Multi-section Fiber Model Research Of Prefabricated Shear Wall With Concrete Filled Steel Tube Columns

Prefabricated steel and concrete composite shear wall structure is a new type of structural system,there are a large number of nodes,horizontal joint,vertical joint,the joint force performance directly determine the overall performance of the structure.At present domestic related research focused on the experiment,design according to the existing standard “equal to cast-in-place”,usually does not consider “assembly” in numerical calculation,consistent with cast-in-place modeling methods.Multi-section fiber model of prefabricated structure,through the structural parameters such as cross section effective area reduces and the bond-slip,considering “assembly” factors to seismic behavior on structure,based on Open SEES computing platform and experimentation,check and confirm the model and parameters analysis,further broaden the scope of application and verify the rationality of the model.Selecting JGJ1-2014,JGJ1 GB50010-2010-91,DB11/1003-1003,DB23 / T-2010 and the United States,Europe and other foreign standards,combined with the examples,making a comparison about differences and similarities of horizontal joint bearing capacity on prefabricated concrete structure,the results show that calculation results of the standard exist differences,showing that in design method and numerical analysis,prefabricated concrete structure design method is verified with numerical analysis,considering joint exist,bond slip,and structural measures are necessary.Establishing multi-section fiber model of prefabricated reinforced concrete shear wall structure(Multi-section Fiber Model,namely MFM),combined with the experimental research on 5 pieces of precast concrete shear wall components,conducting the numerical analysis research,making a contrast about the experimental results and analysis result,validating the rationality of the model and the key parameters.To consider the factor of “assembly”,through the parameter study about bond-slip of reinforcement,shear effect and area of confined concrete,the results show that the parameters has less effect in the numerical analysis,it can be ignored.Based on the Open SEES,Establish multi-section fiber model of prefabricated shear wall with concrete filled steel tube column,based on the full scale experimental study and considering the effects of vertical seam,check and confirm the model of the key parameters,test results and the numerical results are in good agreement,verifying the rationality of model and key parameters.Through numerical analysis,the results showed that considering bond-slip of reinforcement,shear effect and area reduction of confined concrete and other parameters has less effect on prefabricated shear wall with concrete filled steel tube column,it can be ignored.