Time-dependent Camber Deformation Reliability of High-speed Railway PSC Box Girder Considering Creep Effect

被引：0
|
作者：
Zou H. [1 ]
Lu Z. [1 ]
Yu Z. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
来源：
Tiedao Xuebao | 2019年 / 6卷 / 107-114期
关键词：
Camber deformation; Creep effect; Method of moment; Prestressed concrete box girder; Time-dependent reliability;
D O I：
10.3969/j.issn.1001-8360.2019.06.015
中图分类号：
学科分类号：
摘要：
Based on the creep coefficient model recommended by Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG 3362-2018), this paper proposed a performance function for the reliability assessment of midspan camber deformation of high-speed railway prestressed concrete (PSC) box girder. Using the performance function, a time-dependent reliability analysis of the midspan camber deformation of PSC box girder based on the third-moment method was developed. The results of the comparison with Monte Carlo simulation demonstrate that the reliability method developed in this paper greatly improves the computational efficiency without loss of accuracy. The results of time-dependent reliability also show that the time-dependent reliability index is in a low state after the end of tension of the prestressing tendons and the growth of the time-dependent reliability tends to be stable after the second stage of dead load. It is suggested to improve the midspan camber deformation reliability considering the creep effect by properly decreasing the eccentricity of prestressing force to reduce the stress difference between upper margin and lower margin of the girder, so as to better satisfy the requirements of safe, smooth, and comfortable operation of high-speed train. © 2019, Department of Journal of the China Railway Society. All right reserved.
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页码：107 / 114
页数：7
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