Research On Considering Stressed Skin's Effect On The Mechanical Properties Of Light Gauge Steel Structure

In light steel structure, if proper connections are made between profiled steel sheet and steel members, the sheet can resist shear force in their plane, the shear behavior is named stressed skin diaphragm.Light steel structure in the pressure plate in the objective to participate in the overall force structure, in order to frame a part of components outside the load-sharing. At the same time, these components provide good side constraints, improve the structure of state power. If full account of the structural design of the pressure plate skin effect, can bring about significant economic benefits. Engineering design in our country there is such a misunderstanding: Skin effect of the stress that tends to ignore conservative, do not consider the effect of stress skin structure is biased safe. However, regardless of whether the design of the pressure plate skin effect, skin effect is the objective existence of the large number of actual structures. Especially in the more high-level horizontal load bearing light steel structure, due to a high degree of a larger structure there is a large lateral displacement, even in the normal work load, the buckling of roof damage are even possible. Consider the skin effect and the design method not only has economic significance and, more importantly, enables the design of the structure of the state and the actual work of a more coherent state. Therefore, the skin effect of light steel structure to carry out systematic research has important theoretical and engineering application value.Although a lot of research and experiments on the performance of stressed skin have been carried out in the western countries and China, but the past research work was mostly focused on skin diaphragms, especially on the connection between clad shells or clad shells and their sustaining bars, while there was hardly any research and experiment on the buildings with clad structure as a whole. On the basis of the research results, use the finite element analysis software"SAP2000"and the finite element method for geometric nonlinear analysis of diaphragm structure under static loading is presented in this paper by finite-element software. By comparing the result of analysis of the models it finds the contributions of skin to buildings, such as the distribution law of internal force and the situation of deformation.The research results of stressed skin diaphragm are summarized in this paper, and based on the research results, finite element models of wall structure are set up in this paper, the results have good agreements with the experiments, so we can analyze the structure with this method.so two global structures about stressed skin diaphragm structure and common structure are set up and global performance of them is analysed respectively, by comparing the results of analysis of the models, it finds that the stressed skin diaphragm improves the stiffness of whole struture obviously, improves the load-bearing capacity and reduces the deformation of structure. In addition, through simulation analysis on sheeting structure, it finds that the distribution law of stress and it makes us know the state of practical mechanical behaviors and deformation of structure.The results of the analysis and research, the following conclusions can be drawn:Consider the skin effect of the stress suffered by the structure of the level of stress load than the skin effect is not considered to raise greatly the structure of its capitals significantly reduced the level of displacement, Gable of the stress due to skin effect, skin effect to consider the stress of the end of the structure of the framework of the central framework of capitals capitals than displacement reduced the extent of displacement;Consider the effect of stress skin structural changes in the housing by the force of the axial force rod, shear and bending moment distribution, reduces the relative pole of the internal force;Horizontal load in the capitals, the gable boards skin is a major component of the commitment level of load, the cover plate over the stress skin roof and wall panels longitudinal stress values much larger, Gable stress skin panels in the vicinity of both ends of the framework of a larger inter-column skin plate stress is relatively small; Relatively high in the steel frame structure, the structural design of such a stroke of the lateral loads generated by the main load for the design considerations, The role of the skin envelope system to a large extent reduce the gable in the middle of the framework and the framework of the relative displacement between,If the design does not consider the skin effect of retaining the system and that all the load borne by the framework, the structure of skin panels often work load will yield even under the occurrence of damage, so take into account the structural design of the skin envelope system effect is very necessary and important.Parameter analysis is made about some influences in wall structure, such as thickness, the ratio of width to thickness, The results showed that: Increase in skin thickness to improve the overall stiffness of the structure, thereby enhancing the capacity of the structure of the anti-sway is effective structure to reduce the stress and internal forces to a certain extent, However, commonly used in engineering pressure range of plate thickness, the magnitude of this effect is not significant, therefore, should be based on the specific circumstances of the thickness of more economical choice. Light steel structure of a multi-layer skin and do not take into consideration when skin changes slenderness ratio of the comparative analysis, the following conclusions: In the structure of allowed range of slenderness ratio, due to the existence of skin plate, so that the structure of the increase in the slenderness ratio, the frame structure without skin compared to the smaller deformation structure on the frame structure with skin, slenderness ratio of the changes have little effect on the structural deformation. Column slenderness ratio is the impact of skin effect of the wall structure of the stress an important factor, Through the skin structure of the general structure and contrast can be seen that changing the general structure of slenderness ratio pillars can effectively improve the carrying capacity of the structure, change the structure of lateral displacement, so the framework for non-skin structure, and slenderness ratio of the components should be strict requirements and limits.In addition, the thickness of the panel, the b of the column and the section of the gable bracings are studied. Gable roof, only skin and skin when working together can we effectively play the role of skin, and the vertical wall of the structure of skin in the skin effect plays the role of small, Therefore, if multi-layer skin structure to meet the lighting and ventilation requirements, The need to create the hole, it is proposed to open the doors and windows opening in the vertical wall and a gable roof in order to ensure the normal functioning of skin effect.