Advanced Materials Research Vols. 838-841

Abstract: There is presented a solution of the problem of centrally symmetric unsteady moisture transfer in a hollow spherical array, modeling part of ground mass, with the propagation of the moisture from the inner surface to periphery. At the second stage in mined the slow moisture transfer is solved quasi-stationary problem of moisture elasticity for inhomogeneous body because of uneven changing the deformation characteristics of the soil by saturated it with moisture. The term moisture elasticity is used by analogy with the term thermoelasticity since the presence of moisture in the material induce forced deformations which is similar to the temperature deformations and problems of heat and mass transfer use the same mathematics [.

Abstract: In the engineering project in Contemporary, Rapid construction is an advanced managing concept which core is fast. On the basis of the fuzzy risk, risk degree and fuzzy probability and risk analysis, this paper analyze the factors affecting rapid construction, and with different construction project factors fuzzy risk evaluation set is established. From the Angle of quantitative the risk analysis of hydraulic engineering in the influencing factors of construction schedule. On the impact of factors on construction schedule to different schemes are obtained quantitative values. We can choose the optimum construction scheme reduces risk.

Abstract: Fatigue failure of welded structure has been highly concerned in structural engineering field. At present, the numerical simulation method has been actively applied on fatigue life prediction of welded structures. In this paper, welding residual stress of a butt welded plate was simulated by thermal elastic-plastic finite element method, and welding residual stress relaxation behavior under overload was analyzed. Then, the fatigue life of the welding plate under cyclic loading was numerically predicted with considering the welding residual stress and welding residual stress relaxation, and the result was compared with that calculated according to current steel structures design code of China. The results show that, considering fatigue reliability, the fatigue life calculated based on design formulas of the steel design code is more conservative, and numerical method for fatigue life prediction of welded structures, considering the welding residual stress and welding residual stress relaxation, is a feasible method.

Abstract: Spherical welding lattice shell structures are usually used in stadiums and public buildings. The main difficult problems in construction are positioning of welding members and controlling welding deformations in three-dimensional space. The common positioning methods are poor in operability and accuracy, which cannot meet the demands of precise construction. In this paper, a three-dimensional positioner was developed according to the spherical latitude and longitude lines intersect positioning principle based on the Kitwitt monolayer welding lattice shell in Guangzhou Conghua Liuxi Square project. In addition, the welding deformations were controlled effectively by innovative technical measures. Good efficiency has been achieved in engineering practice with this technology and the installation is of high quality.

Abstract: This article presents definition and stages of pressure method of concreting piles, shows the main technological parameters of concreting pressure method.

Abstract: The finite element analysis method was adopted to simulate the masonry wall strengthened with steel strips and was verified by comparing with test results. The influence rules of two factors including the cross sectional area of steel strips and vertical compression were investigated. The results show that, as for unreinforced masonry wall, the relationship of the shear capacity of unreinforced masonry wall and the vertical compressive strain is linear under lateral load; the speed of stiffness degeneration is accelerated after the peak point of the curves, but decrease with the increasing of lateral displacement. As for masonry wall strengthened with steel strips, the shear capacity increases significantly, and shows nonlinear relationship with the cross section area of the steel strips and vertical compression; ductility is improved. Finally, a computational formula of shear capacity based on a lot of parametric analysis is proposed to calculate the sectional dimension of steel strips, and it provides theoretical foundation for establishing thorough design method of masonry wall strengthened with steel strips.

Abstract: Because of the seismic vulnerability of these masonry structures, many strengthened technologies for improving their its seismic performance of masonry panels have been improved in old days. In this paper, a rapid strengthening approach of masonry structures which is diagonal steel strips attached to the masonry panels is proposed. To investigate crack pattern, shear strength, lateral stiffness and ultimate displacement, four Specimens constructed at with 1:2 scale are designed. One specimen was not strengthened by steel strips, and the others strengthen by steel strips with different width and thickness. They are tested under combined constant vertical compression and cyclic lateral loading. The experimental results prove that reinforcement approach could a changed crack pattern. Also, it could significantly increase in the shear strength and lateral stiffness of masonry panels. The width of steel strips is more significant than the thickness of steel strips in strengthening shear strength and lateral stiffness of masonry wall.

Abstract: For cold-formed lipped channel columns with web stiffener, the distortional buckling stress may be lower than the local buckling and overall buckling stress, and thus it may control the design. A countermeasure to prevent the distortional buckling of such sections form happening by setting batten plates between two lips of the section was analyzed using the finite element program of ANSYS. Varying length and one way axial force eccentricity were concerned to observe the effect of the batten plates to the buckling behavior, load carrying capacities of the section in different cases. All the results can be the reference for later experimental study.

Abstract: Though fatigue failure is often happened in steel gate, fatigue design has not yet been included in design or evaluation standards in China. In this paper, analytical theory based structural stress method and structural stress based fatigue analysis method are combined and employed for fatigue life evaluation of plane steel gate. The variation of water head is taken into consideration for the conditions of gate running and resting. In order to give a valid evaluation, the weld located among all components is considered as rigid connection when calculating structural stress. Master S-N curve in ASME code is used for life evaluation. Example shows the method can be used for fatigue analysis of plane steel gate, and can be used to identify fatigue failure zone.

Abstract: Based on Yuzhen palace integral lifting engineering of Wudang Mountain, the writer uses the finite element analysis to simulate bearing capacity of section steel column in the bidirectional eccentricity. The finite element data is slightly larger than the test, but the date keep in same value in the main. During the process of the integral lifting, the bearing capacity of steel column will sharply decrease with the bidirectional eccentricity increasing and produce torsion; it has a lethal effect on the whole upper structure. And the writer analyzes the problem that how to avoid the eccentric problems from two aspects of the design and construction, and the writer proposes some relevant suggestions and opinions. It can provide reference that how to design and construction in a similar project.