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Xia C.,Hunan Communications Research Institute
Advanced Materials Research | Year: 2012

On the base of modal synthesis theory, the self-compiling vehicle-bridge coupling vibration analysis program was used to analyze the vehicle dynamic response and passing vehicle riding comfort of cable-stayed bridge. Compared with the impact of different factors on vehicle riding comfort, this method provides a useful theoretical reference to correlated evaluation research and management maintenance. The influence of driving speed on comfort is not obvious. The research makes reference to correlated project evaluation in procedure and method. © (2012) Trans Tech Publications, Switzerland.

Deng L.,Hunan University | Yan W.,Hunan University | Zhu Q.,Hunan Communications Research Institute
Journal of Bridge Engineering | Year: 2016

Expansion joints will experience increasing deterioration and damage under repeating vehicle loading. A severely damaged expansion joint will induce significant dynamic vehicle load effects on the bridge deck near the expansion joint, whereas it may not cause such a large effect on the global bridge responses, e.g., deflection and bending moment at the bridge midspan. The impact factors (IMs) in bridge design codes are usually determined from global bridge responses. Therefore, it may be inappropriate to use the IMs in bridge design codes for the design of deck slabs for which the transverse bending moment is usually the controlling internal force. In this study, a three-dimensional vehicle-bridge model is used to study vehicle impact on the deck slab of prestressed concrete box-girder bridges caused by damaged expansion joints. Results show that the damage condition of expansion joints has a significant effect on the vehicle impact on the bridge deck slab, whereas it has a limited effect on the global bridge responses, especially for long bridges. The relationships between the vehicle impact on the deck slab and a few important parameters are also investigated, and some useful conclusions are obtained. © 2015 American Society of Civil Engineers.

Tan Y.-Z.,China Three Gorges University | Tan Y.-Z.,CAS Wuhan Institute of Rock and Soil Mechanics | Kong L.-W.,CAS Wuhan Institute of Rock and Soil Mechanics | Guo A.-G.,CAS Wuhan Institute of Rock and Soil Mechanics | Wan Z.,Hunan Communications Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

In order to simulate the subgrade deformation caused by the coupling effect of wetting and traffic loads, the traditional wetting deformation test method is improved, and a set of upgraded wetting-deformation equipments are developed. It is regarded that the wetting deformation is generated by the loss of matrix suction, and a constitutive relationship between lost matric suction and wetting deformation deduced. Finally, the wetting-deformation regularity and modulus are studied by using the improved device. The results show that the initial compaction state of laterite has significant effect on the deformation, and the process can be divided into three stages: initiation, acceleration and stability ones. Deformation of the specimen without wetting mainly occurs at the initiation stage, while the wetting deformation of the specimen mainly occurs at the acceleration stage.

Xia C.Y.,Hunan Communications Research Institute
Applied Mechanics and Materials | Year: 2014

This paper analyzes the impact factor, combined with practical engineering experience to extract the main influencing factors, and based on research data on the major beneficial factor for statistical analysis to understand trends from the road cost; selection of multiple linear regression model, the unit cost per lane kilometer as the dependent variable, the cost factor as independent variables, the cost estimate to build the macro-factor model and the cost of each grade highway microeconomic factors estimation model. © (2014) Trans Tech Publications, Switzerland.

Xia C.Y.,Hunan Communications Research Institute
Applied Mechanics and Materials | Year: 2013

Influences on properties of the concrete highway pavement were analyzed in this paper, and the optimal formulation materials were gotten to use in the repair of used-broken cement blocks in the experiment. Polyurethane concrete material was prepared, combing the ordinary concrete technology with one-step method of the synthesis of polyurethane hard bubble, and then its mechanical properties of the relevant parameters were measured to determine the optimal preparation program. The results show that the polyurethane concrete also has sufficiently good mechanical properties while it has the characteristic of fast patching. © (2013) Trans Tech Publications, Switzerland.

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