Zhejiang Institute of Architectural Design and Research

Hangzhou, China

Zhejiang Institute of Architectural Design and Research

Hangzhou, China

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Zhang H.,Hohai University | Gao Y.,Hohai University | Li F.,Hohai University | Lu F.,Zhejiang Institute of Architectural Design and Research
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

Improved split Hopkinson pressure bar test device and microscope were used to study the dynamic characteristics of polypropylene fiber reinforced concrete (PFRC). The uniaxial impact experiments under different strain rates on PFRC with five fiber contents were carried out. The effects of strain rate and fiber contents on concrete's strength, toughness, elastoplasticity and other index were analyzed according to the stress-strain curves. The damage of two kinds of fiber content concrete after different impact speed was observed and the mechanism of damage evolution and the effect of different strain rate and fiber contents on the damage were analyzed by means of the microscope. The constitutive model of PFRC was obtained based on the introduction of damage viscoelastic constitutive model and analysis of test results. The analysis results show that fiber reinforced concrete is of the properties of non-linear and sensitivity of strain rate under impact loads as ordinary concrete. Dynamic strength and toughness of fiber reinforced concrete develop nonlinearly and follow the parabolic trend with the increase of fiber contents and the speed of damage evolution decreases with the increase of strain rate. The dynamic stress-strain relation of fiber reinforced concrete is described well by the damage viscoelastic constitutive model.


Ren X.-H.,Hunan University | Ren X.-H.,Zhejiang Institute of Architectural Design and Research | Huo J.-S.,Hunan University | Chen B.-S.,Hunan University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

Drop weight equipment together with a purpose-built furnace was used to experimentally study the behavior of concrete-filled steel tubular (CFT) beams in fire. The influences of fire duration time and impact energy on the impact resistance behavior of CFT beams in fire were discussed. The temperature versus time relationships of core concrete and steel tube surface, the impact force and lateral deformation versus time relationships of the tested specimens, and the residual lateral deformations were measured. The test results showed that a CFT beam in fire has an excellent impact resistance behavior; the bending level and plastic zone of the specimens increase with increase in fire duration time, but reduce obviously with decrease in impact energy; the ultimate impact force increases with increase in fire duration time, but reduces with decrease in impact energy. The results could be used to evaluate the anti-collapse behavior of CFT beams and provided a reference for their design.


Huo J.,Hunan University | Ren X.,Hunan University | Ren X.,Zhejiang Institute of Architectural Design and Research | Xiao Y.,Hunan University | Xiao Y.,University of Southern California
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

Drop weight setup was employed to experimentally study the behavior of concrete-filled steel tube (CFT) subjected to ISO-834 standard fire. The influences of fire duration time, impact velocity, impact energy and steel ratio on the impact resistance of CFT exposed to fire were discussed. The temperature histories of steel tube surface were measured and the force and compressive deformation histories of the specimens were recorded. The test results showed that fire duration time, impact velocity, impact energy and steel ratio significantly affected the impact behavior of CFT columns under fire, with the fire duration time being the most sensitive. However, the influence of other parameters on the ultimate impact strengths of the hot CFT columns was not significant. The residual deformations increased with the increase of fire duration time and impact energy, but decreased with the increase of steel ratio. Although the CFT specimens at room temperature or under fire suffered remarkable compressive deformations, the composite columns still remained good integrity. The test results showed that CFT under fire has an excellent impact resistance, thus is suitable to resist impact loads and collapse-induced dynamic loads.


Zhang H.,Hohai University | Gao Y.,Hohai University | Li F.,Hohai University | Lu F.,Zhejiang Institute of Architectural Design and Research | Sun H.,Columbia University
European Journal of Environmental and Civil Engineering | Year: 2013

An improved Split Hopkinson pressure bar (SHPB) test device was used to study the dynamic characteristics and the constitutive relationships of polypropylene fibre-reinforced concrete (PFRC). The uniaxial SHPB impact experiments of PFRC with five fibre contents under different strain rates were conducted. The effects of strain rates and fibre contents on concrete strength and toughness were then analysed according to the experimental stress-strain curves. The constitutive model of PFRC was obtained according to the damage viscoelastic constitutive model and fitting of test data. Experimental results show that PFRC has non-linear properties and is sensitive to strain rates under impact loads. Dynamic strength and toughness of PFRC grow non-linearly following a parabolic trend as the fibre contents increasing. The dynamic stress-strain relationship of PFRC can be well described by the damage viscoelastic constitutive model in this paper. © 2013 Taylor and Francis.

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