Experimental Study On Seismic Performence Of Inner Steel Plate- High-strength Concrete Medium-high Composite Shear Walls

With the highly development of city construction, high-rise buildings in our country has made great and rapid progress. Construction features and types have been updated and changed, the difficulty of structure design are also increasing gradually. With the continuous increase of building height, the use of high strength concrete has become a trend. However, poor ductility of high-strength concrete, brittle failure, such as faults, make its use is restricted. As the advantages of high bearing capacity and good energy dissipation performance,steel plate shear wall begin to be studied and applied to a lot of tall and super high-rise buildings since the 1970 s. But in the Midwest economically underdeveloped areas of our country, especially for the seismic fortification intensity of 8 or more regions, the building height of which is not particularly high. Under seismic action produces bending moment is smaller,The Excessive shear wall stiffness will cause excessive horizontal force under the action of earthquake occurred to the brittle failure. Therefore, it is the vital significance that improving the performance of the shear wall, which is effectively to reduce the stiffness of shear wall and Limit the formation of shear wall crack. Meanwhile, this method is able to ensure the ductility of the steel and concrete composite shear wall structure, improving the energy dissipation capacity, so as to achieve the aim of maximal economic applicability has the vital significance. The article adopts the research method of the test and analysis, the research are as follows:The author did tests of four steel plate reinforced concrete shear walls(SPRCW), with a shear-span ratio of 1.8, which had the same edge steel and cold-formed steel,and different location or different steel ratio of steel plate. Then the seismic behavior of SPRCW, which had the different steel ratio and different location in the shear walls, was discussed. On basis of these trials, the main work and achievements of this paper are as follows:(1)The experiment adopts low cycle reversed horizontal load under the action of quasi static test. The axial compression ratio is set in 0.40 to Get Connection on both sides of high strength concrete and high failure pattern and failure mechanism of composite shear wall, which is under the condition of different position and different content of steel.(2)The test specimen will be around the steel ring of shear that is composited with high strength concrete. This practice is intended to give full play to the advantages of two kinds of materials, ensuring the two materials together. Finally, the author analyzes and sums up the built-in steel plate with high strength concrete composite shear walls seismic performance of the specimens.(3) Test specimens’ law of Shear deformation and bending deformation, and its percentage in total deformation will be studied and comparatively analyzed.(4) This paper will Analyses the distribution regularity of stress and strain about built-in steel plate and Inner Cold-formed Steel.(5)Test specimens’ law of hysteresis curves, skeleton curves, ductility, energy dissipation capacity, strength attenuation will be studied and comparatively analyzed.(6) This paper will establish the mechanical models of elastic stiffness, by comparing the calculated values with the experimental results, thus made a preliminary study on built-in steel plate reinforced concrete shear walls;(7) This paper will establish the mechanical models of bearing capacity,comparatively analyzed the calculated values with the experimental results and obtained the computational formula of flexural bearing capacity of shear wall, thus made a preliminary study of deformation capacity of cold-formed built-in steel plate reinforced concrete shear walls.The experimental results show that, the built-in steel plate reinforced concrete shear wall is able to provide effective lateral restraint to restrict steel plate concrete outside the surface buckling, and improve the bearing capacity of composite wall body and energy dissipation capacity. Therefore, the types of concealed bracings given by this paper provide a reference to engineering design.