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steel bar penetrating cervical spinal canal without neurological injury:A case report

World Journal of Clinical Cases 2024年第17期12卷 3214-3220页

作者： Qin Zhang Tao Ding Xiao-Feng Gu Yi Liu Department of Orthopedics The Affiliated Wuxi People’s Hospital of Nanjing Medical UniversityWuxi 214023Jiangsu ProvinceChina

BACKGROUND We report a rare case of cervical spinal canal penetrating trauma and review the relevant *** SUMMARY A 58-year-old male patient was admitted to the emergency department with a steel bar penetrating the neck,without signs of neurological *** tomography(CT)demonstrated that the steel bar had penetrated the cervical spinal canal at the C6–7 level,causing C6 and C7 vertebral body fracture,C6 left lamina fracture,left facet joint fracture,and penetration of the cervical spinal *** steel bar was successfully removed through an open surgical procedure by a multidisciplinary *** the surgery,we found that the cervical vertebra,cervical spinal canal and cervical spinal cord were all severely *** CT demonstrated severe penetration of the cervical spinal canal but the patient returned to a fully functional level without any neurological *** Even with a serious cervical spinal canal penetrating trauma,the patient could resume normal work and life after appropriate treatment.

关键词： Cervical spinal canal Penetrating trauma steel bar Neurological deficit Case report

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Accelerating Effect of Wetting-Drying Cycles on steel bar Corrosion in Concrete

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Journal of China University of Mining and Technology 2005年第3期15卷 197-202页

作者： LI Guo YUAN Ying-shu LI Fu-min School of Architecture and Civil Engineering China University of Mining and Technology Xuzhou Jiangsu 221008 China

Raining and sun-shining processes in natural climate were simulated by water spraying and infrared lightshining alternately as wetting-drying cycles in accelerated durability test. The accelerating effects of the wet-ting-drying cycles and the variation of corrosion current density and corrosion potential of steel bar in concrete undersuch conditions were studied. The result shows that the main reason leading to accelerating corrosion of steel bar inconcrete is the wetting-drying cycles, which can cause the increase of corrosion potential difference between the an-ode and cathode of steel bar corrosion cell and the decrease of concrete resistance. Corrosion rate of the steel bar inconcrete under four typical conditions, including wetting-drying cycle, long time submerging in water, long time ex-posure to indoor and outdoor environment were measured and compared. The test results indicate that the corrosionrates under the four typical conditions are in the order of spraying and infrared light shining cycles, outdoor environ-ment, indoor environment, and submerging in water, respectively.

关键词： wetting-drying cycle concrete steel bar corrosion rate

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Experimental Study on the Axial Compression Performance of Bamboo Scrimber Columns Embedded with steel Reinforcing bars

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SDHM Structural Durability and Health Monitoring 2024年第6期18卷 805-833页

作者： Lin X. Wu M. Li G. Guo N. Mei L. College of Civil Engineering and Transportation Northeast Forestry University Harbin 150000 China Department of Building Engineering College of Civil Engineering Tongji University Shanghai 200092 China College of Transportation and Civil Engineering Fujian Agriculture and Forestry University Fuzhou 350002 China

In this paper, a new type of bamboo scrimber column embedded with steel bars (rebars) was proposed, and the compression performance was improved by pre-embedding rebars during the preparation of the columns. The effects of the slenderness ratio and the reinforcement ratio on the axial compression performance of reinforced bamboo scrimber columns were studied by axial compression tests on 28 specimens. The results showed that the increase in the slenderness ratio had a significant negative effect on the axial compression performance of the columns. When the slenderness ratio increased from 19.63 to 51.96, the failure mode changed from strength failure to buckling failure, and the maximum bearing capacity decreased by 43.03%. The axial compression performance of the reinforced bamboo scrimber columns did not significantly improve at a slenderness ratio of 19.63, but the opposite was true at slenderness ratios of 36.95 and 51.96. When the reinforcement ratio increased from 0% to 4.52%, the bearing capacity of those with a slenderness ratio of 51.96 increased by up to 16.99%, and the stiffness and ductility were also improved. Finally, based on existing specifications, two modification parameters, the overall elastic modulus Ec and the combined strength fcc, were introduced to establish a calculation method for the bearing capacity of the reinforced bamboo scrimber columns. The calculation results were compared with the test results, and the results showed that the proposed calculation models can more accurately predict the bearing capacity. © 2024 The Authors.

关键词： axial compression performance Bamboo scrimber column steel bar theoretical model

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Electrically Conductive Concrete for Heating Using steel bars as Electrodes

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Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 523-526页

作者：侯作富 School of Mechanical Engineering Yangtze University

The steel bars with good electrical conductivity were used as two kinds of electrodes in the making of carbon fiber（CF） electrically conductive concrete for *** results of the pertinent experiments illustrate the design is *** change in electrical resistivity over three years＇ hydration time was studied when steel bars were used as lateral face electrodes and top bottom surface electrodes *** temperature rise test was conducted to verify the heating properties of two kinds of *** only the study can reduce the CF volume content of electrically conductive concrete for heating to 0.58% or 0.36% according to different design,but also it will enhance the carrying capacity of the concrete roadway for heating.

关键词： steel bar carbon fiber electrical resistivity temperature rise

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Numerical study on explosion-induced fractures of reinforced concrete structure by beam-particle model

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Science China(Technological Sciences) 2011年第2期54卷 412-419页

作者： LIU Jun ZHAO ChangBing YUN Bin Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 China Key Institute of Engineering Safety and Disaster Prevention College of Civil and Transportation Engineering Hohai University Nanjing 210098 China 3 Geotechnical Research Institute Hohai University Nanjing 210098 China

In the field of disaster prevention mitigation and protection engineering,it is important to identify the mechanical behaviors of reinforced concrete(RC)under explosive load by simulation.A three dimensional beam-particle model(BPM),which is suitable to simulate the fracture process of RC under explosive load,has been developed in the frame of discrete element method (DEM).In this model,only the elastic deformations of beams between concrete particles were *** matrix displacement method(MDM)was employed to describe the relationship between the deformation and forces of the beam.A fracture criterion expressed by stress was suggested to identify the state of the beam.A BPM for steel bar,which can simulate the deformation of steel bar under high loading rate,was also developed based on the Cowper-Symonds theory.A program has been coded using C++*** of RC slab under explosive load were carried out using the *** agreement was achieved between the experimental and simulated *** is indicated that the proposed theoretical model can well simulate the fracture characteristics of RC slab under explosive load such as blasting pit formation,cracks extension, spallation formation,etc.

关键词： explosive load reinforced concrete slab beam-particle model steel bar high loading rate fracture

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