Email this article WELDING DEFORMATIONS, «SLACK TEMPERATURES» METHOD AND THE STRENGTHENING OF FIXED COLUMNS OF ROOF STEEL TRUSSES
- Authors: Rodionov I.K.1, Rodionov I.I.1
-
Affiliations:
- Togliatti State University, Togliatti
- Issue: No 2-2 (2015)
- Pages: 166-170
- Section: Articles
- URL: https://vektornaukitech.ru/jour/article/view/492
- ID: 492
Cite item
Full Text
Abstract
The strengthening of roof steel trusses is often achieved by the increase of columns section by means of joining of columns elements during welding. The welding heats the sections and develops flexural deformations. For rational strengthening, it is necessary to take into account these effects. In this connection, the authors developed the methods for calculation of welded deflections produced when strengthening by means of increase of sections in fixed columns of roof steel trusses. These methods are based on the method of determination of welding stresses and deformations known as the «slack temperatures» method. It takes into account the main characteristics of strengthening: the existence in the strengthened elements of compression stresses developed in the result of load, several longitudinal welding seams, and section complexity. These methods are based on the idea of thermal power division during the welding of elements depending on their thicknesses. In cases of strengthening by weld facing of each seam, the authors determined the distributions of welding stresses separately from thermal power necessary for strengthened and strengthening elements.
The procedure of calculation of welding stresses resulted from thermal power necessary for strengthening elements is the same as their calculation procedure in the unstressed element. When calculating stresses from thermal power necessary for the base elements, the authors take into account the compression stresses from the load.
The torques and, consequently, the column welding deflections are determined according to the mutual actions of shrinkage forces originated in the strengthened and the strengthening elements.
The obtained technique of calculation became the basis for the proving of welding technologies allowing strengthening of columns of steel angle trusses during any forcing, including the maximum permissible computed values, and considerably (up to 30%) increase the effect from the strengthening (in comparison with the traditional technologies).
About the authors
Igor Konstantinovich Rodionov
Togliatti State University, Togliatti
Author for correspondence.
Email: riktlt@mail.ru
candidate of technical sciences, Associate Professor, assistant professor of the department «Urban Construction and Management»
РоссияIgor Igorevich Rodionov
Togliatti State University, Togliatti
Email: inmylave@mail.ru
buildings maintenance engineer
РоссияReferences
- Desyatov B.I. Issledovanie raboti usilyaemikh pod nagruzkoy elementov svarnikh stalnikh ferm. Avtoref. diss. kand. tekhn. nauk [Study of work of strengthened under the load elements of welded steel trusses]. Moscow, 1969, 24 p.
- Kizinger R. Issledovanie napryazhennogo sostoyaniya rastyanutikh sterzhney metallicheskikh ferm pri ikh usilenii pod nagruzkoy. Avtoref. diss. kand. tekhn. nauk [Study of stressed state of tension members of metal trusses when strengthening them under the load]. Moscow, 1973, 22 p.
- Kolesnikov V.M. Issledovanie raboti nekotorikh stalnikh konstruktsiy i otdelnikh elementov, usilennikh pod nagruzkoy. Avtoref. diss. kand. tekhn. nauk [Study of work of some steel constructions and separate elements strengthened under the load]. Leningrad, 1967, 24 p.
- Rebrov I.S. To the calculation of column systems strengthened under the load. Izvestiya vuzov. Stroitelstvo i arkhitektura, 1979, no. 1, pp. 62–67.
- Rebrov I.S. Rabota szhatikh elementov stalnikh konstruktsiy, usilennikh pod nagruzkoy [Operation of fixed members of steel constructions strengthened under the load]. Leningrad, Stroyizdat publ., 1976, 176 p.
- Rebrov I.S. Usilenie sterzhnevikh metallicheskikh konstruktsiy. Proektirovanie i raschet [Column metal constructions strengthening. Design and calculation]. Leningrad, Stroyizdat publ., 1988, 288 p.
- Beliy G.I. Procedure of detection of strain-stressed and limit stages in the sec-tions of strengthened column elements in general case of loading. Dokladi: Teoreticheskie osnovi stroitelstva. Moscow, Varshava publ., 1998, pp. 103–108.
- Belskiy M.R., Lebedev A.I. Usilenie stalnikh konstruktsiy [Steel structures strengthening]. Kiev, Budivelnik publ., 1981, 120 p.
- Val’ V.N., Gorokhov E.V., Uvarov B.Yu. Usilenie stalnikh konstruktsiy odnoetazhnikh proizvodstvennikh zdaniy pri ikh rekonstruktsii [Strengthening of steel structures of one-storey production buildings during their reconstruction]. Moscow, Stroyizdat publ., 1987, 220 p.
- Ivanov Yu.V. Rekonstruktsiya zdaniy i sooruzheniy: usilenie, vosstanovlenie i remont [Buildings and installations reconstruction: strengthening, restoration and repair]. Moscow, ASV publ., 2012, 312 p.
- Lashchenko M.N. Povishenie nadezhnosti metallicheskikh konstruktsiy zdaniy i sooruzheniy pri rekonstruktsii [Safety improvement of metal structures of buildings and installations during the reconstruction]. Leningrad, Stroyizdat publ., 1987, 135 p.
- Gorev V.V., ed. Metallicheskie konstruktsii. Vol. 2. Konstruktsii zdaniy [Metal structures. V.2. Buildings constructions]. 2nd ed. Moscow, Visshaya shkola publ., 2002, 520 p.
- Kuznetsov V.V., ed. Metallicheskie konstruktsii. Spravochnik proektirovshchika [Metal structures. Design engineer reference book]. Moscow, ASV publ., 1999, vol. 3, 528 p.
- Kudishin Yu.I., ed. Metallicheskie konstruktsii [Metal structures]. 10th ed. Moscow, Akademiya publ., 2007, 688 p.
- Posobie po proektirovaniyu usileniya stalnikh konstruktsiy (k SNiP P-23-81*) [Manual on steel structures strengthening design (to SNiP P-23-81*)]. Moscow, Stroyizdat publ., 1989, 160 p.
- Ignatyeva V.S. “Slack temperatures” method as the basis for research in the field of strain-stress state of welded conjunctions. Metal structures in construction . Trudi MISI im. Kuybisheva, 1979, no. 152, pp. 71–88.
- Ignatyeva V.S. Svarochnie napryazheniya i deformatsii [Welding stresses and deformations]. Moscow, MISI publ., 1981, 68 p.
- Parlashkevich V.S. Welding voltage and deformation of elements of construction metal structures. European Science and Technology: materials of the VI international research and practice conference. Munich, 2013, vol. II, pp. 321–326.
- Aleshin N.P., Chernishov G.G., eds. Svarka. Rezka. Kontrol’ [Welding. Cutting. Control]. Moscow, Mashinostroenie publ., 2004, vol. 1, 480 p.
- Dmitrieva T.L. Methods and algorithms for solving problems of structural mechanics using software. P. 2. Calculation of plane trusses in the program EXCEL, MATHCAD, COMPASS. Vestnik Irkutskogo gosudarstvennogo tekhnicheskogo universiteta, 2014, no. 2, pp. 126–134.
Supplementary files
