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Explosion resistance performance of reinforced concrete box girder coated with polyurea:Model test and numerical simulation

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Defence Technology（防务技术） 2024年第3期33卷 1-18页

作者： Guangpan Zhou Rong Wang Mingyang Wang Jianguo Ding Yuye Zhang School of Science Nanjing University of Science and TechnologyNanjing 210094JiangsuChina School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation Army Engineering University of PLANanjing 210007JiangsuChina

To study the anti-explosion protection effect of polyurea coating on reinforced concrete box girder,two segmental girder specimens were made at a scale of 1:3,numbered as G(without polyurea coating)and PCG(with polyurea coating).The failure characteristics and dynamic responses of the specimens were compared through conducting explosion tests.The reliability of the numerical simulation using LS-DYNA software was verified by the test results.The effects of different scaled distances,reinforcement ratios,concrete strengths,coating thicknesses and ranges of polyurea were studied.The results show that the polyurea coating can effectively enhance the anti-explosion performance of the girder.The top plate of middle chamber in specimen G forms an elliptical penetrating hole,while that in specimen PCG only shows a very slight local dent.The peak vertical displacement and residual displacement of PCG decrease by 74.8% and 73.7%,respectively,compared with those of specimen G.For the TNT explosion with small equivalent,the polyurea coating has a more significant protective effect on reducing the size of fracture.With the increase of TNT equivalent,the protective effect of polyurea on reducing girder displacement becomes more significant.The optimal reinforcement ratio,concrete strength,thickness and range of polyurea coating were also drawn.

关键词： Explosive load Explosion resistance performance Model test Polyurea concrete box girder Numerical simulation

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Vertical temperature gradients of concrete box girder caused by solar radiation in Sichuan-Tibet railway

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第5期23卷 375-387页

作者： Tao SHI Xing-wang SHENG Wei-qi ZHENG Ping LOU School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-Speed Railway Construction Technology Changsha 410075China MOE Key Laboratory of Engineering Structures of Heavy Haul Railway Central South UniversityChangsha 410075China

Spatial and temporal temperature variations are critical for concrete box girders,and non-uniform temperature distributions induced by solar radiation depend on the structural shapes and shadows cast on them.There have been many studies of temperature distributions and temperature gradients of concrete box girders,but few have considered a high altitude plateau climatic environment.In this study,the nonlinear temperature distributions of concrete box girders in the Sichuan-Tibet railway caused by solar radiation were investigated based on experimental analysis,real-time shadow-selection algorithm,and finite element method.Furthermore,a vertical temperature gradient model of the concrete box girders was obtained.The vertical temperature gradient values first rise,then decrease,and finally rise again from Chengdu to Lhasa,with samples forming a normal distribution.The recommended vertical temperature gradient value was 25℃with a confidence interval of 95%.This provides a reference for the design and maintenance of concrete box girders on the Sichuan-Tibet railway.

关键词： concrete box girder Solar radiation Temperature gradient Sichuan-Tibet railway Probability statistics

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维普期刊数据库

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Temperature variation of concrete box girder bridge

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Frontiers of Structural and Civil Engineering 2009年第4期3卷 407-413页

作者： Jian WANG Zhi FANG Wuhan Municipal Engineering Design Institute Wuhan 430015China College of Civil Engineering Hunan UniversityChangsha 410082China

On the basis of theoretical analysis and measurement on site,the temperature gradients and its variation on concrete box girder bridges resulting from ambient temperature,solar radiation,and structural temperature fields were discussed.With the help of the heat transfer theory and finite element method(FEM),the heat flux of the surface of concrete box girder was carried out,and all the heat fluxes were described as the convection.The results were compared with that from field measurements,and a good correlation was found.It was revealed that the methods,the parameters,the boundary condition used in this paper were reasonable.Last,some conclusions were obtained,which could provide the basis for box girder design under solar radiation.

关键词： concrete box girder solar radiation convection finite element method(FEM) temperature variation

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