Dec 2007, Volume 1 Issue 4
    

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  • State-of-the-art of long-span bridge engineering in China
    XIANG Haifan, GE Yaojun
    2007, 1(4): 379-388. https://doi.org/10.1007/s11709-007-0051-x
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    This paper introduces the state-of-the-art of longspan bridge engineering in China with emphases on recent long-span bridge projects, bridge deck configuration and material, design codes of long-span bridges and improvement of aero
  • In quest of the origin of ancient northern city of China: An implication from the Book of Odes
    DAI Fudong
    2007, 1(4): 389-392. https://doi.org/10.1007/s11709-007-0052-9
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    Sorting out some paragraphs in the Book of Odes (collection of the earliest poetry in China), this paper makes analysis of the formation, construction process and technology of the ancient northern city of China. Relevan
  • Consumption of carbon fiber plates in the reinforced concrete beams strengthened with CFPs
    BU Liangtao, SHI Chuxian, SONG Li
    2007, 1(4): 393-398. https://doi.org/10.1007/s11709-007-0053-8
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    Four-point bending flexural tests were conducted to one full-size reinforced concrete (RC) beam and three full-size RC beams strengthened with carbon fiber plates (CFPs). The experimental results showed that the consumption of CFP
  • Experimental study on fire protection methods of reinforced concrete beams strengthened with carbon fiber reinforced polymer
    HU Kexu, HE Guisheng, LU Fan
    2007, 1(4): 399-404. https://doi.org/10.1007/s11709-007-0054-7
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    In this paper, two reinforced concrete (RC) beams strengthened with carbon fiber reinforced polymer (CFRP) and attached with thick-painted fire resistant coating were tested for fire resistance following the standard fire testing procedures. The experimental results show that the specimen pasted with the insulated layer of 50 mm in thickness could resist fire for 2.5 h. It is also demonstrated that the steel wire mesh embedded in the insulated layer can effectively prevent it from cracking and eroding under firing.
  • Dynamic simulation based optimized design method of concrete production system for RCC dam
    ZHAO Chunju, ZHOU Yihong
    2007, 1(4): 405-410. https://doi.org/10.1007/s11709-007-0055-6
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    The construction system of roller compacted concrete (RCC) dam is running according to a series of connected procedures which are highly impacted and interacted consisting with the resource level. Therefore, a dynamic simulation mode
  • Application of fractal theory to unsaturated soil mechanics
    XU Yongfu, TONG Lixin
    2007, 1(4): 411-421. https://doi.org/10.1007/s11709-007-0056-5
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    The mechanical properties of unsaturated soils are a function of the saturation degree or matric suction, and can be obtained based on currently available procedures. However, each procedure has its limitations and consequently, care should be taken in the selection of a proper procedure. The fractal approach seems to be a potentially useful tool to describe hierarchical systems and is suitable to model the structure and hydraulic properties of unsaturated soils. In this paper, the soil-water characteristics, unsaturated hydraulic conductivity function, unsaturated shear strength, swelling deformation and compression were derived from the fractal model for the pore-size distribution, and were expressed by only two independent physical parameters, the fractal dimension and the air entry value. The predictions of the proposed soil-water characteristics, unsaturated hydraulic conductivity, unsaturated shear strength, swelling deformation and compression were in good agreement with published experimental data. Comparisons between the experimental results of unsaturated hydraulic conductivity and the predictions of the both fractal model and the van Genuchten-Mualem model were also performed, and it was found that the predictions of the fractal model were better than that of the van Genuchten-Mualem model.
  • Experimental investigation of the influence on static and cyclic deformation of structural soft clay of stress level
    CHEN Yunmin, CHEN Yingping, HUANG Bo
    2007, 1(4): 422-429. https://doi.org/10.1007/s11709-007-0057-4
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    This paper presents the experimental results performed to study the static and cyclic deformation behavior of undisturbed and remolded soft clays sampling from Xiaoshan. The consolidation tests indicated that the vertical strains of
  • Seismic ground motion analysis of Shanghai Pudong Airport site considering the effects of spatial correlation and irregular topography
    JIANG Tong, CHEN Laiyun, XING Hailing, L? Xilin
    2007, 1(4): 430-435. https://doi.org/10.1007/s11709-007-0058-3
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    The terminal No. II of Shanghai Pudong International Airport is located at Pudong District of Shanghai City near shore of East China Sea, and the area of the long-span terminal is 400 m × 200 m. The construction site of the terminal locates on the irregular topography, and its alluvium achieves about 300 m in thickness. The spatial correlation of seismic ground motion, as well as the amplification of soft alluvium and the effect of irregular topography, should be considered. This paper uses a simplified method to obtain the response spectrum of the engineering bedrock under the irregular topography. The spectrum is used to generate the sets of spatially correlative horizontal and vertical seismic motions. The surface ground motion was calculated under incidence of the spatially correlative seismic motion by 2D finite element method (FEM) model considering nonlinear properties of the soil by means of the equivalent linear method. In order to compare the effect of 2D irregular topography, the seismic response analysis of 1D model is carried out by using the equivalent linear method. For indicating the effect of the spatial correlation of input motions, the horizontal uniform inputs, as well as the horizontal and vertical uniform input are carried out for the seismic response analysis of the site. Finally, some characteristics of seismic ground motion calculated for previously mentioned cases are compared.
