Applied Mechanics and Materials Vols. 368-370

Abstract: In order to realize long-distance, long-term and on-line cable tension monitoring of suspension bridges, a novel sensor has been designed based on Fiber Bragg Grating (FBG) sensing technique, which comprises of fixtures of the sensor as well as FBG, micro-spring and epoxy resin made large gauge sensing element. Further, following the calibration test for the designed FBG sensor, research on the calibrated sensor for monitoring the cable tension was carried out, whose result shows that, featured by the simplicity of operation and the accurate monitoring data, the designed FBG sensor is capable of monitoring the cable tension of built suspension bridges.

Abstract: This paper evaluated module performance deterioration based on module performance baselines, and established a case-based aero-engine module maintenance level decision model. Then corrected the module maintenance level based on the limits of LLP, AD/SB, hardware damages, soft time to develop a reasonable maintenance level.

Abstract: This article reviews the concept of seismic time-history analysis, the research status of the truss bridge structure in the case of seismic wave. Finally, the some new measures and methods of enhancing anti-seismic design for the truss bridge structure are also proposed.

Abstract: By utilizing finite element software MIDAS-GTS, layer structure model is established and the force situation of large section tunnel under the combination of three sets of surrounding rock and three sets of flat ratio is analyzed. Through comparing axial force of anchor, axial force and bending moment of shotcrete and displacement of the lining, the optimal flat ratio is selected. Results can provide reference for the design of the large section highway tunnel.

Abstract: Because of the complexity of the ductility of reinforced concrete bridge columns test operation, the paper compiles VB application procedure to study the anti-earthquake ductility of reinforced concrete bridge columns.The experimental data in the test of concrete bridge piers and the caculation value of VB are compared, which agree very well. Therefore,feasibility of VB procedure to analysis the ductility of bridge columns is proved.

Abstract: With the development of economy and the rising of public awareness on environmental issues, building energy consumption, especially the energy consumption of public buildings represented by large space stadiums, has received an increasing public attention. Geothermal energy, as a green energy, is widely used in large public buildings as a replacement of traditional energies. This article compares the respective economic and environmental benefits of ground source heat pump system and traditional air-conditioning system. First of all, the article discusses the feasibility of building geothermal wells and utilizing geothermal energy in large space stadiums. Then, the article illustrates the determination of the parameters of the geothermal wells and geothermal utilization strategy (deep + shallow geothermal) through software stimulation on Dest. Finally, the article evaluates the environmental and economic effect of geothermal energy system applied in large space stadium.

Abstract: t is significant to study settlement characteristics of the base layer in immersed tube tunnel for the settlement is quite large during the construction. Collects trial data of five sand replacement model based on engineering of Guangzhou zhujiang immersed tube tunnel, Guangzhou biological island-University city immersed tube tunnel, Guangzhou Zhoutouzui variable cross-section immersed tube tunnel, Tianjin Haihe immersed tube tunnel and Zhoushan shenjiamen immersed tube tunnel. Analyzes current study of the sand replacement model test and settlement characteristics, and summarizes current development and research progress. Analyzing the mechanism of settlement and silting impact in the base layer anti to the lack of settlement characteristic study and puts the further study and research ideas forward.

Abstract: In this paper, by establishing the finite element model to study the dynamic characteristics of rigid frame single-rib arch bridge. By respectively changing structural parameters of the span ratios, and the compressive stiffness of arch, and the bending stiffness of arch, and the bending stiffness of bridge girder, and the layout of boom to find out the regularity of the structure on lateral stiffness, and vertical stiffness, and torsional stiffness as well as dynamic properties, it come out the results of that lateral stiffness of the structure is weaker, and increasing the span ratios and the compressive strength of arch are conducive to the improvement of the overall stiffness, and improving the bending strength of arch and layout of boom are less effect on the overall stiffness and mode shape.

Abstract: The interaction of track structure and high-speed train has greater impact on safe and steady running of the trains. This paper obtained acceleration and frequency spectrum of the train's running vibration in the case of sleeper’s spacing and continuous failure， and continuous and spacing loose tie by establishing the vertical model of vehicle-track coupling system, and analyzed the sleeper failure and loose tie which has a greater impact on the 40-80 Hz vibration frequency of the train, which provided a basis for track maintenance.

Abstract: Based on analysis of problems existing in the design process of integrated pip network, the authors put forward the aided design method of converting 2D design drawings to 3D visualization model. Based on the 3D aided design workflow, the solution of 3D aided design is proposed, the kernel contains include: making drawing standard and development of the plug-in, selection and secondary development of 3D platform, report of conflict analysis and optimization design. The key analysis technique is discussed in the end of this paper.