Isolation Performance Analysis Of RC Structure With Specical Shaped Columns Considering Soil-Structure Interaction

Shaped column frame structure has a wide range of applications, but on the mechanical properties of the cross-sectional shape of irregular shaped column member, the configuration of the longitudinal reinforcement asymmetric isolation products used in order to improve the seismic performance of special-shaped columns shaped column frame structurehigher value. The same time, the processing of the seismic design of structures foundation is still based on rigid assumptions, soil filtering and amplification of seismic waves can not be ignored; shaped column frame isolated structure considering soil-structure interaction, research the seismic performance of certain research value and practical significance.Firstly, analysis of research on the seismic performance of special-shaped column members;12shaped reinforced concrete columns under low cyclic loads seismic performance simulation study, the L-shaped cross-section, the T-shaped cross-section and the cross-sectional shaped columns and consider the axis pressure ratio, column limb size, stirrup ratio and reinforcement section of the seismic performance of various components. The study found that the axial compression ratio of component failure form shaped columns, cracks appear and ductility greater impact. Appeared later shaped columns of large axial compression, the cracks in the specimen, but the specimen deformation is smaller than suddenly, destruction, component hysteresis curve surrounded by smaller, less energy dissipation capacity; When the column axis pressure comparison hour load value of the column cracks, Deformation has better ductility than full hysteresis curve of the column, good ductility and energy dissipation capacity, better seismic performance. Stirrup for concrete and the cross-sectional size of the increase can improve the ductility. Inequiaxial three reinforced concrete shaped column frame node Experimental study of the seismic performance analysis node ductility, energy dissipation capacity, stiffness degradation of performance; found stirrup shaped columns node in the node cracking force The small node cracking stress growth faster, bear the brunt of the shear sudden destruction, in order to avoid node node stirrup should not be too small. Stirrup shaped columns two column limb in the process of node force stress changes.In order to improve the seismic performance of the shaped column frame structure, the isolated components suction energy consumption can lead rubber bearings based mechanism; lead rubber bearing damping force, energy dissipation, but experimental studies have shownwithstand greater horizontal displacement load, lead core material because of its plastic properties is difficult to restore the status quo ante, so consider on the basis of lead rubber bearing composite shape memory alloy (shape memory alloy, or SMA), according to the experimentalstudies super-elastic shape memory alloy mechanical properties, proved by theoretical analysis of the shape memory alloy composite lead rubber bearings can increase the resilience of ordinary bearing, improve the energy dissipation capacity of the bearing, thus ensuring the rubber bearingthere is a greater shear deformation will still be able to return to its original position, to achieve better isolation effect.Finally, through the establishment of the reinforced concrete columns frame isolated structure model to study the shape memory alloy composite lead rubber bearings for seismic performance, focusing on considering soil-structure interaction damping performance of the bearing and its protective effect; through the analysis of the the buildings layer between the displacement, acceleration, speed time history curve, the maximum relative displacement of the comparative analysis of the building and the maximum absolute displacement found: high-frequency part of the seismic waves is double protection device isolation layer and the soil to filter out foundation soil, especially media as seismic waves, high frequency filtering effect can not be ignored. Also illustrates the rigid foundation under the conditions of the buildings in mining area of the earthquake response analysis, with considering soil-structure interaction, seismic response of buildings in mining area is somewhat different:the increased presence of subsoil structure absolute displacement assumptions rigid foundation conditions, regardless of the soil-structure interaction and mining seismic design of buildings in mining area safer and conservative.