Applied Mechanics and Materials Vols. 351-352

Abstract: There are some limitations on the calculation about effective length factor of the single-layer lattice shell structure`s component by the current specifications. That`s why Euler formula is commonly used to anti-push the effective length in engineering design. In traditional design, one or few components were used to calculate the effective length factor, and the single biggest value is assigned to all components for design. Owing to the coarse method, values of some components` effective length are too large or too small. This paper improved the traditional design method, and used excel in formula programming to calculate effective length factors of all components. Then all factors are assigned to all components for designing by SAP2000. At the end of the article, it explored the difference in this new design method with the traditional design method.

Abstract: Established the mechanical model of simply supported deep beam, calculation and analysis of simple supported deep beams by using finite element analysis software ANSYS, simulated the force characteristics and work performance of the deep beam. Provides the reference for the design and construction of deep beams.

Abstract: Oil storage tank plays an important role in modern oil industry. The development of large-scale oil storage tanks has resulted in the complexity of stress distribution and deformation situation of tank wall and tank bottom. Especially in soft foundations, the tank structure is susceptible to various types of settlement deflections. The most common type is planar inclined foundation. In this paper, the finite element model of large-scale oil storage tank was built according to the pattern of design and the deformation characteristic and stress distribution of large storage tank under the planar inclined foundation was obtained. Considering the floating roof, the ultimate value of large storage tank under the planar inclined foundation is determined.

Abstract: The constitutive model of core concrete was proposed, which was suitable for finite element (FE) analysis of rectangular concrete-filled steel tubular (CFST) columns with binding bars. Based on the ABAQUS FE platform, the USDFLD subroutine was compiled, which could consider the changing of Poisson ratio of many materials in loading process. A FE model was developed and used to simulate the rectangular CFST columns with binding bars. The mechanical behavior were analyzed for stress versus strain relationship curves, confined effect among steel tube, core concrete and binding bars, longitudinal stress distributions of core concrete. The results show that the FE results simulated by using constitutive relationship of core concrete of this paper are in good agreement with test results. The local buckling of steel tube is delayed which can make the yield of steel tube occur before ultimate strength of specimens, the concrete confinement of the corner regions and central regions is improved, the longitudinal stress of concrete is increased and the capacity and ductility of specimens are improved, by setting binding bars and decreasing the binding bars spacing.

Abstract: Yunnan Ruili spa resort sightseeing tower is a high-rise hybrid structure building, which is 52.8 meters in height. In the design process, for the purpose of ensuring the correctness and reliability of the model analysis and design, general finite element analysis software SATWE and ETABS are used for flexible modeling and analysis. Through controlling and adjusting related parameters, the reasonable calculation results are obtained, which can be regarded as the basis of the design. In this paper, relevant problems are also discussed for the foundation design and superstructure design of the tower.

Abstract: A large number of column-bracing systems for the horizontal braces unlocated at middle of columns with fixed-ended column base were modeled and analyzed by second-order analysis using finite element method, in which the random combination of the initial imperfections between columns and horizontal braces was well considered by Monte Carlo method. According to the analysis results, two kinds of instability modes of column-bracing system have been found, probability density function of the horizontal bracing forces unlocated at middle of columns with fixed-ended column base is established based on probability statistics, and the design formula of horizontal braces unlocated at middle of columns are also proposed.

Abstract: Light steel temporary building is commonly used in the construction site, with advantages on simple structure, repeat used and small deadweight. For light steel temporary structure building there are still not enough researches on the mechanical properties and mechanism of action, and there are still not enough relevant standards and requirements to conduct the design and construction of the buildings. In order to precede to theoretical study on frame structure of light steel temporary buildings a method by Finite Element Analysis was proposed. This method is based on FEA software, Ansys. Using this method a monolayer frame structure and a two-story frame structure and a trilaminar frame structure model were analyzed. The calculation results of horizontal displacements under design loads by FEA were obtained and discussed.

Abstract: In previous analysis and design of steel structure, connections (especially bearings) of construction membership in long-span structures are usually considered as rigid, partially released or entirely sliding. Practically, construction members mechanical property is always not idealized in rigid, released or entirely slide situation. In some cases, the joints are relevant in geometry deformation. In this paper, mechanical property of bearing will be researched considering bearings size effect and friction characteristic, and results will be statistically analyzed.

Abstract: Based on the width-to-thickness ratio of plates, four types of sections are proposed and post-buckling design, elastic design, elastic-plastic design and plastic design are employed respectively. Taking the post-buckling strength of plates into consideration, cold-formed thin-wall steel structures shall adopt calculation by effective width, also post-buckling design, and the restrain coefficient k₁ of the plate groups shall be used. The direct strength method is quite convenient but needs the finite strip method. The computation of medially stiffened plates and distortional buckling has been figured out and thus further research and supplement are necessary.

Abstract: According to the composite column of double back to back cold-formed thin-walled C steel connected with gusset plate, the experiment and finite element analysis were carried out to study the stability bearing capacity and failure modes of columns under eccentric loading. The factors such as slenderness ratio, eccentricity, gusset plate thickness and spacing were discussed, which produced the impacts to bearing capacity, and the relationship between stiffness and axial load. The results revealed that the failure modes belonged to the in-plane-flexural buckling and local-buckling of the pressurized flanges and webs of the columns. Slenderness ratio, eccentricity and gusset plate spacing are the major factors that affected the mechanical behavior, while the gusset plate thickness has no obvious impact. In the end, compared with the calculation of the bearing capacity of the cold-formed thin-walled column and GB50018-2002, some suggestions based on this composite column calculation were put forward, and the correction coefficient of bearing capacity of the composite columns were given.