Advanced Materials Research Vols. 1008-1009

Abstract: In many fields such as asphalt concrete pavement, hot and liquid asphalt is a kind of necessary material. Medium pressure water heating is a new method for asphalt storage or heating with advantages such as safety, energy conservation and low pollution. Heating furnace is the key part for this closed cycle system, and two 800KW medium pressure water heating furnaces are adopted to supply enough thermal energy for the heating system to ensure asphalt working temperature. To ensure asphalt storage volume and strength, size and steel plate thickness of asphalt tank are calculated. Three-layer structure of tank wall is designed to reduce heat dissipation, which is of 5mm inner wall and 1mm outer protection layer filled with 60mm rock wool layer.

Abstract: The continuous development of city has brought greater pressure to urban traffic, in order to alleviate the pressure of traffic conductor, this paper puts forward a design scheme of intelligent arm using in traffic conductor. The intelligent arm consists of steering gear and kinds of stents, it has two joints and each joint with 360 degrees of freedom. The arm uses K60 MCU as the controller, acquires the traffic conditions from sensors, and poses kinds of gesture to direct traffic automatically. The intelligent arm can overcome the limitations of environmental climate, and replace some traffic police work. The design has the important significance for developing intelligent traffic.

Abstract: An application of an energy saving device for air compressor in intelligent industrial park is introduced in this paper. The program of air compressor energy saving system, working principle, and technical features are described in details. Actual running result shows that the air compressor device can greatly improve the power quality of enterprise, enhance the power factor. This device plays a role of energy saver in manufacturing process, indicates the direction of technical innovation in intelligent power for industrial park, and provides reliable technical support.

Abstract: This paper uses general finite element software Abaqus to simulate three Chinese traditional hall-style structures recorded in the book <<Yingzao Fashi>>. With Abaqus having an advantage in dealing with contact problems, three hall-style timber structure finite element analysis models have been established within the 3D solid element which is used to model beams, columns, brackets and other structural members in the modeling. Contact pairs also have been used to simulate the interaction between the structure members like beam-column contact pair, column-foot foundation contact pair and dougong-bracket beam contact pair and so on. In the modeling process, some simplifying assumptions have been used for many complex structural members and interactions between them being used in Chinese hall-style structure. The model was finally tested by gravity load and vertical load.

Abstract: Yingxian Wood Pagoda is the highest standing ancient wood structure in China,with four shorter but stiffer storeys hidden between the five apparent storeys. The beam-colunm joints are highly varied. In this study,a model of typical beam-column joints of the pagoda was simulated in Abaqus. The material used in models was similar to the ones of the pagoda.Non-destructive cyclic loading test of the models under different vertical load were conducted.The hysteretic curves underdifferent vertical load were drawn from the test.And the skeleton curves were obtained by linking all peak moment points of each hysteretic loop. The energy –dissipation performance and bending stiffness of models were derived and discussed.

Abstract: Masonry structure, the number of large, wide area distribution, and earthquake damage survey, masonry structure severely damaged. In this paper, using the finite element tool ABAQUS, combined with an equivalent volume element simulation technology, the establishment of spatial finite element model to study the loading height of the brick wall failure modes and effects of seismic performance issues in depth analysis of its constant vertical pressure, different loading height seismic performance and failure modes under. The results show that: the greater the load height, the wall more prone to bending failure, otherwise prone to shear failure; loading height bigger, better ductility of the wall, the ultimate bearing capacity is smaller.

Abstract: In this paper, use the finite element analysis software ABAQUS to firstly analyze the mechanical response to simplified model of Chuan-dou type wooden structure under its own weight, followed by the analysis of the structure under horizontal reciprocating loading, and finally seismic performance analysis of the structure under earthquake. Use the same contact properties between the members, and the differences between dynamic friction coefficient and static friction coefficient are not distinguished. The results show that the wooden structure of ancient houses has good seismic performance, which is mainly achieved by the frame deformation and friction slip.

Abstract: With the rapid economic development of our country and the improvement of housing function requirement and the lack of land for construction, adding layer structure has become a trend in the development of construction industry. Now a lot of adding layer buildings have sprung up both at home and abroad. Adding layer structure needs to undertake seismic calculation to ensure the reliability under the earthquake effect. At present, many researchers’ studies of the adding layer structure only stay in elastic stage, and there are only very little researches about the static and dynamic elastic-plastic of the structure. Based on the literature and art center of Changzhi city as the background, it is introduced the calculation process, which adopted the EPDA& PUSH software for the static and dynamic elastic-plastic analysis of reinforced concrete structure, obtained the carrying capacity and the deformation under the rare earthquake, and analyzed the results. By comparison, the results of the static and dynamic elastic-plastic analysis are similar.

Abstract: In this paper, based on the theories of truss structure with the characteristics of the aqueduct structure, puts forward a new type of aqueduct structure system, the cable pretensioned truss structure under the use of state for the key point’s response spectrum analysis and elastic time history response analysis. The stresses induced by the analysis of structure of key parts are meeting the requirements of the current specifications, in the flexible working state. Pretensioned steel in this paper, the research aims to the whole assembly of the aqueduct structure characteristics and the theoretical analysis of the dynamic characteristics of this kind of structure design for the future research and provide some reference, so as to promote the new application and development in the form of aqueduct.

Abstract: There exists horizontal friction besides vertically pressure at the foundations' underside. Considering the effect of friction on the expansion of plastic zones in subgrade is needed to accurately evaluate subgrade’s safety. A strip footing is chose as the research object. Assuming the distribution of friction at the strip footing’s underside is two symmetrical triangles. With the help of Flamant formula and via definite integration, the formulas of stress in subgrade induced by the friction are got. Setting the Coulomb-Mohr strength theory as the yielding criterion for the subgrade soil, through the comparison among the different friction angles in expansion characteristics of plastic zones, the research object is achieved. Two major conclusions as following: (1) the friction makes the plastic zones appear in advance, the initial critical load get smaller with the friction get bigger; (2) the plastic zones get broader in horizontal direction under the action of the friction, this makes the plastic zones in two sides beneath the footing run-through later and so enhances the subgrade’s ultimate bearing capacity.