Applied Mechanics and Materials Vol. 724

Abstract: The steeply dipping seam group is defined by the two or more coal seams ,a pitch between 35°~55°. Using masonry beam theory, longitudinal bending theory and “R-S-F” dynamics control theory built a lower area overburden structure mode. Analysed the stability of low position coal seam. The balance requirement and the strength of the structure which is affected by the caving rock and lower coal roof were given. It easily generates two lower position steps rock structure in inclination along working face. Regular breaking of the second structure is the main reason leads to the imbalance of the structure between upper coal pillar and upper coal mining face.The interaction among multiple coal seam panels and overburden structures is the main reason that causes the rock disaster, the unbalance of the lower area may lead to pushing accident, the imbalance of the upper area can generate shock pressure.

Abstract: Recently, the steel piles have been applied for the all engineering field. But the deformation law of the steel sheet piles has the lack of research. So with the help of one project, the article analyses the monitoring data. And compared with the numerical simulation, the research on the deformation law and influence factors of the steel sheet piles are carried on. It lay the good foundation of the experiment.

Abstract: The stability of the concrete shear wall is composed of the overall stability and wall limb local stability, the overall stability and local stability calculation formula can be used the same form of expression. Based on the theory of stability calculation of elastic thin plate, the trilateral bearing and quadrilateral bearing wall limb length factor is derived. And then, it pointes out the disadvantages of the current code and design software, and gives the corresponding solution.

Abstract: PC box-girder bridge with corrugated webs is a new kind of bridge, which named by the thin steel webs replacing thick concrete webs. It is applied abroad in China recently, which attracts attention for its shearing property. Because of lacking relative design and construction code interiorly, the related data of Mi-Luo-Jiang bridge was used in the study with the software ANSYS 10.0. The shearing property and bucking stability of Mi-Luo-Jiang bridge were studied and a theory was verified: corrugated webs do not bear moment and axial force. Besides, the result that the decisive parameter of shearing property of Mi-Luo-Jiang bridge should be allowable shear stress is obtained. The other study had been done on buckling stability of box-girder bridge with different corrugated shapes, maintaining other parameters invariant. Finally, the optimal scope of lateral plane length is [0.2,0.4], and the optimal scope of folded angle is [20º,50º]. The parameters used in Mi-Luo-Jiang bridge is verified as the best value. This study is meaningful and the results can be applied in the design and construction of the same type bridge.

Abstract: This paper aims to make a comparative study between the static and the dynamic analysis in the cardanic transmission. The cardanic transmission is done at full scale and is charged as it is in practice, by means of the Solidworks and Cosmos programs. We observe the differences and the tension areas which appear in the cardanic transmission elements and present the findings and the given solutions, according to the study.

Abstract: This paper presents a kind of optimum modeling method for evaluating system buckling load of plane sway frames, based on the research of the different correction coefficient β. The buckling load of plane sway frames was calculated by using the optimized method, and the results were compared with those of the ANSYS. It is verified that the simplicity, accuracy and applicability of the method.

Abstract: Improving the crashworthiness of ship is an important guarantee for ship security. To fill different materials in the shipboard structure or attach fender devices outside the shipboard are important measures that can improve the crashworthiness of ship. They are boiled down to the use of crashworthiness materials, and the impact of crashworthiness materials on the double side ship is classified as the changes of shipboard structure elastic modulus, and then this paper carries out an analysis of the impact of the changes of various parts’ elastic modulus of the shipboard structure on the crashworthiness of ship, and the computing result shows that to lay crashworthiness materials on the sheet metal can improve the structure crashworthiness before the rupture occurs, some useful conclusions about the material impact on the crashworthiness of ship are obtained.

Abstract: In order to intensively study the stability influencing factors of rockfill dam slope in tailing pond, it was simplified to the common rock slope. And the data of 45 groups of circular failure slope was collected, based on the discrete normalization, the condition attributes of influencing stability were reduced by Rough Set theory (RS), at the same time, the stability influencing factors were simplified by Principal Component Analysis (PCA). Combining the two results through the above two methods, the main affecting factors of the rockfill dam slope’s stability are: rock density, slope angle and the angle of internal friction. The study conclusion can provide the decision-making basis for the rockfill dam design and safety management, and also be used as the foundation for other intelligent algorithm to predict the dam safety coefficient.

Abstract: The damping mechanism of buckling restrained braces is clear, the effect is significant, safe, reliable and economical, it can be used in structures that have different seismic requirements and seismic intensity. It can be used for single-storey buildings, high-rise buildings. It has not only been applied to new buildings, but also have been used for seismic reinforcement and shock repair of the built construction, so it has broad application prospects.

Abstract: Taking the surrounding rock of deep-buried at the Jinping II Hydropower Station as the engineering background,the research of similar material and dosage in blasting model test are carried out,based on the scaling method of Froude,the specific parameters of the model materials is determined;through indoor test,different ratio of model material standard specimen was carried out by mechanical test,the mix of similar material is got to simulated the actual rock;base on the theory of explosive stress wave,the research of the similar quantity is carried out.The results shows:froude can be applied to the theoretical calculation of the similar material in the experiments;the acoustic velocity and the strength of the model materials decreased with the increase of water paste ratio;using gypsum,water,sodium phosphate polymer(1-0.62:0.55%) applied to deep marble similar material in laboratory model test;corresponds to the actual blasting engineering 500 kg, 800 kg of similar explosive dosage for 60 grams, 90 grams.