Applied Mechanics and Materials Vols. 638-640

Abstract: According to the experimental data of steel beam for Honglu steel company continuous combination,a newer finite element model is presented.The model takes into account the effect by linear material,slip between concrete and steel beam and prestress as well.Five samples of steel-concrete composite beam are calculated with the model.and the stress, strain, crack propagation of nonlinear numerical simulation analysis is carried out , then the continuous composite cross in the load deflection curve of beams is obtained. As the calculation and analysis show that, the results of numerical analysis and experimental data are consistent with the analysis model. And the model is reasonable and effective.This study provides the basis for the application of continuous steel-concrete composite beams.

Abstract: Plates are commonly used in engineering structures. However crack is the most common form of damages in the plate structures. The crack in the plate will open and close during vibrational cycle, making the cracked structure with nonlinear dynamic characteristics. Based on vibrational power flow theory, the nonlinear dynamic analysis of a plate structure is carried out. The contact elements are used to simulate the nonlinear behavior of the breathing crack. Aiming to study the input power characteristics and the super harmonic resonance of a breathing cracked plate which is under the resonant excitation. By the finite element calculation, the structural input power curve is analyzed, which provides a theoretical basis for the damage identification of cracked structures.

Abstract: In this paper, the non-probabilistic reliability optimization problem of linear structural system with uncertain parameters described by interval models is proposed. The degree of the uncertainty is described by the size of the hypercube, and the maximum degree of variability the structure allows is measured by the non-probabilistic reliability index. The relation between the target of non-probabilistic reliability index and the fluctuation range of uncertain parameters is described by the geometric meaning of the reliability index. For the linear function, the uncertain parameters are expressed as the expression of the target value of non-probabilistic reliability index. Numerical example shows the validity and efficiency of the proposed method.

Abstract: LNG storage tank is an important department in the gas receiving station. LNG in the tank is flammable and explosive medium, once the tank damaged, disasters may be happened. So researching the dynamic response analysis is very necessary. In this paper, modal analysis of LNG outside tank were performed by ANSYS Workbench, the first six orders of mode shapes and their frequencies of LNG outside tank were concluded. Contrast vibration mode and natural frequency of the LNG storage tanks with ring beam and no ring beam, the influence of ring beam of LNG tank mode has been discussed. Conduct a series experiment by change the parameters of the ring beam, Parameters for ring beam effect on the inherent frequency and vibration mode of LNG outside tank has been researched. This research has provided the provided the reliable basis for the safety using of tanks and has built the base of the further dynamic response analysis.

Abstract: More than 40 prestressed composite space truss models of different dimensions are built with APDL design language, and the span, height, lattice number, prestressed value, section area of the chord, width and height of ribbed beam are chosen as design variables. With selecting total cost as objective function, constraint conditions such as strength, rigidity, stability, section size, prestressed limit and structural deflection are also considered, we conduct optimal design for structures by means of zero order optimization. From the results of regression analysis, the optimal span-to-height ratio, lattice number and empirical formula of optimal prestressed value can be found out for designers’ references.

Abstract: Guyed anchor is an important component of transmission line tower, and its stability directly affects the safety of the whole line. Under the condition of meeting the uplift tensile forces, the optimization design and analysis of the guyed anchor is studied through the optimization program using the method of network searching. The influence of the soil properties, the guyed anchor structure, the uplift tensile forces and directions on the optimized embedded depth of the guyed anchor is discussed in detail. These results will provide some theoretical evidences and technical supports for the guyed anchor manufacture and the selection of the embedded depth.

Abstract: Effects of different load modes, rise-span ratios and support conditions on out-of-plane buckling and differences between parabolic and circular arches were studied. With the increase of rise-span ratio, buckling loads of arches under vertical load uniformly distributed along the horizontal line get bigger and bigger compared with those of vertical load uniformly distributed along the axis. With increase of rise-span ratio, the buckling loads of hingeless and two-hinged arch increase after decrease, then decrease. The buckling load of three-hinged arch decreases after increases. When rise-span ratio is small, support condition has a great influence on out-of-plane buckling. The parabolic arch is better than circular arch in out-of-plane stability and economy. But circular arch is better than parabolic arch in manufacture.

Abstract: Fire safety is one of the most important performances index to evaluate building structures. The property of building members after exposure to fire involved with the safety of buildings after fire, and it will be necessary to estimate the post-fire residual strength of the structure in order to decide the appropriate strategy for repair. This paper summarizes the research progress of concrete-filled steel tubular (CFST) columns. Basic mechanical properties of conventional CFST columns after exposure to fire, CFST columns after the whole fire exposure process under sustained axial load, and CFST columns with special forms after exposure to fire are discussed.

Abstract: Compressive strengths of full-grouted dry-stack concrete block masonry were tested. Contribution of block and grouted concrete in carrying capacity of the masonry were analyzed through compressive strength data of 18 specimens. Related masonry capacity formulas were recommended accordingly.

Abstract: Increasing the beam cross section is a kind of traditional and universal strengthening methods of civil structure. The mechanical performance test were studied on the mechanics performance and deformation of four reinforced concrete beams in this study. The results show that increase of the cross section and tensile area at the bottom of the steel could effectively improve the performance of mechanical. The beam crack load, yield load, ultimate load and bending strength are increasing with cross section and mechanical. By simulating the relationship bwteen load and deflection. It is concluded that The finite element simulation of reinforced concrete beam with the reasonable concrete unit and reinforced unit can meet the demand of practical engineering.