May 2015, № 5 (180)

Kolokolov S.B. METHOD OF CHOICE OF STEEL ARCH CROSS SECTION WITH DEFORMATIONAL CALCULATIONThe article is dedicated to the problem of arch constructions engineering. Currently it is common to use both static-based calculation and critical value of strain parameter while calculating the cross section of a steel arch. Based on numerical analysis of arch deformations (with different shapes and different strain) the author of this article proves that we can decide on stability of an arch without calculating the critical value of strain parameter. To evaluate the stability of arch it is enough to perform deformation calculation, which is a convergent process for a stable arch and divergent process — for an unstable. This assumption is the base for the proposed method of calculation of a cross section for an arch. The core of proposed method is the following: instead of static calculation we do deformation calculation by successive approximations, which is being continued until the gradient of travel of calculated points is less than pre-assigned value. Once the condition of durability is realized, the taken cross section is approved. In case if the gradient of changes of transference of travel of calculated points monotonously increases during the process of specification, the calculations should be stopped and taken cross section is rejected. Cross section is also to be rejected in case if condition of strength with achieved during the calculation values of internal powers is not fulfilled. The method can be easily used with computer, and the calculation can be performed on-line, when a planner get the information about condition of arch under strained-pressure after each stage of specification. The article presents a numerical example of choice of steel arch with comments. Key words: planning, arch, construction, calculation, method, strain, deformation calculation, stability, strength.

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About this article

Author: Kolokolov S.B.

Year: 2015

Editor-in-chief

Sergey Aleksandrovich
MIROSHNIKOV

© Электронное периодическое издание: ВЕСТНИК ОГУ on-line (VESTNIK OSU on-line), ISSN on-line 1814-6465
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