Advanced Materials Research Vols. 168-170

Abstract: Nonlinear analysis of the steady-state load-bearing capacity of steel tubular and the steady-state load-bearing capacity of scaffold was simulated by ANSYS considering semi-rigid connection and pole in different flat. Quantitative standard of the steady-state load-bearing capacity to the steel tubular and the steel tubular scaffold with couplers is used in ANSYS. The effect of semi-rigid connection on the overall steady-state load-bearing capacity of the steel tubular scaffold with couplers is great. The effect of pole in different flat on the overall steady-state load-bearing capacity of the steel tubular scaffold with couplers is smaller. It’s generally recognized that nodes of vertical bars and horizontal bars of steel tubular scaffold by fasteners is not rigid, but semi-rigid; is not in the same plane, but in a different surface. This structural model directly affects the steady-state load-bearing capacity of scaffold. In this paper, ANSYS software was used for nonlinear analysis of steel tubular scaffold, the same models with experimental value [4] was used to establish standards for determining the instability load [1] [2], to determine the effect of bar coplanar and semi-rigid connections on steel tubular scaffolding overall stability capacity.

Abstract: Considering the interaction between fiber-inclusion and strong constraining interphase, forth-phase model is suggested to determine the local stress field distribution of three-phase element in eutectic ceramic rod. On the basis of the volumetric average strain, the effective compliance tensor increment of eutectic ceramic rod is obtained. The remote stress boundary condition of the eutectic ceramic rod is accounted for getting the micro stress field of fibers in eutectic ceramic rod. The results show the micro stress field of the fiber-inclusion in eutectic ceramic rod is associated with the stiffness and the volume fractions of each component in eutectic ceramic rod, the shape of interphase and fiber. The micro stress field has apparent size effect: three direction stresses increase with the diameter of fiber- inclusion.

Abstract: Work conditions and requirements of a container stacker are analyzed. Aiming at the disadvantages of hydrodynamic travel system of stacker, a design method for hydraulic chassis of a stacker is presented. With a practical example, its operation performances under the work conditions of stable travel in low-speed are analyzed. New method to design its travel drive system is presented, it contains the hydraulic system design and component selection. It is considered that the manufacture cost for special hydraulic chassis of a stacker is equal to or lower than that of a hydrodynamics chassis, so there is wide application prospect of it.

Abstract: The engineering investigation was researched for offshore wind farm. On several occasions the soil conditions had proven to be a key area for offshore wind farm. The offshore engineering investigations, usually based on survey, test, simulation and analysis methods, were established information about seabed topography, seafloor soil, and offshore environment. The principle and procedures of engineering investigation were studied, offshore site conditions were analyzed for meteorological conditions, oceanographic conditions, soil conditions, seismic activity, biology, and various human activities, and engineering investigations were researched to various foundation types, and time schedule for offshore engineering investigations was established. Experience of engineering investigations was put forward to combine with foreign offshore wind farm. The engineering investigations provide project basis of various structure on offshore wind farm.

Abstract: Taken Hongwei test field in the He Tao irrigation area of Inner Mongolia for research example, soil water and salt movement model system in regional unsaturated zone is established and tested, through the method of regional zoning. Detection results indicate that the calculated results from the model system agree well with the measured data. It is concluded that simulating and forecasting soil water and salt movement in regional unsaturated zone with this model system is feasible and authentic.

Abstract: Power line communication is popular at indoor communication and smart home applications, which face a harsh using condition that is of bad impedance match, large signal attenuation, unexpectable noise and channel high time variation. These difficulties set a high threshold for power line communication technology and improve the communication channel simulation to an important place. To predetermine the performance of power line communication productions, a narrow-band communication simulation platform was developed. This platform is based on low voltage communication channel model, and can update the system parameters using on site measured data, which could get a match with the real application environment. Main channel characteristics, such as noise, signal attenuation and frequency respond could be simulated on this platform. Noise generation frequency range of this platform is 0~120MHz, attenuation frequency range is 0~4GHz and attenuation range is 0~120dB. All performance indexes can well cover the measurement boundary of power line communication.

Abstract: By analyzing and simplifying the force status about the concave water surface and wall of concrete capillary pores,the model for force calculation of capillary walls is established.When the concave water surface is going down,capillary walls will contract. Concrete volume shrinkage strain at different surface tension is approximately calculated out by using finite element software ANSYS,from which the relationship between the surface tension of capillary water and drying shrinkage,early self-shrinkage of concrete is obtained.

Abstract: In order to discuss on highly weathered metamorphic fillers as soft stone fillers，firstly the CBR tests for analysis on viability as embankment filler are conducted on three different highly weathered metamorphic fillers. Secondly the rock strength tests and particle broken tests are processed to study on how weathered degree and rock structure have an effect on them. Based on the above conclusions, evaluation criteria are proposed that have certain guidance and reference on mountainous highway construction.

Abstract: Existing numerical simulation methods tend to neglect some details of shield tunnelling and the cyclic shear characteristics of pile-soil interface. In this paper, an elaborate simulation method is firstly proposed to simulate the advancing of shield machines according to the details of shield tunnelling. Then an improved constitutive model for pile-soil interface, which can factually consider the cyclic shear characteristics, is also developed. Finally, through a case study, it can be found that the proposed simulation method can provide reliable estimation for this problem, and it is important to factually consider the cyclic shear characteristics of pile-soil interface.

Abstract: EPS(Expanded polystyrene)is used as light-weight.By adding fly ash and modified polymers in proper proportion aggregate, and cement is used as adhesive material, the uniformity and stability of pastes can be improved. The EPS light-weight concrete is obtained with good physical mechanical perform ance and some problems of segregated layers, weak interfacial bonding, and low density and strength etc, can be solved. The effects of water cement ratio and fly ash proportion on the mobitity of the mixture and the strength of the concrete are analyzed.