Advanced Materials Research Vol. 1020

Abstract: The effect of curvature radius on the mechanical properties of continuous rigid frame bridge with high pier and long span is studied in this paper. Taking the Wayaobao Bridge as the research object, the models including both of the linear rigid frame bridge and the different radius of curvature rigid frame bridge are established by using the finite element software MIDAS/Civil, and the mechanical properties of the finished stage are analyzed, and the influence of the radius of curvature on the deformation and internal force of continuous rigid frame bridge are researched. The alteration in curvature radius almost had no influence on the bridge vertical displacement, vertical bending moment. The tangential displacement gradually become smaller, but little change with the decrease of bridge’s curvature radius.The radial displacement, transverse bending moment, torque of the bridge increased with the decrease of bridge’s curvature radius.The force and deformation of the bridge structure are more unfavorable with the decrease of bridge's curvature radius. The study can provide some suggestions for design and construction control of curved frame bridge.

Abstract: As a bridge with a large span, suspension bridge has obvious advantage in the current cross-sea engineering. In order to achieve longer span capacity, long-span multi-tower suspension bridge programs were repeatedly proposed. Due to the increase in the number of tower, the mechanical behavior would be inevitably different with the ordinary two-tower suspension bridge. For better grasp the difference of the mechanical properties, Midas civil 2011 is used to model to analyze. Suspension bridge models whose spans are 1080m with different towers (two, three, four, five, six,) are established to analyze the change in the mechanical properties under the action of vehicle load. The results show that the mechanical properties of multi-tower suspension bridge are quietly different from two-tower suspension bridge and with the increase in the number of bridge tower, the displacements of main girder and main tower have large difference. When the number of tower is more than or equal to four, multi-tower suspension bridges have little difference in the mechanical properties and that means multi-tower effect is not obvious.

Abstract: According to cable tension calculation of cable-stayed bridge on construction, and combining with the example of Xinzao Pearl River Grand Bridge, this work proposes forward-calculation method to analyze cable tension force on construction and establishes geometric calculation simulation model to compare measured cable tension with theoretical cable tension. This paper introduces some kinds of methods calculating cable tension force on construction. It importantly discusses the principle and method of forward-calculation and the practical application in the actual project. Spacial finite element model is established for analysis based on finite element software MIDAS and the application of forward-analysis iterative method is considered to analyze the cable tension on construction , then the method of determining cable force on construction is explored. Finally the result shows that the cable tension based on forward-calculation method is usually accurate, the measured value is approximately equal to the theoretical value and the error is in the extent permitted. The correctness and reliability of the frequency method is effectively confirmed and the cable tension calculation of the similar bridge on construction is compatibly applied.

Abstract: Continuous rigid frame bridge is widely used in bridge construction because of its superior characteristics, with its piers increasing. Shown in previous studies, the key positions of the side pier or lower pier at the top and the bottom of the pier yield firstly and then get into the plastic stage in the action of earthquake. So in this condition, dynamic analysis of the continuous rigid frame bridge impacted by the consolidation damage that may occur at the pier top and the bottom is studied in the paper. In the process, the consolidation damage degree is introduced in order to characterize the damage qualitatively. And then Midas/Civil 2010 is adopted to analyze the structure by modeling. Finally, some conclusions are obtained, including that the consolidation damage has a significant impact on the dynamic features, effect on the structure when the damage respectively happens at the two key sections is extremely close, and almost all value of the dynamic feature changes is located in the condition when the damage degree is less than 10%. The job above all in this paper may provide a valuable reference for the seismic analysis and the technique of damage identification and location in continuous rigid frame bridge.

Abstract: In the paper stated method that is grounded on the following idea, firstly applied in the work [1]. The critical state equation of compression plate is obtained from according equations of lateral bending of same plate, if is made the substitution -P=T10Wx''+2S0T10Wxy''+T20Wy'' where T10, S°, T20-are the components of external compressive loading. Further the obtained differential equations are transferred into algebraic equations by approximation of deflection by system of preliminary selected functions and application of one of variation methods. From the obtained algebraic equations are defined the parameters of critical loading. The applied in the work method is that firstly is solved the static problem and are found deflection functions, subjected to concentrated loading in the point x=ξ, y=η, corresponding for al singularities, arising due the cuts influence. Actually at this are found the Green’s functions. This task is solved analytically and due the application of special discontinuous functions, the function of deflection is expressed as rapidly convergence series. Practically for the definition of deflection is sufficient the keeping of one term of series. Due the stated above [2] also is considered the solution in the refined formulation. The definition of critical loading on three-layered plate on grounded on the accordingly static problem.

Abstract: The paper presents a numerical analysis of aluminium cellular beams. The ADINA System based on the Finite Element Method (FEM) is used for the calculations. The beams made of 6061-T6 aluminium alloy are analysed. Such beams are used in civil engineering and aircrafts industry as the load-bearing parts. The beam components are joined by Refill Friction Stir Spot Welding (RFSSW). The I-profile beams with cells of different diameters, i.e. 62, 72 and 82 mm, in the webs are analysed. In each case, cell arrangement in the beam is the same. The bending of the fixed-end beams with concentrated load is analysed. Extreme values of the displacement for the beams material and RFSSW joints are emphasized. The effective stresses for the beams and FSSW joints are calculated. Normal stresses in the top flanges, bottom flanges and webs are given.

Abstract: The paper presents a numerical analysis of cellular beams with cells of different arrangement. The ADINA System based on the Finite Element Method (FEM) is used in the calculations. The beams made of 6061-T6 aluminum alloy are analysed. Such beams are used in civil engineering and aircraft industry as load-bearing parts. The beam components are joined by Refill Friction Stir Spot Welding (RFSSW). The I-profile beams with cell diameter of 62 mm are analysed. The beam length is 0.8 m and its cross section is 50x100mm. The bending of fixed-end beams with concentrated load is analysed. Extreme values of the displacement for the beams material and RFSSW joints are emphasized. The effective stresses for the beams and RFSSW joints are calculated. Normal stresses in the top flanges, bottom flanges and webs are given.

Abstract: Adina is a software that supports analysis of both pre-defined models and analysis of the models defined independently. The paper presents a comparative analysis of the distribution of effective stress in simple elastic structures made of incompressible hyperelastic Mooney - Rivlin and Zahorski materials. To carry out numerical calculations for the Zahorski material it was necessary to make modifications of 2D and 3D libraries in the ADINA software which has been completed in the authorial process. Conclusions are presented in the conclusions at the end of the study.

Abstract: The paper presents the waves propagation (disturbances) in the simple elastic structures aided by ADINA program. Modeling of the waves was performed in a rod and the elastic layer. The elastic structures being analyzed have been made of isotropic compressible and incompressible materials which represent hyperelastic materials, i.e. with a strictly defined elastic potential description. Conclusions are presented in the summary at the end of the study.

Abstract: Timber-concrete composite structures, which use advantages of both materials, are suitable for new works and reconstructions of civil and residential buildings. There are described many methods of joining between timber beam and concrete slab in technical literature. Joints are more and more sophisticated which brings higher demands on work control and technology. Main goal of the paper is in design technologically low demanding method of joining with steel plates and nails, to test its shear strength and to compare it with other similar joining .