高強度超大截面熱軋與鍍鋅等邊角鋼構(gòu)件殘余應(yīng)力和穩(wěn)定性研究
[Abstract]:High strength steel structures have more and more applications in practical projects at home and abroad. The construction industry has been applied to 690 MPA and above strength steel, and the transmission tower industry in China has started to use 420 MPA and above strength steel in recent years. It has been shown that the single angle steel with high strength and large section can completely replace the combination of common angle steel and circular steel pipe in the transmission tower project, and the high strength and large section single angle steel tower has the advantages of clear transmission path and uniform force. At the same time, the artificial error and the engineering cost are reduced, but at present there is no systematic research on the performance of this kind of angle steel, and the design method of the axial compression member of the angle steel is still lack of sufficient research basis. In order to obtain a systematic performance study of this new type of angle steel, Q420 high strength steel L300X30 hot rolled and galvanized equilateral angle steel is selected as the object of study in this paper. In this paper, the research progress of residual stress is introduced systematically, and then the cross-section residual stress of 6 angle steels (including two specimens length and two surface treatment methods) is measured by the shear strain method. The longitudinal residual stress distribution of the specimen section is obtained by experiments, and the distribution curves of angle steel at home and abroad are analyzed, and the model and calculation formula of residual stress distribution are put forward. Secondly, two welded end-plate members of angle steel (including two surface treatments) were measured by blind hole method. The welding residual stress distribution of the specimen was obtained, and the model of welding residual stress distribution along the position of angle steel limb was obtained. The calculation formula is also put forward. Thirdly, the axial compression model of angle steel considering geometric initial defects and residual stress distribution of section is established by using Abaqus, a universal finite element analysis software. The accuracy and reliability of the model are verified by comparing with the experimental data at home and abroad. The parameter analysis is carried out, and finally, the 蠄-位 畏 column curves of hot-rolled and galvanized angle steel axial compression members are calculated and compared with the existing design curves of our country and European and American codes, and the selection of the existing curves of the codes is suggested. An appropriate column curve, calculation formula and design method for the hot-rolled and galvanized angle steel members are presented.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU391
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