Applied Mechanics and Materials Vols. 204-208

Abstract: Coal gangue is a byproduct of mining process, filling the gangue in the road embankment can reduce the pollution caused by the gangue accumulation. Because the formation and type of rock is different, the performance of gangue is different. In this paper, the main types of gangue of Handan & Xingtai coal mining area was taken laboratory test, the mechanical properties and chemical properties of different gangues were compared to determine the feasibility of gangue filling in the road embankment, and the performance law of coal gangue.

Abstract: We conducted a survey about the representative six sections of Beijing-Zhuhai expressway, including channelized traffic conditions and the corresponding traffic for this highway. And we were statistically analyzed to survey results. We had a new understanding to the operational status of domestic highway. Lane design for the pavement structure provided a theoretical basis.

Abstract: With the traffic infrastructure increasing in China, the techniques for concrete structures have to not only meet the design requirements but also improve its requirements of appearance quality in bridge engineering. The appearance quality requirements of As-cast Finish Concrete has become highway project structure standard; And we successfully developed the multi-function DGT-1 spraying wall composite steel template through the designs of different templates and contrast test research of template surface treatment; Engineering has proved that concrete structure used the template pouring not only can reach the requirements of As-cast Finish Concrete in appearance quality, but also have larger of advantages in turnover number, convenience of using, speeding up engineering progress, environmental protecting, and savings costs.

Abstract: Early damage of the bridge deck pavement has become one of the major diseases which effecting the play of using function of expressway and inducing traffic accidents. For the concrete conditions, which may happen during the construction of entitative engineering for the bridge deck pavement on Yellow River 2nd Bridge in Zhengzhou, the article has analyses the pertinence measures that it need to take timely. In addition, it introduces the pre-construction preparation, the control emphasis during the construction and the basis and standard for quality inspection. What’s more, it makes a deep research for the asphalt paver and the compaction technology. The results of test after the deck has been running for three years shows that the indexes of the project meet the standards, and the quality of the construction is well.

Abstract: In order to protect the stay cable and to construct it easily in Cable-stayed Bridge, the cable ends are equipped with cable tubes. The dip and the coordinates of cable tubes lying in the main beam are changing in the process of cantilever cradle construction. The theoretical orientation parameters must be corrected during construction to ensure that the cable tube coordinates with the cable. Aimed at obtaining alignment parameters of the cable tubes, the paper analyzed the various factors affecting cable tube positioning and the importance of them, derived correction formula of cable tubes positioning and elucidated it with dip and the coordinates correction, verified the calculation combining with Nan Ping Bridge engineering practice.

Abstract: The calculation formula of the vertical fundamental frequency of arch bridge has been given in current design codes, in which the rise-span ratio is the only variable on condition that the structure mass and stiffness are known. However, the dynamic properties of long-span concrete filled steel tube arch bridges have their own characteristics, which are influenced by a series of factors. Thus this article establishes a space model of a concrete-filled steel tube arch bridge. By analyzing the main design parameters’ influence on the structure dynamic properties, including rise-span ratios, arch-axis coefficient and wide-span ratios, some of conclusions has been made, which can be used for further research of the impact effect and earthquake dynamic response, and provide the necessary basis for the dynamic design of bridges of this kind

Abstract: Currently, probabilistic deterioration modeling techniques have been employed in most state-of-the-art Bridge Management Systems (BMSs) to predict future bridge condition ratings. As confirmed by many researchers, the reliability of the probabilistic deterioration models rely heavily on the sufficient amount of condition data together with their well-distributed historical deterioration patterns over time. However, inspection records are usually insufficient in most bridge agencies. As a result, a typical standalone probabilistic model (e.g. state-based or time-based model) is not promising for forecasting a reliable bridge long-term performance. To minimise the shortcomings of lacking condition data, an integrated method using a combination of state- and time-based techniques has recently been developed and has demonstrated an improved performance as compared to the standalone techniques. However, certain shortcomings still remain in the integrated method which necessities further improvement. In this study, the core component of the state-based modeling is replaced by an Elman Neural Networks (ENN). The integrated method incorporated with ENN is more effective in predicting long-term bridge performance as compared to the typical deterioration modeling techniques. As part of comprehensive case studies, this paper presents the deterioration prediction of 52 bridge elements with material types of Steel (S), Timber (T) and Other (O). These elements are selected from 94 bridges (totaling 4,115 inspection records). The enhanced reliability of the proposed integrated method incorporating ENN is confirmed.

Abstract: In order to obtain the interaction behavior between the track and the bridge, the various design codes adopted generally the recommendations of the UIC leaflet. The maximum longitudinal stress (force) in the rail can be calculated by the linear combination of the results obtained by the separate analysis of three elementary important loads. This conventional method completely neglects the influence of the loading history, and may have some error because of the behavior of the longitudinal resistance connecting the rail and the bridge-deck is under the highly nonlinear. In this study, the algorithm for the modified method considering the sequential nonlinear loading combination and the effect of the loading history is proposed. The results from the application of the modified method are compared with the results obtained from the conventional method.

Abstract: Based on response spectrum method, the seismic behavior of a long span cable-stayed bridge is investigated through three dimensional finite element model established by ANSYS. By calculating the cumulative effective mass factors of the bridge, the minimum number of modes used for modal superposition analysis is obtained. Design acceleration response spectrums under two probabilities are used in the analysis. The response spectrums are input in the bridge longitudinal direction, vertical direction, transverse direction and combined horizontal and vertical directions. Displacements and internal forces results show that vertical component of the ground motion greatly influences the response of the bridge and there is significant difference between the results of the two probabilities.

Abstract: According to the basic principles and methods of the fuzzy reliability assessment to the existing bridge, RC rigid-frame arch bridge with Fuzzy reliability evaluation of a judgment factor sets of class I and class Ⅱare identified in this paper, aiming at the existing disease in this kind of bridge. Then, the fuzzy reliability comprehensive evaluation model of RC rigid-frame arch bridge is established. Meantime, the paper raises the membership function of each evaluation index; uses Analytic hierarchy process (AHP) to determine the weight vector of each factor. At last, a reliable practical analytical method for the evaluation of the existing RC rigid-frame arch bridge’s bearing capacity is obtained.