Applied Mechanics and Materials Vols. 94-96

Abstract: Reinforced concrete calculation theories at the present stage are mainly based on experimental results of small size specimens, studies on the size effect of flexural capacity of large-scale reinforced concrete beam are not sufficient. Main research contents in this paper are the size influence on bending performance of under-reinforced beam, which can help to revise the related design theory. The paper collects test information of five different section size samples in different loading stage, including bearing capacity, deflection, section strain and so on. The total number of specimens is 13.Based on test failure process, development of cracks and deflections, analysis on section stress and strain, the safety of related bearing capacity formula is verified in research scale.It is also found that the safety reserve of calculation theory shows a trend of decrease with the specimen dimension increasing. As for large-size bending specimens, the code value of ultimate strain under non-uniform compression is bigger than test value.

Abstract: The paper is from studying the flood experiment of the Town Housings’ structure form of the widespread existence,to explore the breakage mechanism of the town housing in flood,to guide the people how to improve the Town Housings’structure in the actuality and protect the people’s safety of the life and property.

Abstract: Desalination of seawater has played an important role in many arid regions in the world. There are many methods for desalination of seawater, such as MED, MSF, RO, ED, TVC, and MVC, etc. Different methods have different advantages and disadvantages. In the present work, a new method for desalination of seawater with steam-ejector refrigeration plant was introduced. The main purpose of the new method is a hybrid plant of TVC and steam-ejector refrigeration. In the hybrid circle, no other energy was need. When the steam-ejector refrigeration plant is working, the seawater as cooling water is introduced into evaporator of TVC and evaporates. The vapor getting in TVC is extracted by a second steam-ejector, together with the active steam, is used as source of heat for desalination. The main advantage of this hybrid plant is that part of the heat energy of cooling water in refrigeration is reused. Comparing with other distillation method desalination of seawater, the energy consumption is much less. Especially on marine usage, the advantage is clear.

Abstract: This paper introduces the status quo and development trend of coupling beam structure system at home and abroad, proposes a new type of buckling-restrained brace steel coupling beam structure system and puts forward main problems to be studied regarding the structure systems of buckling-restrained brace steel coupling beam and coupled shear wall with buckling-restrained brace steel coupling beam.

Abstract: In this paper, a tangent stiffness matrix of members with end springs of reticulated shell is derived on the basis of Timoshenko’s beam-column theory. In this matrix, joint’s axial stiffness and bending stiffness are considering together, non-linear beam-column element with end springs and rigid ends is taken as the analysis model of members of reticulated shell. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. Higher order terms in the displacement function are considered. So this matrix is perfect and more precise than Oran’s tangent stiffness matrix. An example of a single layer reticulated shell is provided, which verified the correctness and good accuracy of the present model, and this model can be suited to the non-liner stablity analysis of reticulated shell.

Abstract: According to the dual impact of infill wall on the frame structures, the normal infill wall has been improved. In order to investigate the seismic behavior of infill frame structures with different vertical slit width under reversed cyclic loading, experimental research on three groups of infill frame structures has been performed. And the failure characteristic, bearing capacity, ductility and hysteretic property are analyzed. From the results of test, it can be seen that infill frame structures with slits have a good seismic performance and the vertical slit width is an important factor, which affects the seismic behavior of the frames. With the increase of the slit width, the yield load and bearing capability decline significantly and the ductility becomes low sharply. Moreover, three groups of infill frame structures also have a better deformation behavior, which can meet the requirement of antiseismic design.

Abstract: The box structure is a typical underground protective structure, whose mechanical response to explosion seismic is of great interest in protection engineering. In this work, the rectangular force and combining dynamic and static methods have been employed to identify the mechanical behavior of deep underground structure under explosion seismic. The effects of ratio of side length, the incident angle, surrounding properties etc. were considered and the mechanical model which can describe the interaction between structure and soil was also developed. Finally, the dynamic response of box-type structure was analyzed.

Abstract: Based on the study of some post-disaster reconstruction project examples and related policy documents,this article analyses the existing problems of the post-disaster reconstruction project engineering cost combining with the actual engineering projects of the post-Wenchuan earthquake reconstruction. Then it discusses the factors that affect the post-disaster reconstruction project engineering cost and puts forward some suggestions for it in the end. The study of this paper expects to provide some theoretical and practical references for the subsequent engineering practices, and hopes not only promoting the limited government post-disaster reconstruction special funds to realize their maximum utility, but also enhancing the whole level of our countries'reconstruction management and engineering cost control.

Abstract: According to the superposition principle of building structure, the lateral deformation mode of pre-stressed mega bracing-steel frame structure was analyzed, then the relation between the structural maximum inter-story drift and cross section area of cable was further established. Based on the area of cable derived by the design target value of inter-story drift, the qualitative estimation theory on cross section area of the cable is finally determined.

Abstract: The combined connection with welds and bolds has advantages of both welds and bolts connections, and can be widely used in reinforcing the joint in steel structure. In this paper, the Finite Element Method (FEM) was taken to analyze the carrying capacity of the combined connection with bolts and welds, and the results ware compared with those come from experimental investigation. Further analysis based on FEM ware performed to research the failure mode and bearing performance of the combined connection and the contribution of bolts and welds .Advice was provided for related design.