| In this thesis, the three types of steel beam-column connections, that is, thenon-scallop connection, the115mm width of expanded scallop connection and thegeneral connection are researched. Firstly, the distribution on temperature and residualstress of the three types of connections were obtained through ABAQUS which cancall the self-made subroutines DFLUX; Secondly, based on the above residual stressfield, mechanical performance parameters of the three connections under low-cyclecyclic loading were obtained; Finally, the quasi-static experiments were performed,which were compared with the results of finite element analysis. The purpose of thestudy is to confirm a new numerical simulation method, which can be appliedefficiently and rationally to the analysis of steel beam-column connectionsperformance, furthermore to confirm the characteristics of steel beam-columnconnections with this method. The thesis will provide theoretical basis for thedevelopment of steel structure. The main research contents and results are as follows:（1）"Live-die unit" technology ofABAQUS software was adopted to simulate theheat transfer of non-scallop steel beam-column connections,115mm steelbeam-column connections with expanded scallop and the general steel beam-columnconnections. Ellipsoid movement was showed by calling the self-made subroutinesDFLUX, which can simulate the welding process and the producing of residual stress.The calculation results show that: the residual stress on the intersection of the beamflange and web were more prominent in the non-scallop steel beam-columnconnections; stress concentration were more often accrued in the root of expandedscallop steel beam-column connections; the residual stress on the intersection of thebeam flange and the terminal of the scallop in general steel beam-column connectionswere prominent. However, because of the scallop has certain cooling capacity, thewelding residual stress of the115mm steel beam-column connections with expandedscallop and the general steel beam-column connections are relatively small.（2）Based on the residual stress analysis, we carried out the quasi-static analysis of the above three connections, the main performance parameters of low-cyclereciprocating loads were obtained, and the comparison between experiment andanalysis was shown. The results show that: the bearing capacity and plasticdeformation capacity of non-scallop steel beam-column connections are better;however, the performance of115mm steel beam-column connections with expandedscallop is not satisfactory.（3）The quasi-static experiment of the three connections were carried out by usingMTS servo-hydraulic loading equipment. The results show that: energy-dissipationperformance of non-scallop steel beam-column connections are better, maximum loadand the plastic rotation are significantly higher than the other two connections; thearea of hysteretic curve of the115mm steel beam-column connections with expandedscallop is the smallest, and its various performance parameters is not satisfied. In thegeneral steel beam-column connections, the brittle fracture occured early, the crack onthe beam began from the terminal of the coincident point of flange and web, and itshysteretic curve shrinked. By means of comparison between the experiments and thefinite-element analysis of three connections, it can be concluded that the results ofquasi-static analysis based on residual stress analysis are more realistic, the dynamicwelding process can be better simulated with thermal-sequential coupling method. |
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