Research On Seismic Performance Of Multiple Concrete Filled Steel Tube Column-Shear Wall Composite Structure

Combining the research and development status of the column-shear wall composite structure and the multiple steel tube concrete,a new type of multiple steel tube concrete column-shear wall composite structure is proposed.Compared with the traditional column-shear wall composite structure,this new type of structure It can effectively improve the overall seismic performance of the structure.The PEC column is composed of H-shaped steel channels filled with concrete and transversely welded tie bars on the steel flanges.This study uses ABAQUS finite element software to complete the PEC column-shear wall composite structure,the single-layer concrete filled steel tube column-shear wall composite structure,the multiple concrete filled steel tube column-shear wall composite structure,and the hollow multiple concrete filled steel tube column-shear.The finite element calculation of the wall composite structure and the comparative analysis of its seismic performance are carried out.The specific content is as follows:1.Use ABAQUS to establish a PEC column-shear wall composite structure model consistent with the experimental conditions and complete the finite element calculation and analysis.The calculation results are compared with the experimental results in terms of structural failure form,hysteresis curve and skeleton curve.The results show that the two are in good agreement,thus verifying the accuracy of the built model.On this basis,Single-layer concrete filled steel tube column-shear wall composite structure and two types of composite steel tube concrete column-shear wall composite structure models were established through equivalent replacement of columns.2.Completion of the finite element calculation and analysis of the four structures under single load.The results show that the load-bearing capacity of the single-layer concrete filled steel tube column-shear wall composite structure is higher than that of the PEC column-shear wall composite structure,thus verifying the use of single-layer concrete filled steel tube Columns instead of PEC columns can effectively improve the overall bearing capacity of the column-shear wall composite structure.The column-shear wall combined structure with multiple concrete filled steel tube columns,due to the better interaction between steel pipe and concrete,makes the overall load-bearing capacity of the structure higher than the single-layer concrete filled steel tube column-shear wall combined structure,and the hollow multiple concrete filled steel tube.Among them,the shear wall composite structure has the highest bearing capacity.3.Complete the finite element calculations for the four structures under low-cycle cyclic loads,and compare and analyze the hysteresis curve,energy dissipation capacity,skeleton curve,ultimate bearing capacity,strength degradation and stiffness degradation and other seismic indicators.The results show that the two multiple concrete filled steel tube column-shear wall composite structures have better energy dissipation capacity,higher ultimate bearing capacity,and slower strength degradation and stiffness degradation.Comprehensive analysis shows that the seismic performance of the hollow multiple concrete filled steel tube column-shear wall composite structure is better than that of the solid multiple concrete filled steel tube column-shear wall composite structure,and it has advantages in reducing the weight of the structure.Therefore,the structure should be given priority in actual engineering.4.Calculated and compared and analyzed the influence of different concrete strength and steel tube wall thickness on the seismic performance of two multiple concrete filled steel tube column-shear wall composite structures.The results show that the changes of these two parameters can improve the seismic index of the composite structure with multiple concrete-filled steel tube column and shear wall to a certain extent.The increase in the wall thickness of the column steel pipe is more obvious,while the increase in the strength of the concrete is less.Therefore,in actual engineering,the method of increasing the wall thickness of the column steel pipe can be preferred to improve the seismic performance of the structure.5.The electrical properties of the nano-material titanium disulfide are calculated,and the results show that it can be used as a resistive sensor material to monitor the deformation and failure of the structure.Combined with the analysis of the mechanism of stress damage,the sensor is rationally arranged in the structure.