Elastic Time-history Analysis Of Steel Frames And Concrete Core-tube Hybrid Structure Involving Different Material Damping Ratio

The use of hybrid structural system, which is composed of steelframes and concrete core-tube, is becoming more and more extensive inmodern buildings with the increasing structure height. However, theaseismic behavior of the hybrid structure system has not beencomprehensively studied. Additionally, the damping ratio of steel andconcrete differ greatly from each other. In practical structural designs,effective damping ratio is often used, the value of this ratio varies fromthe two materials'damping ratio. It's a approximate way by usingeffective damping ratio, the results of this method are not precision. Thestudy of influence of different material damping ratio to hybrid structuresystem is not thorough, while that system is increasingly popular. It'ssure that there's some difference from the results of those two method.sometimes, those difference maybe a threat to structure's security orresident's safety.A three-dimensional model of steel frames and concrete core-tubestructure project is established by using SATWE, then the elastic timehistory analysis of that model is used under different earthquake function.In this paper, the previous model is selected in calculating thedifference of the two different damping models by using planar elasticdynamic time history analysis, that considering different materialdamping ratio and effective damping ratio. According to compare ofinternal force and displacement, the influence of damping ratio value tocalculating results estimated. thus, the precision and feasibility of usingeffective damping ratio can be tested. At last, suggestions of suitableeffective damping ratio of that structure is put forward.