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Lead spall velocity of fragments of ultra-high-performance concrete slabs under partially embedded cylindrical charge-induced explosion

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Defence Technology（防务技术） 2023年第5期23卷 50-59页

作者： Yi Fan Li Chen Heng-bo Xiang Qin Fang Fang-yu Han State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjingJiangsu210007China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjingJiangsu211189China State Key Laboratory of high performance Civil Engineering Materials NanjingJiangsu211103China

When an explosion occurs close to or partially within the face of a concrete structure, fragments are rapidly launched from the opposite face of the structure owing to concrete spalling, posing a significant risk to nearby personnel and equipment. To study the lead fragment velocity of ultra-high-performance concrete(UHPC), partially embedded explosion experiments were performed on UHPC slabs of limited thickness using a cylindrical trinitrotoluene charge. The launch angles and velocities of the resulting fragments were the determined using images collected by high-speed camera to document the concrete spalling and fragment launching process. The results showed that UHPC slabs without fiber reinforcement had a fragment velocity distribution of 0-118.3 m/s, which are largely identical to that for a normal-strength concrete(NSC) slab. In addition, the fragment velocity was negatively correlated to the angle between the velocity vector and vertical direction. An empirical Eq. for the lead spall velocity of UHPC and NSC slabs was then proposed based on a large volume of existing experimental data.

关键词： ultra-high-performance concrete Reinforced concrete slabs Explosion Fragment velocity Blast resistance

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Shear behavior of ultra-high-performance concrete beams prestressed with external carbon fiber-reinforced polymer tendons

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1426-1440页

作者： Li JIA Zhi FANG Maurizio GUADAGNINI Kypros PILAKOUTAS Zhengmeng HUANG College of Civil Engineering Hunan UniversityChangsha 410082China Key Laboratory for Wind and Bridge Engineering of Hunan Province Changsha 410082China Department of Civil and Structural Engineering The University of SheffieldSheffield S13JDUK Guizhou Transportation Planning Survey and Design Academe Co.Ltd. Guiyang 550003China

The ultra-high-performance concrete(UHPC)and fiber-reinforced polymer(FRP)are well-accepted high-performance materials in the field of civil *** combination of these advanced materials could contribute to improvement of structural performance and corrosion ***,only limited studies are available for shear behavior of UHPC beams reinforced with FRP bars,and few suggestions exist for prediction methods for shear *** paper presents an experimental investigation on the shear behavior of UHPC beams reinforced with glass FRP(GFRP)and prestressed with external carbon FRP(CFRP)*** failure mode of all specimens with various shear span to depth ratios from 1.7 to 4.5 was diagonal tension *** shear span to depth ratio had a significant influence on the shear capacity,and the effective prestressing stress affected the crack *** experimental results were then applied to evaluate the equations given in different codes/recommendations for FRPreinforced concrete structures or UHPC *** comparison results indicate that NF P 18-710 and JSCE CES82 could appropriately estimate shear capacity of the slender specimens with a shear span to depth ratio of ***,a new shear design equation was proposed to take into account the effect of the shear span to depth ratio and the steel fiber content on shear capacity.

关键词： beam external prestressing ultra-high-performance concrete fiber-reinforced polymers shear behavior design equation

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performance of steel bridge deck pavement structure with ultra high performance concrete based on resin bonding

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Frontiers of Structural and Civil Engineering 2021年第4期15卷 895-904页

作者： Hui ZHANG Zhixiang ZHANG Peiwei GAO Lei CUI Youqiang PAN Kuan LI Special Pavement Technology Center Jiangsu SinoRoad Engineering Research InstituteNanjing211805China College of Civil Avlation Nanjing University of Aeronautics and AstronauticsNanjing210016China

This research investigated a pavement system on steel bridge decks that use epoxy resin(EP)bonded ultra-high performance concrete(UHPC).Through FEM analysis and static and dynamic bending fatigue tests of the composite structure,the influences of the interface of the pavement layer,reinforcement,and different paving materials on the structural performance were compared and *** results show that the resin bonded UHPC pavement structure can reduce the weld strain in the steel plate by about 32%and the relative deflection between ribs by about 52%under standard axial load conditions compared to traditional *** EP bonding layer can nearly double the drawing strength of the pavement interface from 1.3 MPa,and improve the bending resistance of the UHPC structure on steel bridge decks by about 50%;the bending resistance of reinforced UHPC structures is twice that of unreinforced UHPC structure,and the dynamic deflection of the UHPC pavement structure increases exponentially with increasing fatigue *** fatigue life is about 1.2×10^(7) cycles under a fixed force of 9 kN and a dynamic deflection of 0.35 mm,which meets the requirements for fatigue performance of pavements on steel bridge decks under traffic conditions of large flow and heavy load.

关键词： steel bridge deck pavement ultra-high-performance concrete epoxy resin composite structure bending fatigue performance

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