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Feng P.,Tsinghua University | Zhou Z.,China Building Technique Group Co. | Tian Y.,Tsinghua University | Ye L.,Tsinghua University
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering

An improved splice method for mid-diameter steel bars (10-16 mm) used in RC structures was developed, which can make the installation more easily and economic through the hybrid connection of welding and overlapping. In order to study the mechanical behavior of welding-overlap splices, a total of 138 steel bar splice tests were conducted, including both the steel-concrete interaction group and the lonely-steel group. Through the splice tensile experiment, the failure model and ultimate strength of the improved splice was summarized. Meanwhile, the failure mechanism was analyzed by the FEM analysis. The test results show that: hybrid connection of welding and overlapping is a simpler splice method which can realized the reliable splice in the RC structures, the ultimate load of the improved splice is sufficient for the application and the failure model is reasonable. Base on the test results, some suggestions for application were given. The economic analysis of a real application case is conducted, which shows a good prospect of proposed connection. Source

Wu Y.,China Building Technique Group Co. | Guo X.D.,Beijing University of Technology
Applied Mechanics and Materials

Based on the research of domestic and foreign sports park design, This paper introduced the planning of a sports and leisure park in Huangcun Town, Daxing District, Beijing. The design scheme revolved on four aspects: the planning concept, the overall layout, the design of single building, the landscape design. All the aspects are strived to achieve harmony for natural and humane, ecological and landscape, tradition and modern. © (2013) Trans Tech Publications, Switzerland. Source

Ye J.L.,Hangzhou Residential Development Center Co. | Chen S.C.,Hangzhou Residential Development Center Co. | Bao L.Q.,China Building Technique Group Co.
Applied Mechanics and Materials

Shear displacement method is used to predict the settlement of the grouted pile in this paper. An empirical relationship is used to determine the improvement of shear modulus for the soil around the grouted pile. A parameter is also proposed to represent the improvement of the shear modulus for the grouted soil at the pile tip. Shear displacement method is modified to consider the influence of grouting. The detailed calculation process of the method is described and determine of the parameter is also given in the paper. © (2013) Trans Tech Publications, Switzerland. Source

Ma Y.-Y.,Metro Land Corporation Ltd | Duan J.,China State Construction Technical Center | Shao H.,China Building Technique Group Co.
Applied Mechanics and Materials

In this paper, the two methods for the finite element analysis of foundation excitationwould be proved mathematically equivalent. Although the two methods, i.e. the method of degree-of-freedomtransformation and the Lagrange multiplier method,are absolutely different in appearance, but their mathematical essence would be proved completely identical. In other words, although the equations derived from the two methods have different degree-of-freedoms, i.e. the latter much more than the former, while in essence they could be deduced from each other and vice versa. And finally a numerical example will be presented and discussedto demonstrate the correctness of the present theory. © (2014) Trans Tech Publications, Switzerland. Source

Fang K.,Zhejiang University | Xia T.,Zhejiang University | Bao L.,China Building Technique Group Co. | Ye J.,Hangzhou Residential Development Center Co. | Chen S.,Hangzhou Residential Development Center Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering

Due to progressive blocking of cement grains within the soil matrix, filtration of grout plays a significant role during grout dispersion process. The influence of filtration on the grout dispersion in gravel is studied. The injectability criterion of the grout is first summarized. Then the linear filtration law is introduced into the mass balance relationships of water, cement and soil to develop a cement grout dispersion model in spherical coordinates with account for filtration. The comparison between model results and experimental data proves the validity of the given model and the necessity of considering the phenomenon of filtration. In addition, the influences of filtration on permeation grouting under different injection durations and water-cement ratios are also studied. The results reveal that the penetration resistance increases gradually due to grout filtration, leading to the increase in grouting pressure with time. For grout with smaller water-cement ratio, the grouting pressure is larger and the influence of filtration is more obvious. Source

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