|Table of Contents|

Calculation method of UHPC local compressive bearing capacity(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年04期
Page:
116-129
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Calculation method of UHPC local compressive bearing capacity
Author(s):
QIU Ming-hong1; 2;  SHAO Xu-dong1; 2;  LIU Qiong-wei1; 2;  YAN Ban-fu1; 2;  LI Pan-pan1; 2;  HUANG Zhong-lin1; 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)
Keywords:
bridge engineering;  local compressive bearing capacity;  test database;  ultra-high performance concrete;  calculation formula;  correction factor
PACS:
U442.5
DOI:
10.19818/j.cnki.1671-1637.2021.04.008
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 inJTG 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.

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Last Update: 2021-09-01