Reliability-based Research on Material Partial Factor of Reinforced UHPC Flexural Members

被引：0
|
作者：
Shao X.-D. [1 ]
Huang Z.-L. [1 ]
Qiu M.-H. [1 ]
Yan B.-F. [1 ]
机构：
[1] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Hunan, Changsha
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 07期
关键词：
bridge engineering; flexural capacity; material partial factor; Monte Carlo simulation; reliability index; UHPC beam;
D O I：
10.19721/j.cnki.1001-7372.2022.07.010
中图分类号：
学科分类号：
摘要：
In order to ensure that the design formulas meets the reliability requirement, the ultra-high performance concrete (UHPC) material partial factor in the equations of flexural capacity was analyzed and calibrated in Code Specification for Application of Highway Ultra High Performance Concrete Bridge and Culverts. Firstly, Based on the existing papers, a total of 648 UHPC compressive strength tests, 210 tensile strength tests and 53 flexural beams tests in China were collected, and the statistical parameters of relevant variables were obtained. Then a computing space of 4 158 UHPC flexural beams was established, in which a Monte Carlo simulation was used to conduct a reliability analysis to find out the influence of section type, material strength, longitudinal reinforcement ratio and live load ratio on the reliability index of reinforced UHPC flexural beams. Based on the analysis, the computing space was subdivided. Then with the goal that the mean reliability index of T-shaped section beams reaches βT=4.2 with longitudinal reinforcement ratio of 0.05 and live load ratio between 0.05 and 0.5, the UHPC material partial factor under flexural was calibrated. The results show that: Among the resistance statistical parameters, the compressive strength and tensile strength of UHPC and the calculation errors of flexural capacity of UHPC beams do not reject the normal distribution. The reliability index of UHPC beam under flexural is mainly affected by live load ratio and longitudinal reinforcement ratio, while the material strength has little influence. The lower the live load ratio and the higher the longitudinal reinforcement ratio, the lower the reliability index.When the live load ratio rises from 0.05 to 1.0, the reliability index increases greatly. And when the live load ratio is greater than 0.5, the reliability index is higher than 4.2. When the longitudinal reinforcement ratio increased from 0.005 to 0.05, the reliability index decreased significantly. And when the longitudinal reinforcement ratio is higher than 0.05, the reliability index remains almost unchanged. Under the same condition, the reliability index of rectangular section beam is slightly higher than that of T-shaped section beam. The UHPC material partial factor under flexural is suggested to be 1.3. © 2022 Xi'an Highway University. All rights reserved.
引用
收藏
页码：126 / 141
页数：15
相关论文
共 135 条
  • [1] RICHARD P, CHEYREZY M., Composition of reactive powder concretes, Cement and Concrete Research, 25, 7, pp. 1501-1511, (1995)
  • [2] CHEN Bao-chun, JI Tao, HUANG Qing-wei, Et al., Review of research on ultra-high performance concrete[J], Journal of Architecture and Civil Engineering, 31, 3, pp. 1-24, (2014)
  • [3] SHAO Xu-dong, QIU Ming-hong, YAN Ban-fu, Et al., A review on the research and application of ultra-high performance concrete in bridge engineering around the world[J], Materials Reports, 31, 23, pp. 33-43, (2017)
  • [4] LIANG Xing-wen, WANG Ping, XU Ming-xue, Et al., Investigation on flexural capacity of reinforced ultra high performance concrete beams[J], Engineering Mechanics, 36, 5, pp. 110-119, (2019)
  • [5] SHAFIEIFAR M, FARZAD M, AZIZINAMINI A., A comparison of existing analytical methods to predict the flexural capacity of ultra high performance concrete (UHPC) beams, Construction and Building Materials, 172, pp. 10-18, (2018)
  • [6] WANG Xue-jun, Research on flexural performance of reactive powder concrete beams[J], Sichuan Building Science, 43, 5, pp. 22-26, (2017)
  • [7] JTG TF 50-2011, Specification for application of highway ultra high performance concrete bridge and culverts
  • [8] ZHENG Wen-zhong, Li LI, LU Shan-shan, Experimental research on mechanical performance of normal section of reinforced reactive powder concrete beam[J], Journal of Building Structures, 32, 6, pp. 125-134, (2011)
  • [9] CAO Xia, CHANG Jing, WANG Yan-jun, Experimental study on flexural capacity of normal section of high strength reinforced reactive powder concrete beam[J], Journal of Henan Polytechnic University:Natural Science, 34, 1, pp. 109-115, (2015)
  • [10] QIU M H, SHAO X D, WILLE K, Et al., Experimental investigation on flexural behavior of reinforced ultra high performance concrete low-profile t-beams, International Journal of Concrete Structures and Materials, 14, 2, pp. 1-10, (2020)
12345678910