Advanced Materials Research Vols. 594-597

Abstract: There are several models proposed by researchers that try to explain the equivalent mechanical parameters Ex, Ey, Gxy for the honeycomb core, but every method has different assumptions about deformation in equivalent mechanical parameters, they are not built on the same model and have some problems. This paper presented a new equivalent Y model firstly which considers the axial deformation and obtained the conclusion that regular hexagon honeycomb core has the properties of isotropy. This research successfully resolves the problems which existed in other models. It is giving the theoretical base for the analysis of the honeycomb structure.

Abstract: Aiming at the different spans of 24m, 27m and 30m for the bulk grain storehouse, the mechanical calculations of the bent frame columns with different grain height of 4.5m, 5.0m and 5.5m were respectively performed. The results showed that the reinforcement of columns rises rapidly with the increasing of grain height，and the reinforcement has little variance with the increasing of span if the grain height keeps invariant. Those findings are helpful to the construction of provincial grain storehouse.

Abstract: Using ANSYS to carry out finite element analysis of joint of end floor beam and main longitudinal girder in certain compound platform, researching on stress distribution of the joint, and making detailed analysis according to the calculation result of node finite element, the paper finds out the reason for crack of the joint and presents the improved design which enhance the carrying ability of the structure. The calculation result can also provide reference for other similar problems with different section form.

Abstract: There are three levels in stability calculating for sway frame. The first level is the traditional effective length method. The second level is the effective length method considering interaction of columns in one story and the third level is the effective length method considering inter-story interaction. The traditional effective length method may lead to unsafe design. Using the concept of equivalent negative stiffness, story stiffness to negative stiffness ratio factor and story support factor were proposed. Through the story stiffness to negative stiffness ratio factor, the weak-story and the inter-story support relationship can be found. Then, a formula for calculating the elastic stability capacity of sway frame is proposed, by which the inter-column interaction and inter-story interaction can be considered, and the finite element buckling analysis for stability capacity can be avoided. Through the stability capacity, the column effective length can be calculated. The results show that this simple calculation method has good precision and accuracy, can be used for engineering design and theoretical calculations.

Abstract: Through the vertical static load test of pile, studied and demonstrated the applicability of cast-in-place piles in the construction of a thermal power plant’s in Guangxi Zhuang Autonomous Region, china. By testing the internal force of pile shaft, obtained the distribution of axial force, side friction and tip resistance, and ascertained the vertical bearing capacity of punched cast-in-place piles in the engineering geological conditions of this project. This research provides the important quality control standards and design basis for the follow-up pile foundation construction of large area of this project, and also provides reference for other projects in this area.

Abstract: The U-section steel-encased concrete composite beams, a new type of composite beams with reasonable and efficient form, are developed from the common steel-concrete composite beams. In this paper, the U-section steel-encased concrete composite beams and common H-section steel composite beams were modelled numerically and analyzed contrastively from the same section height and reasonable cross-section two aspects using the finite element method (FEM) and the better mechanical behavior and economic performance of the new-type steel-encased concrete composite beams are summed up.

Abstract: It is a direction of blasting demolition for achieving the safe demolition of large-scale steel structures to use the technology of linear shaped charge cutter, which has been applied practically abroad[1], while is still at a initial stage in China. In this paper, the example of the blasting demolition of Shenyang Lvdao All-steel Structure Gymnasium is applied, which includes the technology of linear shaped charge cutter and electronic detonator initiating system and five 3-D protective measures. The result of this engineering is quite ideal in the end.

Abstract: Based on the reinforced mixing pile soil interaction mechanism, the effect of the reinforced mixing pile bearing capacity factors are analyzed; and on the basis of experiment and theoretical analysis the results of reinforced mixing pile with core rate optimal optimum core pile length and ratio; in the analysis of experimental data based on the present, on single pile the bearing capacity calculation formula and puts forward some suggestions.

Abstract: With the large-scale continuous development of economic, mass concrete structure plays an important role in the architecture construction field. This paper simulates the mechanism of temperature crack which is caused by temperature stress due to the change of temperature, introduces the generative principle of temperature crack simply and could provide references for control the temperature crack effectively.

Abstract: The steel industry has developed rapidly in recent years. At the same time,steel structure residence also rises gradually.Buckling is the main disadvantage of steel structures,so the strength of steel can't be fully utilized. Steel-timber combined member has both excellent mechanical properties and nice decoration effect, and can be well applied in steel residential building.