Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure

Song, Chaojie; Zhang, Gang; Hou, Wei; He, Shuanhai

doi:10.1177/1369433219898102

Cited by 20 publications

(4 citation statements)

References 23 publications

(28 reference statements)

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“…With the advancement of science and technology and the improvement of the national economic level, China's bridge construction has entered a glorious period [ 1 ]. As early as 2005, the total mileage of highways in China reached 1.9 million km, the total mileage of expressways exceeded 35,000 km, and the total number of highway bridges exceeded 330,000 [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Yan

2022

International Journal of Analytical Chemistry

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In order to solve the problem of vehicle-bridge coupling vibration of a continuous semisteel bridge, the main bridge type of long-span prestressed concrete girder bridge, the author proposes a bridge safety test system based on the dynamic and static load test. The system combines the change of stress and deflection with the vibration amplitude of the bridge body, and using the modeling assistant in large-scale finite element software MIDAS/CIVIL, a three-dimensional finite element real bridge model is established, including input of section data, the input of boundary conditions, and the input of loads. The result obtained is as follows: the structural verification coefficient of the control strain of the main girder under each working condition is not greater than 1.0, indicating that the flexural rigidity of the structure meets the design requirements. In addition, under each working condition, the ratio of the residual strain after unloading to the measured total strain is less than 20%. Under each working condition, the deflection calibration coefficient of each control section is less than 1.0, and the ratio of residual deflection to total deflection of each measuring point is at most 3.9%; each residual deflection is small. The damping ratios are all less than 5% of the empirical damping ratio of concrete members, indicating that the bridge structure is in good condition. The result obtained by the author is compared with the standard allowable value and the theoretical calculation value, so as to provide a basis for the study of the bearing capacity of similar bridges and to verify the standardization and rationality of the existing bridge structural design.

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Section: Introductionmentioning

confidence: 99%

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Yan

2022

International Journal of Analytical Chemistry

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“…The first step is to conduct fluidsolid coupling heat transfer analysis. Subsequently, the temperature distribution, generated from thermal analysis, is enforced on the structural model as nodal load to simulate the thermal effect of PC box bridge girders at its early hydration age (Song et al 2020).…”

Section: Numerical Modelmentioning

confidence: 99%

Effect of pipe-cooling system on thermal-mechanical behaviour of PC box bridge girders at hydration age

Song

Zhang

Wen

et al. 2020

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Prestressed concrete (PC) box bridge girders on the pier top is prone to generate thermal cracks due to large inner-outer temperature difference at hydration age. This paper presents an approach for investigating behaviour of PC box bridge girders at early age of curing. First, based on measured data from a typical PC box bridge girder, an inverse analysis method for adiabatic temperature rise function of concrete hydration heat is proposed using genetic algorithm and thermal analysis. Then, a thermo-hydro-mechanical coupling model is established, using the computer program ANSYS incorporating time-dependent wind speed and ambient temperature, to analyse thermal mechanical behaviour of PC box bridge girders considering pipecooling system. Subsequently, parametric studies are carried out to evaluate influence of cooling time, cooling water flow rate, cooling water temperature and cooling period on temperature and stress of PC box bridge girders during curing. Results from analysis show that the principal tensile stress generated in the vicinity of pipe increases more rapidly during cooling, while the temperature and principal tensile stress can be significantly reduced when cooling is terminated. Increasing cooling time, cooling water flow rate or decreasing cooling water temperature can reduce the highest temperature. However, unreasonable value of these cooling parameters will cause PC box bridge girders cracking due to excessive principal tensile stress around pipe. Both one-stage and two-stage cooling are effective measures to minimize the adverse effects of hydration heat in PC box bridge girders.

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“…Prestressed concrete transverse large cantilever continuous (PCTLCC) box girder bridges are widely constructed for their rational working performance, outstanding span adaptability, and structural economy to meet the requirements of modern infrastructure in traffic conditions [ 1 , 2 , 3 ]. The box girder section can effectively lighten the self-weight of the structures and provide high torsional rigidity to resist the torsion under eccentric load [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Internal Forces Analysis of Prestressed Concrete Box Girder Bridge by Using Structural Stressing State Theory

et al. 2021

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This paper analyzes the working behavior characteristics of a prestressed concrete transverse large cantilever continuous (PCTLCC) box girder bridge model based on structural stressing state theory and the numerical shape function (NSF) method. At first, the normalized generalized strain energy density (GSED) is established to model the stressing state of the bridge model. Subsequently, the Mann Kendall (M–K) criterion is applied to detect three characteristic loads, respectively, elastic–plastic branch load P (200 kN), failure load Q (300 kN), and progressive failure load H (340 kN), and the failure load Q is found to be the starting load of the damage process of the bridge model, rather than the ultimate load where the structure has been destroyed. Finally, the NSF method is adopted to interpolate the test data, and a detailed analysis for the variation characteristics of the working behavior of the bridge model under loads is performed based on the interpolation results. The characteristic load detection method and experimental data extension method for PCTLCC box girder bridge established in this study can provide valuable references for the design and analysis of such bridges.

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Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure

Cited by 20 publications

References 23 publications

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Effect of pipe-cooling system on thermal-mechanical behaviour of PC box bridge girders at hydration age

Internal Forces Analysis of Prestressed Concrete Box Girder Bridge by Using Structural Stressing State Theory

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