Seismic Performance Analysis Of Steel Frame With Semi-rigid Connections

With the vigorous development of China's steel housing industry,the application of high-rise steel frame structure more and more.Steel is currently in the design process,engineers are generally designed as beam-column joints so-called "just the node",although this idealized assumptions can greatly simplify the design,process analysis,but will cause a huge theoretical and practical difference.Because whether it is just ideal node or a hinge point did not exist,all the connections between all forms of rigidity over rigid connection and fully articulated.In addition,because of the lack of the necessary basis for China's current steel specification for semi-rigid node connectivity only qualitatively provisions,there is no quantitative standards.Rapid social and economic development,multi-level space steel frame has been widely used.Study on seismic behavior of semi-rigid steel frame has become one of the key research topics of engineering,research and application prospects are very broad,relevant for the development of national standards,to guide the engineering and earthquake disaster prevention and mitigation work to provide some reference.For the above situation,this paper studies the following aspects:(1)On Semi-rigid nodes moment rotation curve fitting method proposed finite element model of a new semi-rigid analog nodes,namely a two-chain hinge rod structure,through the establishment of model fitting existing node test node curved semi-rigid moments way rotation curve to establish its feasibility.(2)to apply the new model to simulate a node Pin frame under low cyclic loading static test,analyze its ductility,energy dissipation capacity,carrying capacity and hysteretic performance and other aspects.And the calculation results and the actual test results were analyzed to verify the reliability of the simulation model,and with the same material parameters rigid frame in the case of the same system of loading conditions for the performance of the resulting resistance in comparison to find static tests semi-rigid joints play features.(3)through the vibration characteristics of structural analysis modal analysis,analysis of rigid node structure for natural frequency impact.Select the appropriate seismic waves on the framework to do time-history analysis,comparative analysis under different conditions ofseismic waves and seismic performance difference rigid frame semi-rigid frame to obtain the seismic characteristics of dynamic analysis of semi-rigid frame.Modeling indicates:whether in the semi-rigid frame under cyclic loading or under seismic loads have good seismic behavior and energy dissipation capacity.