Applied Mechanics and Materials Vols. 71-78

Abstract: This paper tries to research on the parametric design technology of Qing-Dynasty architecture in China. It contacts the character of Da-mu-zuo in china Qing-Dynasty, the modern parametric design technology-- Geometric Description Language (GDL) to establish the elements model of Da-mu-zuo, and then use the elements to build a parametric model of one floor and four edged eaves wood framework by means of parametric design. At last the application of the parametric model is studied.

Abstract: Joint’s stiffness has important influence on stability bearing capacity of large-span spatial reticulated shell. The welded hollow spherical joint with rib stiffeners is a type of joint applied widely on large-span spatial reticulated shell. In this paper, the axial flexibility and flexural stiffness of welded hollow spherical joint with different rib stiffeners are analyzed with the FEM software ANSYS, compared with the non-rib hollow spherical joint’s stiffness, then the calculation formulas of the axial flexibility and flexural stiffness under different rib stiffeners are given through regression analysis. Some important conclusions were obtained, which can provide theoretical foundation for the stability bearing capacity analysis considering joint’s stiffness and can be applied on practical design..

Abstract: This paper carries out stability analysis on plate-cone reticulated shell considering geometrical nonlinearity of cooperating work between plates and members. In this paper, stability behavior of different kinds of plate-cone reticulated shell considering geometrical nonlinearity is analyzed by using the software ANSYS, tracking complete process balance path for load-displacement by using arc-length method, the several problems of plate-cone reticulated shell are studied, such as destruction mechanism, structural ductility, ultimate bearing capacity and strength reserve, some important conclusions are obtained. After analyzing the stability behavior of double-layer reticulated shell by ANSYS and comparing with plate-cone reticulated shell, it is proved that plate-cone reticulated shell is more advantageous than double-layer reticulated shell in the aspect of stability behavior.

Abstract: Sixteen full-size single-storey shear walls 6.0 m in length and 2.44 m in height were tested: half with a flexible and half with a rigid load spreader. In addition, four full-size shear walls representing a typical two-storey configuration were tested. Comparisons of the initial stiffness, ultimate load and displacement, energy dissipation and axial force in anchor bolts of the test walls are presented. An increase of lateral load capacity due to rigid load spreader beam and from a second storey has been confirmed.

Abstract: For study the influence caused by geobelt and the mechanism of the strength increment in the reinforced foundation, the author analyzed stress state in each zone with reinforced and unreinforced, combined with the Mohr-Coulomb yield criterion, found the stress variation relationship between and in both foundations, which are found by the stress analysis method and geometry analysis method under the extreme state condition. The extreme normal stress incremental of vertical direction was solved in reinforced foundation. The essence of strength increment in reinforced foundation is revealed. The reliability of theoretical analysis was proved by numerical simulation. The conclusions show that increases in the active extreme equilibrium zone I and the passive extreme equilibrium zone Ⅲ, increases upper geobelt and decreases under geobelt in the transition zone ; the normal stress of each zone have changed correspondingly, the incremental variation of in I zone and the in Ⅲ zone has pseudo-cohesion.

Abstract: With the increasing in freezing shaft sinking depth of the mine，Mine permanent derrick was located into the frozen wall. The internal force distribution of the shaft-tower foundation was obtained by field measurement shaft-tower foundation basal pressure, foundation reinforced strain and the strain of concrete and foundation deformation of mechanical quantity. The numerical simulation of the interaction between coal derrick and foundation in freezing and thawing process shows that: the field measurement and numerical simulation laws were consistent and the values were in good agreement. It has very important theoretical and practical significance for the safe production of derrick and future derrick foundation design in freezing method construction.

Abstract: Basing on the LS-DYNA9703D’s user’s material coding platform, the user-subroutine is coded, and simulates the dynamic behaviors of the coupled-charge rock caused by the spherical charge blasting when the rock mass is surrounded by high confining pressure. The simulated results and related experimental results are compared. The results show that the modified C.C.Grigorian model agrees with the similar test and is suitable for the calculations on the cavity surrounded by high confining pressure, and swelling of the blasting cavity is significantly restricted and relative cavity’s radius and ratio of rock mass’s strength and confining pressure is nearly linear.

Abstract: This paper studies the technical application of the disposal for FA(fly ash) weak foundation of these abandoned fly ash pool by the construction technology of spraying powder pile, so that, not only these abandoned fly ash pool will be used effectively as soon as possible, but also the surrounding environmental pollution will be improved well. The construction technology of reinforcement weak foundation is efficient, low cost and no pollution. In order to argue it, this paper will discuss the mechanism and feasibility of the construction technology based on first phase project of Xinmei car limited liability company.

Abstract: Taking thermal parameters such as evaporating temperature, condensing temperature, superheating temperature and sub-cooled temperature as the basic variables and serving COP and heating capacity as evaluating indicators, this paper builds a series of mathematical models according to the rationale of WSHP and the correlation of its components and a simulation platform based on Laboratory Virtual Instrument Engineering Workbench (LabVIEW), simulates and analyzes the influence of thermal parameters on the performance of WSHP under variable working condition. The results show that evaporating temperature and condensing temperature have more significant effect on the performance of WSHP than both of superheating temperature and sub-cooled temperature and lower condensing temperature and higher evaporating temperature can raise the value of COP but reduce heating capacity. They also show that lower superheating temperature will bring higher value of COP but lower heating capacity and higher sub-cooled temperature can make both COP value and heating capacity increase. On the simulative condition, the influence rates of evaporating temperature, condensing temperature, superheating temperature and sub-cooled temperature relative to COP of WSHP respectively are 2.25%，2.61%，0.7% and 0.51% and the influence rates of these temperatures relative to heating capacity respectively are 1.32%，1.09%，0.58% and 0.77%. These results may provide with some reliable foundations on optimizing operation and control of WSHP under variable working condition.

Abstract: Stone masonry with micro-aggregate concrete joints has been widely used in long span arch bridges in China. However, the mechanical properties of this kind of high-strength masonry have been seldom studied. This paper presents compressive strength test study of eight groups of masonry specimens, which consist of C30 or C40 micro-aggregate concrete joints and five kinds of dressed stone blocks. The masonry mechanical behavior is described and test results are analyzed. An empiric formula of the masonry compressive strength is obtained. Finally, design value of masonry compressive strength is assessed and discussed.