Applied Mechanics and Materials Vols. 204-208

Abstract: Aiming at a practical engineering case of a subway station, the paper uses the common software ANSYS as its analysis tool and uses the load structure method to do simulation analysis on the station's main structure. The results indicate that this method is practicable and has certain reference value for engineering design.

Abstract: The technology of Concrete beams and slab reinforcement is one of the key technologies of reinforcing and reusing existing buildings. There are many ways of reinforcement on the components and there are also some relevant state regulations. Take the carbon fiber sheet reinforcement technology as an example. It is mainly used to improve the bearing capacity of concrete, but plays limited role in improving the stiffness of concrete. When the changes in the load of industrial buildings are relatively large, it is difficult for this approach to achieve the purpose of reinforcement. While using section steel reinforced concrete slab can not only improve the bearing capacity of beams and plates, but also significantly increase the stiffness of beams and slab. The paper by introducing different methods of section steel reinforced concrete beam, beam end bearing and slab, the essay shows the improvement that a variety of reinforcement methods have made on bearing capacity and stiffness, and points out the precautions during the construction, which provides a reference for engineering applications.

Abstract: Abstract: The elastic modulus values of masonry were studied by using homogenization with microscopic mechanics. The formulate of the elastic modulus of brick masonry were derived from the formulae of the elastic modulus and Poisson’s ratio of brick and mortar. The calculated results according to the methods agreed better with our current national codes and the frequently-used formulas. This has paved the way for the study of the failure mechanism of masonry ,and make the analysis of masonry structure more accurate more and convenient.

Abstract: In order to study the shear behavior of sand-concrete structure interface, shear stress and relative displacement curves were obtained through a series of direct shear tests, in the procedure of which the roughness of interfaces was quantified into 3 grades and the stress history can be achieved by loading the sand to an initial normal stress and then unloading to a normal stress to shear. Through analyzing the curves, several conclusions can be obtained as follows: Shear stress increases with the initial normal stress and roughness at the same tangential displacement. The initial shear modulus can be improved in case of the increase of initial normal stress and roughness. The friction coefficient can be obtained by fitting the curve of the maximum shear stress and normal stress corresponded to Mohr-Coulomb Criterion linearly. The friction coefficient of sand-concrete interface increases with roughness as well as its increase range.

Abstract: This paper describes design strength of concrete-filled tubular (CFT) section columns accounting for local buckling of steel skin. The local buckling has a negative effect on the ultimate compression strength based on the yield stress of steel skin and nominal compressive strength of in-filled concrete. A squash load formula for CFT stub columns is proposed to account for the post-local-buckling strength of steel skin. A compressive strength formula for filled-in concrete accounting for the confining effect of steel skin and strength ratio between filled-in concrete and steel skin is also proposed. The squash loads predicted by the proposed strength formula for the direct strength method were compared with the AISC (2010) and Eurocode4 (2004). The comparison showed that the squash load formula proposed can predict conservatively the squash load of circular and rectangular CFT columns with local buckling

Abstract: The reflection and transmission coefficient equations in multilayer bonded structures have been achieved by improved global matrix algorithm. The change of bonded strength have been simulated by the change of shear velocity in bonded layer.The curve between reflection coefficient and angle of incidence in immersion and plane ultrasonic longitudinal wave have been calculated in different bonding strength and the same frequency. The emulational graph had been compared and analyzed. The quantitative test of bonding strength and orientation of poor bonded district have been implemented. The conclusion can provide theoretic guidance for experimental research of bonded strength.

Abstract: In order to make good use of bamboo resources in China and to promote the establishment and promotion of green structure system, which is light and energy saving, this paper presents two kinds of structure form: the composite walls bearing box structure system and the composite beam-column bearing frame structure system. Meanwhile, the design methods of connection and installation of steel-bamboo composite structure system are introduced.

Abstract: With the wide application of high-strength concrete and thin-wall steel tube in concrete-filled steel tube, it is essential to study the post-local buckling behavior of rectangle steel plates. Based on large deflection theory of plate, the post-local buckling behavior of steel plates in concrete-filled steel tube is analyzed in this paper. At the same time, the post-local stress of steel plates is obtained. The results indicate that the post-local buckling behavior of steel plates can be effectively utilized in large width-to-thickness ratios of steel plates.

Abstract: Based on the engineering case of a steel silo used for storage cement, the circumferential stress and axial stress of steel silo wall was carried out by ANSYS, when environment temperature falls. Result shows that the impact of environment temperature reduction on the silo wall circumferential stress is significant while the impact on axial stress is small. Circumferential stress increase about 21MPa and axial stress increase 4.1MPa when the environment temperature falls 10°C.The impact of temperature reduction should be taking into account in the design of steel silos in cold area.

Abstract: The dual-track tracking CSP system is an amelioration of the traditional photo-thermal power system. One advantage of this system is that the heliostat, with its movable support and slip frame, can be powered to instantly keep track with the sun, thus promoting the efficacy of the generator. The supporting structure of the heliostats has an enormous bulk, and being removable, it encompasses many links to pass the complicated force. Furthermore, the cooperation of various parts of the system, such as the structure, control system, opticator, and mechanical parts, must be taken into consideration in the design process. Therefore technical feasibility becomes the premise for the realization of the system, and its production cost determines the scale of its practical application. Based on the working principle of the dual-track tracking CSP system, this paper makes an analysis of the features of the supporting system of the heliostat, clarifies some key points in the design and optimization of the supporting structure, and puts forward some advice on the solution of the problems.