The Seismic Performance Analysis Of SRC Frame Structure

Steel reinforced concrete (SRC) is a combination of structural steel reinforced structure in reinforced concrete, with the characteristics of high capacity, good stability, good ductility and seismic performance, etc.. It has been widely used in high-rise,super-tall buildings and large span structures.So, the seismic performance analysis of SRC frame structure has higher engineering value.This paper established a 10-story steel reinforced concrete frame structure, to analyze the column-beam steel ratio and the number of SRC columns layers influence on seismic behavior of frame structure, the main work are as follows:(1) Established structures analysis models by using finite element analysis software SAP2000, through the structure modal analysis, researched the natural vibration period and vibration mode characteristics of the structure.Modal analysis provided modal information for pushover analysis. (2) Analyzed the response of structure under the effect of frequently occurred earthquake by using response spectrum analysis,and researched the stress and deformation of the structure. (3) Analyzed the response of structure under the effect of rarely occurred earthquake by using pushover analysis method,to study the development of plastic hinges, and used the capacity spectrum method to assess the overall deformation capacity and earthquake energy dissipation capacity of steel reinforced concrete frame structure.The main conclusions are as follows:(1) In the modal analysis, as the column-beam steel ratio increases and the increase in the number of layers of SRC column configuration, the vibration period of steel reinforced concrete frame structure decreases, the overall stiffness of the structure increases, the lower portion of the columns on the stiffness of the structure are relatively large, the upper portion of the columns on the stiffness are relatively small.(2) In the response spectrum analysis, under 8 degrees (0.2g) frequently occurred earthquake, as the column-beam steel ratio increases and the increase in the number of layers of SRC column configuration, the maximum story displacement and displacement between the layer decrease.(3) In the pushover analysis, as the column-beam steel ratio increases and the increase in the number of layers of SRC column configuration, the base shears at the performance points increase and the structures ability to resist earthquakes increases. The maximum story displacement and displacement between the layer decrease. The parameters of the model nine and the model eight are close, so the impact of the lower portion of the columns on the seismic behavior of steel reinforced concrete frame structure are large, the upper portion of the columns are not reinforcing structure.(4) The maximum story drift of each model did not exceed the specified limits of’Seismic Design of Buildings" (GB50011-2010), so the structure can withstand 8 degrees (0.2g) frequently occurred earthquake and rarely occurred earthquake. The three and four layers are weak layers,so they should be strengthened in the actual project.(5) Ordinary concrete frame and steel reinforced concrete frame structures entered into the inelastic phase under rare earthquake, the plastic hinge of each model developed more fully, the plastic hinge occurs in the cross section,and it also appears at the bottom of the column in the ordinary concrete frames, but it does not appear in the column of steel reinforced concrete frame structure, plastic hinge development from the beam to column,so it is in line with the "strong column-weak beam" requirements for seismic resistance.(6) From the overall considerations of the structures seismic performance,the overall deformation capacity and earthquake energy dissipation capacity of steel reinforced concrete frame structure are good. In the actual project, it is proposed to meet the seismic requirements, SRC columns are arranged in the range of 1/3 or more storey.Through SRC members and ordinary concrete elements appropriate ratio to keep balance of applicability and economic.