Reliability evaluation of flexural capacity design provision for UHPC beams reinforced with steel rebars/prestressing tendons

被引：32
作者：
Feng, Jiahui [1 ,2 ]
Shao, Xudong [1 ,2 ]
Qiu, Minghong [1 ,2 ,3 ,5 ]
Li, Huihui [4 ]
Gao, Xiang [1 ,2 ]
Huang, Zhonglin [1 ,2 ]
机构：
[1] Hunan Univ, Coll Civil Engn, State Key Lab Bridge Engn Safety & Resilience, Changsha 410082, Peoples R China
[2] Hunan Univ, Coll Civil Engn, Key Lab Wind & Bridge Engn Hunan Prov, Changsha 410082, Peoples R China
[3] Univ Hong Kong, Dept Civil Engn, Pokfulam, Hong Kong, Peoples R China
[4] Shenzhen Univ, Coll Civil & Transportat Engn, Shenzhen 518060, Peoples R China
[5] Hunan Univ, Coll Civil Engn, State Key Lab Bridge Engn Safety & Resilience, Key Lab Wind & Bridge Engn Hunan Prov, Changsha 410082, Peoples R China
来源：
ENGINEERING STRUCTURES | 2024年 / 300卷
基金：
中国国家自然科学基金;
关键词：
Ultra-high performance concrete (UHPC); Reliability index; Flexural capacity; Standards; Reinforced UHPC beams; Prestressed UHPC beams; CONCRETE BEAMS; STRUCTURAL PERFORMANCE; BEHAVIOR; STRENGTH; BRIDGES;
D O I：
10.1016/j.engstruct.2023.117160
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigated the reliability of the flexural capacity prediction models for ultra-high performance concrete (UHPC) beams in various standards, including the Chinese UHPC Code (draft), Chinese standards JGJ/T 465-2019 and JTG 3362-2018, Swiss standard SIA 2052-2016, and French standard NF P18-710-2016. The research was based on two comprehensive databases of 110 reinforced and 47 prestressed UHPC beams. Cor-relation analysis of the model errors of the flexural capacity formulae was conducted at first. Then, the reliability of the prediction models was analyzed through Monte Carlo simulation (MCS) and first-order second-moment (FOSM) method, considering the design parameters such as material strength, live-to-dead load ratio, longitu-dinal reinforcement ratio, and prestressing tendon ratio. The results indicated that the prediction model in Chinese UHPC Code (draft) could accurately predict the flexural capacity of reinforced and prestressed UHPC beams among the five specifications, with the mean model errors of 1.06 and 1.02, respectively. The reliability indexes of Chinese UHPC Code (draft), Swiss standard SIA 2052-2016, and French standard NF P18-710-2016 for both the reinforced and prestressed UHPC beams were significantly higher than the specified value of 4.2 in the Chinese standard. The sensitivity analysis showed that the reliability index increased with the increase of live-to-dead load ratio, but it was not significantly influenced by UHPC compressive strength. In addition, the reliability index decreased as the longitudinal reinforcement ratio and prestressing tendon ratio increased. Material partial factor of flexural resistance of the formula in Chinese UHPC Code (draft) was calibrated, and gamma c= 1.30 was recommended for UHPC beams for safety.
引用
收藏
页数：17
相关论文
共 86 条
[31]  
Kamal M.M., 2014, HBRC Journal, V10, P55, DOI 10.1016/j.hbrcj.2013.09.008
[32]  
Li H., 2022, Eng Mech, V37, P131
[33]  
Li L, 2010, Mechanical behavior and design method for reactive powder concrete beams
[34]  
[李立峰 Li Lifeng], 2018, [土木工程学报, China Civil Engineering Journal], V51, P84
[35]  
[梁兴文 Liang Xingwen], 2019, [工程力学, Engineering Mechanics], V36, P110
[36]  
Liu C, 2016, Eng Constr, V48, P6, DOI DOI 10.13402/J.GCJS.2016.04.002
[37]  
[刘超 Liu Chao], 2018, [同济大学学报. 自然科学版, Journal of Tongji University. Natural Science], V46, P744
[38]  
Lu S, 2013, Experimental and theoretical research on high strength steel reactive powder concrete beam
[39]  
Ma X, 2019, J Ningxia University(Natural Science Edition, V40, P130
[40]   Shear behavior of fiber-reinforced ultra-high performance concrete beams [J].
Meszoely, Tamas ;
Randl, Norbert .
ENGINEERING STRUCTURES, 2018, 168 :119-127
123456789