Anti-seismic Analysis For Steel Reinforced Concrete Special-shaped Column Frame Structure

Steel reinforced concrete (SRC) special-shaped column frame structure is a new kind of structural system, which has high bearing capacity, excellent seismic performance, and simultaneously the advantages of normal special-shaped column structure. So far, researchers have only carried out lots of experimental studies and theoretical analysis on the joints of steel reinforced concrete special-shaped columns frame structure. But researches on the entire frame structure are not enough. Based on this, this paper investigated the influences of infill walls’layout and structural parameters (including concrete strength, axial compression ratio, stiffness ratio of beam to column) on the anti-seismic capacity of the steel reinforced concrete special-shaped column frame structure.Refering to the test models builded in Xi’an University of Architecture&Technology in2012,24models were set up in this paper by changing the infill walls’layout and the structural parameters (including concrete strength, axial compression ratio, stiffness ratio of beam to column) by SAP2000.Then modal analysis and dynamic elastic-plastic time-history analysis of the models were conducted, and the calculated results of each model were compared. Through this, conclusions were drawn as follows.(1) Optimization and reasonable addition of infill walls is beneficial to improving the stiffness and seismic performance of entire structure. On the contrary, unreasonable arrangement and addition of infill walls may lead to mutation in structural stiffness and induce adverse effects on seismic performance of structure.(2) With the increase of concrete strength, the natural vibration period of the structure decreases gradually and its period ratio increases. At the same time, earthquake response of the structure reduces gradually under the same horizontal earthquake.(3) With the increase of axial compression ratio, the natural vibration period and period ratio of the structure increase gradually, and the earthquake response enlarges under the same horizontal earthquake. (4) When the stiffness ratio of beam to column is between0.44-0.825, with the increment of stiffness ratio of beam to column, the natural vibration period and period ratio of the structure magnifies gradually, but the growth rate of period ratio is relatively small. Under the same horizontal earthquake, the earthquake response of the structure enlarges gradually when the stiffness ratio increases from0.44to0.605, and reduces gradually when the stiffness ratio increases from0.66to0.825.42pictures,19tables,61references.