Advanced Materials Research Vols. 1079-1080

Abstract: A new kind of Metal Rubber material vibration isolating bearing is developed and the MR bearings with three different height-width ratio are manufactured. The dynamic shear hysteresis properties of the MR bearings are tested. The theoretical dynamic model method is adopted for the comparative analysis. The experimental results shows that with the H-W ratio decrease, the effective shear stiffness and the effective damping capacity of MR vibration isolating bearing will increase, and the total energy dissipation increases greatly. The selection of the H-W ratio of the MR vibration isolating bearing become an important issue in the structural seismic isolation design.

Abstract: With economic development, China’s railway construction is also rapidly developing and its technical requirements are also increasing. In recent years, CWR technology is most used in railway construction, the railway built using this technology is not only smooth, comfortable, but also long life and low maintenance costs, being widely used in railway construction. However, due to restrictions on the production technology and construction conditions, CWR will also be worn, broken, bent, etc., which requires people to continue to study techniques to prevent crawling or off the seam value of rail gauge, to ensure that rail transport safety. This article focuses on the finite element method-based bridge vertical plate non-ballasted track CWR mechanical properties.

Abstract: In this paper authors have considered existing mathematical modeling methods of filtration mode of large dam’s foundations using finite element method. Practical analogies for solving filtration equation have been described concerning the problems of hydraulic engineering. Recommendations for solution to filtration problems have been given based on use of general-purpose industrial CAE software.

Abstract: The effects of atmospheric pressure changes on the air entraining capability of air-entraining admixtures was studied using a low-pressure test chamber to simulate plateau environments with thin air and low atmospheric pressure. Results indicate that the atmospheric pressure of the environment significantly affects the performance of air-entraining admixtures. The air content of fresh concrete decreases by approximately 20%–49% when the atmospheric pressure is 50 KPa with respect to the normal atmospheric pressure (101 KPa). The air content of fresh concrete decrease linearly as atmospheric pressure dropped. The higher the air content of fresh concrete mixed in ordinary pressure, the faster the air content of fresh concrete decreases with the drop of air pressure. The concrete with high slump shows more resistance to drop of air-content due to low air pressure than the concrete with low slump. Therefore, in order to meet the design requirements of air content of air-entrained concrete for different constructions in the plateau regions, it is necessary to increase the dosages of air entraining agents to according to different pressure conditions and types of air-entraining agent.

Abstract: Inthis paper, according to the more important ten evaluation indicators, the fourgrades ideal evaluation is established corresponding to the level of healthstate of bridges. Combined with associative memory capacity of discreteHopfield neural networks, a new health state evaluation of bridges ispresented. Five bridges is evaluated by the model, the network connectionweights is obtained by iterative learning using the outer product method. Thesimulation results shows that the health evaluation model can evaluate thehealth state of bridges fast, accurately and intuitively.

Abstract: Most of ancient pagodas were damaged by earthquakes, and the dynamic behavior is a key factor to determine the seismic strengthening scheme of the pagodas. This research selected a typical masonry pagoda as the object, combined free vibration test with numerical simulation to discuss the influence of dimension change of ground base on dynamic behavior of the pagoda, as well as the construction method of the FEA model based on the soil-structure interaction. The dynamic behavior tested from a 1:15 reduced scale of physical model indicated: comparing with the condition of pagoda pedestal is fixed, the natural frequency of the superstructure is decreasing with the increase of thickness of ground base，which shows the “soft effect” of ground soil to structural stiffness. The influence degree of thickness and plan size of ground base to dynamic behavior of the physical model are simulated by program ANSYS, and the effective dimension range of ground base for the FE analysis of pagodas has been proposed.

Abstract: The torsional capacity oftwo recycled aggregate concrete (RAC) beams with 100% recycled coarse aggregate(RCA) and two normal concrete beams subjected to monotonic torsion was investigatedby the finite element software ABAQUS, and the simulated results were comparedwith the experimental results. The investigation shows that recycled aggregateconcrete torsional members have good seismic behavior. The simulated resultsagree well with experimental ones. It can be reference for actual engineering.

Abstract: Theexperimental research on the double-track railway Lanzhou-Wuwei Railway (a partof Lanzhou-Xinjiang Railway) subgrade loess fills improved with lime revealsthe stiffness mechanism as well as the connection between stress and strainafter the lime treatment of loess. It also analyzes the influential propensityseveral factors have to the lime-improved-loess stiffness and comes up withinfluential patterns these factors have to the stiffness. The experimental resultplays an instructive role in the application of lime-improved-loess in sitespecific projects.

Abstract: Because of local conditionsof Hexi Corridor, people explore the local environmental characteristics, andexploit adobe dwellings as asymbol of living forms. The Hexi region's natural climate factors mark Hexibuilding with a deep imprint in Ming and Qing Dynasties.

Abstract: Theregulations of the land access for mineral exploration in China are so inattentive thathindered the realization of the interests of the holder of mineral explorationright. Using the provisions of the land access of mineral exploration andcompensation system in Western Australia, Queensland, New South Wales for reference. In order to realize theright of the holder of mineral exploration right, the compensation systemsshould clear the landlord , enlarge the scope of the compensation.