  • Explicit finite element method for calculation and analysis to the elasto-plastic dynamic response of fluid-saturated porous media
    LI Liang, DU Xiuli, LI Liyun, ZHAO Chenggang
    2007, 1(4): 436-442. https://doi.org/10.1007/s11709-007-0059-2
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    In order to describe the elasto-plastic dynamic response of fluid-saturated porous media, the incremental elasto-plastic wave propagation equations of fluid-saturated porous media are developed by the fundamental theory of continuum mechanics and appointing to the characteristic of fluid-saturated porous media. Then, the space discretization of these equations is performed to get their Galerkin formula. At last, the time discretization of this formula is carried out with the integral method which consists of central difference method and Newmark constant average acceleration method to get the explicit time integral formula for solving the wave propagation equations of porous media. On the basis of the integral formula mentioned above, the time-domain explicit finite element method is developed for calculation and analysis of the elasto-plastic dynamic response of fluid-saturated porous media. In this method, the decoupling technique is adopted and it does not need to solve simultaneous linear equations in each time step, so the computational effort and memory requirement can be reduced considerably by using this method.
  • New model of load transfer function for pile analysis based on disturbed state model
    LIU Qijian, YANG Linde, WU Jun
    2007, 1(4): 443-447. https://doi.org/10.1007/s11709-007-0060-9
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    Based on the disturbed state concept (DSC), a new model of load transfer function for pile analysis is established by the idea that the deformed material between pile and soil can be treated as a mixture of two constituent parts, which are in intact or critical state and assumed to obey random distribution. Starting from the homogenization theory of heterogeneous materials and statistics method, a parameter D to describe the disturbance degree is proposed, and a formula to determine the parameter has been derived by using the plastic displacement of a pile as distribution variable. In the model, shear intensity of elements in an intact state are simulated by Duncan-Zhang model and that in a critical state by Mohr-Coulomb criterion. The model of this paper has few parameters, which can reflect the aspects of load transfer function, such as hardening, softening and the effects of confining pressure. The well agreement between the in-situ data and the predicted shows that the validity of the model herein. So the proposed model in this paper is easy to be used in engineering practice.
  • Experimental measurement of double-K fracture parameters of concrete with small-size aggregates
    ZHANG Xiufang, XU Shilang, ZHENG Shuang
    2007, 1(4): 448-457. https://doi.org/10.1007/s11709-007-0061-8
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    The double-K fracture model can well describe the development of cracks undergoing during the entire fracture process in concrete. Therefore, it has been selected as the theoretical basis of the Norm for fracture test of
  • Analysis of effect of different construction methods of piles on the end effect on skin friction of piles
    ZHOU Hongbo, CHEN Zhuchang
    2007, 1(4): 458-463. https://doi.org/10.1007/s11709-007-0062-7
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    Based on the comparative analysis of end effect on skin friction of displacement-pile (driven pile), the end effect on skin friction of bored pile is studied. The end effect on skin friction between driven pile and bored pile is different and the end effect on skin friction of bored pile is reduce of skin friction in the soil layer adjacent to the pile end. The degradation degree of skin friction is deduced with the increase of the distance from pile end. The concept of additional mud cake formed by the effect of cushion at the bottom of borehole during pouring concrete is introduced to explain the mechanism of end effect on skin friction of the bored pile. The test results of post-grouting piles indicate that the post-grouting technique is an effective way to improve the end effect on skin friction of bored pile.
  • Iterative finite element model of nonlinear viscoplastic analyses for blended granular porous media
    WU Yuching, ZHU Cimian
    2007, 1(4): 464-473. https://doi.org/10.1007/s11709-007-0063-6
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    The iterative finite element model, in which an element is used to represent a single particle, is generated to analyze the global behavior of multiple-material aggregates of materially nonlinear viscoplastic particles. The genera
  • Conservation and adaptive-reuse of historical industrial building in China in the post-industrial era
    WANG Jianguo, JIANG Nan
    2007, 1(4): 474-480. https://doi.org/10.1007/s11709-007-0064-5
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    The conservation and adaptive-reuse of historical industrial building is one of the most important issues to be solved in today s urban development and construction in China. In this paper, the necessity and academic meaning of the conservation and adaptive-reuse of historical industrial building were discussed by reviewing its development rend both at home and abroad, and the basic contents of the implementation of the conservation and adaptive-reuse of historical industrial building in China with specific cases provided were analyzed. It is the central task for China to put forward the restructuring and design methods, assessment principles and relevant core technical specifications based on the empirical researches on the historical industrial building and site.
  • Conservation and adaptive reuse of industrial heritage in Shanghai
    ZHANG Song
    2007, 1(4): 481-490. https://doi.org/10.1007/s11709-007-0065-4
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    This paper takes a retrospective review of the evolution of the conservation of industrial heritage in urban Shanghai since the 1990s within the context of the international industrial heritage conservation movement, with the emph