| Special-shaped column structure with short-leg shear wall system is a more innovative new system,it is between shaped frame-shaped column and frame shear wall structure,and a combination between the structural system.On the one hand,the shorter it is more flexible arrangement of the wall shear,and reduce the structural stiffness and weight,thus reducing the seismic force;the other hand,it inherits many advantages shaped column frame structure,to a certain extent,its breakthrough in height restrictions.Most previous studies at home and abroad is the shear walls or special-shaped column structure of separate discussion in the context of their research and experiments.China's existing research focused on special-shaped columns,but also the research on the profiled column focused on the normal section of the bearing capacity.Oblique section of the bearing capacity formula is currently based mainly on limited test results,obtained by mathematical regression analysis,this situation can not satisfy the urgent needs of engineering seismic analysis.In this paper, the popular finite element software ANSYS, shaped frame-shear wall structure system of seismic waves of Tianjin (7),the bearing capacity, ductility and seismic performance, were studied by model calculations to analyze the characteristics of the structural system.The main research work and conclusions are summarized as follow::(1)First, we use ANSYS software to establish the elements of three different shaped column limb generous than the (3,3.5,4) in the shaped frame-shear wall structure system model,and the thickness ratio of three different limb model casemonotonic loading were simulated load test, cyclic loading loading test,and the earthquake simulation tests under earthquake loading,the corresponding analysis and calculation,the initial draw of the three specimens under different loading systemforce-displacement state,carrying capacity,failure status,seismic performance.(2)According shaped frame-shear wall structure of the stress contour maps,we can conclude that,in the structure,with beams shaped column associated with the site,even with the short leg walls and beams join the upper and lower parts of the underside,and the bottom of the shaped column,will appear larger stress concentration.With the limb thickness ratio increases,the ductility of the structure has not significantly improved with or significantly lower,indicating that shaped column of thick limb than in the (3 ~ 4),within the scope of changes in limb thickness ratio on the structural ductility limited impact.(3)Second, the results of the ANSYS model theoretical analysis,seismic cyclic loading,the coupling beam ductility is very good,significant numbers of plastic hinges can absorb a large amount of seismic energy.With limbs shaped column thickness ratio increases,the stiffness has been increased,making the structure of the vibration frequency increases,and increases linearly increases with the increase of limb effect of thickness ratio downward trend.Which can be drawn, limbs thick structural strength than small reserves are small,poor security;limb thickness ratio is not fully material properties,the economy is poor. After comparison,look at the comprehensive performance from the structure shaped columns limb thickness ratio of about 3.5 overall better shaped column frame structure,materials can give full play to its performance. |
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