Applied Mechanics and Materials Vols. 578-579

Abstract: This paper summarizes both advantages and disadvantages of elastic-plastic static and dynamics analysis methods and points out that dynamics analysis is more applicable and accurate for high-rise building analysis, compared to elastic-plastic static analysis. Then, some key issues of elastic-plastic dynamics time history analysis are introduced, based on the understanding of the latest progress of it, including element models of beam, column and shear wall, constitutive laws of steel and concrete, algorithm and analysis software. The research results provide helpful referencesto the application and population of dynamics analysis of tall building.

Abstract: Modern building walls is no longer a decoration, a simple external maintenance of the structure, but more and more deeply into an organic part of the whole building and involved in the functional construction of the entire building. The impact on the safety and energy saving performance of the whole building has come to a crucial point. A height of 237.7m core tube frame structure actually works in Qingdao cited as an example and the design of high-performance curtain wall system is studied. Many considerations in choosing the design and construction aspects of wall materials,design methods are described in watertight, airtight, wind pressure, the safety and reliability of modern curtain wall project.

Abstract: A shape optimization method based on strain energy is proposed for framed structures. This method combines free nodal shift, or restricted nodal shift on a specified line in the structural geometry. The optimization is based on nodal sensitivity information to amend the structural shape to achieve a structure with minimum strain energy. In this method, the design parameters, such as initial structure, supporting conditions, spatial constraints, etc, have significant influence on the final structural form; so various structural forms can be obtained by changing these design parameters in the project design phase. A numerical example is provided to illustrate the validity of this method and the mechanical behaviour of the structure. Results show that this can effectively reduce the structural bending moments and ensure sufficient structural stiffness.

Abstract: Aimed at the safety and serviceability issues caused by building decoration, following respects such as members of building decoration, connections between decoration members and main structure, and decoration influences on main structure have been discussed in this paper. Some suggestions and approaches, which can solve the structural problems of building decoration, have been suggested.

Abstract: Based on LS-DYNA, this paper compares four modeling methods for sandwich plates, e.g. the layered shell element, the solid and shell mixing element, the shared-node shell element and the thick shell element. Four modeling methods are used to simulate sandwich plates with different thickness-to-span ratios and different mesh sizes. The comparative analysis of the relationships between the mesh size, the CPU time and the convergence rate of the accuracy of four methods shows that the layered shell element and the shared-node shell element can accurately simulate sandwich plates with high efficiency.

Abstract: There are many uncertainty factors which can influence the carrier pile design and construction, some of them can lead the deformation characteristic of carrier pile more complex, especially the carrier pile shape parameter. Based on the on-site testing results and the finite element simulation conclusion, the paper studied the effects of shape parameter on deformation characteristics of the carrier pile from the aspect of bottom head size, pile diameter size, gravel soil zone size, etc. The research found that increase the size of the bottom head and the size gravel soil zone can reduce the amount of deformation to a certain extent; the effect of pile diameter size increase on reducing the deformation is not obvious.

Abstract: On the basis of concept design that involves both structural and architectural performance, this paper puts forward a new reinforced concrete high-rise building structure with a new special-shaped shear walls, presents an experimental study of the seismic performance of the new special-shaped shear walls under low reversed cyclic loading using MTS electro hydraulic servo system. Compared with experimental results, a finite element analysis on this special-shaped shear wall structure, which considers the nonlinearity of concrete structure, is found suitable. It shows that the experimental results fairly confirms to the calculated values, which indicates that this new structure has advantages as good architectural function, big effective space, high overall lateral stiffness, fine ductility, advanced seismic behavior, etc.. That is, the close agreement between the theoretical and experimental results indicates the proposed shear wall structure has wide applications.

Abstract: Static tests were conducted on a two-story mobile steel building under wind loads, and the building is made of two box units of steel frame structures with light composite wall panels. The mechanical behavior and the deformation properties of the structures were investigated. Based on the static equivalent principle, the lateral loads applied to load points of the top of the columns were imposed to simulate wind loads. The displacement values and the relative shifting values of the integral structures were received. The tests results show that the lateral deformations of the mobile buildings are greatly affected by the relative movements of both the box units.

Abstract: Filler stiffness and confinement effect on the frame structure under horizontal loads, making the earthquake severely damaged in recent years with filler frame structure. Research shows that the actual stiffness frame structure with infill walls and internal force distribution and pure framework significantly different. In this paper, the equivalent model analysis bracing frame structure filler with actual stiffness, elasticity and structure from stage to stage of the internal forces shaping the distribution were analyzed. The results show that the stiffness of the contribution and the confinement effect filler by factors geometry, masonry materials, the impact of the framework is not the same, need to consider the specific analysis and structural design.

Abstract: To study the methods for determination of residual mortar content adhered to recycled aggregate, this paper aims at three methods which are apparent density method, quench hot method and sulfate solution freezing-thawing method. These methods were compared by experiments and their basic principles were also respectively stated. The principles of the latter two methods are similar, which are to separate the residual mortar and aggregate by external factors. But the effects of the sulfate solution freezing-thawing method is better than that of quench hot method. Finally, the best method is chosen to provide some theoretical evidence and research methods in studies and uses of recycled concrete.