Calculation method for crack width of reinforced UHPC direct tensile members

被引：0
|
作者：
Qiu M. [1 ,2 ]
Zhang Y. [1 ,2 ]
Shao X. [1 ,2 ]
Liu B. [1 ,2 ]
Qu S. [1 ,2 ]
Tao Z. [1 ,2 ]
Tang Y. [1 ,2 ]
机构：
[1] College of Civil Engineering, Hunan University, Changsha
[2] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2023年 / 56卷 / 08期
关键词：
crack width; direct tensile members; direct tensile test; ultra-high performance concrete (UHPC);
D O I：
10.15951/j.tmgcxb.22030304
中图分类号：
学科分类号：
摘要：
To establish the crack width calculation method for reinforced UHPC direct tensile members, the direct tensile tests of five groups reinforced UHPC members were performed at first. Next, the crack development and nominal cracking stress of the specimens were analyzed. Then, the applicability of the formulae for calculating the crack width of reinforced UHPC direct tensile members in CECS 38-2004 and French NF P18-710 specifications were evaluated. Finally, the formula for calculating the crack width of reinforced UHPC direct tensile members considering the effect of UHPC tensile strength was proposed and its applicability was evaluated. The main results are as follows: (1) The configuration of the steel reinforcement and the use of directional distribution fibers can effectively limit the UHPC crack expansion, and increasing the reinforcement ratio is beneficial to reduce the UHPC crack width, while the fiber interface treatment based on ZnPh solution has less effect on the UHPC crack width expansion. (2) The French NF P18-710 code can better predict the crack width of the reinforced UHPC direct tensile members in this paper, while the CECS 38: 2004 code significantly underestimates the crack width. (3) The predicted results by the equation for the stress in the cracking section of reinforced UHPC direct tensile members considering the participation of UHPC tensile strength in the stresses are in good agreement with the experimental values. The mean ratios between the measured and calculated values are in the range of 1. 00~1. 33, and the standard deviations are in the range of 0. 03~0. 48. (4) Based on the comprehensive theory, the average crack spacing formula considering the effects of UHPC residual tensile strength and steel fiber toughened protective layer of UHPC is proposed, and the crack width formula of UHPC axial tension members with reinforcement is further modified. The predicted values by the modified formula agree well with the measured ones. The research results can provide reference for the preparation of UHPC structural design codes. © 2023 Editorial Office of China Civil Engineering Journal. All rights reserved.
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页码：47 / 59
页数：12
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