Applied Mechanics and Materials Vols. 351-352

Abstract: Sheet pile with relieving platform is new type of retaining structure which has been successfully used for reinforcing slopes in Shenzhen city, China. The stress and deformation of sheet pile with relieving platform are very complex owing to the existence of relieving platform. In this paper, the authors divide the sheet pile with relieving platform into loaded segment and anchored segment and developed a numerical model to calculate the inner force and deformation of the sheet pile with relieving platform. Finally, the authors use FEM model and fielding monitoring data to investigate the effectiveness of the newly developed calculation model.

Abstract: Based on the finite element software ANSYS, deep beams in short-leg shear walls structures is analyzed in this paper. Seven models which include 1 straight wall, 3 L-shape and 3 T-shape walls are established to simulate the mechanical properties of L-shape, T-shape and straight shape short-leg shear walls structures under horizontally cyclic loading. The distribution regulations of damage and stress are given out.

Abstract: By using of a micro mechanical fatigue testing system, low tension-tension cycle fatigue properties of 301 stainless steel thin sheets with a thickness of 0.1 mm were studied. The effects of loading frequency and stress ratio were considered in the tests. The results show the S-N curves descend continuously in the low cycle regime. Cyclic σ-N curve was obtained according to the traditional fatigue theory. It agrees well with the experimental data, showing that the traditional fatigue research methods are also suitable to describe thin sheets in a certain extent. With the increase of loading stress ratio, the fatigue strength of thin sheets is increased. There is an evident effect of frequency on the fatigue behavior of the thin sheets.

Abstract: In order to reveal the vibration characteristics of the inflatable tubes of ETFE foils, the modal analysis was carried out for a 2.3m long inflatable tube of ETFE Foils. The equilibrium shape of the inflatable tubes was obtained from the static calculation with geometric nonlinearity. Modes of the inflatable tubes were achieved by the Lanczos method. The effect of boundary conditions, the inflatable pressure, the elastic modulus and air added mass on the vibration characteristics was analyzed. Analysis shows that the elastic modulus and air added mass have significant effect on the natural frequencies of the cantilever inflatable tubes. First frequency of the inflatable cantilever tube is less than the inflatable tube without constrains. Inner pressure has a slight effect on deformation modes with beam bending characteristics. The numerical method based on ABAQUS finite element analysis is reliable according to a comparison between test and simulation results.

Abstract: The effects of deformation modulus, thickness and range of cushion layer on mechanical characteristics of spiral case in hydropower station has been analyzed using the finite element program ANSYS and nonlinear contact theory. The result shows that when cushion layer scope and poisson ratio is fixed, as the elastic modulus of cushion layer decreases, the deformation and stress of spiral case increases, surrounding concrete load-bearing ratio of water pressure reduces. If the cushion layer deformation modulus is fixed and the range of cushion layer extends to 10 degree site bellow the waist of spiral case, the steel spiral case stress decrease, the radial stress transferred from the spiral case to surrounding concrete increase by about from 0.01MPa to 0.03MPa, and load-bearing ratio of concrete increase, when the cushion layer Poisson ratio increases from 0.25 to 0.35.

Abstract: Nonlinear numerical analysis for the stress performance of frame Side Joint is processed in this paper with the finite element software of ABAQUS. Compared with experimental results, numerical analysis results are found to be reasonable. Then the influence of factors such as reinforcement ratios, stirrup ratio and axial compression ratio are contrastively analyzed. The results show that reinforcement ratios have a greater influence on the bearing capacity and hysteretic performance of the structure, but the stirrup ratio and the axial compression ratio have less influence.

Abstract: The magnitude of sliding pipes drawn force has important effect to quality and schedule of construction. Using concrete creep model of time dependent strength and dynamic contact algorithm, studying on the Tibet Pangduo hydro-junctions construction about ultradeep diaphragm wall with height of 150 metre, drawn force under different drawn time and hole deviation are numerically simulated, and are verified by field test. The results show that the magnitude of drawn force is affected by many factors, mainly related with contact characteristics and hole deviation between sliding pipe and concrete; with the increment of drawn time carrying forward and hole deviation, drawn force apparently increases; without hole deviation, the drawn force is about 500t after pouring to 40m.

Abstract: In order to confirm the calculation model of multi-ribbed slab structure and transmission of earthquake action, this paper improved existing multi-ribbed slab structure. The calculation model of improved multi-ribbed slab structure confirmed the stress relationship among three seismic fortification lines, and the transmission of earthquake action became clear, the same calculation model could be applied in structural analysis. For studying the effect of characteristic parameters of restoring force changing in the second seismic fortification line on seismic performance, and correcting the parameters, this paper analyze push-over model of the second seismic fortification line to get the static pushover curve. According to the study, the amount of steel bar in grid column and sectional dimensions of grid beam made the major effect on characteristic parameters of restoring force in the second seismic fortification line. The growth of steel bar’s sectional area in grid framework and the yield strength are mainly in direct proportion. It is more reasonable that simultaneously alter steel bar’s sectional area in grid frame and dimensions of grid framework to adjust characteristic parameters of restoring force changing in the second seismic fortification line.

Abstract: Based on a ultra-deep diaphragm wall of Pangduo hydropower station, time of pipe drawn and drawn force under different times and hole deviation was researched. Field test was used to verify analysis conclusion. The results show that drawn time is 7~8 hours after concrete pouring, that is 40m high concrete after pouring. Several factors has effect on drawn force which relates to contact characters between sliding pipe and concrete and hole deviation.

Abstract: According to the research, a new arrangement method of prestressed concrete slab is provided. It has not been mentioned before and this article discussed unbonded prestressed concrete slab system, and gives the theoretical calculation method.