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	1. Piezoresistivity of carbon fiber reinforced cement-matrix composites
	Zhao Xiaohua,Li Guobao,Wang Yulin,Li Gengying
	Civil and Architectural Engineering 09 February 2010
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	Abstract:Both positive and negative piezoresistivity occur in cement-matrix composites containing short carbon fibers due to the variation of moisture content in the composites. For most cases the electrical resistivity of the composites decreases monotonically upon longitudinal compression, and piezoresistivity tends to be positive. However, its magnitude varies. Lower moisture content leads to stronger piezoresistivity. When moisture content is in a specific range, the electrical resistivity of the composites increases monotonically upon compressive strain, and piezoresistivity tends to be negative. This effect is much stronger than positive piezoresistivity. The transition from positive to negative piezoresistivity is observed. It is proposed that the occurrence of these phenomena is attributable to decreases in both pore network connectivity and capillary porosity during compression.
	TO cite this article:Zhao Xiaohua,Li Guobao,Wang Yulin, et al. Piezoresistivity of carbon fiber reinforced cement-matrix composites[OL].[ 9 February 2010] http://en.paper.edu.cn/en_releasepaper/content/40099


	2. Effects of Content Level and Particle Size of Nickel Powders on Piezoresistivity of Smart Cement-based Composites
	Han Baoguo,Ou Jinping
	Civil and Architectural Engineering 26 January 2010
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	Abstract:The piezoresistivity of cement-based composites have attracted a lot of research attention due to its potential application in structural health monitoring. In order to explore the effects of content level and particle size of nickel powders on the piezoresistivity of cement-based composites, the electrical resistivity of cement-based composites containing nickel powders with particle sizes in the range of 3-7μm, 2.6-3.3μm and 2.2-2.8μm was measured and its variation under uniaxial compression was studied. The differences in electrical conductivity and piezoresistivity of these composites were investigated by examining the morphology of composites using scanning electron microscope. The experimental results show that content level and particle size of nickel powders are two key factors that influence the piezoresistivity of cement-based composites, which are due to the different conductive characteristics of the composites. It is also found that the cement-based composite containing 24 vol.% of nickel powder with particle size in the range of 3-7μm possesses moderate electrical conductivity and the best piezoresistivity among cement-based composites with different content levels and particle sizes of nickel powders.
	TO cite this article:Han Baoguo,Ou Jinping. Effects of Content Level and Particle Size of Nickel Powders on Piezoresistivity of Smart Cement-based Composites[OL].[26 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39506

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	3. Smart Composite Based on Field Emission and Tunneling Effects and Its Piezoresistive Characteristic Model
	Han Baoguo,Ou Jinping
	Civil and Architectural Engineering 26 January 2010
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	Abstract:A smart composite is fabricated from cement-matrix and spiky spherical nickel powders. The electrical resistivity of such composite decreases 69.00% under uniaxial compression. The gage factor of this composite is higher than 895.45 within the elastic regime. This ultrahigh piezoresistivity is attributed to the unique needle-like surface morphology of nickel powers. Comparing to the normal smooth spherical nickel particles, the needle-like features of spiky spherical nickel particles can induce field emission and tunneling effects, which leads to highly sensitive responses to strain. A constitutive model relating the change in electrical resistivity to strain of the composite is built within the elastic regime. This model incorporates the field emission effect and the inter-particle separation change of nickel powders in composite. The model is used to predict the piezoresistive characteristic behavior of the composite. The predicted result is compared with the experimental data obtained on the composite, and good agreement is obtained.
	TO cite this article:Han Baoguo,Ou Jinping . Smart Composite Based on Field Emission and Tunneling Effects and Its Piezoresistive Characteristic Model[OL].[26 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39485


	4. Nonlinear Responses Analysis of Pipe-soil Contact Surface
	Jin Liu
	Civil and Architectural Engineering 02 November 2009
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	Abstract:It’s necessary to consider interaction between buried pipeline and soil when analyzing its structure between pipe and soil, which comes down to the slip & separation phenomena and the determination of contact stress distribution at the contact-surface. A three-dimensional finite element analysis model of pipeline-soil system is established with nonlinear contact method under ground permanent deformation. The pipeline is considered as the space thin-shell elements, while the soil surrounding is regarded as solid elements, respectively. The responses at the interface between pipe and soil under fault movement are analyzed with finite element method. The relationship between nonlinear response of the interface and fault displacement, buried depth, ratio of pipe-diameter and wall-thickness & field condition is studied through example analysis. Besides, the contact stress at the interface is researched, and it is founded that intense nonlinear response of the pipe and soil take place near the fault. And pipe friction tangential stress far from the fault reduces as a \"parabolic\" type of approach, rather than to reduce the linear regressive.
	TO cite this article:Jin Liu. Nonlinear Responses Analysis of Pipe-soil Contact Surface [OL].[ 2 November 2009] http://en.paper.edu.cn/en_releasepaper/content/36301


