Experimental study on seismic behavior of mid-rise RC shear wall with concealed truss

In this paper,mid-rise shear wall with concealed truss was proposed.This new composite shear wall includes two kinds of composition:one is the composition of two bearing systems,including truss and shear wall,and the other is the composition of two materials,including steel and concrete.Therefore,it is a double composite shear wall.The experimental study on the seismic behavior of six 1/3 scale mid-rise shear walls,including an ordinary mid-rise shear wall,a mid-rise shear wall with steel frame,and four mid-rise shear wall with concealed truss made of different materials,was studied.Based on the experimental study,the stiffness and its attenuation,bearing capacity,ductility,hysteretic property,energy dissipation,and failure phenomena of each shear wall were contrastively analyzed.The formulas of bearing capacity and stiffness were established.The results obtained from the formulas and those from experiment are in good agreement.Some suggestions for seismic design of shear wall are given in this paper.The experimental results show that the seismic behavior of the mid-rise shear wall with steel frame and that of every truss with different materials is obviously improved.

Research on seismic performance of shear walls with concrete filled steel tube columns and concealed steel trusses

In order to further improve the seismic performance of RC shear walls, a new composite shear wall with concrete filled steel tube （CFT） columns and concealed steel trusses is proposed. This new shear wall is a double composite shear wall; the first composite being the use of three different force systems, CFT, steel truss and shear wall, and the second the use of two different materials, steel and concrete. Three 1/5 scaled experimental specimens： a traditional RC shear wall, a shear wall with CFT columns, and a shear wall with CFT columns and concealed steel trusses, were tested under cyclic loading and the seismic performance indices of the shear walls were comparatively analyzed. Based on the data from these experiments, a thorough elastic-plastic finite element analysis and parametric analysis of the new shear walls were carried out using ABAQUS software. The finite element results of deformation, stress distribution, and the evolution of cracks in each phase were compared with the experimental results and showed good agreement. A mechanical model was also established for calculating the load-carrying capacity of the new composite shear walls. The results show that this new type of shear wall has improved seismic performance over the other two types of shear wails tested.