| In this thesis, the all-welded steel beam-column connections with expandedscallop and non-scallop proposed respectively by the internal academician andJapanese academician are researched. On the one hand, the reasonable size choice forexpanded scallop is made through the experiment and ABAQUS finite elementanalysis; on the other hand, through the experiment and finite element analysis, theanalysis results of the expanded scallop model and non-scallop model are compared todefine the earthquake resistant capability of them. This is to provide theory evidencefor the research of new type steel beam-column connection of China, and they can befor reference of engineering design of steel structure. Therefore, the study has realisticscientific significance.The main contents and results of the study are as follows:(1) The steel beam-column connection with the 115 millimeters width expandedscallop proposed by forerunner is researched through experiment. Based on the size ofscallop in literature 6, choosing lower beam depth, the earthquake resistant capabilityof connections is researched through the experiment by the electro-hydraulicservo-machine. The experiment results of expanded scallop and traditional scallop arecompared, then it is found that the expanded scallop size weakens the section of beammore for the lower depth of beam, and the connection mechanical property isinfluenced.(2) The pseudo-static experiment under the influence of welding heat effect forexpanded scallop connections is simulated by ABAQUS finite element software, andthe different sizes of expanded scallop are considered here. The method of weldingthermal analysis is transient, and the initial temperature of model is set into 20℃. Forusing"Element Birth and Death", the sequential welding process is simulated. Theweld models are heated to 1500℃respectively, in the end, cooled to 20℃throughheat conduction, convection and heat radiation. On the basis of this, the results ofpseudo-static experiment simulation are compared for choosing the reasonable size ofexpanded scallop. (3) The result of the pseudo-static experiment of non-scallop is compared with theresults of finite element analysis. It is found that the carrying capacity and energyconsumption capacity of the non-scallop connection are better, which accords wellwith the results of finite element analysis. From the experiment phenomenon we cansee that cracking and other damage did not occur at the weld. So that non-scallopconnection can be finished in China's current level of steel processing technology.(4) The results of finite element analysis of expanded scallop connection andnon-scallop connection show that although welding thermal residual stress ofnon-scallop connection is easy to concentrate at the intersection of beam flange, beamweb and column flange because there is no scallop, from the stress condition we cansee that the maximum stress deviated from this dangerous position, however, localbuckling which is far away from the weld due to the overall instability damage; underthe influence of the temperature field, expanded scallop connection is easy to generatestress concentration at the root of the scallop, where the connection generates crackeasily; The carrying capacity and energy consumption capacity of the non-scallopconnection is better than expanded scallop connection, however they only have littledifference.Overall, the process methods of expanded scallop connection and non-scallopconnection are more complex than traditional connection, but both of them have theirown capacity advantage. It is not impossible to popularize them in China's currentlevel of steel processing technology. As new type connections, they are going to beresearched in depth. |
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