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Li Y.,Southwest Jiaotong University | An W.,Southwest Jiaotong University | An W.,Hebei Provincial Communications Planning and Design Institute | Li C.,Southwest Jiaotong University | Liao H.,Southwest Jiaotong University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

Super-long-span bridges are sensitive to natural winds. Wind-resistant performance is the control factor in the design of super-long-span bridges. The three-box-girder deck is typical form for the super-long-span bridge. However, little research results on aerodynamic characteristics of three-box-girder deck are published. Six kinds of aerodynamic measures are designed for the three-box-girder deck. The aerostatic stability and the flutter stability are compared to study the effects of different aerodynamic measures on the aerodynamic characteristics of the three-box-girder deck. And suggestions about aerodynamic measures arrangement methods are presented which can rovide references for aerodynamic optimization of super-long-span bridges. Source

Wang X.-M.,Hebei Provincial Communications Planning and Design Institute | Wang X.-M.,Hebei University of Technology | Zheng Y.-H.,Water Resources University
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

Since the concept of representative elementary volume (REV) of fractured rock masses is fundamental and significant in rock mechanics, it is worth studying by researchers. This paper critically reviews the latest research achievements in the field of REV of fractured rock masses. Three main aspects are discussed, which are research viewpoints and its relevant parameters, research approaches and quantitative methods. Firstly, from the point view of studying REV, the geometrical parameters of discontinuities and rock blocks, the mechanical and hydraulic parameters of rock masses are investigated in detail. Secondly, the applied conditions, merits and drawbacks of research approaches are briefly introduced, including statistical, analytical and numerical methods. Finally, the quantitative methods for determination of REV, i. e., intuitive judgment, error and coefficient of variation prediction, hypothesis tests, curve fitting and grey correlation analysis, are summarized. This paper provides reference and guidance for relevant studies. © 2015, Academia Sinica. All right reserved. Source

Xun J.,Changan University | Xiang H.,Hebei Provincial Communications Planning and Design Institute | Peng J.,Changan University
MATEC Web of Conferences | Year: 2015

The plate girder bridge accounts for a large proportion of bridge types for its advantages of simple structure and convenience in construction. However, during the service stage, it is easy to suffer the hinge joint diseases, which badly weaken the integral rigidity of superstructure and affect the operation safety of the bridge. This paper presents a treatment technology for hinge joint diseases without interrupting traffic, and the main operation steps and key points of the technology are summarized. Through an example of the reinforcement of a plate girder bridge, the deformation data before and after the reinforcement is measured and compared, which verifies the effectiveness of the method. © Owned by the authors, published by EDP Sciences, 2015. Source

Mu H.,Hebei Provincial Communications Planning and Design Institute
Applied Mechanics and Materials | Year: 2012

The author of this article gives a detailed description of the basic situation of the coastal expressway, focusing on the characteristics and engineering properties of soft soil as well as a in-depth analysis of the successful soft soil foundation treatment technology using cement mixing pile. This article provides useful reference for engineers facing similar situation. © (2012) Trans Tech Publications, Switzerland. Source

Zhang Y.,Changan University | An H.,Changan University | Yang R.,Changan University | Peng J.,Changan University | Wang Q.,Hebei Provincial Communications Planning and Design Institute
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

Based on the local climate characteristics, traffic conditions and engineering material characteristics, the influence of the grading, the type and the dosage of the mineral fiber, warm mixing agent and forming temperature on the mixture performance used in the thin overlay is studied. The construction technology of the asphalt mixture in low temperature is analyzed. The method solving the practical engineering problems arising from thin overlay such as heat loss easily, temperature decrease excessively fast and compaction difficultly is put forward by applying the warm mix asphalt fiber mixture, which provides an important engineering guidance for improving the quality of the thin overlay and prolonging the service life of the road. Source

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