Research Of The Seismic Behavior Of The Steel Structure Residence Braced Framework And Optimal Placement Of The Braces

In recent years,Domestic steel production surplus has become a serious problem.Steel price has been declining.And with the rising awareness of environmental protection and energy conservation,fabricated steel housing can be accepted and welcomed by people,with its green and environmentally-friendly features,feasible industrialization of residential,seismic superior performance and shorter construction time,etc.Governments and relevant construction departments has attached great importance to the promotion of steel housing.This paper selects the steel commonly used in housing structure type-supporting framework for the study and has specifically completed the following work:1.According to the actual steel residential construction program,the steel frames without the support of the general arrangement,braced frames,eccentrically braced steel frame,BRB and other four structural systems have been designed.And the results of the design in seismic response to the parameters of small earthquakes have been comparatively analyzed.The results show that,in the stage of the elastic deformation stage,seismic performance of three kinds of support frame are basically the same,which is better than ordinary steel frame structure without arrangement2.Perform-3D software used the above four structural system for the pushover analysis,compared the four key structural metrics in pushover analysis--the ability curve,performance points,the reference displacement,the degree of components' damage,.The results showed that: four structural capacity curve becomes weaker from BRB,eccentrically braced,braced,steel frame.Since that the general support compression is prone to be buckled results that the overall stiffness of the structure is easily mutated in a pushover analysis.3.Landers,Livermore,Rg(artificial wave)are used to analyze the dynamic time history of the construction under the rare Earthquake's power.Taking inter story drift structure,floor shear,vertex displacement,energy curve,the ratio of energy consumption member,hysteresis curve parameters as index.The seismic performance of the above four structures(and the introduction of low yield point of the core material(LY160)of BRB)are taken a comparative analysis,which gives us the difference between failure modes and seismic performance of the four structural systems under earthquake.The four structural systems' seismic performance are evaluated comparatively from structural dynamic response and energy dissipation.4.Based on the above conclusions,lateral stiffness ratio is taken as control principle.And the original structure is optimized with BRB frame.The mixed support arrangement(center s upport and BRB)is studied.The concept of replacement rate of center support is carried out.Pushover analysis and time history analysis method are used to compare the seismic performa nce of the structure with the replacement rates of 0%,25%,35%,45%,and 55%,Considerin g the seismic performance and economic factors,the optimal replacement rate of BRB in mix ed support steel frame structure is obtained.And the influences to the structure,when K(BRB and lateral stiffness ratio)is fixed and varied,are compared,which can provide reference to t he design.