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Numerical Analysis of Seismic Performance of Fully Bolted Prefabricated CFSST Column Connection Joints
LIN Xiaojun, ZHANG Ailin, ZHANG Yanxia, SHEN Sen
PDF(5109 KB)
PDF(5109 KB)
Numerical Analysis of Seismic Performance of Fully Bolted Prefabricated CFSST Column Connection Joints
In order to solve the problems of serious pollution and low construction efficiency caused by on-site welding of concrete-filled steel tubular column-column connection joints， and to integrate the advantages of cross-shaped core tubes for convenient processing and construction， a new type of connection joint is proposed. This joint is a fully bolted assembly connection joint with built-in cross-shaped core tube for concrete-filled square steel tubular （CFSST） columns， based on the self-tapping bolt and core tube column joint proposed by the research group. Based on the proposed static test results of this connection joint， a numerical analysis model is established using ABAQUS software to verify the reliability of the simulation method， and a parametric analysis is carried out for the different combinations of self-tapping bolts， stiffening ribs and cross-shaped core tube. The results show that the numerical analysis results are in good agreement with the test results， which verifies the reliability of the numerical analysis method. The self-tapping bolts effectively inhibit the buckling deformation and relative opening of the flange plate， which increases the joint bending capacity by 19.94% on average， and slows down the stiffness degradation of the joint. The stiffening ribs inhibit the deformation of the flange plate， which increases the joint bending capacity by 3.70% on average， but increases the possibility of relative opening. The cross-shaped core tubes effectively inhibit the buckling deformation of the flange plate and the local buckling of the column wall， increasing the bearing capacity and stiffness， and delaying the stiffness degradation of the joint. Overall， the stiffening ribs have little effect on the bending capacity of the joint， and increase the relative openings of the upper and lower flange plates. Therefore， the fully bolted assembly joint for CFSST columns can be optimized as a combination of core tube and self-tapping bolts， and the cross-shaped core tube， self-tapping bolts and concrete have a good mechanism of synergy. Both the joints before and after the optimization can achieve the performance design goal of "strong joints， weak members"， which are recommended in the engineering application.
cross-shaped core tube / concrete-filled square steel tubular （CFSST） column / self-tapping bolt / seismic performance / numerical analysis
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