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Cheng Y.,Nanjing Southeast University | Cheng Y.,Nanjing University of Aeronautics and Astronautics | Gong W.,Nanjing Southeast University | Zhang X.,China Highway Planning and Design Institute Consultants Inc | Dai G.,Nanjing Southeast University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

For the reason of construction, some deterring factors will be brought out such as residue and mud cake for bored pile. Post grouting under pile tip can reduce the deterring factor, and the bearing performance of the bored pile will be improved. Effect on the bearing performance of the super-long and large-diameter bored pile by post grouting under the pile tip was studied by a series of tests including the static loading test, CT test and coring test. The self-balanced method was adopted in the static loading test. The bearing performances of the same pile before grouting and after grouting were compared. In the same field, the bearing performances of the piles were compared. Dimensions of the piles were the same, one had been post grouted under the pile tip and the other had not been post grouted. According to the results of the static loading tests, the resistance of the pile tip was raised, and the friction of a finite scope of pile side above pile tip was also raised. So the whole bearing capacity of the pile was raised. By the post grouting under the pile tip, not only the bearing capacity of the whole pile was raised, but also the rigidity of the pile was raised which make the settlement of pile be easier to control. CT test and coring test both approved the effect of post grouting under pile tip. The effect of post grouting would be better when the grout was injected in the sand layer.


Wang Z.,China Highway Planning and Design Institute Consultants INC. | Xu C.,China Highway Planning and Design Institute Consultants INC. | Wu H.,China Highway Planning and Design Institute Consultants INC.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

Chongqi Bridge, with span arrangement of 102m+4×185m+102m and total length of 944m, is a six-span twin deck continuous steel box girder bridge. Some possible vertical vortex-induced vibration has been identified in Wind tunnel tests. Therefore, TMD (Tuned Mass Damper) are carefully selected to restrain the undesirable vibration that may occur in service stage via comprehensive comparison of active control and passive control technical solutions. Based on dynamic characteristics calculation and wind tunnel test, the first-order dissymmetric vertical vibration modal was detected as main vortex-induced vibration mode. According to such mode, the preliminary locations of TMD devices were determined. Mechanical properties of TMD, such as frequency, mass, damping ratio and displacement range were carried out by theoretical and numerical analysis. Damping effect was verified by harmonic response method and time-history method, and the main difficulties and design solution of low frequency TMD was indicated. To guide the installation of TMD, parameter sensitivity analysis for frequency, mass and damping ratio were analyzed. Installation tolerance of main design parameters were defined, and acceptance check indicators were provided. Chongqi bridge is the first bridge to using TMD control for vortex-induced vibration in China. The research results can provide reference for compiling of design specifications about vortex-induced vibration control, inspection & evaluation, and manufacturing of TMD. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.


Sun S.,Chang'an University | Gao J.,China Highway Planning and Design Institute Consultants INC | Huang P.,Chang'an University
Advanced Materials Research | Year: 2013

In order to determine every rational construction state and obtain perfect finished dead state of the cable-stayed bridge, a quadratic programming model for optimizing cable tension was put forward. The adjustment of multi-object control parameters was achieved by using the weighting coefficient in the optimization model. In the optimization calculation of a cable-stayed bridge, the forward-calculating method was used and the results show that mechanics concept of this method is definite, the rate of convergence is fast and some disadvantages of other methods are avoided. © (2013) Trans Tech Publications, Switzerland.


Nie J.-G.,Tsinghua University | Zhu L.,Tsinghua University | Tao M.-X.,Tsinghua University | Tang L.,China Highway Planning and Design Institute Consultants Inc.
Journal of Constructional Steel Research | Year: 2013

Shear strength of trapezoidal corrugated steel webs is an important issue for the design of box girder bridges with trapezoidal corrugated steel webs. Eight H-shape steel girders with trapezoidal corrugated webs are firstly tested to investigate the shear behavior of webs. An extensive parametric study based on the linear elastic buckling analysis is then conducted to derive the simplified formula for calculating the elastic shear buckling strength of trapezoidal corrugated steel webs considering three different shear buckling modes. The proposed formula can give more satisfactory results for predicting the elastic shear buckling strength than some available formulae provided in the literature when compared with the numerical results. Furthermore, the nonlinear buckling analysis is conducted to intensively investigate the shear strength associated with initial geometric imperfections, and the formulae of the shear strength are proposed. Good agreements can be observed between the results calculated using the proposed prediction formula in this paper and the experimental results, and a design formula is also recommended for the routine shear design of trapezoidal corrugated steel webs. © 2013 Elsevier Ltd.


Li Z.-S.,Beijing Jiaotong University | Lei J.-Q.,Beijing Jiaotong University | Zhang K.,Beijing Jiaotong University | Xiao Y.,Beijing Jiaotong University | Lin D.-J.,China Highway Planning And Design Institute Consultants Inc
Applied Mechanics and Materials | Year: 2013

Because of solar radiation and the atmospheric temperature rise, the temperature change of the steel box girder bridge be larger. Thermal conductivity and sensitivity to the temperature change of steel is very good. The impact of temperature effect can be compared with the dead and live load under certain circumstances. Taking a bridge as example, the relative deformation of flat steel box-shaped girder is analyzed with the finite element analysis software. The results can be reference for other bridges. © (2013) Trans Tech Publications, Switzerland.


Cui B.,China Highway Planning and Design Institute Consultants Inc. | Dong M.,China Highway Planning and Design Institute Consultants Inc. | Li Z.,China Highway Planning and Design Institute Consultants Inc.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

Bridge with corrugated steel webs is a new type of bridge structure. There is a good development perspective for this type of bridge because of its rational structure, convenient construction and fine economy. It is still in initial stage of investigation for design and construction of bridges with corrugated steel webs, with limited experience. On the Base of ChuHe Bridge(53 m+96 m+53 m, continuous beam bridge with variable cross section) in the project of the forth Yangtze river bridge in Nanjing and the domestic and foreign experiences, the theory on the structure of corrugated steel webs is analyzed and the bridge is calculated by solid model. General design of long-span PC continuous beam bridge with variable cross section and corrugated steel webs is expatiated in this paper; the detail design is put forward by structure and durability analysis. And looking forward to be useful for the designing of corrugated steel webs bridge by the following experience and providing reference in the future.


Nie J.,Tsinghua University | Zhu L.,Tsinghua University | Tang L.,China Highway Planning and Design Institute Consultants Inc.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The shear strength of trapezoidal corrugated steel webs is an important parameter for the design of box girder bridges with trapezoidal corrugated steel webs. Eight H-shaped steel beams with trapezoidal corrugated steel webs are tested to preliminarily investigate the shear behavior of trapezoidal corrugated steel webs. In addition, current formulae for calculating the elastic shear buckling strength and ρ-λs curve are discussed. Finite element models are developed in order to find the critical factors dominating the elastic shear buckling strength and ρ-λs curve. Furthermore, extensive numerical calculations and parametric analyses are conducted to derive the simplified formulae for calculating the elastic shear buckling strength and ρ-λs curve of trapezoidal corrugated steel webs. The predictions obtained using the proposed formulae correlate well with the numerical results. Finally, six experimental programs of H-shaped steel beams with trapezoidal corrugated steel webs are selected to validate the proposed simplified formulae. Good agreements can be observed, and the proposed simplified formulae are useful in routine design practices.

Loading China Highway Planning and Design Institute Consultants Inc. collaborators
Loading China Highway Planning and Design Institute Consultants Inc. collaborators