to the predicted values by the modified JTG 3362—2018 formula are 1.00 and 1.04 for UHPCs with and without indirect reinforcement, respectively, and the standard deviations in both cases are less than 0.20. Therefore, the modified formula in JTG 3362—2018 can better predict the local compressive capacities of UHPCs with and without indirect reinforcement, and thus it can provide a reference for the design specifications of domestic UHPC bridge structures. 1 tab, 13 figs, 31 refs.
- bridge engineering,
- local compressive bearing capacity,
- test database,
- ultra-high performance concrete,
- calculation formula,
- correction factor

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References(31)

References

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Calculation method of UHPC local compressive bearing capacity

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