Applied Mechanics and Materials Vols. 351-352

Abstract: Based on test results of two full-scale reinforced concrete beam-column joints, carrying capacities of core areas of the joints were calculated and modified based on the strut-and-tie model. The results indicate that the capacities calculated with h-D-regions is smaller than those with h/2-D-regions, and the calculated results with h/2-D-regions agree better with the test results.

Abstract: Top-and-seat angle connection is a type of semi-rigid connection, usually used in steel frame. The stress distribution and the formation of plastic hinge of connection were analyzed using ANSYS. According to the results of FEM analysis, theoretical model of the top angle was proposed. And then, the ultimate moment formula of connection was proposed based on the Mises criterion. For verifying the correction of ultimate moment formula, 13 FEM models were built and ultimate moments were calculated. The formula proposed by the article agreed well with the results of the FEM analysis. And it proves that, the ultimate moment formula of top-and-seat angle semi-rigid connection can be used in the design.

Abstract: In order to verify the accuracy of estimation theory on cables parameters in prestress-mega-brace steel frame structure, several groups of structure models were designed, and the comparison between numerical analysis and estimation theory was completed, further the cause of large error between them was found out, at last correction formula was put and verified by numerical tests. The study shows that cable parameters of this new structure are sensitive to the side columns axial deformation, and the accuracy of correction formulas is greatly improved owing to considering the influence of side columns axial deformation.

Abstract: The application of perforated shell gradually increased, but the current design method has no explicit provisions. In this paper, based on large depth-to-span ratio and openings of single-layer spherical lattice shells structure for static and dynamic analysis, and the effects of opening and not opening shell difference of internal force under static load and deformation, I put forward the design proposal.

Abstract: Because of solar radiation and the atmospheric temperature rise, the temperature change of the steel box girder bridge be larger. Thermal conductivity and sensitivity to the temperature change of steel is very good. The impact of temperature effect can be compared with the dead and live load under certain circumstances. Taking a bridge as example, the relative deformation of flat steel box-shaped girder is analyzed with the finite element analysis software. The results can be reference for other bridges.

Abstract: Modulus of elasticity is an important input parameter in all kinds of structural analyses. The mathematical model used to identify the structural elastic modulus with measured Frequencies and mode shapes at several points is thusly built up in this paper, and then Gradient-Regularization method, an inverse problem solution method, is employed to solve the problem. General finite element program is compiled, and numerical examples have proved that the method of this thesis is efficient. The issues such as the choice of model error and the choice of measuring points are discussed as well.

Abstract: In order to simulate dynamic response of homogeneous elastic semi-infinite foundation; established 2 D and 3 D model of different artificial boundaries in large finite element software, for surface source problem and inner source problem as example, comparison and analysis of dynamic response of different artificial boundaries; viscous-spring artificial boundary should be adopted in dynamic calculation of homogeneous elastic semi-infinite foundation.

Abstract: Structure vibration response induced by human has become an important problem which draws more attention. This paper is concerned with the calculation of human-induced vibration. Based on the summary and analysis of numerical integration technique, we choice one more suitable method to model the floor vibration submitted to human. According to the representative continuous walking load time history, large calculation was made. Through the analysis of floor vibration response and regular pattern, the research in this paper can provide references and suggestions on human-induced vibration problems in practical engineering.

Abstract: A new tall building structure is presented -- skip-floor staggered shear wall structure. According to the result of nonlinear analysis and experiment study, this new structural system has good economic benefits and better structural behavior. In order to study its spatial nonlinear properties, based on a 3D nonlinear FEM analysis model, the 3D seismic nonlinear analysis is provided by considering both spatial effect and influence of slab and connecting beam. It shows, compared with traditional coupled shear wall structure, the skip-floor staggered shear wall structure has superiority in many respects, such as providing bigger space and lateral stiffness, reducing seismic force, etc. Therefore, this new structural system has wide applications.

Abstract: Concrete-filled steel tube reinforced concrete (CFSTRC) columns are currently being studied as a popular method to improve the shear strength, the ductility and the seismic behaviour of reinforced concrete (RC) columns. Owing to the complexity of confinement provided by steel tubes and stirrups, the behaviour of CFSTRC column is difficult to be accurately simulated. Thus,so far there is not a finite element (FE) model for CFSTRC columns. For studying the performance of this composite column, a FE model was developed based on the existing test results and theories. The predicted results using this FE model agree with the test results, which means that this model can be applied to carry out the further mechanism analysis.