Applied Mechanics and Materials Vols. 578-579

Abstract: Against the current problem of large errors in the test result of short cable force, this paper, based on energy method principle, introduces the concept of simply-supported modal participation factor. On the premise of considering the impact of such factors as flexural rigidity and boundary conditions, etc. on cable force test, this paper corrects the existing prediction models for short cable force, to provide a computational formula based on compound boundary conditions for the short cable force. Field measured data is combined to compare the prediction accuracy of the existing formulas, to draw a conclusion that the error of short cable force is almost always greater than 5% when calculation is based on simple-supported boundary conditions, and the error of short cable force is always greater than 10% when calculation is based on consolidation boundary conditions, while the error of short cable force is always less than 5% when calculation is based on the compound boundary conditions presented in this paper.

Abstract: The concrete voided slab pretensioned with CFRP tendons is a new type slab for bridge construction. The problems such as the anchorage, loss of prestress, prestressed tendons configuration etc. are discussed, then through the analysis of structure, the characteristics and key points of design methods are put forward. With a 20m span slab as an example, a comparative study is conducted on the concrete voided slab pretensioned with different tendons of CFRP or steel. The analysis shows that the concrete voided slab pretensioned with CFRP tendons is feasible in engineering.

Abstract: Prefabricated house is a new kind of temporary structure. It has the advantages of extensibility and diversity, and it is also easy to assemble and disassemble. This paper performed the dynamic characteristic test of 4 prefabricated houses of light-weight steel structure on the site by using SVSA, and got the natural frequencies, damping ratios and vibrational modes of these structures. To study the effects of infill walls to the dynamic characteristic of structures, two different modes were built. By comparing the results of numerical evaluation and actual data, the paper analyzed the dynamic characteristic of prefabricated houses of light-weight steel structure. Analysis suggests that the vibrational modes of prefabricated houses of light-weight steel structure are in shear shape, and the damping ratios are between 0.6% and 2%. The infill walls and the pull rods between columns can shorten the natural period of structures, so the computation period should be reduced in the aseismatic design.

Abstract: Based on the characteristics of organic glass, organic glass plate is adopted to establish the test model, and through the static stress and strain values of stress and strain test model, the theory is simulated by using ANSYS finite element software, at the same time, through the theoretical analysis and the method of combining the structure model test, the truncated hip structure, the mechanical properties of special section.

Abstract: Because of its remarkable advantages, inorganic polymer concrete has been paid much attention by academic and engineering field in recent years. On the basis of inorganic polymer concrete temperature-stress test, the temperature field of concrete pouring process is simulated by using the finite element software ANSYS. The related thermodynamic properties of inorganic polymer concrete are discussed. Studies have shown that the temperature-time curve of inorganic polymer concrete pouring process has the same trend with that of the normal concrete. Temperature contours show a ring-shaped distribution. When the internal temperature of specimen reaches the peak, the center temperature is 44.947 degrees Celsius and the surface is 22.216 degrees Celsius. The results have certain value to explore the early cracking of inorganic polymer concrete.

Abstract: Masonry infills are commonly used in reinforced concrete (RC) frame structures. In this paper a separate finite element modelling method is proposed and used to study the lateral behaviour of single-storey one-bay masonry infilled frames with openings under monotonic horizontal loading. The interface friction model and the surface-based cohesive model are combined to simulate masonry interface and the interface between masonry wall and RC frame. Damage plastic model of material property is adapted to capture the brittle behaviour of concrete and bricks. Appropriate experimental data available from the literature are utilized to verify the model. The comparison between the numerical analysis and test results indicates that the proposed FE modelling method can predict the masonry infill wall’s crack patterns and the lateral strength and stiffness of the structure with window or door opening successfully.

Abstract: The incorporation of a small amount of steel fibers or fine polypropylene fibers in concrete can increase its impact resistance. But steel fiber has the problems of corrosion, high cost and high mess. The effect of fine polypropylene fibers in inhibiting the impact crack is not effective. The research was taken to measure the properties of fresh concrete mixture of Synthetic Macro-fiber reinforced concrete. And investigated the influence of fiber length and volume fraction on the impact resistance of Synthetic Macro-fiber reinforced concrete. The results showed that these fibers could obviously improve the impact resistance of concrete. There was a best Synthetic Macro-fiber volume fraction. The length of the Synthetic Macro-fiber had a certain influence on the impact resistance of concrete.

Abstract: In the present paper, we investigate the effect of a padding-plate on the behavior of extended end-plate semi-rigid connections. The numerical simulations were carried out for a standard extended end-plate connection joint without padding-plate and two connection joints with 4mm and 6mm thick padding-plates. The existing experimental results verified the validity of the numerical model. The numerical results have shown that a thin padding-plate will more or less decline the carrying load capacity of the connection joint but greatly improve the connect ductility. Filling a thin padding-plate in the end-plate connection is feasible and brings the forewarning function.

Abstract: Using Finite Element Method simulating respectively Square Steel Tubular High-strength concrete inner set CFRP round pipe beam and Ordinary Square Steel Tubular High-strength concrete beam. Comparative analysis of the effect of the Mechanical Properties of inner set CFRP round pipe to components ; Studying on the effect of Mechanical Properties of Square Steel Tubular High-strength concrete inner set CFRP round pipe under with different arrangement ratio of CFRP and strength grade of concrete. Based on calculation we can see under cyclic loading Square Steel Tubular High-strength concrete inner set CFRP round pipe beams have quite different failure characteristics with Ordinary beams, the curve of moment-curvature is plump, having good energy absorption capacity and seismic behavior;The arrangement ratio of CFRP and the strength grade of concrete have great influence to the seismic behavior; of Square Steel Tubular High-strength concrete inner set CFRP round pipe beams, with the increasing of the layer number of CFRP round pipe, the improving of concrete strength grade, seismic behavior;of the beams is significant strengthened. Showing that inner set CFRP round pipe can significantly increase seismic behavior of Square Steel Tubular High-strength concrete beams.

Abstract: On account of the Wind Turbine Foundation Design Rules of China (trial implementation), the grid method is used to form an optimization design for the shell type foundation of the wind turbo-generator, using concrete dosage as the objective function. The constraint condition of the optimization meets the bearing capacity of the foundation and the compressive stress at the edge of foundation is greater than or equal to zero, reaching optimal relation between the central non-contact area and the contact area. Meanwhile, the finite element analysis on the shell type foundation of a wind turbo-generator is numerically performed in this paper by using ANSYS, to verify the feasibility of optimization scheme. The results show that this optimization scheme which can reduce the cost of wind power engineering project satisfies the requirement of design rules, saving the consumption of the concrete, and it has obvious economic benefits.