Impact Performance Study Of Tubular T-joints With Local Thickening Subjected To Axial Loadings

The steel tubular structures have a wide application in engineering constructions because of the advantages of high-strength and light-weight. With the engineering accidents on the structures caused by impact of vehicles, vessels and other dynamic loads, the research on dynamic resistance of tubular structures has caught the attention of international and domestic academics. Tubular joints tend to have remarkable deformation when the members under impact loading, which may cause collapse of entire structure. The members of tubular structures subjected to axial load in service will reduce the impact resistance of the structure. Therefore, the studies on impact resistance of tubular structures under axial load have great engineering significance.This research which aims to research on the impact resistance of tubular T-joint with/without axial load and axially preloaded tubular T-joint with/without thickened on the joint zone under lateral impact loading. The following work has been studied:(1) Experimental test of tubular T-joint with different axial compression ratio and reinforced T-joint with same axial compression ratio under lateral impact loading. Through the data analysis, failure modes, residual deformation,time history curve of impact load, time history curve of lateral displacement and energy consumption were researched. It can be concluded through comparative analysis that axial load have adverse influence on impact resistance of tubular T-joint, increasing the thickness or length of the reinforced joint zone is effective to improve the impact resistance of structure. Compared to two methods, increasing the thickness is much more effective.(2) Finite element software ABAQUS is used to establish Finite element(FE) models to make accordance with the test are. The simulated results are evaluated through comparison with experimental results on failure modes, time history of impact force curves, time history of deformation curves,which aims to verify the accuracy and reliability of the FE model based on the verification. The result is that FE models are acceptable for studying the mechanical behavior.(3) The local and global displacement is distinguished according to the semi-area axis method. It can be concluded local thickening reinforcement can improve the impact resistance of tubular T-joint(4) Thoughing the Finite Element(FE) models gain the impact capacity and deformation law about T-joint with/without reinforced by increasing the thickness of the chord though analyzing the parametric, axial compression ratio.