	5. Cyclic Performance of Steel Beam to Square Concrete Filled Steel Tubular Column Joints
	Wang Wen-Da,Han Lin-Hai
	Civil and Architectural Engineering 06 March 2009
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	Abstract:A finite element method (FEM) study is conducted herein to simulate the cyclic behaviour of steel beam to concrete filled steel tubular (CFST) column joints under a constant axial load and a cyclically increasing lateral load to simulate forces. The finite element program ABAQUS was used for the analysis. A plastic damage model for concrete and elasto-plastic model for steel were used to simulate the damage and degradation of the materials. Eight specimens of steel beam to square concrete-filled steel tubular (CFST) joints using an external ring were tested to assess the hysteretic behaviour under combined constant axial load and cyclical lateral load. The axial load level of the CFST column, width of connection stiffening ring were considered as influential experimental parameters to the seismic behaviour of the specimens. The lateral load (P) versus lateral deformation (Δ) hysteretic curves showed no obvious strength deterioration and stiffness degradation. It can be concluded that the joints exhibited good seismic performance. It was also found that the axial load level had an influential effect on both the strength and seismic behaviour of the joints. The lateral ultimate strength of the joints reduced and the displacement ductility and the energy dissipation capacity decreased with an increased axial load level. Furthermore, the failure mode of the joints changed from a plastic hinge in the beam end to fracture in the ring zone. The eight specimens tested were analysed using a FEM model. The results obtained from the FEM model showed reasonable agreement with the experimental results.
	TO cite this article:Wang Wen-Da,Han Lin-Hai. Cyclic Performance of Steel Beam to Square Concrete Filled Steel Tubular Column Joints[OL].[ 6 March 2009] http://en.paper.edu.cn/en_releasepaper/content/29979


	6. Progressive Collapse Analysis and Safety Assessment for Large-span Steel Truss Roof
	Jiang Xiao-Feng,Chen Yi-Yi
	Civil and Architectural Engineering 23 July 2008
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	Abstract:Due to initial local failures in accident events, domino phenomena or even progressive collapse might arise in some vulnerable structures, and consequently, robustness or collapse resistance becomes one important requirement in structural design. Because of its low redundancy, truss roof used in large-scale public buildings is one system different from that of frame and bearing wall, of which plentiful literatures can be achieved. In order to discover its potential risk, progressive collapse analysis is carried out in this paper using sophisticated tool LS-DYNA, and its redistribution mechanism of internal forces, dynamic response and failure modes are investigated. The conceptions of sensitivity element and key element are put forward to identify different responses of members due to initial failures. Finally, a Safety Assessment Method (SAM) based on static linear analysis is proposed to evaluate collapse resistance performance of truss structures.
	TO cite this article:Jiang Xiao-Feng,Chen Yi-Yi. Progressive Collapse Analysis and Safety Assessment for Large-span Steel Truss Roof[OL].[23 July 2008] http://en.paper.edu.cn/en_releasepaper/content/23028


	7. Simulation of Material’s Damage and Safety Parameters’Variation by Image Processing Method
	PANG Huandong,ZHU Jihua
	Civil and Architectural Engineering 27 March 2008
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	Abstract:Material＇s crack always starts from the most non-homogeneous position while it is under exterior force. By combining image＇s ightness and element＇s strength, an artificial material had been made up and its breakage process is simulated and the probable crack has been worked out through edge detection method. The further process of the image proves the rule of displacement, damage and fractal variation that the value of damage and fractal increases with the growth of the crack while the augment rates are different. And the displacement orientation is consistent with that of lightness gradient, which is meaningful and revelatory to discover the law of breakage.
	TO cite this article:PANG Huandong,ZHU Jihua. Simulation of Material’s Damage and Safety Parameters’Variation by Image Processing Method[OL].[27 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19794


	8. Numerical Solutions of Various Cables And Their Applications
	Yang Yuemin
	Civil and Architectural Engineering 18 December 2007
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	Abstract:This article discusses the curves of all kinds of cables and their mechanical properties. The solution of the cable is adopted to analyze the effect of the cable\\\\\\\
	TO cite this article:Yang Yuemin. Numerical Solutions of Various Cables And Their Applications[OL].[18 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17075


	9. Numerical evaluation of equivalent static wind Loads of Long-span Roofs
	Haiyang Wu
	Civil and Architectural Engineering 09 July 2007
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	Abstract:In this paper, the complexity of calculating the equivalent static wind loads of long-span roofs is demonstrated on the basis of the present research situation of structural equivalent static wind load. The concept of equivalent static wind loads of extreme effects is proposed, and the numerical methods to calculate equivalent static wind loads of extreme effects of long-span roofs are presented. This paper particularly points out that it is possible to obtain the accurate displacement equivalent static wind loads, but the precise internal force equivalent static wind loads do not usually exist. Taking the cantilevered roofs of two large-scale stadiums for examples, the results obtained indicate the method proposed in this paper is practicable and convenient.
	TO cite this article:Haiyang Wu. Numerical evaluation of equivalent static wind Loads of Long-span Roofs [OL].[ 9 July 2007] http://en.paper.edu.cn/en_releasepaper/content/13954


	10. Research on Lower Coherence Interferometer and corresponding optic fiber sensor
	Chengyu HONG,Jian-hua Yin,You-hua Fan,Chao Wang
	Civil and Architectural Engineering 26 June 2007
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	Abstract:Applying lower coherence interferometer executes scan of optic fiber sensor under different environmental state. Factors influence accuracy of results can be obtained through comparison between above tests, which are shown in details in this paper. Repeating test of optic fibers is completed as a part of calibration, an accuracy of 4 can be achieved as well. Data acquisition and data analysis are accomplished by the software of Labview. Installing reference point on signal arm to eliminate the deviation of initial scan time and reduce the error of lower coherence system.
	TO cite this article:Chengyu HONG,Jian-hua Yin,You-hua Fan, et al. Research on Lower Coherence Interferometer and corresponding optic fiber sensor[OL].[26 June 2007] http://en.paper.edu.cn/en_releasepaper/content/13686

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