| In recent years, portal frame structures are widely used for industrial and civil buildings. At the same time, tapered members which have appropriate section properties are widely used in that kind of structures. The stability study on tapered members in portal frame structure is very important for appropriate structural design and promote the development of light steel structure because it with lightweight design, fast construction speed and high cost-effective advantages. Therefore, the relevant research on interactive bucking performance and stability of tapered member has become the focus of attention for many scholars.In this thesis, the effect on in-plane stability bearing capacity of 12 tapering members with different tapering rate and eccentricity was analyzed and studied through the static loading test. Test results show that tapering rate is an important parameter to the in-plane stability carrying capacity; the stability bearing capacity of components increases with the increase of the tapering ration and the stability bearing capacity reduce with the increase of eccentricity. The stress procedure of the tapering elements was simulated and analyzed according to ABAQUS software. The analogue results and experiment results are coincident.In the thesis, parametric analysis of the member is carried out and finite member results of in-plane stability load-carrying will be obtained by changing parameters, including web plate width-thickness ratio, flange with-thickness ratio, tapering ratio and slenderness ratio of member etc. The influence of these parameters to the in-plane stability carrying capacity is researched. The results are compared with those of current Chinese Technical Specification for Steel Structure of Light-weight Buildings with Portal Frames (CECS102:2002). The results show that the later is safer.Influence of parametric to in-plane stability bearing capacity can be analyzed through the method of combining finite member with test.
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