| Shear wall is the main component that resists the lateral force for high-rise buildings. With the rapid development of high-rise buildings, especially the super high-rise buildings, research on new composite shear wall has become urgently needed for engineering. Based on previous study of our group about shear wall with concrete filled square steel tube columns, the shear wall with concrete filled round steel tube columns and concealed steel trusses has been brought forward in this paper. This new shear wall is a kind of multiple composite shear wall. It make the combination of the three lateral force resisting systems which are steel tube, concrete shear wall and steel truss, and the combination of two materials which are steel and concrete possible. And it also reflects the advantages of different lateral force resisting systems and different materials fully, and formed multi-channel seismic line. Seismic experimental research and theoretical analysis have been presented in this paper. Main contributions are listed as follows:1. Composite shear wall with concrete filled round steel tube columns and concealed steel trusses was proposed. The experimental study on the seismic behavior of eleven 1/5 scaled shear wall specimens with different shear span ratios (1.0, 1.5, 2.0) has been done under the cyclic loading action. The load-carrying capacity, ductility, stiffness and its attenuation process, hysteretic behavior, energy dissipation and failure phenomena of each specimen were discussed systematically. And their seismic mechanism was revealed.2. Six 1/12 scaled shear wall specimens with different aspect ratios (1.5, 3.0) have been tested on the shaking table. The acceleration response, displacement response, strain responses of each specimen are discussed systematically. And the damage evolution process of different constructional shear walls under earthquake was summarized.3. The simplified mechanics model of load-carrying capacity and restoring force model of shear wall with concrete filled round steel tube columns and concealed steel trusses have been established. The finite element analysis theoretical models have also been developed. The calculated results are in good agreement with those from experiments. Based on the theoretical analysis of shear wall with concrete filled round steel tube columns and concealed steel trusses, the variation mechanism of force to deformation was revealed.4. The seismic design method of Shear wall with concrete filled round steel tube columns and concealed steel trusses have been presented, which include applied scope, general rules, the layout principles and construction measures. Main considerations are concluded as follows:(1) Shear wall with concrete filled round steel tube columns and concealed steel trusses have multi-channel seismic lines and good seismic yielding mechanism. The load-carrying capacity, ductility are obviously increased compare to normal shear wall.(2) The steel trusses embedded in the shear wall with concrete filled round steel tube columns and concealed steel trusses effectively control the emergence and development of inclined cracks in the wall, and accordingly increase the later stiffness of the wall.(3) Shear wall with concrete filled round steel tube columns and concealed steel trusses has good hysteretic performance and high seismic energy dissipation capacity.(4) The displacement responses of shear wall with concrete filled round steel tube columns and concealed steel trusses is smaller under dynamic load, the shear wall exhibits the strong ability of anti-seismic collapse.
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