Applied Mechanics and Materials Vols. 99-100

Abstract: Safety inventory quantity computation based on Collaborative Planning Forecasting & Replenishment (CPFR) can avoid uncertainty of material supply in building construction, which can also coordinate relationship between supplier and construction side to reduce inventory cost and to ensure the progress of construction. The paper analyzed systematically on relationship between lead time and safety inventory. Combining with application of CPFR and based on establishing good relation between material supplier and construction contractors, safety inventory level was reduced with management of lead time. Supply of material supplier was also coordinated to reduce uncertainty of inventory quantity. Construction application example based on improved safety inventory quantity method also proves the feasibility of the proposed method.

Abstract: he failure phenomenon of coupling and universal-joint trunnion had often taken place since they were put in production. The static load strength and fatigue strength of main components were tested and analyzed in the ANSYS software. In order to deal with this failure problem, dynamics and kinematics emulation of drive system without damper was made to find the reason for his failure problem. An improvement program for the drive shafts was put forward. This paper provides theoretical basis for the design and production of tracked vehicles’ drive shafts.

Abstract: Based on the analysis of various kinds of terrain data used in applications of three-dimensional terrain visualization, this paper puts forward a preprocessing method named hierarchical blocked processing for massive terrain data, and obtains relevant mathematical models and algorithm requirements.

Abstract: With the development of domestic highway, people put forward higher and higher requirements for traffic capacity and service quality of the highway. This paper starts with traffic incident information management system functions, researches and develops a traffic incident information management system application platform based on the analysis of geographic information system software application. The feasibility of the system is proved with the valuable practical application and the program is implemented.

Abstract: Abstract. Lateral pedestrian loads and flexible footbridge form a dynamic interaction system, which has a special lock-in phenomenon and results the instability of the dynamic system when the pedestrian number reaches certain critical value. A simplified theoretical equation to model the dynamic interaction system and to estimate critical pedestrian number is proposed. The lateral pedestrian loads resulted by structural vibration is first analyzed from a view point of social force model. And then, combined with structural vibration equation, the control differential equation for describing the dynamic interaction system is proposed. The control equation explains why the lock-in phenomenon is resulted and how to estimate the critical pedestrian number. Two typical footbridges are investigated and the results show that critical pedestrian number estimated by the model is more close to those by field observation.

Abstract: Wenchuan earthquake of May 12 struck China with amazement in 2008, which inflicted the devastating destruction to the public transport infrastructures in Sichuan province. Generally speaking, underground structures have the stronger seismic resistance performance compared to ground-level structures. However, seismic disasters of mountain tunnels were fairly conspicuous after the earthquake. Based on the references about tunnel earthquake damages at home and abroad (Dowding and Rozen, 1978; Huo, 2005; Rozen, 1976; Youssef, 2001; wang, 2001), more attentions should be paid to the prevention and mitigation of tunnel seismic hazards under severe intensity earthquakes. This paper describes some typical earthquake damages to mountain tunnels during Wenchuan earthquake and presents the basic characteristics of the tunnel seismic damage as well. Meanwhile, the possible reasons for the seismic damage and the corresponding measures for relieving or resisting the damage are also given.

Abstract: Soil liquefaction is extremely detrimental to the Central Henan transit railway line project. The present study proposes a preliminary design to evaluate the effects of liquefaction and to determine the parameters and protective measures that need to be implemented. The geological properties, clay content, groundwater level, and the thickness of the overlying non-liquefied soil were initially determined. Then, a standard penetration test was employed to analyse the soil liquefaction potential in an iron mine in the Central Henan rail transport project. The evaluation of similar engineering project sites with middle-class areas vulnerable to liquefaction is important to determine the necessary anti-liquefaction measures.

Abstract: Life prediction is one important of area Engine research. Take-off EGTM is an important parameter to monitor Engine performance. Take-off EGTM have great influence on Engine life, Reducing EGT will help to extend Engine life on wing (LOW), thereby reducing operating costs. Aiming at aero-Engine condition monitoring, the definition of take-off EGT Margin is given, estimation methods and their application on Engine life prediction are discussed.

Abstract: At present, there exist many simple and reliable methods to describe the damage degree of reinforced concrete structure induced by low velocity impact. However, the actual fracture process can not be well reflected by the current methods. Therefore, a piece part model, which can well describe the damage process, was put forward. The cracks generated in the concrete beam can be reflected by the interfaces between the elements. In this method, the beam is descretized as the linking system of the steel bar and concrete. The dynamic calculating equation of the beam is deduced on the basis of the internal force and inertia force of the rigid unit and linking piece. The local deformation in the contact region of the beam and the stress-strain state of the beam under low velocity impact can also be calculated by this method. Finally, the advantages of the model were proved by a practice example.

Abstract: Failure mechanism and fire resistance comparison of concrete-filled steel tube (CFST) frames, reinforced concrete (RC) frames and steel reinforced concrete (SRC) fames are proposed in this paper when their bearing capacity and rigidity at room temperature are similar. The result shows that the failure mode and failure mechanism of the 3 frame structures are much different, and the SRC frames have the maximum fire resistance.