AI Chat Paper
Discover the SciOpen Platform and Achieve Your Research Goals with Ease.
Search articles, authors, keywords, DOl and etc.
{{expandStatus?'Exit ':''}}Advanced Search
In-service reinforced concrete bridges, following prolonged operational periods, frequently undergo alterations in structural integrity and significant deterioration of material properties. As a result, it becomes imperative to evaluate and analyze these bridge structures. This study focuses on a specific in-service concrete bridge and employs finite element simulation analysis to investigate the failure behavior and degradation of load-bearing capacity in concrete beam bridge structures. The research examines the impact of various crack distributions and types, specifically addressing the effects of bending and shear cracks on the failure behavior and degradation of load-bearing capacity in concrete bridge structures. Load simulations are conducted on the bridge, revealing that bending cracks exert a relatively minor influence on the failure mode of the structures. The load-deflection curves demonstrate minimal variation across different crack heights, indicating that the structures do not experience abrupt brittle failure, and their structural performance is largely optimized in this context. Conversely, shear cracks have a pronounced effect on the failure mode of the bridge structures. Notably, when the crack height reaches 0.6h, the load-deflection curve exhibits a significant alteration, leading to brittle failure attributed to shear cracks, thereby indicating that the structural performance is not fully realized. Given that the deformations in cracked bridge structures comprise two components, stiffness reduction formulas are introduced. Utilizing the stiffness reduction formula outlined in the standard (JCT3362—2018) for cracked components, a formula for calculating residual load-bearing capacity is derived. Calculations pertaining to the mid-span section load-bearing capacity of the selected bridge reveal deviations within 5%. This study offers a valuable methodology and reference for assessing the residual load-bearing capacity of reinforced concrete bridges exhibiting crack damage.
Morcos, S.S. Fracture modeling of concrete and steel[J]. Journal of Structural Engineering, 1995, 121(7): 1125–1133.
Castel, A., Vidal, T., Francois, R. Finite-element modeling to calculate the overall stiffness of cracked reinforced concrete beams[J]. Journal of Structural Engineering, 2012, 138(7): 889–898.
Ismail, Z., Kuan, K.K., Yee, K.S., et al. Examining the trend in loss of flexural stiffness of simply supported RC beams with various crack severity using model updating[J]. Measurement, 2014, 50: 43–49.
Benakli, S., Bouafia, Y., Oudjene, M., et al. A simplified and fast computational finite element model for the nonlinear load-displacement behavior of reinforced concrete structures[J]. Composite Structures, 2018, 194(15): 468–477.
Zhao, Y., Zhou, B., He, S.H., et al. Damage stiffness assessment method based on fracture characteristics of PC simply-supported beam[J]. Journal of Chang’an University (Natural Science Edition), 2011, 31(4): 39–44.
Liang, P., Wang, X.L., Lou, C.H., et al. Rapid evaluation of load-bearing capacity of concrete beam bridge based on crack feature library[J]. China Journal of Highway and Transport, 2014, 27(8): 32–41,72.
Wang, L.B., Zhao, Y. Analysis of residual bearing capacity of cracked prestressed concrete continuous box bridges[J]. Journal of Railway Science and Engineering, 2015, 12(1): 127–131.
Li, Y.J., Wu, X.G., Huang, C., et al. Calculation of transverse load distribution coefficient of assembled girder bridge considering main girder damage[J]. Journal of Railway Science and Engineering, 2019, 16(6): 1459–1465.
Zhu, J.L., Wang, P., Chen, B. Model test study on characteristic parameters evolution of prestressed T beams with multiple cracks[J]. Technology of Highway and Transport, 2021, 37(6): 66–72.
Vecchio, J.F., Shim, W. Experimental and analytical reexamination of classic concrete beam tests[J]. Journal of Structural Engineering, 2004, 130(3): 460–469.
Li, Y., He, S.H., Yan, L. Stiffness degradation analysis on existing bridge with web cracks[J]. Journal of Wuhan University of Technology, 2018, 40(2): 79–83.
Sui, Y., Cheng, X.H., Zhao, Z.Z. Research on cracking failure process of concrete components using total strain crack constitutive model[J]. Journal of Building Structures, 2023, 44(7): 216–224.
Feng, Q., Wu, X.G. Effect of crack statistical parameters of pc bridge on structure[J]. Journal of Highway and Transportation Research and Development, 2017, 34(2): 88–92.
Wang, J.H., Shi, Z.H., Nakano, M. Strength degradation analysis of an aging RC girder bridge using FE crack analysis and simple capacity-evaluation equations[J]. Engineering Fracture Mechanics, 2013, 108: 209–221.
Yu, Z.N., He, S.H., Ren, L.P., et al. Research on residual bearing capacity calculation method and changing law of damaged prestressed concrete box girder[J]. China Journal of Highway and Transport, 2021, 34(9): 242–252.
Zhou, Y.J., Zhao, Y., Zhou, Y., et al. Full-scale experiment on stiffness degradation and identification of prestressed concrete box girders[J]. China Journal of Highway and Transport, 2020, 33(3): 107–118.
This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).
京公网安备11010802044758号