Applied Mechanics and Materials Vols. 405-408

Abstract: In this study, three tie force models of a 10-storey concrete frame structure were prepared to investigate the effects of these methods on the resistance of frame structures against progressive collapse. Four cases of different first-storey column removed were considered using nonlinear static analysis method and their performances were compared with each other. From the nonlinear static analysis, the tie force methods in DoD 2005 and DoD 2009 cannot improve progressive collapse resistance of the structure because horizontal cables don't play a full role. X-type tension cables provide alternative load paths after loss of a single column, and improve progressive collapse resistance of the structure. The X-type tie force model remained in stable condition after sudden removal of a corner column, an exterior column, or an interior column in the first storey.

Abstract: Half-screwed pile is a new kind of pile. Because of the unique design of variable cross-section, bearing principle and working traits are much more complex than the traditional linear pile. The vertical load transmission mechanism thoroughly is analyzed about half-screwed pile based on the static load experiment results. Researching its work performance, load transfer mechanism, the force mode, has important theoretical and practical significance.

Abstract: Through the experimental tests on 6 steel reinforced high-strength concrete columns under low cyclic horizontal loads, the influence on anti-seismic performance of the columns under different axial compression ratio, stirrup ratio and steel form is analyzed, and that anti-seismic performance of the columns is affected not only by axial compression ratio, but also by steel form. For steel reinforced high-strength concrete columns with different steel forms, the limit values of axial compression ratio may be adjusted, while the influence of stirrup ratio is not prominent.

Abstract: In order to analysis of concrete based on ABAQUS, A creep and shrinkage of concrete analysis program TDPA was developed. Firstly, the theory of creep and shrinkage effect of concrete was introduced. with the help of a Dirichlet series properties, creep stepwise recursive method was introduced to avoid stress history of large capacity storage; Secondly, using three user subroutine interface USDFLD, GETVRM, UEXPAN provided by ABAQUS, analysis program TDPA was developed by Fortran program language; Finally, typical long-term load tests of pre-stressed concrete and steel concrete composite members long term tests were selected to prove the reliability of TDPA. Research results show that: the TDAP has high applicability and reliability. It is suitable for a variety of creep and shrinkage prediction model, and provides an effective method for creep and shrinkage of concrete analysis on ABAQUS platform.

Abstract: The influence of length of chord and depth of truss on displacement and bearing capacity of truss construction platform was evaluated based on the results of the finite element analysis on eight different diameters of the top steel-tube truss construction platform of silo. The bearing capacity increases with increasing of depth of truss. The bearing capacity increases with decreasing of length of chord. The maximal displacement increases with increasing of the diameter in the same joint loads, and the displacement curve of model fits better.

Abstract: The force behavior of outer annular-stiffener type steel castellated beam (OATSCB) - concrete filled steel tube (CFST) is analyzed, and the feasibility of this kind of join is discussed. The loading process of the joint is simulated by using finite element software. By analyzing the hysteretic loops, skeleton curves, energy dissipation coefficient, equivalent viscous damping coefficient and ductility coefficient, the bearing capacity and seismic performance of this type of joint is studied. Before simulation, the validity of the simulation method is verified by using the previous experiment data of outer annular-stiffener type steel beam (OATSB) - CFST. It shows that the results from the finite element simulation method and the experiment are similar to each other, and the hysteretic loops is plump , the energy dissipation coefficient, equivalent viscous damping coefficient and ductility coefficient of this type of joint are high. It can be seen that this type of joint has good mechanical properties, and is easy to realize the yield mechanism of strong column weak beam.

Abstract: In this study, a design alternative for reinforced concrete (RC) coupling beamswith diagonal headed-bars that puts less reliance on diagonal reinforcement wasexperimentally investigated. The results show that specimen HB 50 exhibits a better stable behavior incomparison with specimens CON and HB 30. Test results showed that specimens HB75 with replacement ratio of 75 % diagonal headed – bars were efficient inresisting high shear load.

Abstract: The brace at the mid-span of beam of portal frame provides lateral constraint and improves its overall stability. By the nonlinear finite element method, the influences of structural parameters on the required bracing force for the beam bearing ultimate load were investigated when only one brace acting on the upper flange of beam at mid-span. The bracing force is correlated to the failure mode and configuration of beam of portal frame. The failure of beam trends to be controlled by the strength and the required bracing force increases when the stiffness of column increases. The required bracing force corresponding to the beam subjected to the ultimate load increases when the span of beam or the width of beam flange increases. The research work can be used as reference for the brace design for beam of portal frame.

Abstract: Steel shelves are widely used in logistics and warehousing, however, steel shelves often occur instability and other accidents in applications. Many of the destruction are instantaneous. [ Therefore, how to timely monitor the deformation of the shelf, especially the deformation of the shelves on the dynamic stress in the moment to ensure the safe of the shelves is very important. This article describes the method of using digital cameras to monitor dynamic and instantaneous deformation of shelf, which has the characteristics that easy to use, high accuracy, rapid reaction, and observing multi-point once, all-weather use, does not affect the normal work.

Abstract: With the development of the computer, the finite element software has been more and more widely used in civil engineering. Finite element software ABAQUS has a good effect on simulating the mechanical performance of concrete. In this paper, using the finite element software ABAQUS, the finite element simulation on mechanical properties of laminated slab with shear connector under uniform load has been carried on, based on which, the load-deflection curve of laminated slab with shear connector and shearing stress distribution of the shear connector were obtained. The loading progress of laminated slab with shear connector and failure mechanism of the shear connector were analyzed. According to the simulation results, the main problems to be solved in the future were put forwarded.