Monitoring random vehicle load information-based time-varying reliability analysis of PC bridge considering concrete cyclic creep effects

Abstract

During the long-term service periods of Prestressed Concrete(PC) continuous girder bridges, structural time-varying reliability will degrade due to cyclic creep induced by dynamic vehicle loading, which increases the risk of structural failure. This paper provided a time-varying reliability prediction method for the prestressed concrete continuous T-girder bridge considering random vehicle load information and cyclic creep information. Firstly, the random vehicle load information is simulated with Monte Carlo random simulation method and MATLAB software based on the monitored data obtained from weigh-in-motion (WIM) system. Then, the concrete shrinkage strain model, concrete static creep strain model, concrete cyclic creep strain model and the overall strain model are respectively provided by combining the CEB-FIP model with concrete cyclic creep theory. Finally, by using a numerical model of prestressed concrete bridge, a time-variant reliability analyzing approach of prestressed concrete T-girder bridge considering the limit state of load carrying capacity and the limit state of serviceability is investigated in detail by integrating the random vehicle loading information with the concrete cyclic creep information.

Keywords

Structural engineering / Random vehicle load model / Cyclic creep / Time-varying reliability analysis

References

[1] Au FTK, Si XT. Accurate time-dependent analysis of concrete bridges considering concrete creep, concrete shrinkage and cable relaxation. Eng Struct, 2011, 33(1): 118-126.

[2] Chen ZH, Guo T, Zhou GD, Liu XW, Fu YZ, Liu H. Time-dependent reliability assessment of long-span PSC box-girder bridge considering vehicle-induced cyclic creep. J Bridge Eng, 2023, 28(4): 04023011.

[3] Han B, Xiang TY, Xie HB. A bayesian inference framework for predicting the long-term deflection of concrete structures caused by creep and shrinkage. Eng Struct, 2017, 142: 46-55.

[4] Lu PZ, Li DG, Tao H, Chen YR, Shi Q. Concrete performance time-varying effect of CFST arch bridges. Mech Time-Depend Mater, 2021, 26(2): 1-19

[5] Luo Y, Zheng H, Zhang HP, Liu Y. Fatigue reliability evaluation of aging prestressed concrete bridge accounting for stochastic traffic loading and resistance degradation. Adv Struct Eng, 2021, 24(13): 3021-3029.

[6] Ma YS, Wang YF. Creep influence on structural dynamic reliability. Eng Struct, 2015, 99: 1-8.

[7] Specifications for design of highway reinforced concrete and prestressed concrete bridges and culverts(JTG 3362–2018) (2018) Ministry of transport of the People's Republic of China

[8] Tonelli D, Beltempo A, Cappello C, Bursi OS, Zonta D. Reliability analysis of complex structures based on Bayesian inference. Struct Health Monit, 2023, 22(5): 3481-3497.

[9] Tong T, Zhao L, Zhang J, Q Yu (2016) Long-term performance of prestressed concrete bridges under the intertwined effects of concrete damage, static creep and traffic-induced cyclic creep. Eng Struct 127:510–524

[10] Tu B, Fang Z, Dong Y, Frangopol DM. Time-variant reliability analysis of widened deteriorating prestressed concrete bridges considering shrinkage and creep. Eng Struct, 2017, 153: 1-16.

[11] Yuan YG, Han WS, Li GL, Xie Q, Guo Q. Time-dependent reliability assessment of existing concrete bridges including non-stationary vehicle load and resistance processes. Eng Struct, 2019, 197: 109426-109426.

[12] Zhou H, Fan XP, Liu YF, Lu DG. Time-variant reliability analysis of simply supported PC girder bridges considering shrinkage, creep, resistance degradation and vehicle load flows. Structures, 2023, 56104885

Funding

Fundamental Research Funds for the Central Universities(lzujbky-2025-05)

National Natural Science Foundation of China(51608243)

RIGHTS & PERMISSIONS

The Author(s)